Stabilizing anionic redox processes in electrospun NiS2–based cathode towards durable aluminum-ion batteries

Li, Junfeng, San Hui, Kwan ORCID: https://orcid.org/0000-0001-7089-7587, Zheng, Yunshan, Ji, Shunping, Wang, Kaixi, Zha, Chenyang, Anh Dinh, Duc, Fan, Xi, Chen, Fuming, Shao, Zongping and Nam Hui, Kwun (2022) Stabilizing anionic redox processes in electrospun NiS2–based cathode towards durable aluminum-ion batteries. Chemical Engineering Journal, 450 (Part 4). ISSN 1385-8947

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Abstract

Rechargeable aluminum-ion batteries (AIBs) are receiving considerable attention as a desirable device for large-scale energy storage owing to high theoretical capacity and abundance of aluminum. However, due to strong charge of Al 3+, the state-of-the-art AIBs often show sluggish electrode reaction kinetics and rapid capacity fading and the available cathode materials always demonstrate poor structural stability, thereby greatly hindering their practical use. NiS 2 with anion redox species (S 2 2– dimers) and favorable electronic conductivity is a promising cathode to boost the performance of AIBs in terms of reversible capacity, rate capability and cycling stability. Here, we report a systematic investigation of the Al storage behavior and mechanism of NiS 2/S-doped carbon (NiS 2/SC) cathode based on a series of electrochemical tests and ex situ measurements. We further develop electrospun NiS 2/S-doped carbon@S-doped carbon nanofiber (NiS 2/SC@SCNF) structure as the cathode of AIBs. The as-fabricated AIB delivers an unprecedented Al 3+ storage performance with a stable capacity of 76 mAh/g at 0.5 A/g CV 500 cycles and a superior cycling Coulombic efficiency of 97 %. This study reveals that NiS 2/SC@SCNF undergoes a reversible evolution of initial Al 3+ insertion followed by anionic redox between S 2 2– and S 2–, paving the road for the futher development of NiS 2–based cathodes for AIBs.

Item Type: Article
Additional Information: Acknowledgements: This work was funded by the Science and Technology Development Fund, Macau SAR (File no. 0191/2017/A3, 0041/2019/A1, 0046/2019/AFJ, 0021/2019/AIR, 0007/2021/AGJ), University of Macau (File no. MYRG2017-00216-FST, MYRG2018-00192-IAPME, MYRG2020-00187-IAPME), the UEA funding, Science and Technology Program of Guangzhou (2019050001), and National Key Research and Development Program of China (2019YFE0198000). F. Chen acknowledges the Pearl River Talent Program (2019QN01L951).
Uncontrolled Keywords: aluminum-ion batteries,anionic redox,electrospun,nis -based electrode,chemistry(all),environmental chemistry,chemical engineering(all),industrial and manufacturing engineering ,/dk/atira/pure/subjectarea/asjc/1600
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Depositing User: LivePure Connector
Date Deposited: 26 Jul 2022 10:30
Last Modified: 15 Aug 2022 09:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/86859
DOI: 10.1016/j.cej.2022.138237

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