BATTERY MATERIAL AND PREPARATION METHOD THEREOF

A battery material (10) includes: a conductive substrate (11); and a silicon material layer (12) disposed on at least one side of the conductive substrate (11) and including silicon fibers (121), at least some of which aggregate to form silicon fibrous spheres (122). A preparation method for the battery material includes: (a) providing a conductive substrate (S201); (b) providing a silicon-based material, followed by depositing on a surface of the silicon-based material a film comprising amorphous silicon or crystalline silicon to form a silicon source material (S202); (c) placing the silicon source material of step (b) on at least a side of the conductive substrate of step (a), wherein the distance between the conductive substrate and the silicon source material is less than 100 mm (S203); and (d) heating the conductive substrate and silicon source material thus arranged in step (c) to allow the silicon source material to release amorphous silicon or crystalline silicon (S204).