Polydopamine/lithium phosphate composite organic layer/inorganic layer co-coated micron silicon material and preparation method thereof

The invention relates to a polydopamine/lithium phosphate composite organic layer/inorganic layer co-coated micron silicon material and a preparation method thereof, and belongs to the technical field of electrochemical energy storage. The preparation method comprises the following steps: mixing and dispersing micron silicon particles and lithium phosphate in an acid solution, heating and stirring until the solution is evaporated to dryness, collecting a solid product and grinding to obtain dark brown powder; transferring the dark brown powder into a tubular furnace, and carrying out heat treatment under a protective atmosphere to obtain Si-coated LPO powder; dispersing the Si-coated LPO powder in a Tris solution, and carrying out ultrasonic oscillation to obtain a Si-coated LPO/Tris dispersion solution; adding dopamine hydrochloride powder into the Si-coated LPO/Tris dispersion solution to obtain a mixture; and filtering and cleaning the mixture, collecting insoluble substances, and carrying out vacuum dryin