期刊
SMALL STRUCTURES
卷 1, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/sstr.202000010
关键词
fast charging; graphite anodes; lithium-ion diffusion; porous carbon layers; three-electrode measurements
资金
- National Natural Science Foundation of China [21776019, 21825501, U1801257]
- National Key Research and Development Program [2016YFA0202500, 2016YFA0200102]
- Tsinghua University Initiative Scientific Research Program, Department of Science and Technology of Jilin Province [20180520014JH]
- Education Department of Jilin Province [JJKH20180549KJ]
- Science and Technology Innovative Development Program of Jilin City [201831737]
The use of graphite anode renders practical lithium-ion batteries for effective energy storage. However, graphite anode is the bottleneck to achieve the fast charging of a battery, ascribed to its low operating potential and corresponding incidental lithium plating. Herein the principle of a thin nanoscale layer on the graphite surface to improve charging capability is investigated by applying a three-electrode device to precisely record the working behavior. The Lithorn diffusion rate is significantly improved by coating a nanoscale turbostratic carbon layer, in which abundant active sites and additional fast Lithorn diffusion pathways at the basal-plane side of graphite sheets render small polarization in a working battery. This fresh understanding enriches the fundamental insights into enhancing the rate performance and facilitating the practical applications of graphite in fast-charging batteries.
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