Effect of Vanillin to Prevent the Dendrite Growth of Zn in Zinc-Based Secondary Batteries
Effect of Vanillin to Prevent the Dendrite Growth of Zn in Zinc-Based Secondary Batteries
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DOI：
10.1149/2.0221712jes
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发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Itaya, Kingo
中科院分区：
文献类型：
--
作者：
Azhagurajan, Mukkannan;Nakata, Akiyoshi;Itaya, Kingo
尽管人们已经做了大量的研究工作来减少锌基二次电池中锌的枝晶生长，但枝晶生长仍然是一个严重的问题，需要在该领域进行进一步的研究。在本文中，我们已经调查，香草醛作为添加剂材料，或者消除，或协助最大限度地减少锌沉积过程中的枝晶生长的形成。测试了超过300个循环的充放电曲线，并且即使在相对大的电流密度下，也观察到具有少量香草醛（0.5-5 mM）的无枝晶的锌表面。另一方面，在无香草醛的溶液中观察到枝晶生长。为了观察锌在超平面Au（111）上的动态沉积过程，我们使用了具有微分干涉显微镜的先进光学显微镜，该显微镜使我们能够在高速扫描时间（4帧/秒，即使在100 × 100 μ m的大面积上也类似于10帧/秒）下跟踪锌的沉积和溶解的时间依赖性过程。我们还发现，“黑”膜的形成依赖于所施加的电极电位。可以预见，这种不溶性膜可能是可充电锌电池中锌枝晶形成和生长的关键因素。(C)2017年电化学学会。All rights reserved.
Although considerable research efforts have been taken to minimize the dendrite growth of zinc in zinc-based secondary batteries, still dendrite growth is a severe issue, which needs further research in this field. In this paper, we have investigated that vanillin as an additive material either eliminates, or assist to minimize the formation of dendrite growth during the deposition of Zn. More than 300 cycles of charge-discharge curves are tested and even at relatively large current densities, dendrite-free zinc surfaces are observed with small amount of vanillin (0.5-5 mM). On the other hand, dendrite growth was observed in the vanillin-free solution. In order to observe the dynamic zinc deposition process on ultra-flat Au(111), we have used an advanced optical microscopy with differential interference microscopy which allowed us to follow the time dependent processes of deposition and dissolution of Zn at high speed accusation times (4 similar to 10 frames/sec even in large area of 100 x 100 mu m). We also found that the formation of "black" films depends on the applied electrode potentials. It is anticipated that such insoluble films might be a key factor for the formation and growth of zinc dendrites in rechargeable zinc batteries. (C) 2017 The Electrochemical Society. All rights reserved.