Liu Hongwen, Chen Chih-Yao, Yang Hao, Wang Yu, Zou Lianli, Wei Yong-Sheng, Jiang Jialong, Guo Jiachen, Shi Wei, Xu Qiang, Cheng Peng
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, College of Chemistry, Nankai University, Tianjin, 300071, China.
AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan.
Adv Mater. 2020 Nov;32(46):e2004553. doi: 10.1002/adma.202004553. Epub 2020 Oct 13.
Halogen redox couples offer several advantages for energy storage such as low cost, high solubility in water, and high redox potential. However, the operational complexity of storing halogens at the oxidation state via liquid-phase media hampers their widespread application in energy-storage devices. Herein, an aqueous zinc-dual-halogen battery system taking the advantages of redox flow batteries (inherent scalability) and intercalation chemistry (high capacity) is designed and fabricated. To enhance specific energy, the designed cell exploits both bromine and chlorine as the cathode redox couples that are present as halozinc complexes in a newly developed molten hydrate electrolyte, which is distinctive to the conventional zinc-bromine batteries. Benefiting from the reversible uptake of halogens at the graphite cathode, exclusive reliance on earth-abundant elements, and membrane-free and possible flow-through configuration, the proposed battery can potentially realize high-performance massive electric energy storage at a reasonable cost.
卤素氧化还原电对在能量存储方面具有诸多优势，如成本低、在水中溶解度高以及氧化还原电位高。然而，通过液相介质以氧化态存储卤素的操作复杂性阻碍了它们在储能设备中的广泛应用。在此，设计并制造了一种水性锌双卤素电池系统，该系统利用了氧化还原液流电池（固有的可扩展性）和嵌入化学（高容量）的优势。为了提高比能量，所设计的电池采用溴和氯作为阴极氧化还原电对，它们以卤化锌配合物的形式存在于新开发的熔融水合物电解质中，这与传统的锌溴电池不同。得益于石墨阴极上卤素的可逆吸收、仅依赖储量丰富的元素以及无膜且可能的流通式配置，所提出的电池有望以合理的成本实现高性能的大规模电能存储。
