Four types of inorganic ultrafine powders commonly used in the modification of lithium battery separators
As one of the important parts of lithium ion batteries, the diaphragm can avoid the positive and negative electrode contact and promote the shuttle of lithium ions between the two electrodes. It does not participate in the electrochemical reaction, but determines the performance and safety of the battery. Inorganic ultrafine powder coating or composite modified polymer is one of the effective methods to improve the thermal stability of the diaphragm. Using inorganic powder with high heat resistance and mechanical strength as a modifier can improve the mechanical strength of the separator and reduce the thermal shrinkage of the separator. In addition, the mixed inorganic ultrafine powder material has a good affinity with the electrolyte, which can enhance the absorption rate of the electrolyte, thereby helping to achieve a uniform distribution of lithium ions. The ultrafine powder can also increase the stability of the slurry and ensure the uniformity of the coating on the diaphra...