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Constructing the Efficient Ion Diffusion Pathway by Introducing Oxygen Defects in Mn2O3 for High-Performance Aqueous Zinc-Ion Batteries.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-18 , DOI: 10.1021/acsami.0c05968 Nannan Liu 1 , Xian Wu 1 , Yanyou Yin 1 , Aosai Chen 1 , Chenyang Zhao 1 , Zhikun Guo 1 , Lishuang Fan 1, 2 , Naiqing Zhang 1, 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-18 , DOI: 10.1021/acsami.0c05968 Nannan Liu 1 , Xian Wu 1 , Yanyou Yin 1 , Aosai Chen 1 , Chenyang Zhao 1 , Zhikun Guo 1 , Lishuang Fan 1, 2 , Naiqing Zhang 1, 2
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Mn-based cathodes are admittedly the most promising candidate to achieve the practical applications of aqueous zinc-ion batteries because of the high operating voltage and economic benefit. However, the design of Mn-based cathodes still remains challenging because of the vulnerable chemical architecture and strong electrostatic interaction that lead to the inferior reaction kinetics and rapid capacity decay. These intrinsic drawbacks need to be fundamentally addressed by rationally decorating the crystal structure. Herein, an oxygen-defective Mn-based cathode (Ocu-Mn2O3) is designed via a doping low-valence Cu-ion strategy. The oxygen defect can modify the internal electric field of the material and enhance the substantial electrostatic stability by compensating for the nonzero dipole moment. With the merits of oxygen deficiency, the Ocu-Mn2O3 electrode exhibits the significant diffusion coefficient in the range from 1 × 10–6 to 1 × 10–8, and good rate performance. In addition, the Ocu-Mn2O3 maintains the highly reversible cyclic stability with the capacity retention of 88% over 600 cycles. The charge storage mechanism is explored as well, illustrating that the oxygen defects can improve the electrochemical active sites of H+ insertion, achieving a better charge-storage capacity than Mn2O3.
中文翻译：
通过在高性能水性锌离子电池中引入Mn2O3中的氧缺陷来构建有效的离子扩散途径。
锰基阴极由于其高工作电压和经济效益而被公认为是实现含水锌离子电池实际应用的最有希望的候选者。然而，基于锰的阴极的设计仍然具有挑战性，因为脆弱的化学结构和强烈的静电相互作用导致不良的反应动力学和快速的容量衰减。这些固有的缺陷需要从根本上通过合理地装饰晶体结构来解决。在此，氧缺陷型Mn基阴极（Oc u -Mn 2 O 3）是通过掺杂低价Cu离子策略设计的。氧缺陷可通过补偿非零偶极矩来改变材料的内部电场并增强基本的静电稳定性。利用缺氧的优点，Oc u -Mn 2 O 3电极在1×10 –6至1×10 –8的范围内表现出显着的扩散系数，并且具有良好的倍率性能。另外，Oc u -Mn 2 O 3保持了高度可逆的循环稳定性，在600次循环中的容量保持率为88％。还探讨了电荷存储机制，表明氧缺陷可以改善H +插入的电化学活性位，从而实现比Mn 2 O 3更好的电荷存储能力。
更新日期：2020-06-24
中文翻译：
通过在高性能水性锌离子电池中引入Mn2O3中的氧缺陷来构建有效的离子扩散途径。
锰基阴极由于其高工作电压和经济效益而被公认为是实现含水锌离子电池实际应用的最有希望的候选者。然而，基于锰的阴极的设计仍然具有挑战性，因为脆弱的化学结构和强烈的静电相互作用导致不良的反应动力学和快速的容量衰减。这些固有的缺陷需要从根本上通过合理地装饰晶体结构来解决。在此，氧缺陷型Mn基阴极（Oc u -Mn 2 O 3）是通过掺杂低价Cu离子策略设计的。氧缺陷可通过补偿非零偶极矩来改变材料的内部电场并增强基本的静电稳定性。利用缺氧的优点，Oc u -Mn 2 O 3电极在1×10 –6至1×10 –8的范围内表现出显着的扩散系数，并且具有良好的倍率性能。另外，Oc u -Mn 2 O 3保持了高度可逆的循环稳定性，在600次循环中的容量保持率为88％。还探讨了电荷存储机制，表明氧缺陷可以改善H +插入的电化学活性位，从而实现比Mn 2 O 3更好的电荷存储能力。
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