一种高性能多孔硅碳负极材料的简易制备方法  

Preparation of Porous Silicon/Carbon Composite Anode Material in a Simple Method with Good Electrochemical Properties

作　　者：郭挺 邢焱 袁旭 蔡新辉 王双才 胡博 GUO Ting;XING Yan;YUAN Xu;CAI Xinhui;WANG Shuangcai;HU Bo(School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China;Huzhou Chuangya Power Battery Material Co.,Ltd.,Huzhou 313000,China)

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310027 [2]湖州创亚动力电池材料有限公司,浙江湖州313000

出　　处：《材料科学与工程学报》2020年第2期173-181,共9页Journal of Materials Science and Engineering

摘　　要：基于一种三维结构的多孔硅原料制备了相应的锂离子电池硅碳负极材料并作了表征。该材料制备方法简单,将多孔硅先后用淀粉水溶液和沥青处理并炭化后即可得到。作为比较,还制备了未用淀粉及未用沥青处理的相应样品,并研究了这两种碳原料的作用。研究结果表明,淀粉包覆能大幅改善材料的循环和倍率性能,沥青包覆能明显提高材料的首次库伦效率。通过淀粉和沥青共同处理并炭化后得到的多孔硅碳材料的可逆容量为976.1mAh·g^-1,首次库伦效率为81.2%。该材料循环50次后的容量保持率高达93.4%。该材料的倍率性能在制备的硅基样品中最佳,在0.2C、0.5C和1C下的容量保持率分别为95.1%、78.6%和56.0%。总体而言,该材料不仅制备方法简单,而且表现出较优异的电化学性能。A silicon/carbon composite anode material of Li-ion batteries based on 3 Dporous Si was prepared and characterized.This material was easily synthesized by treating porous Si with starch water solution and pitch followed by carbonization.Samples without starch or pitch were prepared and characterized as comparison.The function of carbon source was also investigated.The results reveal that carbonized starch coating effectively improves the cycle performance and the rate performance,while carbonized pitch coating effectively improves the initial coulombic efficiency.By both starch and pitch modification,the final material exhibits reversible specific capacity of 976.1 mAh·g^-1 and initial coulombic efficiency of 81.2%.The capacity retention of this material is as high as 93.4% after50 cycles.The capacity retention of this material at 0.2 C,0.5 C and 1 C are 95.1%,78.6% and56.0%,respectively,which is the best among all the prepared Si-based samples.Overall,this silicon/carbon composite anode material can be easily synthesized with good electrochemical performance.

关 键 词：锂离子电池 硅碳负极材料 三维纳米多孔结构 不同碳原料 

分 类 号：TM912[电气工程—电力电子与电力传动]