High-rate cathode CrSSe based on anion reactions for lithium-ion batteries

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 8; no. 48; pp. 25739 - 25745
• Main Authors: Yang, Si-Yu, Shi, Ding-Ren, Wang, Tian, Yue, Xin-Yang, Zheng, Lei, Zhang, Qing-Hua, Gu, Lin, Yang, Xiao-Qing, Shadike, Zulipiya, Li, Hong, Fu, Zheng-Wen
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.01.2020
• Subjects: Batteries; Cathodes; Chromium; Fire hazards; Lithium; Lithium-ion batteries; Raman spectroscopy; Rechargeable batteries; Transition metal compounds
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d0ta08012h

Studies of transition metal dichalcogenides (TMDs) can be traced back to the 1970s but they have been abandoned for a while due to the fire hazard of lithium metal batteries. Herein, a new layered material, CrSSe, is reported, whose intercalative capacity can achieve 190 mA h g −1 with charges all compensated by anionic S and Se. Fascinating performances of half-cells are also presented, with a capacity retention rate of 81.5% upon 1000 cycles at 20C and a high output of 101.7 mA h g −1 even at 200C. In addition, an ideal way to build a type of full battery without lithium anodes for CrSSe is also displayed; a Li 3 N film was synthesized on the electrode surface as a lithium source. Overall, the discovery of CrSSe enriches the chemistry of TMDs and the application in full batteries opens up opportunities for enabling lithium-free cathodes to be widely utilized in practical applications. CrSSe is a novel layered electrode material based on anionic reactions of S and Se. And a new type of lithium-ion battery is fabricated when paired with soft carbon, in which Li 3 N film was in situ generated on the electrode surface as the sole lithium source.