Dynamic reversible evolution of solid electrolyte interface in nonflammable triethyl phosphate electrolyte enabling safe and stable potassium-ion batteries

Ji, Shunping, Li, Jielei, Li, Junfeng, Song, Chunyan, Wang, Shuo, Wang, Kexuan, Hui, Kwan San ORCID: https://orcid.org/0000-0001-7089-7587, Zha, Chenyang, Zheng, Yunshan, Dinh, Duc Anh, Chen, Shi, Zhang, Jintao, Mai, Wenjie, Tang, Zikang, Shao, Zongping and Hui, Kwun Nam (2022) Dynamic reversible evolution of solid electrolyte interface in nonflammable triethyl phosphate electrolyte enabling safe and stable potassium-ion batteries. Advanced Functional Materials, 32 (28). ISSN 1616-301X

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Potassium-ion batteries (PIBs) are a favorable alternative to lithium-ion batteries (LIBs) for the large-scale electrochemical storage devices because of the high natural abundance of potassium resources. However, conventional PIB electrodes usually exhibit low actual capacities and poor cyclic stability due to the large radius of potassium ions (1.39 Å). In addition, the high reactivity of potassium metal raises serious safety concerns. These characteristics seriously inhibit the practical use of PIB electrodes. Here, zinc phosphide composites are rationally designed as PIB anodes for operation in a nonflammable triethyl phosphate (TEP) electrolyte to solve the above-mentioned issues. The optimized zinc phosphide composite with 20 wt% zinc phosphate presents a high specific capacity (571.1 mA h g−1 at 0.1 A g−1) and excellent cycling performance (484.9 mA h g−1 with the capacity retention of 94.5% after 1000 cycles at 0.5 A g−1) in the KFSI-TEP electrolyte. XPS depth profile analysis shows that the improved cycling stability of the composite is closely related to the reversible dynamic evolutions and conversions of the sulfur-containing species in the solid electrolyte interphase (SEI) during the charge/discharge process. This dynamic reversible SEI concept may provide a new strategy for the design of superior electrodes for PIBs.

Item Type: Article
Additional Information: Funding Information: S.J. and J.L. contributed equally to this work. 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, 0096/2020/A2), University of Macau (File no. MYRG2017‐00216‐FST, MYRG2018‐00192‐IAPME, MYRG2020‐00187‐IAPME, MYRG 2020‐00283‐IAPME), and the UEA funding. Publisher Copyright: © 2022 Wiley-VCH GmbH.
Uncontrolled Keywords: non-flammable electrolytes,potassium-ion batteries,solid electrolyte interfaces,triethyl phosphate,zinc phosphide,electronic, optical and magnetic materials,chemistry(all),biomaterials,materials science(all),condensed matter physics,electrochemistry,sdg 7 - affordable and clean energy ,/dk/atira/pure/subjectarea/asjc/2500/2504
Faculty \ School: Faculty of Science > School of Engineering
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Depositing User: LivePure Connector
Date Deposited: 25 Apr 2024 10:31
Last Modified: 25 Apr 2024 10:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/95008
DOI: 10.1002/adfm.202200771


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