Advantages of lithium iron phosphate batteries over lead-acid batteries
1. Large capacity
Individual cells can be manufactured in the range of 5Ah to 1000Ah, while 2V lead-acid battery cells are typically 100Ah to 150Ah, with a smaller variation range;
2. Lightweight
A lithium iron phosphate battery of the same capacity has a volume that is 2/3 that of a lead-acid battery and a weight that is 1/3 that of the latter.
3. Fast charging with strong energy
Lithium iron phosphate batteries can achieve a starting current of up to 2C, enabling high-rate charging, while lead-acid batteries generally require a current of 0.1-0.2C, which cannot achieve fast charging performance.
4. Environmental friendliness
Lead-acid batteries contain a large amount of the heavy metal lead, which results in lead-containing waste liquid, while lithium iron phosphate batteries do not contain any heavy metals and are pollution-free during production and use.
5. High cost performance
Although lead-acid batteries have lower purchase costs than lithium iron phosphate batteries due to their cheaper materials, they are less economical in terms of lifespan and daily maintenance. The cost-effectiveness of lithium iron phosphate batteries is more than four times that of lead-acid batteries.
6. Long lifespan
Lithium iron phosphate batteries have a lifespan of over 2000 cycles, while lead-acid batteries only have a lifespan of around 300-500 cycles.
From a safety perspective, high and low temperatures significantly impact the safety of lithium iron phosphate (LFP) batteries. At low temperatures, the capacity of lithium-ion batteries decreases sharply, internal resistance increases, and lithium dendrites form on the negative electrode material during charging and discharging. With increasing cycle count at low temperatures, the extent of these dendrites expands, potentially causing internal short circuits, cell melting, fires, and explosions. At high temperatures above 55 degrees Celsius, the capacity decay of lithium-ion batteries is extremely rapid. Lithium-ion batteries are not suitable for all high-temperature conditions; above 55 degrees Celsius, the internal temperature exceeds 90 degrees Celsius, causing the solid electrolyte to decompose and accelerating chemical reactions, potentially leading to thermal runaway. Therefore, LFP batteries have a specific operating temperature range for operation in both high and low temperature environments.
