期刊
NANO RESEARCH
卷 11, 期 12, 页码 6294-6303出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2153-2
关键词
Si nanosheets; molten-salt exfoliation; mesoporous structure; Li-storage anode; superior rate capability
类别
资金
- National Postdoctoral Program for Innovative Talents [BX201600140]
- China Postdoctoral Science Foundation [2016M600484]
- Fundamental Research Funds for the Central Universities [WK2060190078]
- National Natural Science Fund of China [21701163]
- Anhui Provincial Natural Science Foundation [1808085QB25]
Two-dimensional (2D) materials have attracted enormous attention due to their functional applications in energy storage. In this work, a low-temperature molten-salt chemical exfoliation methodology is developed for producing free-standing 2D mesoporous Si through deintercalation of CaSi2 in excess molten AlCl3 at 195 degrees C. The average dimension of these sheets is 1.5 mu m, and the thickness of a single sheet is approximately 10 nm. The as-prepared 2D Si has a Brunauer-Emmett-Teller surface area of 154 m(2).g(-1) and an average pore size of 5.87 nm. With this unique structure, the 2D Si exhibits superior Li-storage performance, including a reversible capacity of 2,974 mA.h.g(-1) at 0.2 C, reversible capacities of 2,162, 1,947, and 1,527 mA.h.g(-1) at 0.8, 2, and 5 C after 200 cycles, and a capacity retention of 357 mA.h.g(-1) even at 30 C (90 A.g(-1)).
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