Hybrid Energy Storage Mechanisms for Sulfur-Decorated Ti3C2 MXene Anode Material for High-rate and Long-life Sodium-ion Batteries
Hybrid Energy Storage Mechanisms for Sulfur-Decorated Ti3C2 MXene Anode Material for High-rate and Long-life Sodium-ion Batteries
复制标题
用于高倍率、长寿命钠离子电池的硫修饰 Ti3C2 MXene 负极材料的混合储能机制
DOI：
10.1016/j.cej.2019.01.185
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发表时间：
2019
影响因子：
15.1
通讯作者：
Songping Wu
中科院分区：
文献类型：
--
作者：
Shuijing Sun;Zhenlang Xie;Yurong Yan;Songping Wu
硫修饰的Ti3C2MXenes是通过静电吸引的溶液浸渍方法合成的，在钠柱撑和硫修饰的二维MXenes中间层中出现了更多来自硫基团的钠存储情况和更快的钠扩散路径。硫磺修饰的Ti3C2Mxene作为钠离子电池负极材料，在2 A g−1的大电流密度下1000次循环后的可逆容量为135 mAhg−1，平均容量损失率为0.033%，倍率性能为136.6 mAh1 at 5 A g−1。优异的电化学性能归因于独特的二维硫修饰Ti3C2Mxenes、自增强动力学和混合储能机制，即插层伪电容和表面控制伪电容。这些特性使得硫磺修饰的Ti3C2MXene有望成为钠离子电池的长期高倍率负极材料。
Sulfur-decorated Ti3C2MXenes are synthesizedviasolution soaking method with electrostatic attraction, whereby more sodium-storage situations derived from sulfur groups and more rapid sodium diffusion paths have appeared in sodium-pillared and sulfur-decorated two-dimensional MXenes interlayers. As an anode material for sodium ion battery, sulfur-decorated Ti3C2MXene renders an impressive reversible capacity of 135 mAh g−1at a high current density of 2 A g−1after 1000 cycles, with a low average capacity loss of 0.033% per cycle, and a superior rate capability of 136.6 mAh g−1at 5 A g−1. The excellent electrochemical performance can be ascribed to distinctive two-dimensional sulfur-decorated Ti3C2MXenes, self-enhanced kinetic and hybrid energy storage mechanisms,i.e.,intercalation pseudocapacitance and surface-controlled pseudocapacitance. These attributes enable sulfur-decorated Ti3C2MXene to be a promising long-term and high-rate anode material for sodium-ion battery.