▎ 摘　　要

NOVELTY - Preparing calcium germanate/graphene nanocomposite material involves adding calcium hydroxide and graphene oxide into distilled water in mass ratio of 1:0.5-2 and then subjecting the obtained material to perform ultrasonic wave processing for 10-30 minutes. The process material is added with germanium dioxide and then subjecting the obtained material to perform ultrasonic wave processing to obtain precursor solution, where the molar ratio of germanium dioxide and calcium hydroxide is 3-3.5-1. The obtain precursor solution is added with polytetrafluoroethylene. USE - Method for preparing calcium germanate/graphene nanocomposite material (claimed) used as negative electrode active material of lithium ion battery. ADVANTAGE - The method enables to prepare calcium germanate/graphene nanocomposite material with high purity and performance, and good circulation stability. DETAILED DESCRIPTION - Preparing calcium germanate/graphene nanocomposite material involves adding calcium hydroxide and graphene oxide into distilled water in mass ratio of 1:0.5-2 and then subjecting the obtained material to perform ultrasonic wave processing for 10-30 minutes. The process material is added with germanium dioxide and then subjecting the obtained material to perform ultrasonic wave processing to obtain precursor solution, where the molar ratio of germanium dioxide and calcium hydroxide is 3-3.5-1. The obtain precursor solution is added with polytetrafluoroethylene in a high pressure reaction vessel and then the reaction vessel is kept in drying box at constant temperature to perform hydrothermal reaction. The reacted material is heated in distilled water and then the heated material is washed, dried and baked in inert atmosphere to obtain the desired product.