▎ 摘　　要

NOVELTY - Preparation of high energy graphene battery negative electrode material comprises blending oxidized graphene and isocyanate, heating, reacting, filtering, and drying; treating with dimethylformamide solution and sodium azide, heating, reacting, filtering, and drying; dispersing in tetrahydrofuran, adding lithium aluminum hydride, heating, stirring to react, filtering, and drying; hydrothermal reacting with concentrated hydrochloric acid, filtering, washing, drying, and dividing into two parts; dispersing first portion in water, adjusting pH value to acidity, adding silicate, stir-reacting, and concentrating; dispersing second portion in iron salt solution, adding dopamine, stir-reacting, using alkali liquid to adjust pH value to be alkaline, and concentrating; dispersing concentrated products, filtering, and drying; and heating under protection of inert gas, preserving temperature, reacting, cooling, washing with hydrofluoric acid, water washing, and drying. USE - The method is used for preparing high energy graphene battery negative electrode material. ADVANTAGE - The electrode material has excellent cycle stability, maintained at good level after multiple times of charging and discharging cycle, good relectrochemical performance, and volume expansion. DETAILED DESCRIPTION - Preparation of high energy graphene battery negative electrode material comprises: (A) mixing oxidized graphene and isocyanate at mass ratio of 1:20-1:100, heating, reacting, filtering, and drying; (B) treating dimethylformamide solution of graphene oxide and sodium azide at mass ratio of 1:10-1:100, heating, reacting, filtering, and drying; (C) dispersing in tetrahydrofuran, adding lithium aluminum hydride, heating, stirring to react, filtering, and drying; (D) hydrothermal reacting with concentrated hydrochloric acid, filtering, washing, drying, and dividing into two parts; (E) dispersing first portion in water, adjusting pH value to acidity, adding 10-50 wt.% silicate, stir-reacting, and concentrating; (F) dispersing second portion in iron salt solution, adding 1-5 wt.% dopamine, stir-reacting, using alkali liquid to adjust pH value to be alkaline, and concentrating; (G) dispersing concentrated products, filtering, and drying; and (H) heating under protection of inert gas to 1500-1800 degrees C, preserving temperature, reacting, cooling, washing with hydrofluoric acid, water washing, and drying.