Volume 64, Issue 24 e202506466
Research Article

Towards High-Performance Aqueous Zn-Organic Batteries via Using I-Based Active Electrolyte

Lei Yan

Corresponding Author

Lei Yan

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

E-mail: [email protected]; [email protected]

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Lei Liu

Lei Liu

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

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Chaoyi Qiu

Chaoyi Qiu

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

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Yutian Xiang

Yutian Xiang

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

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Haoxiang Yu

Haoxiang Yu

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

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Liyuan Zhang

Liyuan Zhang

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

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Ting-Feng Yi

Ting-Feng Yi

Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004 China

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Yonggang Wang

Yonggang Wang

Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433 China

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Jie Shu

Corresponding Author

Jie Shu

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 China

E-mail: [email protected]; [email protected]

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First published: 07 April 2025
Citations: 3

Graphical Abstract

A high-performance Zn-organic battery (Zn//HATN@CMK-3 battery) is developed by using an I-based active cathodic electrolyte. Benefiting from the high redox potential of the I/I0 redox couple, the Zn//HATN@CMK-3 cell harvests a high average discharge voltage (0.75 V vs. Zn/Zn2+) and outstanding cycling stability at a high mass-loading (10 mg cm−2).

Abstract

Organic cathodes possess inherent structural diversity and fast redox kinetics, showing great application prospects in aqueous Zn batteries. Nevertheless, most of the reported organic cathodes display low average working voltage resulting in poor energy density. Herein, diquinoxalino [2,3-a:2′,3′-c] phenazine (HATN)@CMK-3 composite is utilized as cathode for aqueous zinc battery, which combines the Zn2+ and H+ co-storage and I/I0 conversion by introducing I-based active additive into 0.5 M Zn(OTf)2 electrolyte. The in situ/ex situ analyses and computational studies disclose that HATN@CMK-3 with C═N groups not only stores Zn2+ and H+ ions at low potential but also acts as a substrate to promote the conversion reaction of I/I0 at high potential. Accordingly, the Zn//HATN@CMK-3 cell delivers a high average voltage of 0.75 V, prominent long-life (10 000 cycles) and, high energy density (198 Wh kg−1). Remarkably, under high mass loading (10 mg cm−2) or low-temperature conditions, the cell still achieves decent capacity and cycle stability.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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