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封装在少层石墨烯中的新型二维层状二碲化钼作为锂离子电池的高性能阳极

Novel 2D Layered Molybdenum Ditelluride Encapsulated in Few-Layer Graphene as High-Performance Anode for Lithium-Ion Batteries.

作者信息

Ma Ning, Jiang Xiao-Yu, Zhang Lu, Wang Xiao-Shuang, Cao Yu-Liang, Zhang Xian-Zheng

机构信息

Department of Chemistry, Wuhan University, Wuhan, 430072, P. R. China.

Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan, 430072, China.

出版信息

Small. 2018 Apr;14(14):e1703680. doi: 10.1002/smll.201703680. Epub 2018 Feb 28.

DOI:10.1002/smll.201703680
PMID:29488317
Abstract

Molybdenum ditelluride nanosheets encapsulated in few-layer graphene (MoTe /FLG) are synthesized by a simple heating method using Te and Mo powder and subsequent ball milling with graphite. The as-prepared MoTe /FLG nanocomposites as anode materials for lithium-ion batteries exhibit excellent electrochemical performance with a highly reversible capacity of 596.5 mAh g at 100 mA g , a high rate capability (334.5 mAh g at 2 A g ), and superior cycling stability (capacity retention of 99.5% over 400 cycles at 0.5 A g ). Ex situ X-ray diffraction and transmission electron microscopy are used to explore the lithium storage mechanism of MoTe . Moreover, the electrochemical performance of a MoTe /FLG//0.35Li MnO ·0.65LiMn Ni O full cell is investigated, which displays a reversible capacity of 499 mAh g (based on the MoTe /FLG mass) at 100 mA g and a capacity retention of 78% over 50 cycles, suggesting the promising application of MoTe /FLG for lithium-ion storage. First-principles calculations exhibit that the lowest diffusion barrier (0.18 eV) for lithium ions along pathway III in the MoTe layered structure is beneficial for improving the Li intercalation/deintercalation property.

摘要

通过使用碲(Te)粉和钼(Mo)粉的简单加热方法以及随后与石墨进行球磨,合成了包裹在少层石墨烯中的二碲化钼纳米片(MoTe₂/FLG)。所制备的MoTe₂/FLG纳米复合材料作为锂离子电池的负极材料,在100 mA g⁻¹ 时表现出优异的电化学性能,具有596.5 mAh g⁻¹ 的高可逆容量、高倍率性能(在2 A g⁻¹ 时为334.5 mAh g⁻¹)以及优异的循环稳定性(在0.5 A g⁻¹ 下400次循环后容量保持率为99.5%)。采用非原位X射线衍射和透射电子显微镜来探究MoTe₂的储锂机制。此外,还研究了MoTe₂/FLG//0.35Li₂MnO₃·0.65LiMn₁/₃Ni₂/₃O₂全电池的电化学性能,该全电池在100 mA g⁻¹ 时显示出499 mAh g⁻¹(基于MoTe₂/FLG质量)的可逆容量,在50次循环后容量保持率为78%,这表明MoTe₂/FLG在锂离子存储方面具有广阔的应用前景。第一性原理计算表明,锂离子在MoTe₂层状结构中沿路径III的最低扩散势垒(0.18 eV)有利于改善锂的嵌入/脱嵌性能。

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