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1. Safety hazards of positive electrode materials

When lithium-ion batteries are not used properly, the internal temperature of the battery increases, causing the analysis of active substances and oxidation of the electrolyte in the positive electrode material. At the same time, these two reactions can generate a large amount of heat, resulting in a further increase in battery temperature. The effects of different lithium removal states on the lattice transition of active substances, analysis temperature, and thermal stability of batteries vary greatly.

2. Safety hazards of negative electrode materials

The early negative electrode material used was lithium metal, and assembled batteries were prone to lithium dendrites after multiple charges and discharges, which could puncture the separator, causing battery short circuits, leakage, and even explosions. Lithium intercalation compounds can effectively prevent the occurrence of lithium dendrites, greatly improving the safety of lithium-ion batteries. As the temperature increases, the carbon negative electrode in the lithium intercalation state first undergoes an exothermic reaction with the electrolyte. Under the same charging and discharging conditions, the exothermic rate of the reaction between the electrolyte and lithium intercalated artificial graphite is much higher than that of the reaction with lithium intercalated mesophase carbon microspheres, carbon fibers, coke, etc.

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