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It can be seen that the damage of the SEI film on the surface of the negative electrode leads to a violent exothermic reaction between the highly active lithium embedded negative electrode and the electrolyte, which is the direct cause of the temperature rise of the iron lithium ion battery and the thermal runaway of the battery.

Flammability of electrode materials: The organic solvents used in lithium-ion batteries are flammable and have a low flash point. Unsafe behavior leading to thermal runaway can easily ignite combustible liquid components with low flash points and cause battery combustion. Lithium ion negative electrode carbon materials, separators, and positive electrode conductive carbon also have flammability.

The probability of combustion in iron lithium-ion batteries is higher than that of battery explosion, but battery explosion must be accompanied by combustion. In addition, when lithium-ion batteries crack and the external air humidity is high, the moisture and oxygen in the air are prone to undergo violent chemical reactions with the carbon negative electrode embedded in lithium, releasing a large amount of heat and causing the battery to burn. The flammability of electrode materials is a major difference between lithium-ion batteries and aqueous secondary batteries.

The electrode materials and electrolytes of iron lithium-ion batteries are flammable, and heating (internal or external) can cause fires and decompose into gases, thereby increasing the possibility of battery explosions. Moreover, the strength of polymer isolation membranes nowadays is relatively low, which can easily damage this layer of film in the event of collision or overheating, leading to short circuits in lithium-ion batteries.

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