Achieving High-Performance in Zinc Hybrid Capacitors with Zn(TFSI)2/PEGDME Molecular Crowding Electrolytes

IF 5.1 4区材料科学 Q2 ELECTROCHEMISTRY

Batteries & Supercaps Pub Date : 2024-08-12 DOI:10.1002/batt.202400414

Nagaraj patil, Diana Elena Ciurduc, F.J. Landazábal, Rebeca Marcilla

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引用次数: 0

Abstract

Aqueous Zinc-hybrid capacitors (ZHCs) are gaining attention for their high-safety, low cost, easy maintenance, high-power, and longevity. Despite various strategies to mitigate dendrites, corrosion, and HER, practical application remains challenging. Here, we utilize an advanced polyethylene glycol dimethyl ether (PEGDME)-based molecular crowding electrolyte (MCE) to significantly enhance performance of ZHCs. Our MCE offers a wider electrochemical stability window (2.7 V), low HER activity, and superior Zn anti-corrosion properties due to reduced water activity compared to conventional electrolyte. This results in higher coulombic efficiencies (98–100%) at various areal capacities and current densities, and longer longevity of Zn//Cu and Zn//Zn symmetric cells with MCE compared to conventional and water-in-salt electrolytes. The Zn/MCE/AC displays an enhanced voltage window (~2 V), achieving the highest capacitance (281 F/g), competitive energy density (138 Wh/kg), low self-discharge, and excellent cyclability (19100 cycles at 1 A/g with 100% capacity retention), indicating that MCE is a promising approach for practical energy storage applications

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利用 Zn(TFSI)2/PEGDME 分子排挤电解质实现高性能锌混合电容器

水性锌-杂化电容器（ZHC）因其安全性高、成本低、易于维护、功率大和寿命长而备受关注。尽管采取了各种策略来减少枝晶、腐蚀和 HER，但实际应用仍然充满挑战。在这里，我们利用一种先进的基于聚乙二醇二甲醚（PEGDME）的分子排挤电解质（MCE）来显著提高 ZHC 的性能。与传统电解质相比，我们的 MCE 具有更宽的电化学稳定性窗口（2.7 V）、较低的 HER 活性以及因水活性降低而具有的出色的锌抗腐蚀性能。因此，与传统电解质和盐包水电解质相比，使用 MCE 的 Zn//Cu 和 Zn//Zn 对称电池在不同面积容量和电流密度下的库仑效率更高（98-100%），寿命更长。Zn/MCE/AC 显示出增强的电压窗口（~2 V），实现了最高的电容（281 F/g）、有竞争力的能量密度（138 Wh/kg）、低自放电和出色的循环性（在 1 A/g 条件下循环 19100 次，容量保持率为 100%），表明 MCE 是一种很有前途的实际储能应用方法。

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来源期刊

Batteries & Supercaps Multiple-

CiteScore

8.60

自引率

5.30%

发文量

223

期刊介绍： Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.