Few-Layer MXenes Delaminated via High-Energy Mechanical Milling for Enhanced Sodium-Ion Batteries Performance
Few-Layer MXenes Delaminated via High-Energy Mechanical Milling for Enhanced Sodium-Ion Batteries Performance
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通过高能机械研磨分层多层 MXene，以增强钠离子电池性能
DOI：
10.1021/acsami.7b12155
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发表时间：
2017
影响因子：
9.5
通讯作者：
Zhang Xiaogang
中科院分区：
文献类型：
--
作者：
Wu Yuting;Nie Ping;Wang Jiang;Dou Hui;Zhang Xiaogang
钠的全球可用性使得对能量存储应用的上级钠离子电池的探索具有吸引力。MXenes作为最有前途的钠离子电池阳极之一，已被报道具有许多优点，例如高电子电导率和亲水表面。然而，紧凑的多层结构和不足的分层显著抑制了它们的应用，需要高能量并且显示出降低的存储容量和差的倍率性能。少层MXene具有良好的离子导电性和二维层状结构，具有上级电化学性能。在本文中，我们报告了作为钠离子电池阳极的少层MXene纳米片的规模分层，其通过有机溶剂辅助高能机械研磨方法制备。这种方法有效地防止了MXene的氧化，并产生了少层纳米片结构，促进了快速的电子传输和Na+扩散。电化学测试表明，少层MXenes具有高的比容量、优异的循环稳定性和良好的倍率性能。具体来说，少层MXene纳米片在0.1 A g-1的电流密度下可提供267 mA h g-1的高可逆容量。在1A g-1的高倍率下循环1500次后，其可逆容量仍保持在76 mA h g-1。
The global availability of sodium makes the exploration of superior sodium-ion batteries attractive for energy storage application. MXenes, as one of the most promising anodes for sodium-ion batteries, have been reported to have many advantages, such as high electronic conductivity and a hydrophilic surface. However, the compact multilayer structure and deficient delamination significantly inhibits their application, requiring high energy and showing decreased storage capacity and poor rate capabilities. Few-layer MXene has been proved to benefit superior electrochemical properties with a better ionic conductivity and two-dimensional layer structure. Herein, we report scale delamination of few-layer MXene nanosheets as anodes for sodium-ion batteries, which are prepared via an organic solvent assist high-energy mechanical-milling method. This approach efficiently prevents the oxidation of MXene and produces few-layer nanosheets structure, facilitating fast electron transport and Na+diffusion. Electrochemical tests demonstrate that the few-layer MXenes show high specific capacity, excellent cycle stability, and good rate performance. Specifically, few-layer MXene nanosheets deliver a high reversible capacity of 267 mA h g–1at a current density of 0.1 A g–1. After cycling 1500 cycles at a high rate of 1 A g–1, a reversible capacity of 76 mA h g–1could be maintained.