摘要
过渡金属硒化物作为最具潜力的锂离子电池材料受广泛关注,然而,它仍存在导电性低,嵌锂脱锂过程中体积变化大等问题。为此,本研究设计和合成自支撑层状碳包覆CoSe2(CoSe2@C),并将它应用于锂离子电池具有很高的容量626mAh/g,很好的倍率容量,优异的循环稳定性(循环50圈)。良好的电化学性能归功于电极的设计和碳包覆,其不仅仅能提高电极的电导性也能减小在嵌锂/脱锂过程中材料的体积变化。该工作为开发基于转换材料的高性能锂离子电池的电极提供了一个很好的案例。
Tansition metal selenides have been regarded as promising materials for lithium ion batteries(LIBs)but still faces great challenge.Herein,free-standing hierarchical carbon coated CoSe 2(CoSe 2@C)were rationally designed and synthesized for lithium ion batteries and demonstrates a high capacity of 626 mAh/g,good rate capability,and excellent cycling stability after 50 cycles.The impressive electrochemical performance is attributed to the binder-free electrode design and the carbon coating,which not only highly improves the electric conductivity but also alliveates the volumetric expansion/shrinkage during lithiation/delithiation.This work displays a good case for developing high performance LIB electrodes based on conversion materials.
作者
喻能
郭凯
那兵
YU Neng;GUO Kai;NA Bing(Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices,Nanchang 330013,China;School of Chemistry,Biological and Materials Sciences,East China University of Technology,Nanchang 330013,China)
出处
《东华理工大学学报（自然科学版）》
CAS
2020年第6期579-584,共6页
Journal of East China University of Technology(Natural Science)
基金
国家自然科学基金项目(5170204)
江西省教育厅科学技术研究项目(GJJ170429,GJJ170431)
东华理工大学博士科研启动基金(DHBK2017169,DHBK2017)。
