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Nano Research

Article Title

Structural engineering of sulfur-doped carbon encapsulated bismuth sulfide core-shell structure for enhanced potassium storage performance

Authors

Changlai Wang, Department of Materials Science and Engineering, Center of Super-Diamond and Advanced Films, City University of Hong Kong, Kowloon, Hong Kong, 999077, China;; Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;
Jian Lu, Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;
Huigang Tong, Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;
Shuilin Wu, Department of Materials Science and Engineering, Center of Super-Diamond and Advanced Films, City University of Hong Kong, Kowloon, Hong Kong, 999077, China;
Dongdong Wang, Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore;
Bin Liu, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;
Ling Cheng, Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;
Zhiyu Lin, Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;
Lin Hu, The Anhui High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China;
Hui Wang, The Anhui High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China;
Wenjun Zhang, Department of Materials Science and Engineering, Center of Super-Diamond and Advanced Films, City University of Hong Kong, Kowloon, Hong Kong, 999077, China;
Qianwang Chen, Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;; The Anhui High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China;

Keywords

structural engineering, potassium-ion batteries, core-shell structure, diffusion barrier, full cell

Abstract

Owing to the high theoretical capacity, metal sulfides have emerged as promising anode materials for potassium-ion batteries (PIBs). However, sluggish kinetics, drastic volume expansion, and polysulfide dissolution during charge/discharge result in unsatisfactory electrochemical performance. Herein, we design a core-shell structure consisting of an active bismuth sulfide core and a highly conductive sulfur-doped carbon shell (Bi2S3@SC) as a novel anode material for PIBs. Benefiting from its unique core-shell structure, this Bi2S3@SC is endowed with outstanding potassium storage performance with high specific capacity (626 mAhdg-1 under 50 mAdg-1) and excellent rate capability (268.9 mAhdg-1 at 1 Adg-1). More importantly, a Bi2S3@SC//KFe[Fe(CN)6] full cell is successfully fabricated, which achieves a high reversible capacity of 257 mAhdg-1 at 50 mAdg-1 over 50 cycles, holding great potentials in practical applications. Density functional theory (DFT) calculations reveal that potassium ions have a low diffusion barrier of 0.54 eV in Bi2S3 due to the weak van der Waals interactions between layers. This work heralds a promising strategy in the structural design of high-performance anode materials for PIBs.

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