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Nitrogen-Doped CoSe2 as a Bifunctional Catalyst for High Areal Capacity and Lean Electrolyte of Li–S Battery

Wang, Maoxu, Fan, Lishuang, Sun, Xun, Guan, Bin, Jiang, Bo, Wu, Xian, Tian, Da, Sun, Kening, Qiu, Yue, Yin, Xiaoju, Zhang, Yu, Zhang, Naiqing·2020·ACS Energy Letters

Abstract

The sluggish redox kinetics of polysulfides and difficult oxidation process of Li 2 S severely hinder practical application of Li–S batteries under high sulfur loading and a low electrolyte dosage. To address these issues, we develop a bifunctional catalyst by manipulation of anion N doping in CoSe 2 (N-CoSe 2 ). Theoretical simulation results uncover that an introduced N element into CoSe 2 could form a shorter Co–N bond, create a higher charge number of the Co central atom, bring new defect levels, and induce the Co 3d band closer to Fermi level. Further atomic level analysis revealed that N-CoSe 2 could form shorter Co–S bonds with sulfur species and simultaneously weaken the S–S bridged bond of Li 2 S 4 and Li–S bond of Li 2 S, which eventually facilitate the polysulfide conversion reaction in the discharge process and the Li 2 S oxidation in the charge process. With N-CoSe 2 as a bifunctional catalyst, the battery exhibited a high areal capacity of 9.26 mAh g –1 under the low E/S (electrolyte/sulfur) ratio of 4.4 μL mg –1 . Understanding the design concept of a bifunctional catalyst with anion doping would provide a new vision for realizing a high-performance Li–S battery.

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Metadata

Authors
Wang, M., Fan, L., Sun, X., Guan, B., Jiang, B., Wu, X., Tian, D., Sun, K., Qiu, Y., Yin, X., Zhang, Y., & Zhang, N.
Venue
ACS Energy Letters
Published
2020-08-27
Volume
5
Issue
9
Pages
3041-3050
ISSN
2380-8195 (ISSN-L)
OpenAlex
W3081677589
Cited by
312
References
45
FWCI
15.36
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Nitrogen-Doped CoSe2 as a Bifunctional Catalyst for High Areal Capacity and Lean Electrolyte of Li–S Battery. https://app.cochat.ai/papers/10.1021/acsenergylett.0c01564
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Wang, M., Fan, L., Sun, X., Guan, B., Jiang, B., Wu, X., Tian, D., Sun, K., Qiu, Y., Yin, X., Zhang, Y., & Zhang, N. (2020). Nitrogen-Doped CoSe2 as a Bifunctional Catalyst for High Areal Capacity and Lean Electrolyte of Li–S Battery. ACS Energy Letters. https://doi.org/10.1021/acsenergylett.0c01564

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