Tan Peng, Chen Bin, Xu Haoran, Cai Weizi, He Wei, Liu Meilin, Shao Zongping, Ni Meng
Department of Building and Real Estate, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China.
School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA.
Small. 2018 May;14(21):e1800225. doi: 10.1002/smll.201800225. Epub 2018 Apr 22.
The rapid development of electric vehicles and modern personal electronic devices is severely hindered by the limited energy and power density of the existing power sources. Here a novel hybrid Zn battery is reported which is composed of a nanostructured transition metal oxide-based positive electrode (i.e., Co O nanosheets grown on carbon cloth) and a Zn foil negative electrode in an aqueous alkaline electrolyte. The hybrid battery configuration successfully combines the unique advantages of a Zn-Co O battery and a Zn-air battery, achieving a high voltage of 1.85 V in the Zn-Co O battery region and a high capacity of 792 mAh g . In addition, the battery shows high stability while maintaining high energy efficiency (higher than 70%) for over 200 cycles and high rate capabilities. Furthermore, the high flexibility of the carbon cloth substrate allows the construction of a flexible battery with a gel electrolyte, demonstrating not only good rechargeability and stability, but also reasonable mechanical deformation without noticeable degradation in performance. This work also provides an inspiring example for further explorations of high-performance hybrid and flexible battery systems.
现有电源有限的能量和功率密度严重阻碍了电动汽车和现代个人电子设备的快速发展。本文报道了一种新型混合锌电池，它由基于纳米结构过渡金属氧化物的正极（即生长在碳布上的CoO纳米片）和锌箔负极组成，置于碱性水电解质中。这种混合电池配置成功地结合了锌钴氧化物电池和锌空气电池的独特优势，在锌钴氧化物电池区域实现了1.85 V的高电压和792 mAh g的高容量。此外，该电池表现出高稳定性，在200多个循环中保持高于70%的高能量效率以及高倍率性能。此外，碳布基材的高柔韧性使得能够构建带有凝胶电解质的柔性电池，不仅展示出良好的可充电性和稳定性，而且在合理的机械变形下性能无明显退化。这项工作也为进一步探索高性能混合和柔性电池系统提供了一个鼓舞人心的例子。
