A polydopamine coating enabling the stable cycling of MnO2 cathode materials in aqueous zinc batteries,Chemical Science

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A polydopamine coating enabling the stable cycling of MnO2 cathode materials in aqueous zinc batteries
Chemical Science ( IF 7.6 ) Pub Date : 2024-02-01 , DOI: 10.1039/d3sc06096a
Guoli Zhang ₁ , Jiaqi Zhu ₁ , Lu Lin ₁ , Yaozhi Liu ₁ , Shuo Li ₁ , Qianrui Li ₁ , Xiao-Xia Liu _{1,

2,

3} , Xiaoqi Sun _{1,

2}

Affiliation

MnO₂ is a desired cathode candidate for aqueous zinc batteries. However, their cycling stability is seriously limited by active material dissolution, and pre-addition of Mn²⁺ salts in electrolytes is widely required to shift the dissolution equilibrium. Herein, we synthesize a polydopamine (PDA) coated MnO₂ composite material (MnO₂/PDA) to realize stable cycling in zinc cells without relying on pre-added Mn²⁺. The functional groups on PDA exhibit strong coordination ability with the Mn active material. It not only confines dissolved species within the cathode during discharge, but also enhances their deposition back to the cathode during charge to retrieve the active material. Thanks to this effect, the cathode achieves 81.1% capacity retention after 2000 cycles at 1 A g⁻¹ in the 1 M ZnSO₄ electrolyte, superior to 37.3% with the regular MnO₂ cathode. This work presents an effective strategy to realize the stable cycling of manganese oxide cathode materials in aqueous zinc batteries.

中文翻译：

聚多巴胺涂层使 MnO2 正极材料在水性锌电池中稳定循环

MnO ₂是水性锌电池理想的阴极候选材料。然而，它们的循环稳定性受到活性材料溶解的严重限制，并且广泛需要在电解质中预先添加Mn ²⁺盐来改变溶解平衡。在此，我们合成了聚多巴胺（PDA）涂覆的MnO ₂复合材料（MnO ₂ /PDA），以在不依赖预先添加的Mn ²⁺的情况下实现锌电池中的稳定循环。 PDA上的官能团与Mn活性材料表现出很强的配位能力。它不仅在放电过程中将溶解的物质限制在阴极内，而且在充电过程中增强它们沉积回阴极以回收活性材料。由于这种效应，在1 M ZnSO ₄电解质中以1 A g ^-1循环2000次后，阴极实现了81.1%的容量保持率，优于常规MnO ₂阴极的37.3%。这项工作提出了一种实现水系锌电池中氧化锰正极材料稳定循环的有效策略。

更新日期：2024-02-03

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