A MoS2/Carbon hybrid anode for high-performance Li-ion batteries at low temperature. (April 2020)

• Record Type: Journal Article
• Authors: Liu, Xizheng; Wang, Yahui; Yang, Yijun; Lv, Wei; Lian, Gang; Golberg, Dmitri; Wang, Xi; Zhao, Xian; Ding, Yi
• Is Part Of: Nano energy. Volume 70(2020)
• Publication Date: 2020-04
• Subjects: Anode -- Layered MoS2 -- Low-temperature -- In-situ TEM -- GITT; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2020.104550
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: 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. Graphical abstract: Li storage performance and diffusion behaviors at low temperature in MoS2 /C composite are explored to demonstrate the key factors for a future design and fabrication of safe anodes utilized in cold climate areas and seasons. An enhanced rate performance is documented due to introduction of C. A specific point-by-point lithiation process is observed during discharging at low temperature. Image 1 Highlights: A MoS2 /C hybrid anode for high-performance Li-ion batteries at low temperature is proposed. A specific point-by-point lithiation process is observed by in-situ TEM during discharging at low temperature. The fast kinetics is associated with the introduction of C in the hybrid.