▎ 摘　　要

NOVELTY - Preparation of ultrathin shell graphene hollow spheres, involves dispersing graphene oxide in deionized water to obtain graphene oxide dispersion, adding ammonia, ethanol, deionized water and ethyl orthosilicate to reaction vessel, stirring evenly, stirring, washing the solid precipitate with ethanol and deionized water, drying to obtain silica sphere template, dispersing silica sphere template in deionized water to obtain silica sphere template dispersion, uniformly mixing graphene oxide dispersion and silica sphere template dispersion, ultrasonically dispersing, placing in freeze dryer, placing obtained silica-graphene oxide core-shell spheres in plasma high-temperature tubular reactor, reacting and heating to obtain black uniform powder as silica-graphene core-shell spheres, dissolving silica-graphene core-shell spheres in hydrofluoric acid, stirring, filtering to obtain precipitate, washing with ethanol and deionized water and drying to obtain black fluffy powder. USE - Method for preparing ultrathin shell graphene hollow spheres used in pure electric vehicle and hybrid electric vehicle. ADVANTAGE - The method enables mass preparation of ultrathin shell graphene hollow spheres with short process. DETAILED DESCRIPTION - Method for preparing ultrathin shell graphene hollow spheres, involves (1) preparing graphene oxide by Hummers method, dispersing graphene oxide in deionized water to obtain graphene oxide dispersion, (2) adding ammonia, ethanol, deionized water and ethyl orthosilicate to reaction vessel, stirring evenly, stirring at 360 rpm for 2 hours, washing the solid precipitate with ethanol for 6 times and deionized water for 3 times, drying at 100 degrees C for 24 hours to obtain silica sphere template, dispersing silica sphere template in deionized water to obtain silica sphere template dispersion, (3) uniformly mixing graphene oxide dispersion and silica sphere template dispersion in volume ratio of 1:1, ultrasonically dispersing for 3 hours, placing in freeze dryer at -45 degrees C, obtaining fluffy yellow powder as silica-graphene oxide core-shell spheres, placing the silica-graphene oxide core-shell spheres in plasma high-temperature tubular reactor, reacting at 10-20 Pa and heating to obtain black uniform powder as silica-graphene core-shell spheres, (4) dissolving silica-graphene core-shell spheres in hydrofluoric acid, stirring at 360 rpm for 4 hours, filtering to obtain precipitate, washing with ethanol for 6 times and with deionized water for 3 times and drying in a vacuum box for 24 hours to obtain black fluffy powder.