Carbon-coated tin selenide composite crosslinked three-dimensional graphene as well as preparation method and application thereof

The invention discloses carbon-coated tin selenide composite crosslinked three-dimensional graphene as well as a preparation method and application thereof, belongs to the technical field of electrochemical energy storage, and solves the technical problem of poor electrochemical performance of a potassium ion battery caused by volume expansion of an electrode material when a carbon material is used as a negative electrode material of the potassium ion battery. The invention discloses a preparation method of carbon-coated tin selenide composite cross-linked three-dimensional graphene, SnSe nanoparticles are uniformly distributed on a carbon-coated cross-linked three-dimensional graphene sheet layer through a solvothermal combined heat treatment method, a composite material with SnSe/3Dr-GO at C is synthesized, and the three-dimensional cross-linked structure of 3DGO has the advantages that the three-dimensional cross-linked structure of the three-dimensional cross-linked structure of the three-dimensional cros