球磨法制备硅基负极材料及其增强的储锂性能研究  

Preparation of Silicon-based Anode Material by Ball Milling and Its Enhanced Lithium Storage Performance

作　　者：秦圆 赵春玲 QIN Yuan;ZHAO Chunling(School of Material Science and Chemical Engin.,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学材料与化学工程学院,湖北武汉430068

出　　处：《湖北工业大学学报》2024年第5期100-107,共8页Journal of Hubei University of Technology

基　　金：大学生创新创业训练计划项目(201710500024)。

摘　　要：以微米硅为原料,采用高能球磨法制备碳纳米管/还原氧化石墨烯/硅负极材料。采用扫描电子显微镜、X-射线衍射、傅里叶红外光谱和电化学测试技术对材料的晶型结构、形貌及电化学性能等进行研究。结果表明,球磨在保持硅的晶体结构不发生变化的前提下,既可降低硅颗粒的尺寸,又能促进氧化石墨的部分还原和剥离,使其转为石墨烯。当碳纳米管添加量为1%、氧化石墨添加量为5%时,所制备的负极材料具有较好的电化学性能,在0.4 A/g的电流密度下循环200次,放电比容量为1779.7 mAh/g。这主要是因为碳纳米管和还原的氧化石墨烯能够在硅负极建立高效的导电网络,增加电子的传递速率,同时降低硅负极脱嵌锂过程时锂离子的电荷转移电阻和提高锂离子扩散速率。Carbon nanotube/reduced graphene oxide/silicon anode material was prepared using the low-cost micron silicon as the raw material by using the high-energy ball milling method which is easy to scale up and high efficiency.Scanning electron microscopy,X-ray diffraction,Fourier transform Infrared spectroscopy and electrochemical testing techniques were used to investigate the crystal structure,morphology and electrochemical properties of materials.The results show that the ball milling process can not only reduce the size of silicon particles,but also promote the partial reduction and exfoliation of graphite oxide,so that it can be transformed into graphene.When the addition of carbon nanotubes is 1%and the addition of graphite oxide is 5%,the prepared negative electrode material has good electrochemical performance.After cyclig 200 times at a current density of 0.4 A/g,a discharge specific capacity of 1779.7 mAh/g is maintained.This is mainly because carbon nanotubes and reduced graphene oxide can establish a highly efficient conductive network in the silicon anode,increasing the electron transfer rate,and at the same time,carbon nanotubes and reduced graphene oxide can reduce the charge transfer resistance of lithium ions and improve the diffusion of lithium ions during the lithium intercalation into silicon negative electrode.

关 键 词：碳纳米管 氧化石墨 硅基材料 锂离子电池 球磨法 

分 类 号：TQ127[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]