LFP

Lithium-iron-phosphate is a cathode material used in rechargeable lithium-ion cells. The chemical compound LiFePO₄ forms the positive electrode; when paired with a graphite anode and organic electrolyte, it creates a cell with distinct performance characteristics that have made it dominant in stationary energy storage and increasingly common in vehicles and tools.

LFP cells deliver lower energy density than nickel-based chemistries: roughly 120, 160 Wh/kg versus 200, 260 Wh/kg for NCA or NMC. This trade-off is deliberate. The iron-phosphate structure is thermally stable; the cathode material resists runaway decomposition even when overcharged, crushed, or shorted. A damaged LFP cell is far less likely to ignite than a damaged NMC cell, which matters enormously in utility-scale battery banks where a thermal event can cascade across thousands of units.

LFP cells also tolerate deeper discharge cycles without degradation. They reach 3000, 5000 full cycles at 80% capacity retention, versus 1000, 2000 cycles for NCA chemistry. This longevity reduces the effective cost per cycle and extends useful life to 10+ years in grid applications. The trade is a lower voltage per cell, approximately 3.2 V nominal rather than 3.7 V, so LFP packs require more cells in series to reach the same system voltage.

Where LFP dominates and where it does not

LFP is now the standard choice for containerized grid storage, electric buses, fork-lift trucks, and backup power systems. Its safety profile and cycle life align perfectly with these applications. Portable consumer electronics and luxury vehicles, by contrast, still favor NCA or NMC because the added weight of LFP's lower density is unacceptable; an extra kilogram in a smartphone or a 50 kg penalty in a car matters commercially. Early-stage electric aircraft will use NCA or solid-state designs for the same reason.

The naming reflects the active material, not the full chemistry. The initialism LFP is now standard in the battery industry, though some older documents call it LiFePO₄ or refer to it by the trade name LFP. Prices for LFP cells have fallen sharply since 2020, narrowing the gap with NMC in certain stationary applications and accelerating adoption in regions where cycle life and safety matter more than energy density.