材料科学
阳极
动力学
扩散
电化学
电极
化学工程
插层(化学)
电流密度
透射电子显微镜
碳纤维
电化学动力学
锂(药物)
离子
分析化学(期刊)
复合数
纳米技术
无机化学
复合材料
物理化学
热力学
化学
内分泌学
医学
工程类
物理
量子力学
有机化学
色谱法
作者
Xizheng Liu,Yahui Wang,Yijun Yang,Wei Lv,Gang Lian,Dmitri Golberg,Xi Wang,Xian Zhao,Yi Ding
出处
期刊:Nano Energy
[Elsevier]
日期:2020-04-01
卷期号:70: 104550-104550
被引量:110
标识
DOI:10.1016/j.nanoen.2020.104550
摘要
Traditional lithium-ion batteries (LIBs) suffer from tremendous electrochemical performance fading at low temperatures (LT). This work reports a novel MoS2/C hybrid electrode that shows excellent LT performance as LIB anodes. At −20 °C, it delivers a stable discharge capacity as high as 854.3 mAh g−1 which is 72.8% of that at room temperature (RT). At a current density of 3 A g−1, a capacity of 140.9 mAh g−1 can still be achieved. The enlarged MoS2 interlayer spacing favors the fast Li+ diffusion, which in turn improves the lithiation/delithiation kinetics and the rate performance at LT. In-situ transmission electron microscopy (TEM) and galvanostatic intermittent titration technique (GITT) showed the fast Li+ diffusion kinetics at LT and the lithiation experiences a domain-by-domain reaction process, that is a multistep insertion-conversion reaction started from the outside domains to the neighboring inside domains, which is markedly different from that the two-step insertion-conversion process occurs at RT. Our results enrich the understanding of Li intercalation and diffusion kinetics of MoS2-based materials and provide a material design strategy for high-performance LIBs suitable for cold climate environment.
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