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Homogeneous Intercalation Chemistry and Ultralow Strain of 1T’’’ MoS2 for Stable Potassium Storage
Authors:Miao Xie  Zhuoran Lv  Yuan Wang  Wei Zhao  Xin Pang  Chendong Zhao  Yuqiang Fang  Jian Huang  Fuqiang Huang
Affiliation:1. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai, 200050 P. R. China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences, Beijing, 100049 P. R. China;2. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai, 200050 P. R. China

College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001 P. R. China;3. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai, 200050 P. R. China

Abstract:Intercalation anodes usually exhibit better cyclability than conversion and alloying anodes for lithium or sodium storage due to the robust layered structure. However, for larger-sized potassium accommodation, these intercalation anodes usually undergo huge layer expansion and structural distortion, triggering severe capacity fading. Herein, the novel 1T’’’ MoS2 is revealed the intercalation anode for stable K+ storage, in which metallic Mo─Mo bonds and puckered S layers accelerate the charge transfer and homogeneous K+ insertion. Moreover, the ultralow strain (3.5%) induced by the non-detachable potassium ions pillar sustains the layered structure. Consequently, 1T’’’ MoS2 achieves a reversible capacity of 125 mA h g?1 at 0.2 C and keeps nearly 100% capacity retention at 1 C over 500 cycles. In situ characterizations and density functional theory simulations reveal the in-depth intercalation reaction accompanied by the MoS2 phase transformation between 1T’’’ and 1T’ during cycling. Furthermore, a 1T’’’ MoS2//MCMB K-dual ion battery displays a superior cycling lifespan with 98% capacity retention over 250 cycles. This study provides a new intercalation anode and contribute to the electrode design for stable potassium ion storage.
Keywords:1T’’’ MoS2  homogeneous ion insertion  intercalation anodes  potassium ion batteries  ultralow strain
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