Huang Shimin, He Shenggong, Qin Haiqing, Hou Xianhua
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Guangdong Engineering Technology Research Center of Efficient Green Energy and Environment Protection Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, P. R. China.
Guangxi Key Laboratory of Superhard Material, National Engineering Research Center for Special Mineral Material, China Nonferrous Metals (Guilin) Geology And Mining Co., Ltd., Guilin 541004, P. R. China.
ACS Appl Mater Interfaces. 2021 Sep 22;13(37):44379-44388. doi: 10.1021/acsami.1c12653. Epub 2021 Sep 8.
Zinc ion batteries have become a new type of energy storage device because of the low cost and high safety. Among the various cathode materials, vanadium-oxygen compounds stand out due to their high theoretical capacity and variable chemistry valence state. Here, we construct a 3D spongy hydrated vanadium dioxide composite (O-HVO/rG) with abundant oxygen vacancy defects and graphene modifications. Thanks to the stable structure and abundant active sites, O-HVO/rG exhibits superior electrochemical properties. In aqueous electrolyte, the O-HVO/rG cathode provides high initial charging capacity (428.6 mAh/g at 0.1 A/g), impressive rate performance (186 mAh/g even at 20 A/g), and cycling stability, which can still maintain 197.5 mAh/g after 2000 cycles at 10 A/g. Also, the superior specific energy of 245.3 Wh/kg and specific power of 14142.7 W/kg are achieved. In addition, MXene/O-HVO/rG cathode materials are prepared and PAM/ZnSO hydrogel electrolytes are applied to assemble flexible soft pack quasi-solid-state zinc ion batteries, which also exhibit excellent flexibility and cycling stability (206.6 mAh/g after 2000 cycles). This work lays the foundation for advances in rechargeable aqueous zinc ion batteries, while revealing the potential for practical applications of flexible energy storage devices.
由于成本低且安全性高，锌离子电池已成为一种新型储能装置。在各种阴极材料中，钒氧化物因其高理论容量和可变的化学价态而脱颖而出。在此，我们构建了一种具有丰富氧空位缺陷和石墨烯修饰的三维海绵状水合二氧化钒复合材料（O-HVO/rG）。得益于其稳定的结构和丰富的活性位点，O-HVO/rG表现出优异的电化学性能。在水性电解质中，O-HVO/rG阴极具有高初始充电容量（0.1 A/g时为428.6 mAh/g）、令人印象深刻的倍率性能（即使在20 A/g时也为186 mAh/g）和循环稳定性，在10 A/g下循环2000次后仍可保持197.5 mAh/g。此外，还实现了245.3 Wh/kg的优异比能量和14142.7 W/kg的比功率。此外，制备了MXene/O-HVO/rG阴极材料，并应用PAM/ZnSO水凝胶电解质组装柔性软包准固态锌离子电池，该电池也表现出优异的柔韧性和循环稳定性（2000次循环后为206.6 mAh/g）。这项工作为可充电水性锌离子电池的发展奠定了基础，同时揭示了柔性储能装置实际应用的潜力。
