期刊
IONICS
卷 27, 期 12, 页码 4983-4993出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-021-04267-8
关键词
LiFePO4-covered Si; Interface; Si-O sites; Extra Li storage; Lithium-ion battery
资金
- National Natural Science Foundation of China [81927809, 21777108]
- Science and Technology Department of Sichuan Province [2019YFG0218]
A composite of LiFePO4-covered silicon particles, C-LFP-Si, was prepared through a solvothermal process followed by calcination. The composite exhibited high reversible specific capacity, capacity retention rate, and specific energy, making it promising for future large-scale applications.
We prepared a composite of LiFePO4 (LFP)-covered silicon particles, C-LFP-Si, via a facile solvothermal process followed by calcination. LFP particles are grown on Si particles and contact closely with them due to the abundant oxygenic groups on the surface of Si. As a result, the Si particles are fully surrounded by LFP, producing a large amount of LFP-Si interfaces. The Si-O oxygenic groups at the interfaces serve as additional Li storage sites, thus resulting in extra capacity. When employed as a cathode for Li-ion batteries (LIBs), the composite possesses a very high reversible specific capacity of 186 mAh g(-1) at the rate of 0.1 C, and a high capacity retention rate of 95% after 400 cycles at 1 C. Additionally, the composite also possesses a high specific energy of 618.8 Wh kg(-1), much higher than the commercial LFP, and the full cell based on the C-LFP-Si composite cathode can bring a high-mass energy density of 273.1 Wh kg(-1). Equally importantly, the fabrication of this structured composite of LFP and Si with large capacity is facile, together with the inherited stability feature, eco-friendliness, and low cost, making it promising in future practical large-scale producing applications.
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