The cheaper, safer battery chemistry quietly taking over electric cars
Lithium iron phosphate batteries store less energy per kilogram than the nickel-rich cells in premium electric cars. They win anyway on price, safety and lifespan, using iron and phosphate, both plentiful, instead of costly nickel and cobalt. By 2025 they held around 85% of the stationary storage market.
The chemistry pairs a lithium iron phosphate cathode with a graphite anode. The compound occurs in nature as the mineral triphylite, and a team led by Padhi identified it as a battery cathode in 1996, building on work by Arumugam Manthiram and John Goodenough. Its big weakness was poor electrical conductivity, eventually solved by shrinking the particles and coating them in conductive carbon, or by doping them with metals such as niobium and zirconium, an approach pursued at MIT.
The trade-offs are clear. A good nickel manganese cobalt cell can exceed 300 watt-hours per kilogram; CATL claimed 205 for its best iron phosphate cell in 2024 and BYD 150. In return, the iron phosphate type usually survives more than 3,000 charge cycles and over 10,000 in ideal conditions, against roughly 1,000 to 2,300 for nickel cells. It resists heat far better too, because unlike layered oxide cathodes it does not release oxygen as it warms, making fires much less likely, though not impossible under abuse.
Prices have tumbled. Average cells cost $137 per kilowatt-hour in 2020 and $100 in 2023, and by early 2024 the Chinese carmaker Leapmotor said it paid about $56. Each cell gives a nominal 3.2 volts, so four in series nearly match a six-cell lead-acid battery, making them a drop-in upgrade for vehicles and solar systems if chargers are adjusted.
Chinese firms held a near-monopoly on production in 2022, when key patents began expiring. In September that year the chemistry supplied 31% of the electric-vehicle battery market, two-thirds of it through Tesla and BYD alone. Adoption varies enormously by region: in 2025 it powered 79% of new light-vehicle battery capacity in China but just 5% in North America.
Source: Lithium iron phosphate battery
