Li Xinliang, Liu Tong, Li Pei, Liang Guojin, Huang Zhaodong, Chen Ze, Chen Ao, Su Yuefeng, Yang Lijiang, Cao Duanyun, Zhi Chunyi
School of Physics and Laboratory of Zhongyuan Light, Zhengzhou University, Zhengzhou 450052, China.
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong 999077, China.
ACS Nano. 2025 Jan 21;19(2):2900-2908. doi: 10.1021/acsnano.4c16550. Epub 2025 Jan 7.
While many cathode materials have been developed for mild electrolyte-based Zn batteries, the lack of cathode materials hinders the progress of alkaline zinc batteries. Halide iodine, with its copious valence nature and redox possibilities, is considered a promising candidate. However, energetic alkaline iodine redox chemistry is impeded by an alkali-unadapted I element cathode and thermodynamically unstable reaction products. Here, we formulated and evaluated an aqueous alkaline Zn-iodine battery with a two-electron transfer employing an organic iodized salt cathode and a Cl-manipulated electrolyte. The single-step redox reaction of the I/I couple resulted in a high discharge plateau of 1.68 V and a capacity of 385 mA h g. Our battery reached an energy density of 577 W h kg, superior to that of reported counterparts. Theoretical and experimental characterizations determined the redox chemistry between alkaline and iodine. We believe the developed iodine chemistry in alkaline environments can enrich cathode materials for alkaline batteries.
虽然已经开发出许多用于基于温和电解质的锌电池的阴极材料，但阴极材料的缺乏阻碍了碱性锌电池的发展。卤化物碘具有丰富的价态性质和氧化还原可能性，被认为是一种有前途的候选材料。然而，高能碱性碘氧化还原化学受到与碱不适应的碘元素阴极和热力学不稳定的反应产物的阻碍。在此，我们配制并评估了一种采用有机碘化盐阴极和氯调控电解质的双电子转移水性碱性锌碘电池。I/I 电对的单步氧化还原反应产生了 1.68 V 的高放电平台和 385 mA h g 的容量。我们的电池能量密度达到 577 W h kg，优于已报道的同类电池。理论和实验表征确定了碱性物质与碘之间的氧化还原化学。我们相信在碱性环境中开发的碘化学可以丰富碱性电池的阴极材料。
