Metal phosphides embedded with in situ-formed metal phosphate impurities as buffer materials for high-performance potassium-ion batteries

Ji, Shunping, Song, Chunyan, Li, Junfeng, Hui, Kwan San ORCID:, Deng, Wenjun, Wang, Shuo, Li, Haifeng, Dinh, Duc Anh, Fan, Xi, Wu, Shuxing, Zhang, Jintao, Chen, Fuming, Shao, Zongping and Hui, Kwun Nam (2021) Metal phosphides embedded with in situ-formed metal phosphate impurities as buffer materials for high-performance potassium-ion batteries. Advanced Energy Materials, 11 (40). ISSN 1614-6832

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As anodes for metal-ion batteries, metal phosphides usually suffer from severe capacity degradation because of their huge volume expansion and unstable solid electrolyte interphase (SEI), especially for potassium-ion batteries (PIBs). To address these issues, this study proposes amorphous phosphates acting as buffer materials. Ten types of metal phosphide composites embedded with in situ-formed amorphous phosphates are prepared by one-step ball milling using red phosphorus (RP) and the corresponding metal oxides (MOs) as starting materials. A zinc phosphide composite is selected for further study as a PIB anode. Benefitting from the effective suppression of volume variation, a KF-rich SEI is formed on the electrode surface in the KFSI-based electrolyte. The zinc phosphide composite exhibits a high reversible specific capacity and outstanding long-term cycling stability (476 mAh g −1 over 350 cycles at 0.1 A g −1 after going through a rate capability test and 177 mAh g −1 after 6000 cycles at 1.0 A g −1) and thus achieves the best cycling performance among all reported metal phosphide-based anodes for PIBs. This study highlights a low-cost and effective strategy to guide the development of metal phosphides as high-performance anodes for PIBs.

Item Type: Article
Additional Information: Funding Information: 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), University of Macau (File no. MYRG2017‐00216‐FST and MYRG2018‐00192‐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: pibs,sei,amorphous phosphates,buffer volume expansion,metal phosphide anodes,renewable energy, sustainability and the environment,materials science(all) ,/dk/atira/pure/subjectarea/asjc/2100/2105
Faculty \ School: Faculty of Science > School of Engineering
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Energy Materials Laboratory
Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV)
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Depositing User: LivePure Connector
Date Deposited: 16 Oct 2021 00:52
Last Modified: 21 Apr 2023 01:10
DOI: 10.1002/aenm.202101413


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