VO2 (A)/graphene nanostructure: Stand up to Na ion intercalation/deintercalation for enhanced electrochemical performance as a Na-ion battery cathode. (10th January 2019)

• Record Type: Journal Article
• Authors: Hu, Xinyuan; Zhao, Zhengjing; Wang, Lin; Li, Jingbo; Wang, Chengzhi; Zhao, Yongjie; Jin, Haibo
• Is Part Of: Electrochimica acta. Volume 293(2019)
• Page Start: 97
• Page End: 104
• Publication Date: 2019-01-10
• Subjects: Na-ion battery -- VO2 (A) nanowire -- VO2 (A)/graphene composite -- Battery cathode material -- Cycle stability; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.10.010
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Intercalation/deintercalation of large size Na ion leads to serious electrode materials fragmentation that would be the main reason of Na-ion battery capacity fading. Herein, we reported a Na-ion battery cathode material composed of layer-structured VO2 (A) nanowires wrapped with graphene. The VO2 (A)/graphene nanostructure which effectively suppressed pulverization of VO2 (A) nanowires during cyclic charging and discharging exhibited prominent cycle stability and high specific capacity. A reversible capacity of 115 mA h g −1 was retained over 100 cycles at a high current density of 100 mA g −1 . Comparing to the electrochemical performance of other vanadium oxides, VO2 (A)/graphene demonstrates a potential cathode material for Na-ion batteries. Highlights: VO2 (A) nanowires and its graphene composites are synthesized easily. VO2 (A)/Gr shows prominent cycle stability and high specific capacity as SIB cathode. Layered structure of VO2 (A) is favorable to intercalation/deintercalation of Na ion. Graphene coating greatly suppresses pulverization and aggregation of VO2 (A).