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Design of Highly Reversible Zinc Anodes for Aqueous Batteries Using Preferentially Oriented Electrolytic Zinc
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-06-10 , DOI: 10.1002/batt.202000112 Ehsan Faegh 1 , Benjamin Ng 1 , Dillon Hayman 1 , William E. Mustain 1
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-06-10 , DOI: 10.1002/batt.202000112 Ehsan Faegh 1 , Benjamin Ng 1 , Dillon Hayman 1 , William E. Mustain 1
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Rechargeable zinc‐based batteries have attracted a growing interest due to their intrinsic safety, low environmental impact and potentially very low cost. However, there still remains significant hurdles to achieve cells of commercial interest. Conventional commercial Zn anodes are formed from large, polycrystalline particles with limited control over the shape and size. In this study, preferentially oriented electrolytic Zn (e‐Zn) particles with hexagonal shape and controlled size (∼100 μm) were synthesized and physically characterized by SEM, XRD and BET techniques. The corrosion, discharge and cycling behavior of e‐Zn particles were analyzed in KOH alkaline media. It was found that preferentially oriented e‐Zn particles with low surface area have lower corrosion than Zn powder and 99 % reduced corrosion rate with respect to polycrystalline Zn wire. Furthermore, e‐Zn electrodes were successfully scaled up and showed remarkable reversibility in symmetric cells at a high rate of 20 mA cm−2 for 640 h. e‐Zn/KOH/MnO2 full cells were also demonstrated with ca. 6 times longer cycle life than Zn powder with a lower H2 gassing rate at 10 % Zn DoD and C/20 rate. In addition, a comparison between alkaline vs. mild acidic electrolyte was made in terms of reversibility and structural changes of preferentially oriented e‐Zn electrodes where superior cycling was observed in ZnSO4 for 2000 h.
中文翻译：
使用优先取向的电解锌设计水电池的高度可逆锌阳极
可充电锌基电池因其本质安全性，低环境影响和极低的成本而引起了越来越多的关注。但是，要实现具有商业意义的电池仍然存在重大障碍。常规的商用Zn阳极由大的多晶颗粒形成，对形状和大小的控制有限。在这项研究中，合成了具有六边形形状和受控尺寸（〜100μm）的优先取向的电解Zn（e-Zn）颗粒，并通过SEM，XRD和BET技术对其进行了物理表征。在KOH碱性介质中分析了e-Zn颗粒的腐蚀，放电和循环行为。已经发现，具有低表面积的优先取向的e-Zn颗粒具有比Zn粉末更低的腐蚀，并且相对于多晶Zn丝，其腐蚀速率降低了99％。此外，e-Zn电极已成功按比例放大，在对称电池中以20 mA cm的高速率显示出显着的可逆性−2持续640小时。约e.Zn / KOH / MnO 2充满细胞也得到了证明。在10％Zn DoD和C / 20速率下，H 2的放气速率较低，其循环寿命是Zn粉的6倍。此外，在优先取向的e-Zn电极的可逆性和结构变化方面对碱性和弱酸性电解质进行了比较，其中在ZnSO 4中观察到了2000 h优异的循环。
更新日期：2020-06-10
中文翻译：
使用优先取向的电解锌设计水电池的高度可逆锌阳极
可充电锌基电池因其本质安全性，低环境影响和极低的成本而引起了越来越多的关注。但是，要实现具有商业意义的电池仍然存在重大障碍。常规的商用Zn阳极由大的多晶颗粒形成，对形状和大小的控制有限。在这项研究中，合成了具有六边形形状和受控尺寸（〜100μm）的优先取向的电解Zn（e-Zn）颗粒，并通过SEM，XRD和BET技术对其进行了物理表征。在KOH碱性介质中分析了e-Zn颗粒的腐蚀，放电和循环行为。已经发现，具有低表面积的优先取向的e-Zn颗粒具有比Zn粉末更低的腐蚀，并且相对于多晶Zn丝，其腐蚀速率降低了99％。此外，e-Zn电极已成功按比例放大，在对称电池中以20 mA cm的高速率显示出显着的可逆性−2持续640小时。约e.Zn / KOH / MnO 2充满细胞也得到了证明。在10％Zn DoD和C / 20速率下，H 2的放气速率较低，其循环寿命是Zn粉的6倍。此外，在优先取向的e-Zn电极的可逆性和结构变化方面对碱性和弱酸性电解质进行了比较，其中在ZnSO 4中观察到了2000 h优异的循环。
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