Graphene Quantum Dots Coated VO2 Arrays for Highly Durable Electrodes for Li and Na Ion Batteries

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• 作者：Dongliang Chao ; Changrong Zhu ; Xinhui Xia ; Jilei Liu ; Xiao Zhang ; Jin Wang ; Pei Liang ; Jianyi Lin ; Hua Zhang ; Ze Xiang Shen ; Hong Jin Fan
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：January 14, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：565-573
• 全文大小：607K
• ISSN：1530-6992

文摘

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 鈥渟ensitizer鈥?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.