Battery Technology Reference · Last reviewed 2026-09-15
| Cathode | Nominal voltage | Character |
|---|---|---|
| LFP (lithium iron phosphate) | ~3.2 V | Safe, long cycle life, lower energy density |
| NMC (nickel-manganese-cobalt) | ~3.7 V | Higher energy density, more expensive |
| NCA (nickel-cobalt-aluminium) | ~3.6 V | High energy, mainly automotive |
The cathode is where the chemistry lives — see LFP vs NMC for the full trade-off. The cathode also determines the cell's thermal stability: LFP holds its oxygen more tightly, which is why it is safer than NMC.
The anode stores lithium ions during charge and releases them during discharge. Graphite is the standard because it is cheap, stable and well-understood. Silicon stores far more lithium per gram (raising energy density) but swells dramatically on charge, which shortens life — so it is used as an additive to graphite rather than alone. LTO (lithium titanate) is a niche anode for ultra-fast charge and extreme cycle life.
The cathode is the biggest lever on a lithium cell because it sets the voltage, the energy density and the safety behaviour. Two cells with the same graphite anode but different cathodes (LFP vs NMC) are different batteries — different voltage, capacity, cost and fire behaviour. The anode matters for cycle life and fast-charge capability, but the cathode defines the cell.
Position: When people compare "lithium batteries," they are really comparing cathodes — and the anode, usually identical graphite, is the quiet partner that decides how long and how fast the cell can be cycled.
Reasoning: The cathode sets the headline numbers (voltage, energy, safety); the anode sets the durability and charge-rate limits. Understanding both is the difference between reading a spec sheet and understanding why two cells behave differently.
This is the author's editorial view, not a purchasing guarantee.
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