微纳米多孔Si-Ag颗粒掺杂石墨负极材料及其电性能  

Graphite Anode Material Doped with Micro-nano Porous Si-Ag Particles and its Electrical Properties

作　　者：孙斌 蔡晓兰[1] 姚耀春[1] 周蕾[1] 王磊 吴少鹏 朱晓蒙 栗文浩 SUN Bin;CAI Xiaolan;YAO Yaochun;ZHOU Lei;WANG Lei;WU Shaopeng;ZHU Xiaomeng;LI Wenhao(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093

出　　处：《有色金属工程》2021年第7期1-6,共6页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52064031);云南省自然科学基金(2018HB012);云南省基础研究重点项目(201901S070071)。

摘　　要：为解决锂离子电池石墨负极材料充放电效率低的问题,采用成本低廉的人造石墨,并掺杂微纳米多孔Si-Ag颗粒来改善石墨的导电性及提高充放电效率,利用化学刻蚀法制备了微纳米多孔Si-Ag粉体,并将70%人造石墨与30%的多孔Si-Ag粉体球磨形成夹层式复合结构。采用SEM、TEM、XRD及电池测试系统对多孔Si-Ag粉体材料进行表征和测试。结果表明:硅颗粒经高能球磨后粒径可达720 nm左右;在80℃刻蚀条件下,得到的微纳米多孔Si-Ag负极材料充放电比容量为2163.28 mAh/g;掺杂多孔Si-Ag颗粒后的石墨负极首次充放电比容量为1227.966 mAh/g,比纯石墨负极材料提高了341.1%;在0.2 C(1 C=1500 mA/g)的电流密度下,循环100次后容量保持率为59.72%。In order to solve the problem of low charge and discharge efficiency in graphite anode materials for lithium-ion batteries,low-cost artificial graphite can be used and doped with micro-nano porous Si-Ag particles to improve the conductivity of graphite and increase the efficiency of charge and discharge.The micro-nano porous Si-Ag powder is prepared via chemical etching method,and ball mill 70%artificial graphite and 30%porous Si-Ag powder to form a sandwiched composite structure.SEM,TEM,XRD and battery testing systems were used to characterize and test porous Si-Ag powder materials.According to the research results,the silicon particles have a particle size of 720 nm after high-energy ball milling;under the etching conditions of 80℃,the obtained micro-nano porous Si-Ag anode material has a charge-discharge specific capacity of 2163.28 mAh/g;doped with porous Si-The first charge and discharge specific capacity of the graphite negative electrode after Ag particles can reach 1227.966 mAh/g,which is 341.1%higher than that of pure graphite anode material;at a current density of 0.2 C(1 C=1500 mA/g),The retention rate of the capacity after 100 cycles is 59.72%.

关 键 词：化学刻蚀法 多孔硅 负极材料 锂离子电池 

分 类 号：TQ152[化学工程—电化学工业]