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

被引:33
|
作者
Wang, Changlai [1 ,2 ]
Lu, Jian [2 ]
Tong, Huigang [2 ]
Wu, Shuilin [1 ]
Wang, Dongdong [4 ]
Liu, Bin [5 ]
Cheng, Ling [2 ]
Lin, Zhiyu [2 ]
Hu, Lin [3 ]
Wang, Hui [3 ]
Zhang, Wenjun [1 ]
Chen, Qianwang [2 ,3 ]
机构
[1] City Univ Hong Kong, Ctr Super Diamond & Adv Films, Dept Mat Sci & Engn, Kowloon, Hong Kong 999077, Peoples R China
[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
[3] Chinese Acad Sci, Hefei Inst Phys Sci, Anhui High Magnet Field Lab, Hefei 230031, Peoples R China
[4] Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, 21 Nanyang Link, Singapore 637371, Singapore
[5] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
关键词
structural engineering; potassium-ion batteries; core-shell structure; diffusion barrier; full cell; ION BATTERIES; LONG-LIFE; ANODES; CHALLENGES; COMPOSITE; SYSTEMS; LITHIUM; NANOROD; BI2S3;
D O I
10.1007/s12274-021-3560-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 mAh.g(-1) under 50 mA.g(-1)) and excellent rate capability (268.9 mAh.g(-1) at 1 A.g(-1)). More importantly, a Bi2S3@SC//KFe[Fe(CN)(6)] full cell is successfully fabricated, which achieves a high reversible capacity of 257 mAh.g(-1) at 50 mA.g(-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.
引用
收藏
页码:3545 / 3551
页数:7
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