Novel silica -coated cathode to realize internal-short-circuit proof, high-interface-stabilized, high-safety lithium batteries

Lithium-Ion Batteries (LIBs) are currently used in more and more places where safety and reliability are necessary. To protect LIBs from short-circuiting, extend their life, and improve their safety, we propose a novel SiO2-nanoparticle-coated cathode. The coating can prevent short-circuiting of the lithium-ion battery when the separator fails. The SiO2 nanoparticles form a coating with high porosity, good electrolyte compatibility, and increased interfacial stability of the cathode material. In this way, the coating reduces the internal resistance of the cell to a certain extent, thus improving cycle performance and Coulombic efficiency. The thermal safety performance of the assembled pouch batteries is investigated. The results show that the pouch cell assembled with a protective layer of cathode prolongs the occurrence time of thermal runaway, reduces the amount of heat released by thermal runaway, and improves batteries safety. •This coating can effectively prevent lithium metal batteries short-circuiting.•The coating increases the interfacial stability of the cathode with an electrolyte.•The coating improves the fire safety of the lithium batteries.