材料科学
纳米晶材料
锂(药物)
相(物质)
储能
纳米技术
电化学
上部结构
相变
电池(电)
透射电子显微镜
纳米晶
化学工程
纳米尺度
电极
热力学
化学
物理化学
内分泌学
工程类
功率(物理)
物理
有机化学
医学
作者
Kai Leng,Zhongxin Chen,Xiaoxu Zhao,Wei Tang,Bingbing Tian,Chang Tai Nai,Wu Zhou,Kian Ping Loh
出处
期刊:ACS Nano
[American Chemical Society]
日期:2016-09-28
卷期号:10 (10): 9208-9215
被引量:211
标识
DOI:10.1021/acsnano.6b05746
摘要
Achieving homogeneous phase transition and uniform charge distribution is essential for good cycle stability and high capacity when phase conversion materials are used as electrodes. Herein, we show that chemical lithiation of bulk 2H-MoS2 distorts its crystalline domains in three primary directions to produce mosaic-like 1T′ nanocrystalline domains, which improve phase and charge uniformity during subsequent electrochemical phase conversion. 1T′-LixMoS2, a macroscopic dense material with interconnected nanoscale grains, shows excellent cycle stability and rate capability in a lithium rechargeable battery compared to bulk or exfoliated-restacked MoS2. Transmission electron microscopy studies reveal that the interconnected MoS2 nanocrystals created during the phase change process are reformable even after multiple cycles of galvanostatic charging/discharging, which allows them to play important roles in the long term cycling performance of the chemically intercalated TMD materials. These studies shed light on how bulk TMDs can be processed into quasi-2D nanophase material for stable energy storage.
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