Oxygen‐Deficient Birnessite‐MnO2 for High‐Performing Rechargeable Aqueous Zinc‐Ion Batteries,ChemNanoMat

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Oxygen‐Deficient Birnessite‐MnO2 for High‐Performing Rechargeable Aqueous Zinc‐Ion Batteries
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-07-02 , DOI: 10.1002/cnma.202000300
Zhi Wei Javier Ang ₁ , Ting Xiong ₁ , Wee Siang Vincent Lee ₁ , Junmin Xue ₁

Affiliation

The development and commercialisation of Zinc‐Ion Batteries (ZIBs) faces a daunting challenge caused by the limited selection of cathode materials. Among all the available choices, Manganese‐Based Oxides show the most promising potential due to the various benefits such as, low costs, natural abundance of Manganese, environmental benignity and its multiple valence states. Most notably, Manganese Dioxide (MnO₂) as a cathode material for ZIBs has always been a popular area of research as it can exist in various phases with tunnelled and layered structures for the (de‐)intercalation of Zn²⁺ ions. However, despite many works reported on enhancing the electrochemical performances of MnO₂, most of the proposed methodologies of improving the performance is based on Zn²⁺ ion insertion kinetics and these methods has been pushed to saturation. Herein, we propose an alternative direction of creating oxygen deficiency via defect engineering to enhance the surface‐capacitive electrochemical performance of MnO₂. In this work, the Zn//Oxygen‐deficient Birnessite‐MnO₂ achieved a specific capacity of 378 mAh g⁻¹ which is one of the highest among other existing Zn//Birnessite‐MnO₂ battery systems. Thus, this work is expected to shine light on the potential of defect engineering as a strategy to enhance electrochemical performances of MnO₂.

中文翻译：

用于高性能可充电锌离子水溶液的缺氧水钠锰矿-MnO2

锌离子电池（ZIBs）的开发和商业化由于阴极材料的选择有限而面临着严峻的挑战。在所有可用的选择中，基于锰的氧化物由于成本低，锰的自然丰度，环境良性及其多价态等多种优势而显示出最有希望的潜力。最值得注意的是，作为ZIBs阴极材料的二氧化锰（MnO ₂）一直是研究的热门领域，因为它可以存在于具有隧道状和层状结构的不同相中，以进行（去）Zn ²⁺离子的嵌入。然而，尽管报道了许多关于增强MnO ₂电化学性能的工作，大多数改善性能的方法是基于Zn ²⁺离子插入动力学的，这些方法已被推向饱和。在本文中，我们提出了通过缺陷工程产生缺氧的替代方向，以增强MnO ₂的表面电容电化学性能。在这项工作中，Zn //缺氧的Birnessite-MnO ₂的比容量达到378 mAh g ^-1，这是其他现有Zn // Birnessite-MnO ₂电池系统中最高的比容量之一。因此，这项工作有望将缺陷工程的潜力作为增强MnO ₂电化学性能的一种策略。

更新日期：2020-07-02

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