Advantages and disadvantages of lithium iron phosphate battery

Release Time: 2022-05-25
Lithium iron phosphate battery, the full name of Ferrous lithium phosphate lithium ion battery, refers to the lithium ion battery with Ferrous lithium phosphate as the cathode material. Here's a talk about the battery naming rules in the industry. At present, we usually name the battery with the cathode material, and the cathode is generally made of graphite, such as ternary battery, which refers to NCM or NCA used as the cathode material, lithium cobaltate battery, and lithium cobaltate used as the cathode material. Similarly, Ferrous lithium phosphate refers to Ferrous lithium phosphate material used as the cathode material.

The positive pole of lithium ion battery is made of Ferrous lithium phosphate material, which has great advantages in safety performance and cycle life, which is one of the most important technical indexes of power battery. 1C cycle life can reach 2000 times, puncture does not explode, and it is not easy to burn and explode when overcharged. It is easier to use high-capacity lithium ion batteries made of Ferrous lithium phosphate cathode materials in series. From the principle of materials, Ferrous lithium phosphate is also a process of intercalation and deintercalation, which is exactly the same as lithium cobaltate and lithium manganate.

Compared with lead-acid battery, it has a good life span, which is generally 1-1.5 years. Compared with Ni-MH battery, it has a higher working voltage. Compared with Ni-Cd battery, it has better environmental friendliness, which is also an important reason why Ferrous lithium phosphate defeated these batteries and set off a lithium battery storm. Although ternary batteries are popular at this stage, lithium iron phosphate batteries are still being used on a large scale due to the uncontrollable safety problems of ternary batteries at high energy density. However, domestic battery companies are developing lithium iron phosphate batteries to large scale, adopting high-capacity lithium iron phosphate batteries (100AH or even 200AH)

2 advantages

Main advantages of lithium iron phosphate battery:

High safety performance
The P-O bond in Ferrous lithium phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse like lithium cobaltate or form strong oxidizing substances. The Ferrous lithium phosphate decomposition temperature is about 600℃, so it has good safety. Although there was burning and explosion in overcharge, its overcharge safety has been greatly improved compared with common liquid electrolyte lithium cobalt oxide battery and ternary battery.

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