Hu Le, Shang Chaoqun, Akinoglu Eser Metin, Wang Xin, Zhou Guofu
National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China.
International Academy of Optoelectronics at Zhaoqing, South China Normal University, Zhaoqing 526060, China.
Nanomaterials (Basel). 2020 Feb 10;10(2):302. doi: 10.3390/nano10020302.
CuSe with high theoretical capacity and good electronic conductivity have attracted particular attention as anode materials for sodium ion batteries (SIBs). However, during electrochemical reactions, the large volume change of CuSe results in poor rate performance and cycling stability. To solve this issue, nanosized-CuSe is encapsulated in 1D nitrogen-doped carbon nanofibers (CuSe-NC) so that the unique structure of 1D carbon fiber network ensures a high contact area between the electrolyte and CuSe with a short Na diffusion path and provides a protective matrix to accommodate the volume variation. The kinetic analysis and D calculation indicates that the dominant contribution to the capacity is surface pseudocapacitance with fast Na migration, which guarantees the favorable rate performance of CuSe-NC for SIBs.
具有高理论容量和良好电子导电性的硒化铜作为钠离子电池（SIBs）的负极材料受到了特别关注。然而，在电化学反应过程中，硒化铜的大体积变化导致倍率性能和循环稳定性较差。为了解决这个问题，纳米尺寸的硒化铜被封装在一维氮掺杂碳纳米纤维（CuSe-NC）中，一维碳纤维网络的独特结构确保了电解质与硒化铜之间有高接触面积以及短的钠扩散路径，并提供了一个保护基体来适应体积变化。动力学分析和D计算表明，对容量的主要贡献是具有快速钠迁移的表面赝电容，这保证了CuSe-NC用于SIBs时良好的倍率性能。
