标题:A MoS2/Carbon hybrid anode for high-performance Li-ion batteries at low temperature
作者:Liu X.; Wang Y.; Yang Y.; Lv W.; Lian G.; Golberg D.; Wang X.; Zhao X.;等
作者机构:[Liu, X] Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials and Low-Carbon Technologies, School of Mat 更多
通讯作者:Lv, W(lv.wei@sz.tsinghua.edu.cn)
通讯作者地址:[Lv, W] Tsinghua Shenzhen International Graduate School, Tsinghua UniversityChina;
来源:Nano Energy
出版年:2020
卷:70
DOI:10.1016/j.nanoen.2020.104550
关键词:Anode; GITT; In-situ TEM; Layered MoS2; Low-temperature
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. © 2020 Elsevier Ltd
收录类别:SCOPUS
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85078705933&doi=10.1016%2fj.nanoen.2020.104550&partnerID=40&md5=f4bde3359e66a87dae52b0b47c515c4a
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