Institute of Functional Materials and Green Chemical Process, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, 318 Liuhe Road, Hangzhou, 310023, China.
College of Materials Science and Engineering, Center for Membrane and Water Science & Technology, and College of Chemical Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, China.
Small. 2023 Mar;19(10):e2207517. doi: 10.1002/smll.202207517. Epub 2023 Jan 17.
Aqueous rechargeable zinc-ion batteries (ZIBs) have attracted burgeoning interests owing to the prospect in large-scale and safe energy storage application. Although manganese oxides are one of the typical cathodes of ZIBs, their practical usage is still hindered by poor service life and rate performance. Here, a MnO -carbon hybrid framework is reported, which is obtained in a reaction between the dimethylimidazole ligand from a rational designed MOF array and potassium permanganate, achieving ultralong-cycle-life ZIBs. The unique structural feature of uniform MnO nanocrystals which are well-distributed in the carbon matrix leads to a 90.4% capacity retention after 50 000 cycles. In situ characterization and theoretical calculations verify the co-ions intercalation with boosted reaction kinetics. The hybridization between MnO and carbon endows the hybrid with enhanced electrons/ions transport kinetics and robust structural stability. This work provides a facile strategy to enhance the battery performance of manganese oxide-based ZIBs.
水系可充锌离子电池（ZIBs）由于其在大规模和安全储能应用方面的前景而引起了人们的浓厚兴趣。尽管锰氧化物是 ZIBs 的典型正极材料之一，但由于其使用寿命和倍率性能不佳，其实际应用仍受到限制。在此，报道了一种 MnO-碳杂化框架，该框架是通过在合理设计的 MOF 阵列中的二甲基咪唑配体与高锰酸钾之间的反应获得的，实现了超长循环寿命的 ZIBs。均匀的 MnO 纳米晶体在碳基质中分布良好的独特结构特征导致在 50000 次循环后容量保持率为 90.4%。原位表征和理论计算验证了共离子的插层以及增强的反应动力学。MnO 和碳的杂化赋予了该杂化物增强的电子/离子传输动力学和稳健的结构稳定性。这项工作为提高基于锰氧化物的 ZIBs 的电池性能提供了一种简便的策略。
