Lithium batteries can explode when charged.
Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materials. During the charging process, the positive electrode material releases lithium ions into. carbon, forming intercalation compounds, is chemically very unstable.
Not all batteries that enter thermal runaway will explode. Cell phones, laptops, etc. use small lithium batteries, which dissipate heat easily, and the risk of explosion is about one in ten million.
The fundamental cause of safety accidents such as explosions and combustions in lithium batteries is that the temperature inside the battery rises too quickly or the pressureon internal is too high. However, the explosion of the battery depends on the condition of the battery. load, heat transfer rate and opening of the safety valve. It is linked to many factors such as sensitivity and external ambient temperature.
Methods for solving lithium battery safety issues:
Safety can be improved by optimizing the structure and design of lithium batteries. For example, choose cathode materials with high thermal stability, flame-retardant electrolytes, negative electrode materials that do not precipitate lithium, and high-performance separators.
In fact, the academic community already has a solution to the lithium battery safety problem, but it is still in the theoretical stage and is still far from being applied. Nowadays, heat-sensitive materials are manufactured at home and abroad. In dUnder normal circumstances, heat-sensitive materials are conductors or semiconductors. When the battery temperature is too high, heat-sensitive materials become insulators and interrupt the battery's reaction.
In addition, there is also the research and development of electrolyte blockers. However, these solutions will more or less affect the battery's energy density, service life, high temperature resistance and other properties in actual operation.
Reference for the content above? People's Daily Online - Don't let lithium batteries become "bombs"