期刊
NANO LETTERS
卷 15, 期 1, 页码 565-573出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl504038s
关键词
Vanadium oxides; sodium ion battery; lithium ion battery; graphene quantum dots; nanoarray electrodes
类别
资金
- SERC Public Sector Research Funding [1121202012]
- Agency for Science, Technology, and Research (A*STAR)
- MOE AcRF Tier 1 [RG104/14]
- MOE AcRF Tier 2 [ARC 26/13, MOE2013-T2-1-034]
- AcRF Tier 1 in Singapore [RG61/12, RGT18/13, RG5/13, M4080865.070]
- National Research Foundation, Prime Minister's Office, Singapore
Nanoscale surface engineering is playing important role in enhancing the performance of battery electrode. VO2 is one of high-capacity but less-stable materials and has been used mostly in the form of powders for Li-ion battery cathode with mediocre performance. In this work, we design a new type of binder-free cathode by bottom-up growth of biface VO2 arrays directly on a graphene network for both high-performance Li-ion and Na-ion battery cathodes. More importantly, graphene quantum dots (GQDs) are coated onto the VO2 surfaces as a highly efficient surface sensitizer and protection to further boost the electrochemical properties. The integrated electrodes deliver a Na storage capacity of 306 mAh/g at 100 mA/g, and a capacity of more than 110 mAh/g after 1500 cycles at 18 A/g. Our result on Na-ion battery may pave the way to next generation postlithium batteries.
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