Why do iron-lithium batteries have safety hazards?

Why do iron-lithium batteries have potential safety hazards? When the temperature of the lithium battery cell rises to 130°C, the SEI film on the surface of the negative electrode decomposes, causing the highly active lithium carbon negative electrode to be exposed to the electrolyte to undergo a violent oxidation-reduction reaction, and the heat generated makes the battery enter a high-risk state. When the internal temperature of the battery rises above 200°C, the passivation film on the surface of the positive electrode decomposes the positive electrode to generate oxygen, and continues to react violently with the electrolyte, generating a large amount of heat and forming a high internal pressure. When the battery temperature reaches above 240°C, it is accompanied by a violent exothermic reaction between the lithium carbon negative electrode and the binder. 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 intercalation negative electrode and the electrolyte, which is the direct cause of the temperature increase of the iron-lithium battery and the thermal runaway of the battery. The flammability of electrode materials: The organic solvents used in lithium batteries are flammable and have a low flash point. Thermal runaway caused by unsafe behavior can easily ignite low flash point flammable liquid components and cause the battery to burn. Lithium battery negative electrode carbon materials, separators and positive electrode conductive carbon are also combustible. The probability of burning iron-lithium batteries is higher than the probability of battery explosion, but the explosion of the battery must be accompanied by combustion. In addition, when the lithium battery is cracked and the air humidity in the external environment is high, the moisture and oxygen in the air can easily undergo a violent chemical reaction with the lithium-intercalated carbon negative electrode to release a large amount of heat and cause the battery to burn. The flammability of electrode materials is a major difference between lithium batteries and water-based secondary batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to classify 18650 lithium batteries?