Synthesis of three-dimensional free-standing WSe2/C hybrid nanofibers as anodes for high-capacity lithium/sodium ion batteries. Issue 34 (14th August 2019)

• Record Type: Journal Article
• Authors: Li, Jing; Han, Shaobo; Zhang, Junwei; Xiang, Junxiang; Zhu, Xingqun; Liu, Ping; Li, Xuefeng; Feng, Chao; Xiang, Bin; Gu, Meng
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 34(2019)
• Page Start: 19898
• Page End: 19908
• Publication Date: 2019-08-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta06199a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A flexible three-dimensional WSe2 /C nanofiber was reported and investigated by the in situ TEM, which finally exhibited high reversible cycling capability and ultra-long lifespan up to 10 000 cycles at ultrahigh rate. Abstract : In recent years, although there has been great progress in the exploration of high capacity alkali metal ion batteries, the design of high-durable anode materials with high power density remains challenging. In this study, a flexible three-dimensional network of WSe2 /C is reported as a dual-role anode for lithium/sodium ion batteries, providing multichannels for the fast lithium/sodium ion diffusion and a buffer matrix to restrain the volume change as well as increase the electron conductivity. The in situ transmission electron microscopy characterizations reveal a minor volume expansion of the WSe2 /C (∼8.2%) and a complete-amorphization event occurring after the first lithiation process. WSe2 /C exhibited superior reversible capacity/rate capability/cycling stability in lithium/sodium ion batteries. Particularly, a large stable capacity and ultra-long cycling life at ultra-high rate (257.0 mA h g −1 at 25 A g −1 after 10 000 cycles) are achieved for the WSe2 /C electrode in lithium ion batteries, accompanied by only 0.5% capacity loss per cycle over 1000 cycles, which reveals its excellent capacity stability at ultra-high rates. This study reveals the great potential of WSe2 /C as a high-capacity dual-role anode for lithium/sodium ions batteries.