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Nano Research

Article Title

VO2·0.2H2O nanocuboids anchored onto graphene sheets as the cathode material for ultrahigh capacity aqueous zinc ion batteries

Authors

Dedong Jia, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Kun Zheng, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Ming Song, College of Chemistry and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221111, China
Hua Tan, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
Aitang Zhang, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Lihua Wang, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Lijun Yue, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Da Li, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Chenwei Li, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China
Jingquan Liu, College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, School of Electromechanical Engineering, Qingdao University, Qingdao 266071, China

Keywords

VO2·0.2H2O nanocuboids, graphene sheet, aqueous zinc-ion battery, ultrahigh capacity, electron and ion transport

Abstract

Aqueous Zinc-ion batteries (ZIBs), using zinc negative electrode and aqueous electrolyte, have attracted great attention in energy storage field due to the reliable safety and low-cost. A composite material comprised of VO2·0.2H2O nanocuboids anchored on graphene sheets (VOG) is synthesized through a facile and efficient microwave-assisted solvothermal strategy and is used as aqueous ZIBs cathode material. Owing to the synergistic effects between the high conductivity of graphene sheets and the desirable structural features of VO2·0.2H2O nanocuboids, the VOG electrode has excellent electronic and ionic transport ability, resulting in superior Zn ions storage performance. The Zn/VOG system delivers ultrahigh specific capacity of 423 mAh·g−1 at 0.25 A·g−1 and exhibits good cycling stability of up to 1,000 cycles at 8 A·g−1 with 87% capacity retention. Systematical structural and elemental characterizations confirm that the interlayer space of VO2·0.2H2O nanocuboids can adapt to the reversible Zn ions insertion/extraction. The as-prepared VOG composite is a promising cathode material with remarkable electrochemical performance for low-cost and safe aqueous rechargeable ZIBs.

Graphical Abstract

Publisher

Tsinghua University Press

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