▎ 摘　　要

NOVELTY - The preparation of silicon carbide/graphene negative electrode composite material, involves (S1) cleaning tantalum sheet, preparing polydimethylsiloxane solution, leaving still for use, and spreading polydimethylsiloxane solution evenly on cleaned tantalum sheet, infrared baking and leaving still for complete curing to obtain polydimethylsiloxane/tantalum sheet, and (S2) utilizing polydimethylsiloxane as carbon source and silicon source, and after direct current arc plasma spraying, and stripping tantalum sheet. USE - Preparation of silicon carbide/graphene negative electrode composite material used for flexible water system asymmetric capacitor (claimed) and energy storage device e.g. super capacitor. ADVANTAGE - The method enables preparing silicon carbide/graphene negative electrode composite material using easy to obtain raw materials by simple process ensuring high reliability, which is conducive to large-scale preparation. The introduction of graphite and boron graphene into the pure silicon carbide material makes the capacitance performance better, and the capacitors ensures enhanced energy storage effect. The method ensures excellent energy storage performance, mechanical performance, stability in severe environment, and ion adsorption capacity and high Fermi level. The method enables easily and economically preparing silicon-carbide-boron-doped graphene anode composite materials ensuring high yield and enhanced quality. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing flexible water-system asymmetric capacitor.