Lithium iron phosphate (LFP) is a common cathode material for lithium-ion batteries. Because of its good thermal stability and safety performance, it is favored by power battery manufacturers. Relevant safety tests show that, under the existing technical conditions, only lithium ion batteries made of lithium iron phosphate can pass all safety tests, and will not catch fire or explode in acupuncture and extrusion tests, which is of great significance to electric vehicles, electric buses and other fields that require