期刊
NANO LETTERS
卷 20, 期 5, 页码 3836-3843出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00943
关键词
porous carbon; lithium storage; sodium storage; adsorption; hard carbon
类别
资金
- National Natural Science Foundation of China (NSFC) [51372268]
- National Key Development Program of China [2015CB251100]
The lithium and sodium storage behavior of porous carbon remains controversial, though it shows excellent cycling stability and rate performances. This Letter discloses the insertion, adsorption, and filling properties of porous carbon. Li-7 nuclear magnetic resonance (NMR) spectroscopy recognized inserted and adsorbed lithium in this porous carbon but did not observe any other forms of lithium above 0.0 V vs. Li+/Li. In addition, although lithium insertion mainly takes place at low potentials, adsorption was found to be the main form of lithium storage throughout the investigated potential range. Such a storage feature is responsible for the excellent rate performance and high specific capacity of porous carbon. Raman spectroscopy further demonstrated the structural reversibility of the carbon in different potential ranges, verifying the necessity to optimize the potential range for a better cycling performance. These findings provide insights for the design and application of porous carbon.
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