Double-Layer N,S-Codoped Carbon Protection of MnS Nanoparticles Enabling Ultralong-Life and High-Rate Lithium Ion Storage
Double-Layer N,S-Codoped Carbon Protection of MnS Nanoparticles Enabling Ultralong-Life and High-Rate Lithium Ion Storage
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MnS 纳米粒子的双层 N,S 共掺杂碳保护可实现超长寿命和高倍率锂离子存储
DOI：
10.1021/acsaem.8b00919
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发表时间：
2018-09-01
影响因子：
6.4
通讯作者：
Li, Cheng Chao
中科院分区：
文献类型：
--
作者：
Geng, Hongbo;Su, Hao;Li, Cheng Chao
合理合成具有长循环寿命和良好倍率性能的过渡金属硫化物是构建上级电化学储能器件的基础。本文采用原位转化法制备了具有双层碳结构的MnS纳米颗粒/N，S共掺杂碳纳米管（MnS@N，S-C NTs）。双N、S-C层和多孔结构的协同耦合效应有利于电子/锂离子的快速传输，并在充电/放电过程中保持良好的结构完整性。由于MnS@N，S-C NTs电极具有较大的比表面积，在充放电过程中主要表现为赝电容性质，有利于增强电化学转移动力学。当用作锂离子电池的阳极时，MnS@N，S-C NTs在1.0A g（-1）下在第200次循环期间表现出796 mAh g（-1）的高比容量。即使在10.0 A g（-1）下，MnS@N，S-C NT的放电比容量在第9000次循环期间仍可以达到约400 mAh g（-1），具有优异的上级倍率性能。该方法可以促进其他用于能量存储和转换的杂化功能材料的合理创建。
The rational synthesis of transition metal sulfides with long cycle life and good rate performance is essential for building superior electrochemical energy storage devices. In this work, the MnS nanoparticles/N,S-codoping carbon nanotubes (MnS@N,S-C NTs) with double-layer carbon have been synthesized through a facile in situ transformation method. The synergetic coupling effects benefited from the advantages of double N,S-C layers, and porous structures are effective to allow fast electrons/lithium ions transport and keep good structural integrity during the charging/discharging process. Owing to the large surface area, the MnS@N,S-C NTs electrode is mainly pseudocapacitive in nature during the charge-discharge process, which is beneficial to enhance the electrochemical transfer kinetics. When used as anodes for lithium ion batteries, the MnS@N,S-C NTs exhibit a high specific capacity of 796 mAh g(-1) during the 200th cycle at 1.0 A g(-1). Even at 10.0 A g(-1), the discharge specific capacity of the MnS@N,S-C NTs can still reach about 400 mAh g(-1) during the 9000th cycle with superior rate capability. The proposed approach may promote rational creation of other hybrid functional materials for energy storage and conversion.