Abouzari-Lotf Ebrahim, Azmi Raheleh, Li Zhenyou, Shakouri Shirin, Chen Zhi, Zhao-Karger Zhirong, Klyatskaya Svetlana, Maibach Julia, Ruben Mario, Fichtner Maximilian
Electrochemical Energy Storage, Helmholtz Institute Ulm (HIU), Helmholtzstraße 11, 89081, Ulm, Germany.
Institute of Nanotechnology and Institute of Quantum Materials and Technology, Karlsruhe Institute of Technology, P.O. Box 3640, 76021, Karlsruhe, Germany.
ChemSusChem. 2021 Apr 22;14(8):1840-1846. doi: 10.1002/cssc.202100340. Epub 2021 Mar 16.
Development of practical rechargeable Mg batteries (RMBs) is impeded by their limited cycle life and rate performance of cathodes. As demonstrated herein, a copper-porphyrin with meso-functionalized ethynyl groups is capable of reversible two- and four-electron storage at an extremely fast rate (tested up to 53 C). The reversible four-electron redox process with cationic-anionic contributions resulted in a specific discharge capacity of 155 mAh g at the high current density of 1000 mA g . Even at 4000 mA g , it still delivered >70 mAh g after 500 cycles, corresponding to an energy density of >92 Wh kg at a high power of >5100 W kg . The ability to provide such high-rate performance and long-life opens the way to the development of practical cathodes for multivalent metal batteries.
实用型可充电镁电池（RMBs）的发展受到其有限的循环寿命和阴极倍率性能的阻碍。如本文所示，一种具有中官能化乙炔基的铜卟啉能够以极快的速率（测试高达53C）进行可逆的双电子和四电子存储。具有阳离子-阴离子贡献的可逆四电子氧化还原过程在1000 mA g的高电流密度下产生了155 mAh g的比放电容量。即使在4000 mA g的电流密度下，经过500次循环后仍能提供>70 mAh g的比容量，对应于在>5100 W kg的高功率下>92 Wh kg的能量密度。提供如此高倍率性能和长寿命的能力为多价金属电池实用阴极的开发开辟了道路。
