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Preparation and performance investigation of sulfonate-functionalized COFs

Authors： WANG Yinggu1, LI Meijun1, ZHOU Hangyu2, 3, LI Zhen4

Units： 1. School of Intelligent Building Engineering, Nanchang Institute of Technology, Nanchang 330044, China; 2. China Academy of Safety Science and Technology, Beijing 100012, China; 3. Key Laboratory of Electrochemical Energy Safety, MEM, Beijing 100012, China; 4. School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China

KeyWords： covalent organic frameworks; post-modification strategy； sulfonate functional groups； composite electrolyte thin films

ClassificationCode：TB34

year,volume(issue):pagination： 2026,46(2):143-152

Abstract：

Covalent organic frameworks (COFs) possess the orderliness characteristic of inorganic materials and the flexibility in polymer structure design, along with excellent thermal stability and an ordered pore structure, which have shown great potentials for application in the field of solid-state electrolytes. The reported sulfonate-functionalized COFs exhibit strong electronegativity, a high degree of charge delocalization and excellent ion dissociation ability, which have garnered significant attention. However, the reported sulfonate-functionalized COFs possess a single structure, which significantly restricts their capacity to enhance electrolyte performance and impedes further advancement in this field. In this study, TDCOF60CHO containing active aldehyde anchoring sites was first prepared. Afterwards, by employing post-modification strategy, sulfonate functional groups were introduced into the pore walls of COFs to obtain the functional TDCOF60SO3Li. Finally, COFs/PEO composite electrolyte thin films were fabricated via the solution casting method. As a result, the lithium-ion conductivity was 1.03×10-4 S/cm at 30 ℃, accompanied by an electrochemical window of up to 5.26 V. Simultaneously, it demonstrated excellent interfacial stability and the capacity to inhibit the growth of lithium dendrites, indicating significant potential for practical applications.

Funds：

国家重点研发计划(2023YFC3008702)；应急管理部重点科技计划(2025EMST110301)；国家消防救援局科技计划(2024XFCX17)；江西省自然科学基金（20232BAB214031， 20242BAB25237）

AuthorIntro：

王英姑（1990-），女，讲师，研究方向为有机多孔材料功能应用研究

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