Lithium supplement safety coating, positive pole piece and lithium ion battery

The invention provides a lithium-supplementing safety coating, a positive pole piece and a lithium ion battery. The lithium-supplementing safety coating comprises a pore-forming agent, a binder, an inorganic filler and a conductive agent, the pore forming agent comprises a self-sacrifice lithium salt. The porous structure is constructed in the lithium supplementing safety coating, the electrochemical performance of the battery is improved, and when the temperature rises, the resistance of the lithium supplementing safety coating is increased, so that the lithium ion battery is protected; meanwhile, the pore-forming agent in the lithium-supplementing safety coating can supplement the loss of Li < + >, so that the first charge-discharge capacity loss of the battery is reduced, and the first efficiency and the energy density of the battery are improved. 本发明提供了一种补锂安全涂层、正极极片与锂离子电池，所述补锂安全涂层包括造孔剂、粘结剂、无机填料和导电剂；所述造孔剂包括自牺牲锂盐。本发明通过在补锂安全涂层中构建多孔结构，提升了电池的电化学性能，当温度升高时，补锂安全涂层的电阻会增大，从而保护锂离子电池；同时，所述补锂安全涂层中的造孔剂能补充Li+的损耗，从而减少电池的