期刊
NANO ENERGY
卷 70, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104550
关键词
Anode; Layered MoS2; Low-temperature; In-situ TEM; GITT
类别
资金
- National Key Research and Development Program of China [2018YFE0124500]
- National Natural Science Foundation of China [21603162, U1804255, 51972190]
- National Science Fund for Distinguished Young Scholars [51825102]
- Tianjin Municipal Science and Technology Commission [17JCYBJC21500]
- Shenzhen Basic Research Project [JCYJ20180508152037520]
- Tianjin Municipal Major Project of New Materials [16ZXCLGX00120]
- Australian Research Council (ARC) [FL160100089]
- QUT Project [322170-0355/51]
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 degrees 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 Lithorn 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 Lithorn 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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