journal article·2024-08-09

Cationic Porous Aromatic Frameworks for Enhanced Lithium-Ion Dissociation and Transport in Solid Polymer Electrolytes

Tingting Ma, Zhangnan Li, Ruyi Ma, Hua Feng, Yuhui Zhai, Zhi Gao, Yuyang Tian, Zhong-Min Su

ACS Energy Letters· Volume 9· Issue 8
Publisher page

Abstract

It poses a challenge to promote the dissociation of strong ion pairs of lithium salts and the rapid transport of Li + in solid-state polymer electrolytes. In this study, the cationic porous aromatic frameworks (iPAF-7) containing imidazolium groups were prepared by constructing an anion-receptor strategy. The cationic imidazolium groups were used to limit anions via electrostatic interactions and reduce the dissociation energy barrier of Li +, thus promoting the dissociation and transport of Li + . Density functional theory (DFT) calculations further confirmed that the constraining effect of iPAF-7 on TFSI – promoted the effective dissociation of Li +, significantly reduced concentration polarization, and ultimately inhibited lithium dendrites. iPAF-7-QSPE showed stable lithium plating/stripping behavior; it maintained a uniform polarization for over 4500 h at a current density of 0.2 mA cm –2 . The discharge specific capacity of Li//iPAF-7-QSPE//LFP reached as high as 167 mAh g –1 at 0.2 C. After 600 cycles, it maintained an acceptable capacity retention of 89%.
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Research context

OpenAlex topics: Covalent Organic Framework Applications · Advanced Battery Materials and Technologies · Advancements in Battery Materials

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Affiliations

School of Chemical and Environmental Engineering, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Jilin Provincial International Joint Research Center of Photo-functional Materials and Chemistry, Changchun University of Science and Technology, Changchun 130022, P. R. China

School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, P. R. China

Department of Academic Affairs, Changchun Normal University, Changchun 130032, China

College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, P. R. China

Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China

State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130021, P. R. China

Funding

National Natural Science Foundation of China

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