In situ reactive coating of metallic and selenophilic Ag(2)Se on Se/C cathode materials for high performance Li-Se batteries.
In situ reactive coating of metallic and selenophilic Ag(2)Se on Se/C cathode materials for high performance Li-Se batteries.
复制标题
用于高性能锂硒电池的 Se/C 正极材料上金属和亲硒 Ag2Se 的原位反应涂层
DOI：
10.1039/c8ra06484a
复制
发表时间：
2018-09-18
期刊：
影响因子：
3.9
通讯作者：
Zhou, Lang
中科院分区：
文献类型：
--
作者：
Sun, Fugen;Li, Yahui;Wu, Zilong;Liu, Yu;Tang, Hao;Li, Xiaomin;Yue, Zhihao;Zhou, Lang
基于硒与AgNO3在环境条件下的原位氧化还原反应，成功地在Se/氮掺杂的介孔碳复合材料上制备了一种金属亲硒性Ag2Se涂层。Ag2Se在Se上的原位反应生长确保了Ag2Se涂层对Se的完全包封，这使得Ag2Se涂层具有物理包封和化学结合的双重作用，有效地将多硒化物中间体限制在阴极内。在氮掺杂碳的介孔约束下，ag2se包覆的Se/氮掺杂介孔碳复合材料的电化学性能得到了显著改善，初始放电容量高达652 mA h g−1，库仑效率高达95.4%，循环100次后的可逆容量高达382 mA h g−1。这些令人鼓舞的结果表明，在硫基（如S， Se和Te）电极材料上原位反应构建金属和亲硫涂层应该是一种很有前途的、易于扩展的锂电池实际应用的方法，因为所涉及的原位反应过程非常简单。开发了一种简便的方法，在高性能锂硒电池的Se/介孔碳上原位涂覆金属和亲硒性Ag2Se。
A facile methodology to fabricate a metallic and selenophilic Ag2Se coating on a Se/nitrogen-doped mesoporous carbon composite, has been successfully developed based on the in situ redox reaction between Se and AgNO3 under ambient conditions. The in situ reactive growth of Ag2Se on Se ensures the complete encapsulation of Se by the Ag2Se coating, which endows the Ag2Se coating with the dual effects of physical entrapment and chemical binding to effectively confine polyselenide intermediates within the cathodes. With the further assistance of mesopore confinement of the nitrogen-doped carbons, the Ag2Se-coated Se/nitrogen-doped mesoporous carbon composites present much improved electrochemical performances with a high initial discharge capacity of 652 mA h g−1, a high coulombic efficiency of 95.4% and a high reversible capacity of 382 mA h g−1 after 100 cycles. These encouraging results suggest that the in situ reactive construction of metallic and chalcogenophilic coating layers on the chalcogen (e.g. S, Se and Te)-based electrode materials should be a promising and easy to scale-up method for practical applications of lithium batteries in light of the very simple in situ reaction processes involved. A facile methodology has been developed to in situ coat metallic and selenophilic Ag2Se on Se/mesoporous carbons for high-performance Li–Se batteries.
登录
查看更多内容
影响因子：
10.9
作者：
Hong, Young Jun;Kang, Yun Chan
通讯作者：
Kang, Yun Chan
影响因子：
17.1
作者：
Luo, Chao;Xu, Yunhua;Wang, Chunsheng
通讯作者：
Wang, Chunsheng
独立式空心双壳Se@CNx纳米带作为锂硒电池的大容量高倍率正极
影响因子：
17.6
作者：
Cai, Qifa;Li, Yuanyuan;Chu, Paul K.
通讯作者：
Chu, Paul K.
影响因子：
9.2
作者：
He, Jiarui;Lv, Weiqiang;He, Weidong
通讯作者：
He, Weidong
导电多孔氮化钒/石墨烯复合材料作为锂硫电池多硫化物化学锚
影响因子：
16.6
作者：
Sun Z;Zhang J;Yin L;Hu G;Fang R;Cheng HM;Li F
通讯作者：
Li F