▎ 摘　　要

NOVELTY - Preparation of composite material involves adding 0.1-0.2 g graphene oxide, 80 ml deionized water, stirring, dispersing ultrasonically for 3 hours to obtain solution (A), dropping 5 ml ethyl orthosilicate to obtained solution (A), stirring for 2 hours to obtain solution (B), adding 10 g glucose, sucrose or polyvinyl alcohol to solution (B), stirring for 10 minutes to obtain solution (C), pouring solution (C) into 100 ml hydrothermal reactor, placing in oven at 180-200 degrees C, keeping warm for 15 hours, opening hydrothermal reaction kettle, filtering, washing sample with deionized water many times, placing in oven at 80 degrees C for 12 hours to obtain sheet-graphene doped silicon oxide doped partial organic carbon-sandwich structure, mixing 1:1 ratio of sheet-graphene doped silicon oxide doped partial organic carbon-sandwich structure and magnesium powder, insulating under 600-650 degrees C argon for 8 hours to obtain sheet-graphene doped silicon doped carbon-sandwich structure, and soaking. USE - Preparation of composite material as negative electrode material for lithium ion battery. ADVANTAGE - The prepared product maintains specific capacity of 1210 mAh g-1 after 100 cycles at 0.2 C rate, and has excellent cycle stability. The sheet material has excellent bonding to the substrate, maintains excellent electrical contact, and overcomes the problem of battery material shedding. DETAILED DESCRIPTION - Preparation of composite material involves adding 0.1-0.2 g graphene oxide, 80 ml deionized water, stirring for 20 minutes, dispersing ultrasonically for 3 hours to obtain solution (A), dropping 5 ml ethyl orthosilicate to obtained solution (A), stirring for 2 hours to obtain solution (B), adding 10 g glucose, sucrose or polyvinyl alcohol to solution (B), stirring for 10 minutes to obtain solution (C), pouring obtained solution (C) into 100 ml hydrothermal reactor, placing in oven at 180-200 degrees C, keeping warm for 15 hours, opening hydrothermal reaction kettle, filtering, washing obtained sample with deionized water for many times, placing in oven at 80 degrees C for 12 hours to obtain sheet-graphene doped silicon oxide doped partial organic carbon-sandwich structure, mixing 1:1 ratio of obtained sheet-graphene doped silicon oxide doped partial organic carbon-sandwich structure and magnesium powder, insulating under 600-650 degrees C argon for 8 hours to obtain sheet-graphene doped silicon doped carbon-sandwich structure, soaking 0.1-0.3 M dilute hydrochloric acid for 3-5 hours to remove impurities including magnesium silicide and magnesium oxide from product.