Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 40, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202101413
Keywords
metal phosphide anodes; amorphous phosphates; buffer volume expansion; SEI; PIBs
Categories
Funding
- Science and Technology Development Fund, Macau SAR [0191/2017/A3, 0041/2019/A1, 0046/2019/AFJ, 0021/2019/AIR]
- University of Macau [MYRG2017-00216-FST, MYRG2018-00192-IAPME]
- UEA funding, Science and Technology Program of Guangzhou [2019050001]
- National Key Research and Development Program of China [2019YFE0198000]
- Pearl River Talent Program [2019QN01L951]
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This study successfully prepared metal phosphide composites with high cycling performance by using amorphous phosphates as buffer materials, providing effective guidance and strategy for the development of high-performance anodes for PIBs.
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.
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