Multi-layer coated inorganic particle, preparation method thereof, water-based functional coating slurry, lithium battery diaphragm and lithium battery

The invention discloses a multi-layer coated inorganic particle, a preparation method thereof, a water-based functional coating slurry formed by the multi-layer coated inorganic particle, a lithium battery diaphragm and a lithium battery. The multi-layer coated inorganic particles are divided into three layers, the inner layer is inorganic flame-retardant particles, the middle layer is viscous organic matter PVDF-HFP, and the outer layer is coated with polyvinyl alcohol organic matter. And the PVDF-HFP in the middle layer can provide good adhesion, prevents the staggered layers of the pole piece and the diaphragm, and has good ionic conductivity at high temperature. The polyvinyl alcohol on the outer layer has good low-temperature ionic conductivity and adhesion, and makes up for the deficiency of ionic conductivity of PVDF-HFP at low temperature. 本发明公开了一种多层包覆无机物颗粒及其制备方法、其形成的水系功能性涂覆浆料、锂电池隔膜和锂电池。多层包覆无机物颗粒分为三层，内层为无机阻燃颗粒，中层为具有粘性的有机物PVDF-HFP，外层为聚乙烯醇有机物包覆。中层的PVDF-HFP能提供较好的粘接性，防止极片与隔膜的错层，同时在高温时有良好的离子导电性。外层的聚乙烯醇具有良好