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Facile synthesis of binder-free CuSe as a long-cycling anode for sodium batteries: Self-healing metal selenide anode for sodium batteries

Authors
Kim, HuihunKim, Tae-hongCho, Gyu-BongRyu, Ho-SukAhn, Jou-HyeonCho, Kwon-KooAhn, Hyo-Jun
Issue Date
Jan-2024
Publisher
Elsevier Ltd
Keywords
Copper selenide (CuSe) anode; Degradation; High rate; Long cycle life; Pulverisation; Self-healing; Sodium ion battery
Citation
Journal of Energy Storage, v.76
Indexed
SCOPUS
Journal Title
Journal of Energy Storage
Volume
76
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/68606
DOI
10.1016/j.est.2023.109848
ISSN
2352-152X
2352-1538
Abstract
Owing to their high capacity and electrical conductivity, transition metal selenides have attracted attention as anodes for sodium batteries. In this study, CuSe was synthesised using a simple and scalable process that involved heating Se powder on a Cu current collector at 140 °C for 5 h. Furthermore, CuSe was used as an anode without a binder or conducting agent, exhibiting a stable capacity during long cycles. The initial capacity of the CuSe electrode was 289 mAh g−1 at 15 A g−1, which reduced to 89.2 % of the initial value after 10,000 cycles. During cycling, the CuSe particles were cleaved and pulverised into nanoparticles, which subsequently agglomerated to form a porous structure without capacity loss. This phenomenon is known as self-healing. Because pulverised CuSe exhibits optimal cycling properties, pulverisation does not cause poor cycling and can be overcome through self-healing. This study is the first to investigate the self-healing properties of metal selenides. Additionally, the Na3V2(PO4)3/CuSe full cell exhibited a good cyclability of 151 mAh g−1 after 2000 cycles. The superior properties of CuSe in conjunction with an ether-type electrolyte provide deep insights for the development of long-lasting cycling batteries. © 2023
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대학원 (나노신소재융합공학과)
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