▎ 摘　　要

NOVELTY - Preparing graphene and ferroferric oxide coated nano silicon composite material involves mixing expandable graphite and strong oxidizer, adding zirconium ball into grinding medium ball milling, and mixing by using dilute acid, filtering and drying to obtain graphene nanometre sheet. The graphene nano sheet is mixed with potassium ferrate, silicon powder and zirconium ball, and ball milled and separated to obtain product. The product is filtered, washed and dried to obtain desired product. USE - Method for preparing graphene and ferroferric oxide coated nano silicon composite material for cathode lithium ion battery (claimed). ADVANTAGE - The method enables to prepare graphene and ferroferric oxide coated nano silicon composite material which has high specific capacity, long cycle performance and excellent multiplying power performance.