Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 23, Pages 12652-12657Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b03837
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Funding
- Chinese 1000 Youth-Talent Plan
- National Natural Science Foundation of China [51672188, 11234011, 11327901]
- Tianjin Natural Science Foundation [16JCYBJC40900]
- Fundamental Research Funds for the Central Universities [2017QNA4008]
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In this article, we report a study of the electrochemical performance and degradation mechanism of tin (Sn) nanoparticle anodes in potassium-ion batteries (KIBs). A high capacity of 197 mAh/g was found for the Sn nanoparticles in KIBs. In situ transmission electron microscopy characterization revealed a two-step potassiation mechanism: formation of a KSn phase after full potassiation and reversible nanopore formation during the cycling of Sn nanoparticles. However, significant capacity fading occurred after a few cycles, which was caused by the severe pulverization of the Sn nanoparticles. This work offers a fundamental understanding of the reaction and degradation mechanisms of alloying-type anodes for KIBs, shedding light on the development of high-performance KIBs.
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