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Do Zinc Dendrites Exist in Neutral Zinc Batteries: A Developed Electrohealing Strategy to In Situ Rescue In-Service Batteries.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-09-13 , DOI: 10.1002/adma.201903778
Qi Yang 1 , Guojin Liang 1 , Ying Guo 1 , Zhuoxin Liu 1 , Boxun Yan 1 , Donghong Wang 1 , Zhaodong Huang 1 , Xinliang Li 1 , Jun Fan 1 , Chunyi Zhi 1, 2
Affiliation  

The dendritic issue in aqueous zinc-ion batteries (ZBs) using neutral/mild electrolytes has remained an intensive controversy for a long time: some researchers assert that dendrites severely exist while others claim great cycling stability without any protection. This issue is clarified by investigating charge/discharge-condition-dependent formation of Zn dendrites. Lifespan degradation (120 to 1.2 h) and voltage hysteresis deterioration (134 to 380 mV) are observed with increased current densities due to the formation of Zn dendrites (edge size: 0.69-4.37 µm). In addition, the capacity is also found to remarkably affect the appearance of the dendrites as well. Therefore, at small current densities or loading mass, Zn dendrites might not be an issue, while the large conditions may rapidly ruin batteries. Based on this discovery, a first-in-class electrohealing methodology is developed to eliminate already-formed dendrites, generating extremely prolonged lifespans by 410% at 7.5 mA cm-2 and 516% at 10 mA cm-2 . Morphological analysis reveals that vertically aligned Zn dendrites with sharp tips gradually become passivated and finally generate a smooth surface. This developed electrohealing strategy may promote research on metal dendrites in various batteries evolving from passive prevention to active elimination, rescuing in-service batteries in situ to achieve elongated lifetime.

中文翻译:

中性锌电池中是否存在树枝状锌:一种用于现场维修使用中电池的已开发的电修复策略。

长期以来,使用中性/轻度电解质的水性锌离子电池(ZB)中的树突问题一直是一个激烈的争论:一些研究人员断言树突严重存在,而另一些研究人员则声称其循环稳定性极强,没有任何保护作用。通过研究充电/放电条件依赖的锌树枝状晶体的形成,可以澄清该问题。由于形成了锌枝晶(边缘尺寸:0.69-4.37 µm),随着电流密度的增加,观察到寿命降低(120至1.2 h)和电压滞后劣化(134至380 mV)。另外,还发现容量也显着影响树枝状晶体的外观。因此,在较小的电流密度或负载质量下,Zn树枝状晶体可能不会成为问题,而较大的条件可能会迅速破坏电池。基于这一发现,开发了一流的电修复方法以消除已经形成的树枝状晶体,从而在7.5 mA cm-2时产生410%的超长寿命,而在10 mA cm-2时产生516%的超长寿命。形态分析表明,具有尖锐尖端的垂直排列的Zn树突逐渐被钝化,最终生成光滑的表面。这种发达的电修复策略可能会促进从被动防护到主动消除的各种电池中金属树枝状晶体的研究,并在原地抢救在用电池以延长使用寿命。形态分析表明,具有尖锐尖端的垂直排列的Zn树突逐渐被钝化,最终生成光滑的表面。这种发达的电修复策略可能会促进从被动防护到主动消除的各种电池中金属树枝状晶体的研究,并在原地抢救在用电池以延长使用寿命。形态分析表明,具有尖锐尖端的垂直排列的Zn树突逐渐被钝化,最终生成光滑的表面。这种发达的电修复策略可能会促进从被动防护到主动消除的各种电池中金属树枝状晶体的研究,并在原地抢救在用电池以延长使用寿命。
更新日期:2019-10-23
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