期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 38, 页码 21794-21801出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta09502k
关键词
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资金
- National Natural Science Foundation of China [51772272, 51728204]
- Fundamental Research Funds for the Central Universities [2018QNA4011]
- Qianjiang Talents Plan D [QJD1602029]
Uncontrollable dendrite growth and large volume expansion severely impede the practical application of lithium metal anodes. To address these issues, in this work, we report novel MgO nanosheets on carbon cloth (CC) forming highly ordered lithiophilic sites to regulate the plating/stripping behavior of Li. Interestingly, MgO nanosheets composed of crosslinked nanoparticles show excellent lithiophilicity and successfully tune the electric-field distribution to decrease the current density, thereby suppressing the dendrite growth, supported by COMSOL Multiphysics simulation. Notably, the as-prepared MgO/CC can store Li with an ultrahigh areal capacity of similar to 12 mA h cm(-2) without an obvious dendrite morphology and volume change. Furthermore, the lithiophilic nature of MgO as a nucleation site for Li deposition is demonstrated by DFT calculation. Consequently, the MgO/CC@Li anode exhibits prominent electrochemical performance with a stable voltage hysteresis of similar to 30 mV (0.5 mA cm(-2)) over 2000 h (500 cycles), making it superior to its CC@Li and Cu@Li counterparts. When coupled with a Li4Ti5O12 (LTO) cathode, the MgO/CC@Li anode also exhibits excellent compatibility both in terms of enhanced capacity retention and boosted rate performance. Our work demonstrates the effectiveness of the synergetic design of lithiophilic sites plus hierarchical architecture for Li metal anodes.
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