期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 874, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159859
关键词
Lithium-ion batteries; Sb2Se3 anode; Carbon encapsulation; Alloying/conversion; Nanocomposite
资金
- Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 21202014]
- City University of Hong Kong [PJ7005080, PJ9678150]
This study focuses on enhancing the long-term stability and reversibility of Sb2Se3 as anode material for lithium-ion batteries. The addition of acetylene black to form Sb2Se3/C nanocomposite material helps reduce volume change and improve cycle performance, achieving a capacity retention of 99.3% after 1000 cycles. A full cell with LiFePO4 cathode and Sb2Se3/C anode shows a stable capacity of 340 mAh g(-1) after 300 cycles.
Metal chalcogenides undergoing alloying and conversion mechanism can give high capacity as anode for lithium-ion batteries. However, large volume change and phase segregation lead to poor cycle performance. In this study, we focus on Sb2Se3 and develop methods to enhance its long-term stability and reversibility. In particular, we find that carbon encapsulation reduces volume change during lithiation/delithiation and facilitates the recombination process of Sb and Se even after long cycling. With an addition of 20 wt% acetylene black, the Sb2Se3/C nanocomposite material exhibits an excellent cycle performance with a charge capacity of 545 mAh g(-1) at 250 mA g(-1) after 1000 cycles, corresponding to a capacity retention of 99.3%. We also demonstrate a full cell with LiFePO4 cathode and Sb2Se3/C anode that is capable of delivering a stable capacity of 340 mAh g(-1) at 1 A g(-1) (about 3 C rate) after 300 cycles. (c) 2021 Elsevier B.V. All rights reserved.
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