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Structural Transformation by Crystal Engineering Endows Aqueous Zinc-Ion Batteries with Ultra-long Cyclability
Small ( IF 13.0 ) Pub Date : 2023-04-08 , DOI: 10.1002/smll.202300585 Kangning Wang 1 , Jianwei Wang 1 , Peiming Chen 1 , Mengran Qin 1 , Chunming Yang 1 , Wenlin Zhang 1 , Zhuangzhuang Zhang 1 , Yanzhong Zhen 1 , Feng Fu 1 , Bin Xu 2
Small ( IF 13.0 ) Pub Date : 2023-04-08 , DOI: 10.1002/smll.202300585 Kangning Wang 1 , Jianwei Wang 1 , Peiming Chen 1 , Mengran Qin 1 , Chunming Yang 1 , Wenlin Zhang 1 , Zhuangzhuang Zhang 1 , Yanzhong Zhen 1 , Feng Fu 1 , Bin Xu 2
Affiliation
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Manganese oxide is a promising cathode material for aqueous zinc batteries. However, its weak structural stability, low electrical conductivity, and sluggish reaction kinetics lead to rapid capacity fading. Herein, a crystal engineering strategy is proposed to construct a novel MnO2 cathode material. Both experimental results and theoretical calculations demonstrate that Al-doping plays a crucial role in phase transition and doping-superlattice structure construction, which stabilizes the structure of MnO2 cathode materials, improves conductivity, and accelerates ion diffusion dynamics. As a result, 1.98% Al-doping MnO2 (AlMO) cathode shows an incredible 15 000 cycle stability with a low capacity decay rate of 0.0014% per cycle at 4 A g−1. Additionally, it provides superior specific capacity of 311.2 mAh g−1 at 0.1 A g−1 and excellent rate performance (145.2 mAh g−1 at 5.0 A g−1). To illustrate the potential of 1.98%AlMO to be applied in actual practice, flexible energy storage devices are fabricated and measured. These discoveries provide a new insight for structural transformation via crystal engineering, as well as a new avenue for the rational design of electrode material in other battery systems.
中文翻译：
晶体工程结构改造赋予水系锌离子电池超长循环性能
氧化锰是一种很有前景的水系锌电池正极材料。然而，其结构稳定性差、电导率低和反应动力学缓慢导致容量快速衰减。在此，提出了晶体工程策略来构建新型MnO 2正极材料。实验结果和理论计算都表明Al掺杂在相变和掺杂超晶格结构构建中起着至关重要的作用，它稳定了MnO 2正极材料的结构，提高了电导率，并加速了离子扩散动力学。结果，1.98% Al掺杂的MnO 2 (AlMO)阴极表现出令人难以置信的15 000次循环稳定性，在4 A g -1下每个循环的容量衰减率为0.0014% 。此外，它在0.1 A g -1下提供了311.2 mAh g -1的优异比容量和优异的倍率性能（5.0 A g -1下为145.2 mAh g -1）。为了说明 1.98%AlMO 在实际应用中的潜力，我们制造并测量了柔性储能装置。这些发现为通过晶体工程进行结构转变提供了新的见解，也为其他电池系统中电极材料的合理设计提供了新途径。
更新日期：2023-04-08
中文翻译：
晶体工程结构改造赋予水系锌离子电池超长循环性能
氧化锰是一种很有前景的水系锌电池正极材料。然而，其结构稳定性差、电导率低和反应动力学缓慢导致容量快速衰减。在此，提出了晶体工程策略来构建新型MnO 2正极材料。实验结果和理论计算都表明Al掺杂在相变和掺杂超晶格结构构建中起着至关重要的作用，它稳定了MnO 2正极材料的结构，提高了电导率，并加速了离子扩散动力学。结果，1.98% Al掺杂的MnO 2 (AlMO)阴极表现出令人难以置信的15 000次循环稳定性，在4 A g -1下每个循环的容量衰减率为0.0014% 。此外，它在0.1 A g -1下提供了311.2 mAh g -1的优异比容量和优异的倍率性能（5.0 A g -1下为145.2 mAh g -1）。为了说明 1.98%AlMO 在实际应用中的潜力，我们制造并测量了柔性储能装置。这些发现为通过晶体工程进行结构转变提供了新的见解，也为其他电池系统中电极材料的合理设计提供了新途径。
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