Tan Xiaoping, Guo Gaoli, Wang Kaidi, Zhang Huang
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China.
Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an 710072, China.
Nanomaterials (Basel). 2022 Jul 23;12(15):2530. doi: 10.3390/nano12152530.
Aqueous zinc-ion batteries offer the greatest promise as an alternative technology for low-cost and high-safety energy storage. However, the development of high-performance cathode materials and their compatibility with aqueous electrolytes are major obstacles to their practical applications. Herein, we report the synthesis of orthorhombic VO·HO nanorods as cathodes for aqueous zinc batteries. As a result, the electrode delivers a reversible capacity as high as 320 mAh g at 1.0 A g and long-term cycling stability in a wide window of 0.2 to 1.8 V using a mild ZnSO aqueous electrolyte. The superior performance can be attributed to the improved stability of materials, inhibited electrolyte decomposition and facilitated charge transfer kinetics of such materials for aqueous zinc storage. Furthermore, a full cell using microsized Zn powder as an anode within capacity-balancing design exhibits high capacity and stable cycling performance, proving the feasibility of these materials for practical application.
水系锌离子电池作为一种低成本、高安全性储能的替代技术，具有最大的应用前景。然而，高性能正极材料的开发及其与水系电解质的兼容性是其实际应用的主要障碍。在此，我们报道了作为水系锌电池正极的正交晶系VO·HO纳米棒的合成。结果，该电极在1.0 A g的电流密度下具有高达320 mAh g的可逆容量，并在0.2至1.8 V的宽电压窗口内使用温和的ZnSO水系电解质具有长期循环稳定性。优异的性能可归因于材料稳定性的提高、电解质分解的抑制以及此类材料用于水系锌存储时电荷转移动力学的促进。此外，在容量平衡设计中使用微米级锌粉作为阳极的全电池表现出高容量和稳定的循环性能，证明了这些材料实际应用的可行性。
