THREE-DIMENSIONAL STRUCTURED PLANT-FIBER CARBON MATERIAL FOR USE AS ANODE MATERIAL FOR SODIUM-ION BATTERY AND LITHIUM-ION BATTERY, AND PREPARATION METHOD THEREOF

摘要

The present invention provides a three-dimensional structured plant-fiber carbon material for use as an anode material for a sodium-ion battery and a lithium-ion battery, and a preparation method thereof. The preparation method of the three-dimensional structured plant-fiber carbon material comprises: soaking the plant fiber into a pore forming agent, a nitrate solution, wetting the fiber at a constant temperature, after drying, calcining and grinding the fiber at a protective atmosphere, washing the resulted material with hydrochloric acid and deionized water and drying the material. The three-dimensional structured plant-fiber carbon material has a three-dimensional porous thin sheet-like and long tunnel structure, wherein the thin sheet has a thickness of 5 to 30 nm. The three-dimensional structured plant-fiber carbon material constructs an excellent conductive network, which, in combination with the porous and long tunnel structure, facilitates rapid diffusion of ions of the electrode material, and improves utilization rate of the material.