Self-Reinforced Cathode Interface to Prolong the Cyclic Stability of Zn-MnO2 Batteries

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-11-25 DOI:10.1021/acs.nanolett.4c03390

Xiangru Si, Ruijie Zhu, Cheng Yang, Tanghao Shi, Peixing Du, Min Li, Yang Yang, Wei Cui, Huijun Yang, Hiroaki Kobayashi, Masaki Matsui, Nan Sheng, Chunyu Zhu

引用次数: 0

Abstract

Rechargeable aqueous zinc-ion batteries (RAZIBs) are attracting increasing attention due to their advantages in safety, cost, and energy density. However, the choice of electrode binders when using aqueous electrolytes faces many constraints, as nontoxic and low-cost hydrophilic binders, such as sodium alginate (SA), can lead to electrode damage due to excessive swelling in aqueous solution. Here, by employing double-network hydrogel electrolytes formed by poly(vinyl alcohol) and alginate, the content and activity of water molecules at the electrode–electrolyte interface are reduced, and the mechanical stability of the electrode is reinforced, thereby affording reliable protection to the cathode bonded with SA. The quasi-solid-state interface formed between SA and the gel electrolyte provides stable electrode architecture and smooth ion transport, thus enabling Zn||MnO₂ cells to exhibit excellent electrochemical cycling performance even when using hydrophilic binders.

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自我强化阴极界面以延长 Zn-MnO2 电池的循环稳定性

可充电锌离子水电池（RAZIBs）因其在安全性、成本和能量密度方面的优势而日益受到关注。然而，在使用水性电解质时，电极粘合剂的选择面临许多限制，因为无毒且低成本的亲水性粘合剂（如海藻酸钠（SA））会因在水溶液中过度膨胀而导致电极损坏。在这里，通过采用由聚（乙烯醇）和海藻酸盐形成的双网水凝胶电解质，降低了电极-电解质界面上水分子的含量和活性，增强了电极的机械稳定性，从而为与 SA 粘合的阴极提供了可靠的保护。SA 与凝胶电解质之间形成的准固态界面提供了稳定的电极结构和顺畅的离子传输，从而使 Zn||MnO2 电池即使在使用亲水性粘合剂的情况下也能表现出优异的电化学循环性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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