期刊
NANO LETTERS
卷 21, 期 15, 页码 6504-6510出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01595
关键词
amorphous materials; hard carbon; sodium-ion batteries; local order; sodium storage
类别
资金
- JSPS [19K15389, 18H05939]
- Fusion Research Funds from WPI-AIMR
- FRIS, Tohoku University
- Whiting School of Engineering, Johns Hopkins University
- National Science Foundation [NSF DMR-1804320]
- Grants-in-Aid for Scientific Research [18H05939, 19K15389] Funding Source: KAKEN
The study reported quantitative measurements of sodium storage in low-temperature dealloyed hard carbon with a tunable structure, revealing different mechanisms of sodium adsorption and intercalation in various voltage regions. This provides essential insights for designing advanced sodium-ion battery anodes.
The fundamental understanding of sodium storage mechanisms in amorphous carbon is essential to develop high-performance anode materials for sodium-ion batteries. However, the intrinsic relation between the structure of amorphous carbon and Na+ storage remains to be debated due to the difficulty in controlling and characterizing the local atomic configurations of amorphous carbon. Here we report quantitative measurements of Na+ storage in a low-temperature dealloyed hard carbon with a tunable local structure from completely disordered micropores to gradually increased graphitic order domains. The structure-capacity-potential correlation not only verifies the disputing adsorption-intercalation mechanisms, i.e., Na+ intercalation into local graphitic domains for the low-voltage plateaus and adsorption in fully disordered carbon for the sloping voltage profiles, but also unveils a new mechanism of Na+ adsorption on defective sites of graphitic carbon in the medium-potential sloping region. The quantitative investigations provide essential insights into the reaction mechanisms of Na+ with amorphous carbon for designing advanced sodium-ion battery anodes.
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