Abstract Taking advantage of nano-sized active materials, doping and self-supporting, Se-doped Bi2S3/3D carbon foam (Bi2S3-xSex/CF) is synthesized through a pyrolysing-hydrothermal-heating three-steps process. The as-synthesized Bi2S3-xSex/CF hybrid exhibits a significant improvement in electrochemical performance, showing a high specific capacity of 441.8 mAh g−1 after 100 cycles with the coulombic efficiency approximating to 100%. The special nanoneedle-like structure of Bi2S3 makes for shortening ion transmission distance, minishing the mechanical stress and thus improving the electrochemical performance. And the introduction of Se can enhance the specific capacity, cycling stability and rate performance by improving of electronic conductivity and forming Se-contained inactive phase during alloying process. Furthermore, the self-supporting electrode is beneficial to simplify preparation process and reduce the loss of volume energy density. The strategy presented in this paper to improve the electrochemical performance of secondary ions battery can be also applied to other novel electrodes materials.

中文翻译：

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在三维碳泡沫上生长的 Se 掺杂 Bi2S3 纳米针作为高性能钠离子电池的自支撑阳极

摘要 利用纳米活性材料、掺杂和自支撑，通过热解-水热-加热三步法合成了Se掺杂的Bi2S3/3D泡沫碳（Bi2S3-xSex/CF）。合成的 Bi2S3-xSex/CF 杂化材料在电化学性能方面表现出显着改善，在 100 次循环后显示出 441.8 mAh g-1 的高比容量，库仑效率接近 100%。Bi2S3 的特殊纳米针状结构缩短了离子传输距离，减少了机械应力，从而提高了电化学性能。并且Se的引入可以通过提高电子电导率和在合金化过程中形成含Se的非活性相来提高比容量、循环稳定性和倍率性能。此外，自支撑电极有利于简化制备过程，减少体积能量密度的损失。本文提出的提高二次离子电池电化学性能的策略也可以应用于其他新型电极材料。