In-situ growth of binder-free hierarchical carbon coated CoSe2 as a high performance lithium ion battery anode
In-situ growth of binder-free hierarchical carbon coated CoSe2 as a high performance lithium ion battery anode
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DOI：
10.1016/j.apsusc.2019.03.258
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发表时间：
2019-07
影响因子：
6.7
通讯作者：
N. Yu;Li-xia Zou;Chong Li;Kai-min Guo
中科院分区：
文献类型：
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作者：
N. Yu;Li-xia Zou;Chong Li;Kai-min Guo
过渡金属硒化物被认为是锂离子电池的有前途的材料，但仍然面临着很大的挑战，包括较差的倍率性能和不理想的循环稳定性。本文合理设计并合成了用于锂离子电池的柔性分层碳包覆cose2电极，该电极具有638.3 mAh/g的高容量，具有良好的倍率性能，并且在100次 循环后具有100%的优异循环稳定性。这种令人印象深刻的电化学性能归功于无粘结剂的纳米结构电极结构和碳涂层，这不仅大大提高了电导率，而且减轻了锂化/衰减过程中的体积膨胀/收缩。这项工作为开发基于转换材料的高性能锂离子电池电极提供了良好的案例。
Transition metal selenides have been regarded as promising materials for lithium ion batteries but still face great challenges, including poor rate performance and unsatisfactory cycling stability. Herein, flexible hierarchical carbon coated CoSe2electrode was rationally designed and synthesized for LIBs and demonstrates a high capacity of 638.3 mAh/g, very good rate capability, and excellent cycling stability of 100% after 100 cycles. The impressive electrochemical performance is attributed to the binder-free nanostructured electrode architecture and the carbon coating, which not only highly improves the electric conductivity but also alleviates the volumetric expansion/shrinkage during lithiation/delithiation. This work displays a good case for developing high performance lithium ion battery electrodes based on conversion materials.