Low‐cost and Non‐flammable Eutectic Electrolytes for Advanced Zn‐I₂ Batteries
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(Published version)
Date
2023
Authors
Hao, J.
Yuan, L.
Zhu, Y.
Bai, X.
Ye, C.
Jiao, Y.
Qiao, S.
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Journal article
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Angewandte Chemie International Edition, 2023; 135(39):e202310284-1-e202310284-8
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Junnan Hao, Libei Yuan, Yilong Zhu, Xiaowan Bai, Chao Ye, Yan Jiao, and Shi-Zhang Qiao
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Abstract
As a burgeoning electrolyte system, eutectic electrolytes based on ZnCl₂/Zn(CF₃SO₃)₂/Zn(TFSI)₂ have been widely proposed in advanced Zn-I₂ batteries; however, safety and cost concerns significantly limit their applications. Here, we report new-type ZnSO₄-based eutectic electrolytes that are both safe and cost-effective. Their universality is evident in various solvents of polyhydric alcohols, in which multiple −OH groups not only involve in Zn²⁺ solvation but also interact with water, resulting in the high stability of electrolytes. Taking propylene glycol-based hydrated eutectic electrolyte as an example, it features significant advantages in non-flammability and low price that is <1/200 cost of Zn(CF₃SO₃)₂/Zn(TFSI)₂₋based eutectic electrolytes. Moreover, its effectiveness in confining the shuttle effects of I₂ cathode and side reactions of Zn anodes is evidenced, resulting in Zn-I₂ cells with high reversibility at 1 C and 91.4 % capacity remaining under 20 C. After scaling up to the pouch cell with a record mass loading of 33.3 mg cm⁻², super-high-capacity retention of 96.7 % is achieved after 500 cycles, which exceeds other aqueous counterparts. This work significantly broadens the eutectic electrolyte family for advanced Zn battery design.
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© 2023 The Authors. Angewandte Chemie published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.