摘要
为了研究表面包覆碳层孔隙对石墨负极材料倍率性能的影响,引入少量硼酸,在包覆沥青软化阶段形成硼酸气化逸出效应,再通过碳化工艺在天然石墨尾料表面形成具有一定孔隙的包覆碳层,得到具有不同比例孔隙的石墨负极材料。结果表明,硼酸在材料颗粒表面形成了含有孔隙的碳层,其孔隙类型为介孔和大孔;表面碳层中的介孔比例越高,碳层L_(C)中形成Li^(+)的扩散通道数量越多,Li^(+)的扩散阻抗越低,材料倍率性能及循环性能得以改善。
In order to study the effects of pores in surface-coated carbon layer on the rate performance of graphite cathode materials,a small amount of boric acid was added to generate gasification and effusion effect of boric acid during the softening stage of the coated asphalt.Then,a carbon layer with certain pores was formed on the surface of natural graphite tailings through carbonization,and graphite cathode materials with various proportions of pores were obtained.The results show that boric acid forms a carbon layer on the surface of particles containing mesoporous and macroporous pores.A higher proportion of mesopores in the surface carbon layer leads to more diffusion channels for Li^(+)in the carbon layer L_(C),and lower diffusion impedance of Li^(+).In that case,the rate performance and cycling performance of the material are enhanced.
作者
刘云峰
谭婷
杨乐之
银华杰
梁帆
王双
罗磊
涂飞跃
LIU Yunfeng;TAN Ting;YANG Lezhi;YIN Huajie;LIANG Fan;WANG Shuang;LUO Lei;TU Feiyue(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China)
出处
《矿冶工程》
CAS
北大核心
2024年第1期129-133,共5页
Mining and Metallurgical Engineering
基金
国家重点研发计划(2020YFC1909604)。
关键词
锂离子电池
石墨负极
天然石墨尾料
硼酸
沥青
碳层结构
碳化工艺
负极材料
循环性能
lithium-ion batteries
graphite cathode
natural graphite tailings
boric acid
asphalt
carbon layer structure
carbonization process
cathode material
cyclic performance
作者简介
刘云峰(1982-),男,河北新乐人,主要研究方向为石墨尾料高值化利用研究、硅基负极材料开发研究。E⁃mail:liuyunfeng120@163.com;通信作者:杨乐之(1983-),男,湖南常德人,博士,高级工程师,硕士研究生导师,主要研究方向为新能源材料与器件。E⁃mail:yanglezhi@hotmail.com。
