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Suppressing Manganese Dissolution in Potassium Manganate with Rich Oxygen Defects Engaged High‐Energy‐Density and Durable Aqueous Zinc‐Ion Battery
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-02-25 , DOI: 10.1002/adfm.201808375 Guozhao Fang 1 , Chuyu Zhu 1 , Minghui Chen 1 , Jiang Zhou 1 , Boya Tang 1 , Xinxin Cao 1 , Xusheng Zheng 2 , Anqiang Pan 1 , Shuquan Liang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-02-25 , DOI: 10.1002/adfm.201808375 Guozhao Fang 1 , Chuyu Zhu 1 , Minghui Chen 1 , Jiang Zhou 1 , Boya Tang 1 , Xinxin Cao 1 , Xusheng Zheng 2 , Anqiang Pan 1 , Shuquan Liang 1
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The manganese dissolution leading to sharp capacity decline as well as the sluggish reaction kinetic are still major issues for manganese‐based materials as aqueous zinc‐ion batteries (ZIBs) cathodes. Here, a potassium‐ion‐stabilized and oxygen‐defect K0.8Mn8O16 is reported as a high‐energy‐density and durable cathode for neutral aqueous ZIBs. A new insight into suppressing manganese dissolution via incorporation of K+ ions to intrinsically stabilize the Mn‐based cathodes is provided. A comprehensive study suggests that oxygen defects improve electrical conductivity and open the MnO6 polyhedron walls for ion diffusion, which plays a critical role in the fast reaction kinetics and capacity improvement of K0.8Mn8O16. In addition, direct evidence for the mechanistic details of simultaneous insertion and conversion reaction based on H+‐storage mechanism is demonstrated. As expected, a significant energy output of 398 W h kg−1 (based on the mass of cathode) and an impressive durability over 1000 cycles with no obvious capacity fading are obtained. Such a high‐energy Zn‐K0.8Mn8O16 battery, as well as the basic understanding of manganese dissolution and oxygen defects may open new opportunities toward high‐performance aqueous ZIBs.
中文翻译：
通过高能量密度和耐用的水性锌离子电池抑制富含氧缺陷的锰酸钾中的锰溶解
锰的溶解导致容量急剧下降以及反应动力学迟缓，仍然是作为水性锌离子电池（ZIBs）阴极的锰基材料的主要问题。在此，据报道，钾离子稳定且氧缺陷的K 0.8 Mn 8 O 16是中性水性ZIBs的高能量密度且持久的阴极。提供了通过结合K +离子来本质上稳定Mn基阴极来抑制锰溶解的新见解。一项综合研究表明，氧缺陷可改善电导率并打开MnO 6多面体壁以进行离子扩散，这在钾的快速反应动力学和容量提高中起着关键作用。0.8 Mn 8 O 16。此外，直接证据证明了基于H +储存机理的同时插入和转化反应的机理细节。如预期的那样，获得了398 W h kg -1的显着能量输出（基于阴极的质量），并且在1000次循环中获得了令人印象深刻的耐久性，而容量没有明显下降。这种高能量的Zn-K 0.8 Mn 8 O 16电池，以及对锰溶解和氧缺陷的基本了解，可能会为高性能水性ZIBs带来新的机遇。
更新日期：2019-02-25
中文翻译：
通过高能量密度和耐用的水性锌离子电池抑制富含氧缺陷的锰酸钾中的锰溶解
锰的溶解导致容量急剧下降以及反应动力学迟缓，仍然是作为水性锌离子电池（ZIBs）阴极的锰基材料的主要问题。在此，据报道，钾离子稳定且氧缺陷的K 0.8 Mn 8 O 16是中性水性ZIBs的高能量密度且持久的阴极。提供了通过结合K +离子来本质上稳定Mn基阴极来抑制锰溶解的新见解。一项综合研究表明，氧缺陷可改善电导率并打开MnO 6多面体壁以进行离子扩散，这在钾的快速反应动力学和容量提高中起着关键作用。0.8 Mn 8 O 16。此外，直接证据证明了基于H +储存机理的同时插入和转化反应的机理细节。如预期的那样，获得了398 W h kg -1的显着能量输出（基于阴极的质量），并且在1000次循环中获得了令人印象深刻的耐久性，而容量没有明显下降。这种高能量的Zn-K 0.8 Mn 8 O 16电池，以及对锰溶解和氧缺陷的基本了解，可能会为高性能水性ZIBs带来新的机遇。
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