Wang Yichun, Chao Dongliang, Wang Zhenzhu, Ni Jiangfeng, Li Liang
School of Physical Science and Technology, Center for Energy Conversion Materials & Physics (CECMP), Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, China.
Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China.
ACS Nano. 2021 Mar 23;15(3):5420-5427. doi: 10.1021/acsnano.1c00075. Epub 2021 Mar 12.
The development of low-cost and high-energy aqueous battery technologies is of significance for renewable and stationary energy applications. However, this development has been bottlenecked by poor conductivity, low capacity, and limited cycling stability of existing electrode materials. In this work, we report on an energetic aqueous copper ion system based on CuS nanosheet arrays, taking profit of high conductivity of CuS and efficient charge carrier of copper ions. Electrochemical results reveal a high capacity of 510 mAh g, robust rate capability of 497 mAh g at a high rate of 7.5 A g, and ultrastable cycling by retaining 91% of the initial capacity over 2500 cycles. The charge-storage mechanism was systematically investigated by and techniques involving a reversible transition from CuS to CuS and to CuS through the redox of Cu/Cu. Moreover, we demonstrate a hybrid ion battery consisting of CuS positive electrode and Zn negative electrode, which affords an energy and power of 286 Wh kg and 900 W kg, respectively, on the basis of both electrodes, exceeding many aqueous battery systems.
低成本、高能量水系电池技术的发展对于可再生能源和固定式能源应用具有重要意义。然而，这一发展受到现有电极材料导电性差、容量低以及循环稳定性有限的制约。在这项工作中，我们报道了一种基于硫化铜纳米片阵列的高能水系铜离子体系，利用了硫化铜的高导电性和铜离子的高效电荷载流子。电化学结果显示其具有510 mAh g的高容量、在7.5 A g的高电流密度下497 mAh g的稳健倍率性能，以及在2500次循环中保持91%初始容量的超稳定循环性能。通过涉及Cu/Cu氧化还原反应使CuS可逆转变为CuS和CuS的技术系统地研究了其电荷存储机制。此外，我们展示了一种由硫化铜正极和锌负极组成的混合离子电池，基于两个电极，其能量和功率分别为286 Wh kg和900 W kg，超过了许多水系电池系统。
