Coated composite material, pole piece and battery

The invention relates to the technical field of batteries, in particular to a coated composite material as well as a pole piece and a battery comprising the coated composite material. The coated composite material has a core-shell structure, the core is garnet-structured lithium lanthanum zirconium oxide particles, and the shell is a vinylidene fluoride-hexafluoropropylene copolymer. The surface of the coated composite material is provided with a hydrophobic shell, the shell can effectively isolate moisture and carbon dioxide in the air and reduce generation of lithium hydroxide and lithium carbonate, so that the stability of the coated composite material in the air is improved, and the coated composite material is not gelatinized with PVDF when being used in a nitrogen methyl solvent; the pole piece comprising the coated composite material has higher stability and excellent lithium ion conductivity; the battery prepared from the pole piece disclosed by the invention has better cycle performance. 本发明涉及电池技术领域，