While the energy storage market is experiencing explosive growth, the debate over technical routes has never stopped. Lithium iron phosphate (LFP) and ternary lithium (NCM/NCA) are the two current mainstreams. The competition pattern between the two in the energy storage field shows a significantly different trend from the power battery field.

1. Comparison of core indicators

  • energy density: Ternary lithium monomer can reach 200~260Wh/kg, and lithium iron phosphate is usually 140~180Wh/kg. Ternary is dominant in volume-limited scenarios.
  • cycle life: Lithium iron phosphate can generally reach 4000~6000 times or even higher, and ternary acid can generally reach 2000~3000 times. Energy storage emphasizes the whole life cycle cost, and the weight of life is extremely high.
  • security: The thermal runaway temperature of lithium iron phosphate is higher (approximately 500°C or above) and the heat release is milder; the thermal stability of ternary lithium is relatively weak, requiring more complete thermal management and fire protection design.
  • cost: Lithium iron phosphate does not contain cobalt or nickel, and the risk of raw material cost and price fluctuations is lower; ternary lithium is greatly affected by the price of nickel and cobalt.
  • Low temperature performance: Ternary lithium has a better low-temperature capacity retention rate, and lithium iron phosphate attenuates significantly in a -20°C environment.

2. Why energy storage prefers lithium iron phosphate?

The core demands of energy storage power stations are "lowest cost per kilowatt-hour" and "long-term safety and reliability." The power station occupies a relatively ample area and is insensitive to the volumetric energy density; and every 1,000 times the cycle life is increased, the life cycle cost will decrease significantly. Coupled with the fire protection and insurance cost advantages brought by safety, lithium iron phosphate has become the absolute mainstream in energy storage on the power generation side and grid side, with a market share of more than 90%.

3. Living space of ternary lithium

Ternary lithium is not out. In scenarios that are sensitive to space and weight - such as industrial and commercial energy storage cabinets, mobile energy storage vehicles, and overseas home energy storage wall-mounted products (pursuing compact appearance) - Sanyuan still has advantages. In addition, some manufacturers are trying to find a new balance between energy density and cost through improved solutions such as "ternary + lithium iron manganese phosphate" composite or silicon-doped lithium supplement.

4. Potential impact of new technologies

With its resource endowment and low-temperature performance, sodium-ion batteries are regarded as a powerful supplement to energy storage. They have entered the 100-megawatt demonstration stage starting in 2024, but their cycle life and energy density still need to be verified. Flow batteries (all-vanadium) have outstanding safety and lifespan advantages in long-term energy storage (more than 4 hours), but they have low energy density and high initial investment. These technologies are more likely to "coexist in different scenarios" in the next 5 to 10 years rather than completely replace them.

5. Conclusion

The essence of the battle over technical routes is the different ranking of cost, safety, lifespan, and density in different scenarios. There is no best battery, only the most suitable battery.