Battery Chemistries — Family Index

1. At a glance

A battery is an electrochemical cell (or stack) that converts stored chemical energy to electrical energy via redox at two electrodes separated by an ion-conducting electrolyte. Two top-level partitions:

• Primary cells — single discharge, not designed for recharge. Sealed, long shelf life, optimized for energy density and self-discharge. Alkaline AA, CR2032 coin, Li-SOCl₂ industrial.
• Secondary cells — rechargeable via reverse current. Optimized for cycle life, round-trip efficiency, and rate capability in addition to energy density. Li-ion EV, lead-acid SLI, NiMH hybrid, redox flow grid.

Every chemistry trades along five performance axes:

Axis	Unit	What it sets
Gravimetric energy density	Wh/kg	Range of mobile applications; pack mass
Volumetric energy density	Wh/L	Cell-pack volume; phone/laptop fit
Power density	W/kg	Peak discharge rate (C-rate), fast charge
Cycle life	cycles to 80% capacity	Calendar economics; ESS / EV residual value
Safety	thermal-runaway threshold, abuse tolerance	BMS complexity, transport class, insurance
Cost	$/kWh installed	Mass-market viability

A chemistry rarely wins on all five. LFP trades energy density for cycle life and safety. NCA / NMC 811 trade safety and cycle life for energy density. LTO trades nominal voltage and cost for extreme cycle life and rate. Lead-acid trades everything for cheap upfront $/kWh.

2. Property cheat sheet

Chemistry	Type	Nominal V	Wh/kg	Wh/L	Cycle life	Typical use
LCO (LiCoO₂)	Li-ion sec	3.7	150-200	400-550	500-1000	Phones, laptops (legacy)
NMC 111	Li-ion sec	3.7	150-220	450-580	1000-2000	EV early, power tools
NMC 532	Li-ion sec	3.7	200-240	500-620	1500-2500	EV (VW MEB, GM Bolt)
NMC 622	Li-ion sec	3.7	220-260	550-650	1500-2500	EV (BMW, VW)
NMC 811	Li-ion sec	3.7	250-280	600-700	1000-2000	EV premium (Mercedes EQS, Lucid)
NCA	Li-ion sec	3.6	230-260	600-700	500-1500	Tesla 18650/2170 (Panasonic)
LFP (LiFePO₄)	Li-ion sec	3.2	90-160	220-330	3000-6000	EV mass (BYD Blade, Tesla SR), ESS
LMFP	Li-ion sec	3.7	180-210	380-450	2000-4000	Emerging EV (CATL M3P, Gotion)
LMO (LiMn₂O₄)	Li-ion sec	3.7	100-140	250-350	300-700	Nissan Leaf early, power tools
LTO (Li₄Ti₅O₁₂)	Li-ion sec	2.4	60-90	130-200	20000+	Toshiba SCiB, transit bus
NMC + Si-anode	Li-ion sec	3.7	280-330	700-820	800-1500	Tesla 4680, premium EV 2025+
Solid-state Li sulfide	Li-ion sec	3.7-4.2	350-450 (target)	800-1000	500-1000 (lab)	Pre-prod 2026-2028
NiMH	aq sec	1.2	60-120	140-300	500-1000	Prius hybrid (gen 1-3), AA NiMH
NiCd	aq sec	1.2	40-60	50-150	1000-2000	Aviation backup, industrial (legacy)
NiZn	aq sec	1.6	80-100	170-280	300-500	Niche ESS, partner Eos
Lead-acid (flooded SLI)	aq sec	2.0	30-40	60-90	100-300	12 V auto start, golf cart
Lead-acid (AGM/VRLA)	aq sec	2.0	35-50	75-110	300-700	UPS, stop-start auto, marine
Lead-acid (deep cycle)	aq sec	2.0	30-50	60-100	500-1500	RV, solar, forklift
Na-ion	sec	3.0-3.2	120-160	250-380	2000-4000	CATL gen-1 ESS/entry-EV, BYD
Vanadium redox flow (VRFB)	sec flow	1.26-1.4	15-30	20-40	15000+	Long-duration grid ESS
Zn-Br flow	sec flow	1.8	60-80	40-70	2000-5000	Mid-duration grid
Iron-air (Form Energy)	sec	1.2	100 (system)	n/a	1000-5000	100-hr grid ESS
Zn-air rechargeable	sec	1.4	200-300 (target)	n/a	200-500	Stationary prototype
Alkaline (Zn-MnO₂)	primary	1.5	80-150	250-400	1	AA, AAA, 9 V consumer
Carbon-zinc (Leclanché)	primary	1.5	50-80	100-200	1	Cheap remotes, clocks
Li-MnO₂	primary	3.0	200-280	500-650	1	CR123A, CR2032, smoke alarm
Li-SOCl₂	primary	3.6	400-700	900-1200	1	Industrial meters (10-20 yr)
Li-CFx	primary	3.0	600-700	1000	1	Implantable medical, defense
Li-SO₂	primary	2.95	250-340	400-500	1	Military radio
Silver-oxide (Ag-Zn)	primary	1.55	130-150	500	1	Watch button, short-mission mil
Zn-air primary	primary	1.4	300-450	1000-1200	1	Hearing-aid PR cells

3. Lithium-ion families (secondary)

All Li-ion variants share the same operating principle: Li⁺ shuttles between a lithiated transition-metal oxide cathode and a graphite (or Si-doped, or LTO) anode through a non-aqueous electrolyte (LiPF₆ in EC/DMC/DEC carbonate blend with VC/FEC additives). The cathode chemistry sets nearly every cell-level metric.

3.1 LCO — LiCoO₂

• Nominal V: 3.7 V; max 4.2 V; min 3.0 V.
• Energy: 150-200 Wh/kg, 400-550 Wh/L (best volumetric of common cathodes).
• Origin: Sony commercialized 1991 (first commercial Li-ion); Goodenough discovered LiCoO₂ at Oxford 1980.
• Use: Smartphones, laptops, tablets (mostly displaced by NMC 2018+ even in handhelds for cost/safety).
• Decline: Cobalt cost (DRC supply, ethics), thermal-runaway threshold ~150 °C (lowest of Li-ion family). Banned from EV traction.

3.2 NMC — LiNi_xMn_yCo_zO₂

NMC’s stoichiometric ratio is set by the three integers, normalized to 10. Higher Ni → higher capacity but lower thermal stability and faster Co/Ni dissolution.

Variant	Ni	Mn	Co	Capacity mAh/g	Notes
NMC 111	33%	33%	33%	150-160	First generation EV; balanced
NMC 442	40%	40%	20%	160-170	Transitional
NMC 532	50%	30%	20%	170-180	VW MEB Gen 1, GM Bolt
NMC 622	60%	20%	20%	180-200	BMW i3 face, VW ID.4
NMC 811	80%	10%	10%	200-220	Mercedes EQS, Lucid Air; Co cut to 11%
NMC 9·0.5·0.5	90%	5%	5%	220-230	LG / SK On 2024+ for premium
NMCA	89% Ni / 4-9% Co / 4% Al + Mn	n/a	LG for GM Ultium

• Energy density progression: 220 Wh/kg (532) → 250 Wh/kg (622) → 280 Wh/kg (811) → 300+ Wh/kg (90·5·5 + Si-anode).
• Manufacturers: LG Energy Solution, Samsung SDI, SK On, CATL, BYD, Envision AESC, Panasonic.
• Trade: Higher Ni → higher capacity, higher cost-of-volatility (Ni 2022 LME spike), lower thermal-runaway onset (~210 °C for NMC 111 → ~150 °C for NMC 811), more aggressive BMS thermal management needed.

3.3 NCA — LiNi_{0.8}Co_{0.15}Al_{0.05}O₂

• Nominal V: 3.6 V; max 4.2 V.
• Energy: 230-260 Wh/kg; ~250 Wh/kg typical 21700 cell.
• Use: Tesla’s exclusive cathode for 18650 (Model S/X early) and 21700 (Model 3 LR / Model Y), supplied by Panasonic Gigafactory Nevada. Saft for industrial.
• Why Al not Mn: Al³⁺ stabilizes the layered structure without consuming redox capacity; better thermal stability than pure LNO.
• Cycle life: 500-1500 cycles to 80% — lower than LFP/NMC because high Ni accelerates SEI growth.

3.4 LFP — LiFePO₄

• Nominal V: 3.2 V (a full 0.4-0.5 V lower than NMC, so packs need more cells in series for same voltage).
• Energy: 90-160 Wh/kg cell-level, 130-180 Wh/kg pack-level after CTP (cell-to-pack) engineering — BYD Blade and CATL Qilin remove the module level entirely.
• Cycle life: 3000-6000 cycles to 80% DoD; calendar life 15+ yr at moderate T.
• Safety: No thermal runaway under standard abuse (nail, crush, overcharge); decomposition is endothermic and releases no O₂ from the cathode. Passes UL 9540A burn-through tests cleanly.
• Cost: Iron + phosphate are abundant; no Co, no Ni. ~$80-90/kWhcell2025vs$100-110 for NMC.
• Adoption since 2020: Tesla Model 3 SR (CATL 2020 onward), BYD Blade (entire BYD EV lineup), Ford F-150 Lightning standard range, GM equinox EV, virtually all stationary ESS (Tesla Megapack v3, CATL EnerC, Sungrow PowerStack).
• Limitation: Low-T capacity drop (~70% at -10 °C without preheat); flat discharge curve makes SoC estimation hard (BMS uses coulomb counting + occasional CV stabilization).

3.5 LMO — LiMn₂O₄ (spinel)

• Nominal V: 3.7 V; 100-140 Wh/kg.
• Use: Nissan Leaf (2010-2012 gen 1), power tools, early hybrid packs. Often blended with NMC (“LMO/NMC blend”) to boost rate capability while keeping energy density.
• Why declining: Mn dissolves into electrolyte at elevated T (>50 °C), eroding cycle life.

3.6 LTO — Li₄Ti₅O₁₂ (anode, not cathode)

LTO is an anode material (replaces graphite) paired with NMC or LMO cathode. The other Li-ion chemistries here are named by cathode.

• Nominal V: 2.4 V (lower than graphite-anode Li-ion because Ti⁴⁺/Ti³⁺ redox sits higher vs Li/Li⁺).
• Energy: 60-90 Wh/kg — penalty for the low V.
• Why use it: 5C-10C continuous charge (10-15 min full charge), 20000+ cycles, no SEI growth (Ti redox is above Li plating potential, so no lithium dendrites), safe to -30 °C.
• Manufacturers: Toshiba SCiB, AltairNano (US), Microvast.
• Use: Transit buses (Proterra original, Yutong, BYD K-series early), industrial forklifts, fast-charge stationary buffer, frequency-regulation grid.

3.7 High-Ni NMC + silicon-anode

Current frontier (2024-2026): NMC 90·5·5 cathode + 5-15% Si in graphite anode (Si-graphite blend) to push gravimetric energy 280-330 Wh/kg.

• Tesla 4680 (2022+) — 24-25 Ah cylindrical, NCA + Si-blend anode, dry electrode process, 7-10% Si.
• Sila Nanotechnologies (Mercedes-Benz G-Class EV 2024+) — 100% Si nano-composite anode replacing graphite.
• Group14, Enovix, Amprius — high-Si anode suppliers for premium and aerospace.
• Challenge: Si swells 300% on lithiation; SEI fractures and re-forms each cycle, consuming Li inventory; cycle life 800-1500 vs 2000+ for plain graphite.

3.8 LMFP / LFMP — Mn-substituted LFP

LiMn_yFe_{1-y}PO₄ with y ~ 0.5-0.7. Adds a 4.0 V Mn²⁺/Mn³⁺ plateau on top of LFP’s 3.4 V Fe²⁺/Fe³⁺ plateau, raising average voltage to ~3.7 V and energy density to 180-210 Wh/kg.

• CATL M3P (2023+), Gotion Astroinno (2024).
• Used in mid-tier EV (Geely Galaxy E5, MG ZS EV).

4. Solid-state Li (pre-production)

Solid-state replaces the liquid carbonate electrolyte with a solid ion conductor and enables a Li-metal anode (10× the gravimetric capacity of graphite). Three electrolyte families:

Family	Examples	σ at 25 °C (mS/cm)	Status
Sulfide	Li₃PS₄, Li₆PS₅Cl (argyrodite), Li₁₀GeP₂S₁₂ (LGPS)	1-25	Toyota (2027-2028 production target), Samsung SDI pilot, Solid Power
Oxide	LLZO (Li₇La₃Zr₂O₁₂), LATP, LISICON	0.1-1	QuantumScape (anodeless), ProLogium (CN/TW)
Polymer / polymer-gel	PEO + LiTFSI	0.01-0.1 (needs 60-80 °C)	Blue Solutions (Bolloré) — used in Mercedes/Daimler eCitaro bus

Targets: 350-450 Wh/kg cell, 800-1000 Wh/L. Production timeline for mass-market EV: 2027-2030 realistic per Toyota, BMW, Hyundai roadmaps as of early 2026.

5. Other secondary chemistries

5.1 NiMH — Nickel-Metal Hydride

• Cell V: 1.2 V; alkaline KOH electrolyte; cathode = NiOOH; anode = AB₅ or AB₂ rare-earth hydride alloy (LaNi₅-class).
• Energy: 60-120 Wh/kg; 140-300 Wh/L.
• Use: Toyota Prius generations 1-3 (1997-2015) used NiMH (Panasonic + Sanyo + later Primearth EV Energy joint venture); rechargeable AA (Eneloop, Energizer).
• Why hybrids stayed on it: Safer than Li-ion under abuse, deep cycle tolerant, no thermal-runaway, manageable at the smaller pack size (1.3 kWh Prius vs 60 kWh BEV). Toyota switched bZ4X and newer hybrids to Li after 2020 for cost-parity.

5.2 NiCd — Nickel-Cadmium

• Cell V: 1.2 V; KOH electrolyte; Cd anode is the toxic + restricted component.
• Energy: 40-60 Wh/kg.
• Pros: Wide temperature range (-40 to +60 °C), abuse tolerant, 1000-2000 cycles, ultra-low impedance for high-rate.
• Cons: “Memory effect” (voltage depression after shallow cycling — really a crystal-growth issue), Cd toxicity → consumer ban under EU Directive 2006/66/EC (allowed for emergency lighting, medical, industrial, aviation).
• Use 2026: Aircraft backup (Saft, GAF), industrial standby, rail signaling.

5.3 Lead-acid

The oldest commercial rechargeable (Planté 1859, Faure 1881). Still ~50% of installed kWh worldwide by chemistry due to SLI ubiquity.

• Cell V: 2.0 V (six cells in series → 12 V auto).
• Chemistry: Pb anode + PbO₂ cathode + H₂SO₄ electrolyte. Discharge: Pb + PbO₂ + 2 H₂SO₄ → 2 PbSO₄ + 2 H₂O.
• Variants:
  • Flooded SLI — auto starter, lowest cost ($0.10-0.15/Wh), 100-300 cycles, requires venting.
  • VRLA (Valve-Regulated Lead-Acid) — sealed; two sub-types:
    • AGM (Absorbent Glass Mat) — electrolyte held in glass mat; stop-start auto, marine, motorcycle, UPS.
    • GEL — silica-thickened H₂SO₄; deep-cycle off-grid, mobility scooter.
  • Deep-cycle flooded — thicker plates, 500-1500 cycles at 50% DoD; RV, golf cart, off-grid solar, forklift traction.
• Energy: 30-50 Wh/kg; 60-110 Wh/L.
• Manufacturers: Clarios (Johnson Controls + Brookfield), East Penn (Deka), EnerSys, Exide, GS Yuasa, Trojan.

5.4 Sodium-ion (Na-ion)

Layered oxide or polyanion cathode (Na_xNi_yMn_zFe_wO₂, NaFePO₄F, Prussian blue analog Na_xMnFe(CN)₆) + hard-carbon anode + NaPF₆ in carbonate electrolyte. Identical roll-to-roll manufacturing to Li-ion, drop-in for existing gigafactories.

• Cell V: 3.0-3.2 V; 120-160 Wh/kg.
• Pros: No Li, no Ni, no Co (cathode uses Fe + Mn + Cu); abundant Na (seawater); Al current collector at both electrodes (Cu not needed since Na doesn’t alloy with Al); ships at 0 V (safer transport, UN ADR exempt potentially); excellent low-T performance (-30 °C capacity 90%).
• Cons: ~25-30% lower Wh/kg than LFP; energy density still improving.
• Manufacturers: CATL (gen-1 commercial 2023, gen-2 2025), BYD, HiNa Battery (CN), Faradion (UK, acquired by Reliance Industries 2022), Northvolt, Natron Energy (Prussian-blue power-cell variant).
• Target apps: Grid ESS, entry-level EV (Sehol EX10 Sea Lion 2023, BYD Seagull Na-ion variant), 2W/3W vehicles, telecom backup.

5.5 NiZn — Nickel-Zinc

• Cell V: 1.6 V (highest of aqueous secondary).
• Energy: 80-100 Wh/kg.
• Issue: Zn dendrites limit cycle life historically; modern additives + flow configurations push 300-500 cycles.
• Use: Eos Energy Znyth (proprietary aqueous Zn), some BYD partnerships. Niche grid storage.

5.6 Redox flow

Electrolyte is the energy storage; pumps circulate it through an external power-conversion stack. Power (stack size) and energy (tank size) decouple — economic for long-duration (>4 hr) storage.

Type	Catholyte / anolyte	V	Notes
VRFB	V⁵⁺/V⁴⁺ / V³⁺/V²⁺ in H₂SO₄	1.26-1.4	Sumitomo SEI, Invinity, CellCube; 20+ yr life
Zn-Br	Br⁻/Br₂ / Zn²⁺/Zn	1.8	Redflow ZBM, Primus Power
Iron-flow	Fe³⁺/Fe²⁺ / Fe²⁺/Fe⁰	1.21	ESS Inc. Energy Warehouse (12 hr)
Iron-air (not strictly flow)	Air cathode / Fe anode	1.28	Form Energy 100-hr ESS; reversible iron rusting
Zn-air rechargeable	Air / Zn	1.4	NantEnergy, ZAF Energy; bifunctional air catalyst challenge

6. Primary chemistries

6.1 Alkaline (Zn-MnO₂)

• Cell V: 1.5 V; 80-150 Wh/kg.
• Reaction: Zn + 2 MnO₂ + H₂O → ZnO + 2 MnOOH (KOH alkaline electrolyte vs NH₄Cl in carbon-zinc).
• Form factors: AAA (LR03), AA (LR6), C (LR14), D (LR20), 9 V (6LR61).
• Brands: Duracell (Procter & Gamble), Energizer, Panasonic Evolta, Varta.
• Shelf life: 5-10 yr at room T.

6.2 Carbon-zinc (Leclanché, “heavy duty”)

• Zn / NH₄Cl + ZnCl₂ / MnO₂. 1.5 V, 50-80 Wh/kg.
• Cheap, lower capacity than alkaline, worse leakage. Largely displaced in developed markets; common in low-drain devices and emerging markets.

6.3 Lithium primary

Subtype	V	Wh/kg	Form	Use
Li-MnO₂	3.0	200-280	CR123A camera, CR2032 coin, 9 V Ultimate Lithium	Smoke alarms, key fobs, motherboard CMOS, smoke detectors (10-yr)
Li-SOCl₂ (thionyl chloride)	3.6	400-700	D-cell bobbin, AA wound	Tadiran TL series, Saft LS — water/gas meters, pipeline sensors, military, 10-25 yr field life
Li-SO₂ (sulfur dioxide)	2.95	250-340	D, BA-5590 military	US Army radios, harsh-cold operations (-55 °C)
Li-CFx (carbon monofluoride)	3.0	600-700	Coin, prismatic	Implantable medical, defense; highest specific energy of any primary
Li-FeS₂	1.5	200-300	AA “Energizer Ultimate Lithium”	Drop-in for alkaline AA; 1.5 V compatible
Li-I₂ (solid electrolyte)	2.8	230	Pacemaker	Cardiac pacemakers; self-healing solid-state

6.4 Silver-oxide (Ag-Zn)

• Cell V: 1.55 V; 130-150 Wh/kg.
• Use: Watch button cells (SR-series — SR626, SR621), hearing aids historically, short-mission military (torpedoes, submarines — high power Ag-Zn).

6.5 Zinc-air primary

• Zn anode + air cathode (O₂ catalyzed on porous carbon).
• 1.4 V; 300-450 Wh/kg — highest practical primary by mass.
• Once seal tab is pulled, air enters and shelf life drops from 5 yr to ~3 months.
• Use: PR41, PR44, PR48, PR70 hearing-aid cells; orange-tabbed Duracell ActivAir / Rayovac.

7. Form factors

Form	Dimensions	Capacity (Li-ion)	Typical chemistry / use
18650 cylindrical	18.0 × 65.0 mm	2500-3500 mAh @ 3.6 V	NMC/NCA — laptop, vape, power tool, Tesla Model S original
21700 / 2170	21.0 × 70.0 mm	4800-5000 mAh @ 3.6 V	NCA — Tesla Model 3/Y, e-bike, Rivian
4680	46.0 × 80.0 mm	24-25 Ah @ 3.6 V	NCA + Si — Tesla 2022+, BMW Gen 6 (2025+)
32650 / 33140	32-33 × 140 mm	6-15 Ah	LFP — ESS, e-mobility
Pouch (laminated foil)	varies	5-100+ Ah	NMC pouch — LG, SK On EV; phone, drone
Prismatic hard-case	varies	50-350 Ah	LFP — CATL, BYD Blade, EVE; large EV, ESS
Coin (button) CR2032	20.0 × 3.2 mm	230 mAh @ 3 V	Li-MnO₂ — motherboard, key fob
Coin CR2025	20.0 × 2.5 mm	165 mAh	Slim devices
Coin CR1620	16.0 × 2.0 mm	75 mAh	Smaller fobs
AA / R6	14.5 × 50.5 mm	1800-3500 mAh (alkaline-eq.)	Alkaline, NiMH, Li-FeS₂
AAA / R03	10.5 × 44.5 mm	800-1200 mAh	Same as AA
9 V / 6LR61	26.5 × 17.5 × 48.5 mm	500-650 mAh	Alkaline, NiMH, Li-MnO₂
D / R20	34.2 × 61.5 mm	14000-18000 mAh	Flashlights, large devices

7.1 Cylinder vs pouch vs prismatic at pack level

• Cylindrical — best cell-level mechanical robustness and uniform compression; lowest pack-level volumetric efficiency (gaps between rounds); easiest to thermally manage (coolant tube/ribbon between cells). Tesla pioneered cylindrical-only EV pack.
• Pouch — highest cell-level Wh/L, but requires external compression frame and stiff module. Used by LG, SK On, Samsung SDI for EV. Risk: pouch swelling on cycle life; sensitive to cell-balance.
• Prismatic hard-case — rigid aluminum can, supports cell-to-pack (CTP) and cell-to-body (CTB) designs (CATL Qilin, BYD Blade) that delete module-level enclosures and push pack volumetric energy 250-300 Wh/L. Dominant for LFP EV.

8. Lithium-ion cell specs (round-cell)

Cell	Dimensions (mm)	Chemistry typical	Capacity (Ah)	Energy (Wh)
18650 (standard)	18 × 65	NMC, NCA	2.5-3.5	9-12.6
18650 (high power)	18 × 65	LMO, NMC blend	1.5-2.0	5.4-7.2
21700	21 × 70	NCA	4.8-5.0	17-18
4680	46 × 80	NCA + Si	24-25	86-90
32650	32 × 65	LFP	5-7	16-22
33140	33 × 140	LFP	14-15	45-48

Cylinder energy-density advantage at pack level: low (cylinder packing ~91% in hexagonal close-pack, with cooling channels reducing further). Prismatic + pouch achieve >95% pack efficiency but demand stricter compression / swell management and cell-level BMS attention.

9. Safety / failure modes

9.1 Li-ion thermal runaway

A four-stage exotherm:

1. SEI breakdown (~80-120 °C) — solid-electrolyte interphase decomposes, exposing graphite to electrolyte.
2. Separator melt (PE ~130 °C, PP ~165 °C, ceramic-coated higher) — internal short circuit; Joule heating spikes.
3. Cathode decomposition (LCO ~150 °C, NMC 811 ~150 °C, NMC 111 ~210 °C, LFP >270 °C and endothermic) — releases O₂ from layered oxide which combusts electrolyte.
4. Anode + electrolyte exotherm — Li-graphite reacts with carbonate at ~200 °C; total cell can reach 800-1000 °C and propagate to neighbors.

Triggers: overcharge (Li plating + dendrite), over-discharge (Cu shuttle), external short, mechanical crush (separator pierce), internal manufacturing defect (metal-particle inclusion), low-T fast charge (dendrite penetration).

9.2 Protective measures

• BMS (Battery Management System): per-cell voltage monitoring (typ ±5 mV), pack current, multi-zone T sensors, charge/discharge MOSFET cut-off, cell-balancing (passive resistor or active inductive), state-of-charge + state-of-health estimation, communication bus (CAN-FD for EV, RS-485 / Modbus for ESS).
• Cell-level: CID (Current Interrupt Device), PTC (positive temperature coefficient resistor), vent membrane, ceramic-coated separator (Celgard, Toray), shutdown separator (multilayer PE/PP/PE that melts the PE first to close pores).
• Pack-level: pyro-fuse (Megafuse, MERSEN), pyro-disconnect, intumescent insulation, thermal barriers between cells (mica, aerogel), water-glycol cooling (Tesla, Audi e-tron) or immersion cooling (Mahle, Castrol).

9.3 Standards / transport

Standard	Scope
UL 1642	Cell safety
UL 2054	Battery pack safety
IEC 62133-2	Sealed secondary cells/batteries portable
UN 38.3	Transport tests (8 sub-tests: T1-T8) — required for shipment
UN ADR / IATA DGR Class 9	Hazmat transport class for Li batteries
ISO 6469 / ECE R100	EV battery safety
SAE J2464 / J2929	EV abuse testing
UL 9540 / 9540A	ESS safety + fire propagation

High-Ni NMC 811 + Si-anode push thermal-runaway onset lower and increase O₂ release — newer cells demand cell-to-cell propagation prevention, not just per-cell control.

10. EV chemistry cheat sheet (2026)

Vehicle / platform	Pack chemistry	Cell supplier	Format
Tesla Model 3 SR / Y SR	LFP	CATL	Prismatic
Tesla Model 3 LR / Y LR	NCA	Panasonic	2170 cylindrical
Tesla 4680 (Cybertruck, S/X refresh)	NCA + Si	Tesla in-house + Panasonic	4680 cylindrical
BYD all models	LFP (Blade)	BYD in-house	Prismatic CTP
Mercedes EQS / EQE	NMC 811	LG Energy Solution	Pouch
VW MEB (ID.3/4/7)	NMC 622	LG, SK On, CATL	Pouch + prismatic
Audi e-tron GT / Porsche Taycan	NMC 622	LG	Pouch
BMW iX / i4 (Gen 5)	NMC 811	CATL, Samsung SDI	Prismatic
BMW Neue Klasse (Gen 6, 2025+)	NMC + LFP variants	CATL, EVE, ACC	4680 cylindrical
GM Ultium (Bolt EUV, Lyriq, Silverado EV)	NMCA	LG, Ultium Cells	Pouch large
Ford Mustang Mach-E / F-150 Lightning	NMC + LFP SR	LG, SK On, CATL	Pouch + prismatic
Lucid Air	NMC 811	Samsung SDI	21700 cylindrical
Rivian R1T/R1S	NMC	Samsung SDI	21700 cylindrical
Hyundai Ioniq 5/6, Kia EV6	NMC 622	SK On, LG	Pouch
Nissan Ariya	NMC	AESC, CATL	Pouch
Toyota bZ4X	NMC + LFP variants	CATL, BYD, Panasonic	Mixed
Toyota Prius (HEV)	NiMH gen 1-3, Li-ion gen 4-5	Panasonic/Primearth	Prismatic

11. Cycle life trade table

Chemistry	Cycles to 80% (typical)	DoD assumed	Notes
LFP	3000-6000	80%	Best of mainstream Li-ion
LMFP	2000-4000	80%	Mn shuttle limits
NMC 532 / 622	1500-2500	80%	Mass EV
NMC 811	1000-2000	80%	Premium EV
NCA	500-1500	80%	Tesla
LCO	500-1000	80%	Phone/laptop
LTO	20000+	100% (rated DoD)	Transit bus, grid FFR
Si-anode NMC	800-1500	80%	Premium 2024+
Lead-acid flooded SLI	100-300	50%	Auto starter
Lead-acid AGM/VRLA	300-700	50%	UPS, stop-start
Lead-acid deep cycle	500-1500	50%	RV/solar/forklift
NiMH	500-1000	80%	Prius, Eneloop
NiCd	1000-2000	80%	Aviation backup
Vanadium redox flow	15000+	100%	Grid (electrolyte indefinite)
Iron-air	1000-5000	100%	100-hr grid
Sodium-ion	2000-4000	80%	CATL gen-1/2

12. Charge curves (CCCV)

Standard Li-ion charge: CCCV = Constant Current then Constant Voltage.

1. CC phase — current at C/2 to 1C until cell hits V_max.
2. CV phase — voltage held at V_max, current tapers exponentially.
3. Termination — when I drops below I_term (typically C/10 to C/20). Cell is ~99% full.

Chemistry	V_max per cell	V_min per cell	Float V
LCO	4.20	3.0	4.20
NMC (std)	4.20	3.0	4.15-4.20
NMC (high V)	4.35	3.0	4.30
NCA	4.20	3.0	4.15
LFP	3.65	2.5	3.40-3.45
LTO	2.85	1.8	2.65
Lead-acid	14.4-14.7 V (12V pack)	10.5 V	13.5-13.8 V
NiMH	1.45-1.50	1.0	n/a (use −ΔV detection)

Fast charging: stepped CV (Tesla V3/V4 Supercharger 250-350 kW), Porsche Taycan 800 V architecture 270 kW; current 4C peak on 4680 NCA, 3C on LFP prismatic with active liquid cooling; preheat below 10 °C to avoid Li plating.

13. Selection heuristics

Application	Recommended chemistry
Smartphone, tablet	NMC or LCO pouch
Laptop	NMC 18650 / pouch
Cordless tool 18-40 V	High-power NMC 18650/21700
Drone (consumer)	NMC pouch high-C
Drone (industrial / VTOL)	NMC + Si-anode pouch
E-bike, e-scooter	NMC 18650/21700
Mass-market EV (short-medium range)	LFP prismatic CTP
Premium EV (long range, fast charge)	NMC 811 / NCA pouch or 4680 + Si
PHEV	High-power NMC pouch
Transit bus, fast-charge fleet	LTO or LFP with high C-rate cooling
Heavy truck (Class 8)	LFP large prismatic (Tesla Semi, BYD)
Home ESS (residential solar)	LFP (Tesla Powerwall 3, Enphase, BYD)
Utility-scale ESS (1-4 hr)	LFP prismatic
Utility-scale ESS (4-10 hr)	LFP or Na-ion
Long-duration ESS (10-100 hr)	Iron-flow, iron-air, vanadium redox
Grid frequency regulation (sec-min)	LTO or Li-ion + flywheel hybrid
UPS data center	LFP (replacing VRLA 2020+)
Car starter (SLI)	Lead-acid flooded or AGM
Stop-start auto	Lead-acid AGM
Forklift traction	Lead-acid deep cycle or LFP
Off-grid solar (small)	Lead-acid AGM or LFP
Hearing aid	Zn-air primary (PR41/44/48)
Watch	Silver-oxide button (SR626/SR621)
Remote control, clock	Alkaline AA/AAA
Smoke alarm (10-yr)	Li-MnO₂
Pacemaker	Li-I₂
Implantable defibrillator	Li-CFx hybrid
Pipeline / water meter (10-25 yr)	Li-SOCl₂ bobbin
Aviation backup	NiCd or Li-ion (CMR-certified)
Military radio (cold ops)	Li-SO₂ BA-5590

14. Cell manufacturers (2026)

Company	HQ	Notable products	2025 share approx
CATL	Ningde, CN	NMC, LFP, Qilin CTP, M3P LMFP, Shenxing 4C-LFP, Naxtra Na-ion	~37% global EV cells
BYD	Shenzhen, CN	Blade LFP prismatic, vertically integrated EV	~17%
LG Energy Solution	Seoul, KR	NMC pouch + 4680 cylindrical	~12%
Panasonic	Osaka, JP	NCA 18650/2170/4680 (Tesla)	~5-6%
Samsung SDI	Yongin, KR	NMC pouch, 21700, prismatic, P5/P6	~5%
SK On	Seoul, KR	NMC pouch (VW, Ford, Hyundai)	~5%
Tesla	Sparks NV / Berlin / Austin	4680 NCA + Si in-house	growing
CALB	Luoyang, CN	LFP, NMC prismatic	~4%
EVE Energy	Huizhou, CN	LFP prismatic, 46xx cylindrical	~3%
Sunwoda	Shenzhen, CN	LFP, NMC	~2%
Gotion High-Tech	Hefei, CN	LFP, LMFP Astroinno	~3%
Northvolt	Skellefteå, SE	NMC pouch + Na-ion (financial restructuring 2024-2025)	<1%
Verkor	Dunkirk, FR	NMC pouch (Renault)	<1% pre-prod
ACC	Douvrin, FR / DE	NMC pouch (Stellantis, Mercedes)	<1% pre-prod
Envision AESC	Yokohama JP / Wuxi CN / Sunderland UK	NMC pouch (Nissan, Renault, Mercedes)	~2%
PowerCo	Salzgitter, DE	VW’s in-house cell unit (NMC + LFP, partner with Northvolt before unwind)	pre-prod
Microvast	Stafford TX / Huzhou CN	NMC + LTO (commercial vehicle)	small
Toshiba	Tokyo, JP	SCiB LTO	niche
Saft (TotalEnergies)	Bordeaux, FR	NCA aerospace, Li-SOCl₂ industrial	niche premium
Tadiran	Israel	Li-SOCl₂ industrial primary	dominant industrial primary

15. Cross-references

• [[Engineering/power-electronics]] — converters, chargers, inverters that mate to cell packs.
• [[Engineering/Tier3/electric-motor-taxonomy]] — motors driven by traction packs.
• [[Robotics/power-systems]] — robot battery pack design.
• [[Engineering/ic-engines]] — counterpart for combustion; hybrid pairings.
• [[Engineering/Tier3/semiconductor-materials]] — Si, SiC, GaN for BMS + charger power stage.

16. Citations

• Linden, D. & Reddy, T. B. (eds.), “Linden’s Handbook of Batteries”, 4th edition, McGraw-Hill, 2011.
• Battery University (Cadex Electronics) — https://www.batteryuniversity.com/
• IEC 62133-2:2017 — Secondary cells and batteries containing alkaline or other non-acid electrolytes — Safety requirements for portable sealed secondary lithium cells.
• UN Manual of Tests and Criteria, Part III, Section 38.3 — Transport tests for lithium metal and lithium ion batteries.
• UL 1642 — Standard for Lithium Batteries.
• UL 9540 / 9540A — Energy Storage Systems and Equipment / Test Method for Fire Propagation.
• Goodenough, J. B., Nobel Lecture in Chemistry 2019 — “Designing Cathode Materials for Lithium-Ion Batteries.”
• Whittingham, M. S., Nobel Lecture 2019 — Intercalation chemistry origins.
• Yoshino, A., Nobel Lecture 2019 — Commercial Li-ion development at Asahi Kasei / Sony.
• IEC TC 21 / SC 21A — Secondary cells and batteries containing alkaline or other non-acid electrolytes.
• IEC TC 35 — Primary cells and batteries.
• Tarascon, J.-M. & Armand, M., “Issues and challenges facing rechargeable lithium batteries”, Nature 414 (2001) 359.
• Manthiram, A., “A reflection on lithium-ion battery cathode chemistry”, Nature Communications 11 (2020) 1550.