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Which one is better for thermal stability of lithium iron phosphate battery or ternary lithium battery?

by:dcfpower     2021-03-15

The thermal stability of lithium batteries directly affects its safety performance in practical applications, that is to say, the better the thermal stability, the less prone to spontaneous combustion or explosion accidents during use. The lithium batteries on the website are mainly lithium iron phosphate batteries and ternary lithium batteries, so which one of them has better thermal stability?

1. Comparison of material thermal stability between lithium iron phosphate battery and ternary lithium battery pack

From layered phase to spinel for ternary lithium battery The phase transition temperatures of the phases are 245°C, 235°C, 185°C and 135°C, respectively. The temperature range of the spinel phase gradually decreases, indicating that the thermal stability of NCM gradually decreases with the increase of Ni content. More importantly, from NCM523 to NCM811, the thermal stability of the material shows a trend of sharp decline. With the phase transition of the material, a large amount of oxygen is released. It can be seen that NCM811 has the largest oxygen release, which is several times that of other materials. The current research shows that in the whole battery system, the NCM phase transition often occurs on the surface of the particles, and the released oxygen will exist in the form of highly active singlet oxygen 1O2. The latter reacts with the electrolyte to release a large amount of heat and also produce A large amount of gas, which further deteriorates battery safety.

Lithium iron phosphate battery will only show significant weight loss when the temperature is at least higher than 230℃, which shows that LFP has good thermal stability. As mentioned above, the good thermal stability of LFP with olivine structure originates from the phosphate group in its structure, and the Fe-PO bond is much stronger than the Ni-O, Co-O and Mn-O bonds in the layered structure NCM, so LFP has better thermal stability than NCM.

2. Thermal stability comparison between lithium iron phosphate battery and ternary lithium battery pack

When it is difficult to find the comparison of results between lithium iron phosphate battery and ternary lithium battery at the same time, We can only roughly look at a lot of the results of the test data. It is not difficult to see:

(1) The thermal stability of the battery of the same system is closely related to the SOC. The higher the SOC, the worse the thermal stability of the battery;

(2) Whether from the initial heat release temperature, maximum heat release rate, or maximum temperature, heat release time analysis, the LFP system battery has obvious thermal stability advantages over the NCA (NCM) system battery .

(3) From the perspective of the material itself, LFP is obviously better in thermal stability than NCM and NCA;

Other knowledge related to the safety and stability of lithium batteries:

What is the principle of thermal conduction of lithium-ion batteries?

TIME:2020-06-30

The heat conduction principle characteristic of lithium ion battery refers to the whole process of the heat generated inside the battery through the battery shell and finally emitted to the outside air. Out of the characteristics. According to the basic internal structure and heat transfer of lithium battery pack

What is the thermal runaway of lithium battery?

TIME:2020-06-23

The thermal runaway of lithium batteries is caused by the fact that the heat generation rate of the battery is much higher than the heat dissipation rate, and a large amount of heat accumulates and is not emitted in time. thermal runaway is a positive energy feedback cycle process: increased temperature will cause the system

how to use the built-in The protection circuit keeps the battery safe

TIME:2019-02-19

In order to reduce the global risk and safety issues of the battery in transportation, storage and operation of the battery, the United States has The safety specifications of the applied nickel-based and lithium-based batteries and batteries are unified under IEC 62133. Battery

Instructions for the safe use of polymer lithium batteries

TIME:2018-11- 19

When using polymer lithium batteries, rumors about safety or lack of safety abound. Most of them started from the early polymer lithium batteries, and users lacked certain safety knowledge and operating errors at that time


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