Synergistic combination of a Co-doped σ-MnO2 cathode with an electrolyte additive for a high-performance aqueous zinc-ion battery

ChemPhysMater Pub Date : 2023-01-01 DOI:10.1016/j.chphma.2022.04.007

Shuhua Yang , Le Zhang , Mengjiao Luo , Yanwei Cui , Jieqiang Wang , Degang Zhao , Chao Yang , Xiutong Wang , Bingqiang Cao

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引用次数: 5

Abstract

The key challenges in aqueous zinc-manganese dioxide batteries (MnO₂//Zn) are their poor electrochemical kinetics and stability, which are mainly due to low conductivity and the inevitable dissolution of MnO₂. A synergistic combination of a Co-doped σ-MnO₂ electrode (Co-MnO₂) and a Co(CH₃COO)₂•4H₂O (CoAc) electrolyte additive is here developed to design a high-performance aqueous MnO₂//Zn battery (denoted as a Co-MnO₂//Zn battery with CoAc). The introduction of Co ions (Co³⁺/Co²⁺) into the σ-MnO₂ electrode is achieved via a facile one-step electrodeposition method. Benefitting from the synergistic coupling effect of the Co-MnO₂ electrode and the CoAc electrolyte additive, the fabricated Co-MnO₂//Zn battery with CoAc shows a commendable discharge capacity of 313.8 mAh g⁻¹ at 0.5 A g⁻¹, excellent rate performance, excellent durability over 1000 cycles (∼ 92% capacity retention at 1.0 A g⁻¹) and admirable energy density (439.3 Wh kg⁻¹), which is a significant improvement compared with an un-doped σ-MnO₂//Zn battery.

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用于高性能水性锌离子电池的钴掺杂σ-MnO2阴极与电解质添加剂的协同组合

水性锌-二氧化锰电池（MnO2//Zn）的主要挑战是其较差的电化学动力学和稳定性，这主要是由于低电导率和MnO2不可避免的溶解。本文开发了Co掺杂的σ-MnO2电极（Co-MnO2）和Co（CH3COO）2•4H2O（CoAc）电解质添加剂的协同组合，以设计高性能的水性MnO2//Zn电池（表示为具有CoAc的Co-MnO2//Zn蓄电池）。通过简单的一步电沉积方法将Co离子（Co3+/Co2+）引入σ-MnO2电极中。得益于Co-MnO2电极和CoAc电解质添加剂的协同耦合效应，使用CoAc制造的Co-MnO2//Zn电池在0.5 a g−1时显示出313.8 mAh g−1的值得称赞的放电容量、优异的倍率性能、超过1000次循环的优异耐久性（在1.0 a g−2时约92%的容量保持率）和令人钦佩的能量密度（439.3 Wh kg−1），这与未掺杂的σ-MnO2//Zn电池相比是显著的改进。

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

ChemPhysMater

CiteScore

3.90

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0.00%

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