Multi-core yolk–shell-structured Bi2Se3@C nanocomposite as an anode for high-performance lithium-ion batteries

Emerging Bi2Se3-based anode materials are attracting great interest for lithium storage because of their high theoretical capacity. Although quite attractive, Bi2Se3 still faces the problem of large volume expansion during lithiation/delithiation, leading to poor cycling stability. Herein, a multi-c...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2021-08, Vol.50 (31), p.10758-10764
Main Authors: Zhu, Yaqin, Zhao, Jiachang, Li, Lanjie, Xu, Jingli, Zhao, Xinxin, Mi, Yiming, Jin, Jun
Format: Article
Language:English
Subjects:
Anode effect
Cycles
Diameters
Electrochemical analysis
Electrode materials
Heat treatment
Lithium
Lithium-ion batteries
Nanocomposites
Nanospheres
Rechargeable batteries
Shell anodes
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Summary:Emerging Bi2Se3-based anode materials are attracting great interest for lithium storage because of their high theoretical capacity. Although quite attractive, Bi2Se3 still faces the problem of large volume expansion during lithiation/delithiation, leading to poor cycling stability. Herein, a multi-core yolk–shell Bi2Se3@C nanocomposite was designed and synthesized via a solvothermal method followed by heat treatment. The as-prepared yolk–shell nanocomposite consists of two parts: several Bi2Se3 nanospheres (diameter of approximately 100 nm) as a core, and carbon (thickness of approximately 16 nm) as the shell. Owing to its unique structural features, multi-core yolk–shell Bi2Se3@C nanocomposite demonstrates excellent cycling stability with a capacity of 392.2 mA h g−1 at 0.2 A g−1 after 100 cycles for lithium-ion batteries (LIBs). A reversible capacity of 416.9 mA h g−1 can be maintained even at a higher current density of 1 A g−1 after 1200 cycles. The reason for the superior electrochemical performance was further explored through electrochemical kinetic analysis and theoretical calculations. This work provides an effective strategy for the preparation of multi-core yolk–shell anode materials, and also affords a new method by which to prepare high-performance LIBs.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt01766g