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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.
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页码:3545 / 3551
页数:7
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