摘要
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.
基金
The authors are thankful to funds from the China Postdoctoral Science Foundation(No.RZ1900011127)
Qingdao Innovation Leading Talent Program and Taishan Scholars Program and Natural Science Foundation of Shandong(No.ZR2017BEM028)
M.S.is thankful to funds from the Science Foundation of Jiangsu Province(No.BK20171169)
C.W.L.thanks the support from National Natural Science Foundation of China(No.51802168)
China Postdoctoral Science Foundation(No.2018M630753)
Natural Science Foundation of Shandong Province(No.ZR2018BEM006)
Qingdao Postdoctoral Application Research Project.
