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With regard to the safety of lithium-ion batteries, professor ai of Wuhan University made a very comprehensive analysis. From the process of Thermal runaway, the first attack on Thermal runaway was the emergence and differentiation of - SEI. Because of different negative ingredients and additives, the degree of differentiation of SEI is about 120-140 ℃. The differentiation will take place in the future. The cathode in the electrolyte will be bare, and the intense recovery and differentiation will release a lot of combustible gas and heat, Further increase the temperature of the battery until anode polarization begins.

When the positive electrode differentiates, the temperature is around 180-200 ℃, and the side effects of the cell are difficult to control. Due to the differentiation of the positive electrode, not only is a large amount of heat released, but also highly reactive oxygen atoms are generated, leading to direct oxidation and electrolyte differentiation, which will form a large amount of heat accumulation in the battery in a very short period of time.

It is worth mentioning that the relationship between temperature and side effects is positively correlated, that is, the higher the temperature, the stronger the side effects; The more severe the side effects, the higher the temperature. This vicious cycle eventually leads to an uncontrollable self heating state of the battery, the so-called Thermal runaway.

The Iron(II) phosphate industry often says that safety is good, because it can be used as an anode without important differentiation at 200-400 ℃, but the generation of positive extreme heat is part of the side reaction, and the oxidation and differentiation of the anode and electrolyte still exist, so Iron(II) phosphate lithium is slightly safer than ternad. The differential temperature varies with different components. The higher the nickel content, the lower the thermal differentiation temperature. For example, when the nickel content reaches 0.8, thermal differentiation begins around 120 degrees, even before the negative SEI film, which poses a great challenge to temperature control of batteries.

The battery heats out of control, causing internal short circuit or overcharge.

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