Developing suitable electrode materials capable of tolerating severe structural deformation and overcom-ing sluggish reaction kinetics resulting from the large radius of potassium ion(K+)insertion is critical for practical applications of potassium-ion batteries(PIBs).Herein,a superior anode material featuring an intriguing hierarchical structure where assembled MoSSe nanosheets are tightly anchored on a highly porous micron-sized carbon sphere and encapsulated within a thin carbon layer(denoted as Cs@MoSSe@C)is reported,which can significantly boost the performance of PIBs.The assembled MoSSe nanosheets with expanded interlayer spacing and rich anion vacancy can facilitate the intercala-tion/deintercalation of K+and guarantee abundant active sites together with a low K+diffusion barrier.Meanwhile,the thin carbon protective layer and the highly porous carbon sphere matrix can alleviate the volume expansion and enhance the charge transport within the composite.Under these merits,the as-prepared Cs@MoSSe@C anode exhibits a high reversible capacity(431.8 mAh g-1 at 0.05 A g-1),good rate capability(161 mAh g-1 at 5 A g-1),and superior cyclic performance(70.5％capacity retention after 600 cycles at 1 A g-1),outperforming most existing Mo-based S/Se anodes.The underlying mechanisms and origins of superior performance are elucidated by a set of correlated in-situ/ex-situ characterizations and theoretical calculations.Further,a PIB full cell based on Cs@MoSSe@C anode also exhibits an impres-sive electrochemical performance.This work provides some insights into developing high-performance PIBs anodes with transition-metal chalcogenides.

Mengting Cai;Hehe Zhang;Yinggan Zhang;Bensheng Xiao;Lei Wang;Miao Li;Ying Wu;Baisheng Sa;Honggang Liao;Li Zhang;Shuangqiang Chen;Dong-Liang Peng;Ming-Sheng Wang;Qiaobao Zhang

Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,China;Department of Chemical Engineering,School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China;School of Materials and Energy,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Eco-materials Advanced Technology,College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China;College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China;Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM),Xiamen 361005,China

科学通报（英文版）

[1]Mengting Cai;Hehe Zhang;Yinggan Zhang;Bensheng Xiao;Lei Wang;Miao Li;Ying Wu;Baisheng Sa;Honggang Liao;Li Zhang;Shuangqiang Chen;Dong-Liang Peng;Ming-Sheng Wang;Qiaobao Zhang-.Boosting the potassium-ion storage performance enabled by engineering of hierarchical MoSSe nanosheets modified with carbon on porous carbon sphere)[J].科学通报（英文版）,2022(09):933-945

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