期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 25, 页码 15262-15270出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta03760h
关键词
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资金
- French National Research Agency (STORE-EX Labex Project) [ANR-10-LABX-76-01]
The electrochemical mechanism and performance of Sn-based electrodes are thoroughly studied in K-ion batteries. Low temperature ex situ(119)Sn Mossbauer spectroscopy combined with first principles calculations provides a clear description of the electrochemical mechanism, identifying the formation of poorly crystalline and/or nanosized KSn at the end of the potassiation of beta-Sn. During depotassiation, the formation of the intermediate phase K4Sn9 is established on the basis of DFT and Mossbauer spectroscopy. When tin is associated with antimony in SnSb, a different potassiation path is revealed for tin, with a huge impact on the overall performance. In fact, while the presence of antimony suppresses completely the decomposition of the electrolyte caused by tin particles, the new electrochemical potassiation/depotassiation mechanism drastically reduces the modifications in the local environment and the electrode morphology as evidenced by ex situ and post-mortem SEM analyses. Thanks to the positive impact of the association of tin with antimony, which reduces electrode degradation, a stable high specific capacity of more than 300 mA h g(-1) can be achieved for Sn-based negative electrodes in K-ion batteries.
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