A lithium iron phosphate (LFP) battery gives up some energy density in exchange for lower cost, longer cycle life, and better thermal stability than a nickel manganese cobalt (NMC) battery. According to the IEA, LFP packs hold about one-fifth less energy per kilogram and one-third less per liter than NMC packs, but they cost almost 30% less per kWh. NMC, especially high-nickel grades such as NMC 811, is still the choice for long range and cold climates, while LFP now leads in cost-focused EVs and in China's EV market.

• LFP (LiFePO4) has an olivine structure with a flat voltage near 3.5 V vs lithium. NMC is a layered oxide that delivers more capacity per gram at a higher voltage.
• In a multi-year study by Sandia National Laboratories, commercial LFP cells reached 80% capacity after 2,500 to 9,000 equivalent full cycles (partly extrapolated), compared with 200 to 2,500 for the NMC cells tested.
• In heating tests on 18650 cells, the LFP cell went into thermal runaway at about 195 °C, compared with about 170 °C for an NMC cell, and its temperature rose far less once it did.
• LFP contains no nickel or cobalt. Cobalt mining is concentrated in the Democratic Republic of the Congo, which supplied 76% of world output in 2024.
• LFP made up nearly half of the global EV battery market in 2024. Development is moving toward manganese-doped LFP (LMFP) on one side and higher-nickel NMC on the other.

What is a lithium iron phosphate battery?

An LFP battery is a lithium-ion battery whose cathode is LiFePO4, paired in most cells with a graphite anode. Padhi, Nanjundaswamy, and Goodenough reported it as a cathode in 1997, showing reversible lithium extraction to FePO4 at 3.5 V vs lithium. The material crystallizes in the olivine structure: lithium and iron sit in octahedral sites, and phosphorus sits in PO4 tetrahedra within a nearly hexagonal close-packed oxygen lattice. Its theoretical capacity is 170 mAh/g.

Charging converts LiFePO4 to FePO4 through a two-phase reaction, which is why LFP has an unusually flat voltage curve. The lattice volume changes by only 6.81% between the two phases. The weakness is transport. In the original work, only about 0.6 Li per formula unit could be cycled, giving 100 to 110 mAh/g. The authors attributed this limit to slow lithium transport across the boundary between the two phases. Commercial LFP cathodes get around this with carbon-coated, nanoscale particles.

What is an NMC battery, and what does NMC 811 mean?

NMC cathodes are layered oxides with the formula LiNixMnyCozO2. They descend structurally from LiCoO2 and LiNiO2: sheets of transition-metal oxide alternate with layers of lithium. The digits give the Ni:Mn:Co ratio. NMC 111 has equal parts, and NMC 811 is 80% nickel, 10% manganese, and 10% cobalt. Nickel supplies most of the redox capacity, but layered oxides become less thermally stable as their nickel content rises.

Raising nickel content increases capacity. In work by Noh et al., summarized by Jung et al., NMC 811 delivered an initial 203 mAh/g versus 163 mAh/g for NMC 111 (0.1C, 4.3 V cutoff, lithium half-cells). However, at 0.5C it kept only 70% of capacity after 100 cycles, compared with 92% for NMC 111. Jung and coworkers' own gas-analysis experiments showed that NMC 811 releases lattice oxygen from about 4.3 V vs lithium, compared with about 4.7 V for NMC 111 and NMC 622. That oxygen reacts with the electrolyte to form CO2 and CO, so in their graphite full cells NMC 811 met their stability criterion (at least 90% retention over 300 cycles) only up to 4.0 V, versus 4.4 V for NMC 111 and NMC 622. The IEA counts NMC 622, 721, and 811, NCA, and NMCA as "high-nickel" chemistries.

LFP vs NMC: how do energy density and voltage compare?

LFP's energy deficit has three causes: lower cell voltage, lower specific capacity, and a less dense crystal structure. In the Sandia study, the commercial LFP cell had a nominal voltage of 3.3 V, compared with 3.6 V for the NMC cell, whose cathode was a nickel-enriched variant of NMC 811. At the pack level, the IEA puts LFP about one-fifth lower in Wh/kg and one-third lower in Wh/L. It notes that the gap has narrowed and is partly offset because LFP can be charged to 100% routinely, while NMC is typically limited to 80% to preserve its life.

Which lasts longer, LFP or NMC?

In the largest public head-to-head comparison, LFP lasted longer. Sandia cycled commercial 18650 cells across a matrix of temperatures, depths of discharge, and discharge rates. The LFP cells reached 80% capacity after 2,500 to 9,000 equivalent full cycles, compared with 250 to 1,500 for NCA and 200 to 2,500 for NMC. The upper LFP values were extrapolated, because many LFP cells had not yet reached 80% when the study ended. The authors add two caveats. When cells are compared by total energy delivered, which accounts for LFP's lower capacity and voltage, the gap shrinks. And NMC and NCA were more sensitive than LFP to cycling across the full 0–100% state-of-charge range.

Structure likely explains much of the difference. LFP's small volume change and strongly bonded phosphate framework are consistent with slow degradation. Nickel-rich layered oxides, in contrast, can form disordered spinel and rock-salt surface layers as they lose oxygen at high states of charge.

Is LFP safer than NMC?

LFP is generally more tolerant of abuse, though no lithium-ion cell with a flammable liquid electrolyte is fireproof. In a controlled heating study of commercial 18650 cells, the LFP cell had the highest onset temperature (~195 °C), the smallest temperature rise during runaway (~210 °C), and the least gas (~50 mmol). The NMC cell in the same study started runaway at about 170 °C, rose about 500 °C, and released about 150 mmol of gas. Note that this NMC was a low-nickel Li(Ni0.45Mn0.45Co0.10)O2, not NMC 811. Because thermal stability falls as nickel content rises, high-nickel grades start from a less favorable position.

The chemistry explains the difference. Oxygen in LiFePO4 is held in strong covalent P–O bonds within PO4 groups. A charged high-nickel layered oxide can release reactive lattice oxygen that oxidizes the electrolyte, feeding heat into a runaway event.

How do cost and raw materials differ between LFP and NMC?

LFP cathodes use iron and phosphate. NMC needs nickel and cobalt, and both supply chains are concentrated. The Democratic Republic of the Congo produced an estimated 76% of mined cobalt in 2024, followed by Indonesia at 10%, and China leads cobalt refining. Indonesia produced about 2.2 million of the world's 3.7 million tons of mined nickel in 2024. The USGS also reports that cobalt-free iron-phosphate cathodes held significant market share in China, which reduces demand for cobalt.

LFP still needs lithium, and it has its own concentration risk. The IEA describes China as having a de facto monopoly on LFP batteries: nearly all LFP batteries in electric cars sold in Europe and the United States in 2024 were made in China. The IEA also notes a proposal from the Chinese government to restrict exports of LFP cathode technology. If you want to remove lithium from the supply chain as well, see our sodium-ion vs lithium-ion guide.

Where is each chemistry used?

According to the IEA's 2025 outlook, LFP supplied nearly three-quarters of China's EV battery demand in 2024 and reached 80% of batteries sold there in November and December. Its share stayed below 10% in the United States and passed 10% in the European Union, while Southeast Asia, Brazil, and India topped 50%. Tesla accounted for 85% of the LFP-equipped EVs produced in the United States. The IEA concludes that LFP now performs well enough for most EVs. NMC keeps an advantage where long range or cold-weather operation matters, and it remains the most widely used chemistry in the United States and Europe.

For stationary storage, cycle life and safety usually matter more than mass. That is the use case the Sandia comparison was designed for, and in it LFP showed the longest cycle life and generally the highest round-trip efficiency.

What comes next: LMFP and higher-nickel NMC

LMFP (lithium manganese iron phosphate) replaces part of the iron in LFP with manganese to raise voltage while keeping the olivine framework. The 1997 olivine paper already showed that in LiFe1−xMnxPO4, the Mn3+/Mn2+ couple operates at 4.1 V, versus 3.5 V for Fe3+/Fe2+. In that study, lithium could not be extracted electrochemically from pure LiMnPO4 under the conditions tested, while mixed iron-manganese compositions did cycle. The IEA includes LMFP in its LFP market totals. On the layered side, the next step is compositions with 90% or more nickel, such as LiNi0.9Co0.05Mn0.05O2. Developers rely on surface coatings, doping, and core-shell or gradient particles to manage the oxygen-release and cycling problems described above.

Frequently asked questions

Is LFP better than NMC?

Neither chemistry is better for every use. LFP is cheaper per kWh, lasts more cycles, and is more thermally stable. NMC stores more energy per kilogram and per liter, which matters for long range.

Can you charge an LFP battery to 100%?

Generally, yes. The IEA notes that LFP can reach 100% state of charge without significant degradation, while NMC is typically limited to 80%. Always follow the vehicle or system maker's guidance.

Does LFP perform worse in the cold?

Generally, yes. The IEA notes that LFP is typically less effective in cold climates than NMC. Sodium-ion cells are being positioned partly to fill that cold-climate gap.

Does LFP contain cobalt?

No. LiFePO4 contains lithium, iron, phosphorus, and oxygen. NMC contains cobalt, though high-nickel grades such as NMC 811 contain much less than NMC 111.

What is the voltage of an LFP cell?

The commercial LFP cell in the Sandia study was rated at 3.3 V nominal, compared with 3.6 V for the NMC cell, reflecting LFP's lower operating voltage.

Explore LFP and NMC materials on LatticeGraph

Compare computed (DFT) structures, stability, and band gaps for LiFePO4, LiMnPO4, and LiNiO2, along with literature synthesis recipes and related patents. Browse the olivine phosphate cathodes and layered lithium oxides classes. To see why LiCoO2-type cathodes run into limits, read our LiCoO2 analysis.