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表面包覆碳层孔隙对石墨负极材料倍率性能的影响

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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LC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.
Effects of Pores in Surface-Coated Carbon Layer on Rate Performance of Graphite Cathode Materials
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 LC,and lower diffusion impedance of Li+.In that case,the rate performance and cycling performance of the material are enhanced.

lithium-ion batteriesgraphite cathodenatural graphite tailingsboric acidasphaltcarbon layer structurecarbonization processcathode materialcyclic performance

刘云峰、谭婷、杨乐之、银华杰、梁帆、王双、罗磊、涂飞跃

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长沙矿冶研究院有限责任公司,湖南长沙 410012

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

国家重点研发计划

2020YFC1909604

2024

矿冶工程
长沙矿冶研究院有限责任公司 中国金属学会

矿冶工程

CSTPCD北大核心
影响因子:1.137
ISSN:0253-6099
年,卷(期):2024.44(1)
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