期刊
NANO LETTERS
卷 14, 期 8, 页码 4306-4313出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl500993q
关键词
Graphene; nanostructure; size-tuning lithium ion battery; metal oxides; battery performance
类别
资金
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2009-0094219]
The scalable preparation of graphene in control of its structure would significantly improve its commercial viability. Despite intense research in this area, the size control of defect-free graphene (df-G) without any trace of oxidation or structural damage remains a key challenge. Here, we propose a new scalable route for generating df-G with a controllable size of submicron to micron through sequential insertion of potassium and pyridine at low temperature. Structural and chemical analyses confirm that the df-G perfectly preserves the intrinsic properties of graphene. The Co3O4 (<50 nm) wrapped by similar to 10.5 mu m(2) df-G has unprecedented capacity, rate capability, and cycling stability with capacities as high as 1050 mAh g(-1) at 500 mA g(-1) and 900 mAh g(-1) at 1000 mA g(-1) even after 200 cycles, which suggests enticing potential for the use in high performance lithium ion batteries.
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