用于可充电水系锌电池的新型添加剂组合抑制锌枝晶,RSC Advances

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用于可充电水系锌电池的新型添加剂组合抑制锌枝晶
RSC Advances ( IF 3.9 ) Pub Date : 2022-09-02 , DOI: 10.1039/d2ra04468d
Gang Lin ₁ , Xiaoliang Zhou _{1,

2} , Limin Liu _{1,

2} , Di Huang ₁ , Huangmin Li ₁ , Xueyan Cui ₁ , Jing Liu ₁

Affiliation

水系锌电池（AZBs）具有成本低、安全性好、易于组装等优点，有望成为一种很有前途的储能装置。然而，AZBs 受到锌枝晶和析氢反应的影响。在此，我们使用聚乙二醇-200 (PEG-200) 和苯亚甲基丙酮 (BDA) 作为 AZBs 电解液中的添加剂，以抑制锌枝晶生长和副反应，从而提高锌电极的循环性能。PEG-200 不仅可以用作 BDA 的助溶剂，还可以用作表面活性剂，以实现均匀的界面电场。BDA作为光亮剂，在镀层基体上形成扩散层，增加了电化学极化和形核过电位，增加了活性形核位点的数量，最终细化了锌层的晶粒尺寸。使用含有PEG-200添加剂的电解液的对称电池电极在循环后表面光滑，并且成功地抑制了枝晶的形成。含添加剂电解质的 Zn-Zn 对称电池具有更高的成核过电位和长达 890 小时的循环稳定性（未改性的对称电池仅为 48 小时）。这是由于添加剂吸附在负极上，使沉积界面均匀化，减少了负极与水的接触。含添加剂电解质的 Zn-Zn 对称电池具有更高的成核过电位和长达 890 小时的循环稳定性（未改性的对称电池仅为 48 小时）。这是由于添加剂吸附在负极上，使沉积界面均匀化，减少了负极与水的接触。含添加剂电解质的 Zn-Zn 对称电池具有更高的成核过电位和长达 890 小时的循环稳定性（未改性的对称电池仅为 48 小时）。这是由于添加剂吸附在负极上，使沉积界面均匀化，减少了负极与水的接触。

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Zinc dendrite suppression by a novel additive combination for rechargeable aqueous zinc batteries

With the advantages of low cost, good safety, and easy assembly, aqueous zinc batteries (AZBs) are expected to be a promising energy storage device. However, AZBs are compromised by Zn dendrites and the hydrogen evolution reaction. Herein, we use polyethylene glycol-200 (PEG-200) and benzylidene acetone (BDA) as additives in the electrolyte of AZBs in order to inhibit Zn dendrite growth and side reactions, thus improving the cycle performance of the Zn electrode. PEG-200 can be not only used as a co-solvent for BDA but also as a surfactant to achieve a uniform interfacial electric field. As a brightening agent, BDA forms a diffusion layer on the plating substrate, which increases the electrochemical polarization and nucleation overpotential, increases the number of active nucleation sites, and finally refines the grain size of the zinc deposit. The surface of the symmetric battery electrode with electrolyte containing PEG-200 additive is smooth after cycling, and dendrite formation is successfully suppressed. The Zn–Zn symmetric cell with additive-containing electrolyte has a higher nucleation overpotential and a cyclic stability for as long as 890 h (only 48 h for the unmodified symmetric cell). This is due to the adsorption of the additive on the negative electrode, which homogenizes the deposition interface and reduces the contact of the negative electrode with water.

更新日期：2022-09-02

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