Defective 1T′-ReSe2 nanosheets vertically grown on elastic MXene for fast and stable potassium ion storage

• Published in: Science China materials Vol. 65; no. 12; pp. 3418 - 3427
• Main Authors: Zhou, Jianwen, Zhang, Yelong, Liu, Zheng, Qiu, Zhenping, Wang, Da, Zeng, Qingguang, Yang, Chao, Hui, Kwun Nam, Yang, Yong, Peng, Zhangquan, Guo, Shaojun
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.12.2022; Springer Nature B.V
• Subjects: Anodes; Chemistry and Materials Science; Chemistry/Food Science; Interlayers; Ion adsorption; Ion storage; Materials Science; MXenes; Nanosheets; Potassium; Reaction kinetics; Rechargeable batteries; Superstructures; Synergistic effect; Tellurium; Transition metal compounds; potassium-ion batteries; rhenium diselenide; MXene; Te-doped
• ISSN: 2095-8226; 2199-4501
• DOI: 10.1007/s40843-022-2073-y

The sluggish reaction kinetics and poor structure stability of transition metal dichalcogenides (TMDs)-based anodes in potassium-ion batteries (KIBs) usually cause limited rate performance and rapid capacity decay, which seriously impede their application. Herein, we report a vacancy engineering strategy for preparing a class of Te-doped 1T’-ReSe 2 anchored onto MXene (Te-ReSe 2 /MXene) as an advanced anode for KIBs with high performance. By taking advantage of the synergistic effects of the defective Te-ReSe 2 arrays with expanded interlayers and the elastic MXene nanosheets with self-autoadjustable function, the Te-ReSe 2 /MXene superstructure exhibits boosted K + ion storage performance, in terms of high reversible capacity (361.1 mA h g −1 at 0.1 A g −1 over 200 cycles), excellent rate capability (179.3 mA h g −1 at 20 A g −1 ), ultra-long cycle life (202.8 mA h g −1 at 5 A g −1 over 2000 cycles), and steady operation in flexible full battery, presenting one of the best performances among the TMDs-based anodes reported thus far. The kinetics analysis and theoretical calculations further indicate that satisfactory pseudocapacitive property, high electronic conductivity and outstanding K + ion adsorption/diffusion capability corroborate the accelerated reaction kinetics. Especially, structural characterizations clearly elaborate that the Te-ReSe 2 /MXene undergoes reversible evolutions of an initial insertion process followed by a conversion reaction.