锂离子电池负极用的硅/石墨烯层状复合材料及其制备方法

Silicon/graphene laminar composite material for lithium ion battery cathode and preparation method thereof

Abstract

The invention relates to a preparation method of a silicon/graphene laminar composite material for lithium ion battery cathode. The composite material adopts a laminar sandwich structure, silicon nano-particles are dispersed on each lamina of the grapheme, the laminas of the grapheme are separated from one another by the silicon nano-particles and the edges of the laminas are in lapped joint so as to constitute a laminar conductive network structure. The preparation method thereof comprises the steps of: formulating anhydrous silicon tetrachloride, surface active agent, sodium naphthalene and graphite oxide to tetrahydrofuran solution, adding the tetrahydrofuran solution into a reactor for reaction in vacuum at the temperature ranging from 380 to 400 DEG C, filtering the reactant to result in the product, and then washing, drying and heating the product to obtain the silicon/grapheme composite material. The preparation method of the invention has the advantages of simple preparation process and great easiness for industrial production; and the silicon/graphene laminar composite material prepared according to the method includes excellent conductivity, power performance, electrochemical activity and cycle stability, and is particularly suitable for manufacturing lithium ion battery cathode.
本发明涉及一种锂离子电池负极用的硅/石墨烯复合材料及其制备方法。该复合材料为层状三明治结构,在石墨烯每片层上分散着硅纳米粒子,石墨烯片层中间由硅纳米粒子分隔开,而边缘搭接在一起,构成层状导电网络结构。其制备过程:将无水四氯化硅、表面活性剂、萘钠与氧化石墨配制成四氢呋喃溶液,溶液加入反应器中,在真空和温度380-400℃下反应、过滤得产物,产物再经洗涤、干燥和热处理,得到硅/石墨烯复合材料。本发明优点在于,制备工艺简单,易于工业化生产;制的硅/石墨烯复合材料具有良好的导电性、功率性能、电化学活性和循环稳定性,特别适用于制作锂离子电池负极。

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