Surface Adsorption of Polyethylene Glycol to Suppress Dendrite Formation on Zinc Anodes in Rechargeable Aqueous Batteries,ChemElectroChem

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Surface Adsorption of Polyethylene Glycol to Suppress Dendrite Formation on Zinc Anodes in Rechargeable Aqueous Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-06-17 , DOI: 10.1002/celc.201800572
Aly Mitha ₁ , Alireza Z. Yazdi ₁ , Moin Ahmed ₁ , Pu Chen ₁

Affiliation

Aqueous metal batteries routinely suffer from the dendritic growth at the anode, leading to significant capacity fading and ultimately, battery failure from short‐circuit. Herein, we utilize polyethylene glycol to regulate dendrite growth and improve the long‐term cycling stability of an aqueous rechargeable lithium/zinc battery. PEG200 in the electrolyte decreases the corrosion and chronoamperometric current densities of the zinc electrode up to four‐fold. Batteries with pre‐grown dendrites also perform significantly better when PEG is present in the electrolyte (41.4 mAh g⁻¹ vs. 7.9 mAh g⁻¹ after 1000 cycles). X‐ray diffraction and electron microscopy studies show that dendrites in the PEG‐containing electrolyte have been inhibited, leading to much smaller/smoother surface features than those of the control. The facile preparation process of the aqueous electrolyte combined with low cost and vast performance improvement in batteries of all sizes indicates high upscaling viability.

中文翻译：

聚乙二醇的表面吸附抑制可充电水电池中锌阳极上枝晶的形成。

水性金属电池通常会在阳极处出现树枝状生长，从而导致容量显着下降，并最终导致电池因短路而失效。在这里，我们利用聚乙二醇来调节树枝状晶体的生长，并改善水性锂/锌电池的长期循环稳定性。电解质中的PEG200将锌电极的腐蚀和计时电流密度降低了四倍。当电解质中存在PEG时，具有预先生长的树枝状晶体的电池的性能也明显更好（41.4 mAh g ^-1与7.9 mAh g ^-11000个周期后）。X射线衍射和电子显微镜研究表明，含PEG的电解质中的树枝状晶体已被抑制，导致其表面特征比对照组的更小/更光滑。含水电解质的简便制备方法与低成本和各种尺寸电池中性能的极大提高相结合，表明了高规模化的可行性。

更新日期：2018-06-17

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