In-situ confining selenium within bubble – like carbon nanoshells for ultra-stable Li−Se batteries
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Cen, Xinnuo
Liao, Fang
Wang, Qingqing
Luo, Wanshu
Huang, Yan
Al-Mamun, Mohammad
Dou, Yuhai
Wu, Chao
Zhang, Lei
Wang, Yun
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Abstract
Lithium-selenium (Li−Se) batteries are promising energy storage devices. However, the long-term durability and high-rate performance of the Se cathode have been limited by significant volume expansion and the troublesome shuttle effect of polyselenides during repeated charging/discharging processes. To revolutionize these issues, we applied a top-down strategy through the in-situ trapping of amorphous Se within bubble-like carbon (BLC) frameworks, which can radically minimize the presence of surface-absorbed Se while enhancing Se loading capacity. This ingenious technique successfully encapsulates all Se species within carbon nanoshells, creating a distinct half-filled core-shell structure known as Se@void@BLC. This in-situ trapping approach ensures the efficient management of Se volume changes during repeated discharge and charge cycles. Moreover, an extraordinary Se loading capacity of up to 65.6 wt% is reached. Using the Se@void@BLC as cathode for Li−Se battery, we achieve a high initial Columbic efficiency of 84.2 %, a high reversible capacity of 585 mAh g−1, and an ultralow capacity decay of only 0.0037 % per cycle during 4000 cycles at 10 A g−1.
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Chemistry – A European Journal
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30
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22
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DP210103266
DP170104834
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© 2024 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
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Chemical sciences
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Wang, Y; Cen, X; Liao, F; Wang, Q; Luo, W; Huang, Y; Al-Mamun, M; Dou, Y; Wu, C; Zhang, L; Wang, Y, In-situ confining selenium within bubble – like carbon nanoshells for ultra-stable Li−Se batteries, Chemistry – A European Journal, 2024, 30 (22), pp. e202304114