Observation of high ionic conductivity of polyelectrolyte microgels in salt-free solutions

Qiangwei Wang ¹Huijiao Liu ¹Mengjie Wang ¹Haojie Zhang ¹Jianda Xie ²Xuanwei Hu ¹Shiming Zhou ³Weitai Wu⁴

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作者信息

1. State Key Laboratory for Physical Chemistry of Solid Surfaces,Collaborative Innovation Center of Chemistry for Energy Materials,The Key Laboratory for Chemical Biology of Fujian Province,and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China
2. School of Materials Science and Engineering,Xiamen University of Technology,Xiamen 361024,China
3. Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China
4. State Key Laboratory for Physical Chemistry of Solid Surfaces,Collaborative Innovation Center of Chemistry for Energy Materials,The Key Laboratory for Chemical Biology of Fujian Province,and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China;School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China
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Abstract

Here,we report an observation that illustrate the potential of polyelectrolyte microgels in salt-free solu-tions to display a high ionic conductivity.Laser light scattering and ionic conductivity tests on very di-lute aqueous dispersions of the microgels indicate that both small size and swollen state of gel particles play vital roles,which should favor the counterions to freely penetrate and leave gel particles,and thus can contribute to the ion-conducting property.Upon discovering this on microgels that are composed of imidazolium-based poly(ionic liquid),we also illustrate the generality of the finding to single lithium-ion polyelectrolyte microgels that are of more technically relevant features for applications,for instance,as injectable liquid"microgel-in-solution"electrolytes of high conductivity(ca.8.2 × 10-2 S/m at 25.0 ℃ for 1.0 × 10-2 g/mL of microgels in a LiNO3-free 1∶1 v/v mixture of 1,2-dioxolane and dimethoxymethane)and high lithium-ion transference number(0.87)for use in the rechargeable lithium-sulfur battery.

Key words

Polyelectrolhyte/Stimuli-responsive/Single-ion conducting/Liquid electrolyte/Lithium metal battery

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基金项目

国家自然科学基金(21774105)

国家自然科学基金(20923004)

Chuying Plan Youth Top-notch Talents of Fujian Province()

National Fund for Fostering Talents of Basic Science(J1310024)

出版年

2024

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

参考文献量52

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