Dai Lixin, Wang Yan, Sun Lu, Ding Yi, Yao Yuanqing, Yao Lide, Drewett Nicholas E, Zhang Wei, Tang Jun, Zheng Weitao
Department of Polymer Science College of Chemistry Electron Microscopy Center Jilin University Changchun 130012 China.
School of Materials Science & Engineering Key Laboratory of Mobile Materials MOE Jilin University Changchun 130012 China.
Adv Sci (Weinh). 2021 May 5;8(12):2004995. doi: 10.1002/advs.202004995. eCollection 2021 Jun.
Although one of the most promising aqueous batteries, all Zn-Mn systems suffer from Zn dendrites and the low-capacity Mn/Mn process (readily leading to the occurrence of Jahn-Teller distortion, which in turn causes structural collapse and voltage/capacity fading). Here, the Mn reconstruction and disproportionation are exploited to prepare the stable, Mn-rich manganese oxides on carbon-cloth (CMOs) in a discharged state through an inverted design, which promotes reversible Mn/Mn kinetics and mitigates oxygen-related redox activity. Such a 1.65 V Mn-rich cathode enable constructing a 2.2 V Zn-Mn battery, providing a high area capacity of 4.16 mA h cm (25 mA h cm for 10 mL electrolyte) and superior 4000-cycle stability. Moreover, a flexible hybrid 2.7 V Zn-Mn battery is constructed using 2-pH hydrogel electrolytes to demonstrate excellent practicality and stability. A further insight has been gained to the commercial application of aqueous energy storage devices toward low-cost, high safety, and excellent energy density.
尽管全锌-锰体系是最有前景的水系电池之一，但所有此类体系都存在锌枝晶问题以及低容量的锰/锰过程（容易导致 Jahn-Teller 畸变的发生，进而导致结构坍塌以及电压/容量衰减）。在此，通过反向设计利用锰的重构和歧化反应，在放电状态下于碳布上制备出稳定的富锰锰氧化物（CMOs），这促进了可逆的锰/锰动力学过程，并减轻了与氧相关的氧化还原活性。这种 1.65 V 的富锰正极能够构建出 2.2 V 的锌-锰电池，提供 4.16 mA h cm²的高面积容量（对于 10 mL 电解液为 25 mA h cm²）以及卓越的 4000 次循环稳定性。此外，使用双 pH 水凝胶电解质构建了一款柔性混合 2.7 V 锌-锰电池，展现出出色的实用性和稳定性。对于水系储能装置在低成本、高安全性和优异能量密度方面的商业应用，人们有了更深入的认识。
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