NEGATIVE ELECTRODE ACTIVE MATERIAL OF SELF-SUPPORTING METAL SULFIDE-BASED TWO-DIMENSIONAL NANOSTRUCTURE AND PRODUCTION METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode active material of high crystallinity, high uniformity and high purity self-supporting metal sulfide-based two-dimensional nanostructure applicable to a secondary battery, and to provide a production method therefor.SOLUTION: The negative electrode active material grows directly, as a metal sulfide-based two-dimensional nanostructure, on a metal substrate by peeling an aggregate composed of a metal sulfide-based material. The production method thereof includes a step for producing an aggregate composed of a metal sulfide-based material, a step for inserting the aggregate into a tube in an electric furnace for pulse laser vapor deposition, a step for inserting a metal substrate into a tube and locating the metal substrate separately from the aggregate, a step for lowering the pressure in the tube to vacuum state and raising the temperature of the electric furnace to 590-610°C, and a step for peeling the aggregate by injecting pulse laser into the tube. The metal sulfide-based material is grown, as a two-dimensional nanostructure, directly on the metal substrate.