▎ 摘　　要

NOVELTY - A graphene nanomaterial composite comprises graphene oxide, carboxymethyl chitosan, tin dioxide and oxidized glucan. The composite is prepared by mixing microsphere with sodium acetate buffer solution, adding potassium periodate into flask, stirring and reacting, filtering to obtain pre-treated microsphere, mixing graphene oxide and water, ultrasonically dispersing to obtain graphene oxide dispersion liquid, mixing graphene oxide dispersion liquid and pre-processed microsphere, stirring and reacting, filtering to obtain pre-modified microsphere blank, and drying to obtain modified microsphere; and mixing modified microsphere with tin source aqueous solution, stirring and reacting, filtering to obtain composite blank, mixing composite blank with sodium hydroxide solution, stirring and reacting, filtering to obtain pre-processed composite blank, carbonizing, discharging, and performing index analysis. USE - The graphene nanomaterial composite is used for electrode of lithium electronic battery (claimed). ADVANTAGE - The composite has excellent electrochemical performance and good coulombic efficiency after repeated use. DETAILED DESCRIPTION - A graphene nanomaterial composite comprises 15 pts. wt. graphene oxide, 28 pts. wt. carboxymethyl chitosan, 8 pts. wt. tin dioxide and 7 pts. wt. oxidized glucan. The composite is prepared by: (A) mixing carboxymethyl chitosan and dextran according to mass ratio of 5:1 in beaker, adding 20 times water in beaker, stirring and mixing at 30 degrees C for 30 minutes at speed of 380 revolutions/minute (rpm) to obtain mixed solution, dropping mixed solution into 8 wt.% hydrochloric acid solution at rate of 8 mL/minute, stirring and dispersing for 60 minutes at speed of 280 rpm to obtain microsphere blank dispersion, adjusting pH to neutral using 5 wt.% ammonia water, adding mixed crosslinking agent solution, stirring and reacting to 40 degrees C for 4 hours at speed of 300 rpm, filtering to obtain filter cake, and drying filter cake to 65 degrees C for 2 hours to obtain microsphere; (B) mixing microsphere with sodium acetate buffer solution with pH of 3.6 according to mass ratio of 1:10 in flask, adding potassium periodate into flask, stirring and reacting to 45 degrees C for 3 hours at speed of 400 rpm, filtering to obtain pre-treated microsphere, mixing graphene oxide and water according to mass ratio of 1:100, ultrasonically dispersing for 30 minutes at frequency of 45 kHz to obtain graphene oxide dispersion liquid, mixing graphene oxide dispersion liquid and pre-processed microsphere according to mass ratio of 20:1, stirring and reacting to 50 degrees C for 180 minutes at speed of 300 rpm, filtering to obtain pre-modified microsphere blank, and drying to 80 degrees C for 2 hours to obtain modified microsphere; and (C) mixing modified microsphere with tin source aqueous solution according to mass ratio of 1:15, stirring and reacting to 30 degrees C for 100 minutes at speed of 420 rpm, filtering to obtain composite blank, mixing composite blank with 8 wt.% sodium hydroxide solution according to mass ratio of 1:8, stirring and reacting to 40 degrees C for 3 hours, filtering to obtain pre-processed composite blank, carbonizing to 600 degrees C for 6 hours, discharging, and performing index analysis.