Yue Fang, Tie Zhiwei, Zhang Yan, Bi Songshan, Wang Yijing, Niu Zhiqiang
Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education), Renewable Energy Conversion and Storage Center, Haihe Laboratory of Sustainable Chemical Transformations, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 4;61(40):e202208513. doi: 10.1002/anie.202208513. Epub 2022 Sep 5.
Air self-charging aqueous metal-ion batteries usually suffer from capacity loss after self-charging cycles due to the formation of basic salts on cathodes in the near-neutral electrolytes. Here, air self-charging Pb/pyrene-4,5,9,10-tetraone (PTO) batteries based on proton chemistry are developed in acidic electrolyte. The fast kinetics of H uptake/removal endows the battery with enhanced electrochemical performance. Owing to the high standard electrode potential of oxygen in acid electrolyte, the discharged cathodes are spontaneously oxidized by oxygen in air along with H extraction and thus achieve self-charging without external power supply. Notably, the air self-charging mechanism involved H -based redox can effectively avoid the generation of basic salts on self-charging electrodes and thus guarantee long-term self-charging/galvanostatic discharging cycles of Pb/PTO batteries. This work provides a promising strategy for designing long-cycle air self-charging systems.
空气自充电水系金属离子电池在自充电循环后通常会出现容量损失，这是由于在近中性电解质中，阴极上会形成碱性盐。在此，基于质子化学的空气自充电铅/芘-4,5,9,10-四酮（PTO）电池在酸性电解质中得以开发。氢吸收/去除的快速动力学赋予了该电池增强的电化学性能。由于酸性电解质中氧的标准电极电位较高，放电后的阴极会被空气中的氧自发氧化，同时提取氢，从而在无外部电源的情况下实现自充电。值得注意的是，涉及基于氢的氧化还原的空气自充电机制能够有效避免在自充电电极上产生碱性盐，从而保证铅/PTO电池的长期自充电/恒电流放电循环。这项工作为设计长循环空气自充电系统提供了一种有前景的策略。
