Synthesis and Characterization of Cross-linked Solid Polymer Electrolyte Based on N-Cyanoethylated Polyethylenimine for Lithium-Ion Batteries

doi:10.19894/j.issn.1000-0518.200370

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (8): 946-953.DOI: 10.19894/j.issn.1000-0518.200370

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Synthesis and Characterization of Cross-linked Solid Polymer Electrolyte Based on N-Cyanoethylated Polyethylenimine for Lithium-Ion Batteries

WANG Xu-Yao^1,2,3,4, FANG Ying-Jun^1,2,3, ZHANG Ling-Zhi^1,2,3*

¹ Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
²CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
³Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
⁴University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-12-10 Revised:2021-03-06 Published:2021-08-01 Online:2021-10-01
Supported by:
National Natural Science Foundation of China (No.21573239), Guangdong Provincial Project for Science and Technology (No.2015B010135008), the Natural Science Foundation of Guangdong Province (No.2015A030313721), Guangdong Special Support Plan (No.2014TX01N014) and K. C. Wong Education Foundation

Abstract

Abstract: Solid polymer electrolytes have attracted much attention due to their non-volatility, low flammability and high safety. Herein, we synthesized a series of N-cyanoethylated branched polyethylenimine (CN-PEI) with different cyanoethylation numbers (0.3~5) through the Michael addition reaction between branched polyethylenimine and acrylonitrile. The polymer matrix CN-PEI was used to prepare cross-linked solid polymer electrolyte systems with lithium bis(trifluoromethanesulfonyl) imide as a lithium salt and tripropylene glycol diacrylate as a cross-linking agent. Subsequently, the chemical structure of CN-PEI was characterized by ¹H-nuclear magnetic resonance (NMR), C-H correlated spectroscopy (COSY) and Fourier transform infrared (FT-IR) spectrscopy. The introduction of cyano group in PEI significantly increases the ion conductivity of the crosslinked solid electrolytes. When the cyanoethylation number of CN-PEI is 1, the electrolyte exhibits the highest ionic conductivity (1.84×10^-5 S/cm at room temperature), lithium-ion transference number (0.56) and the solid electrolyte exhibits a high electrochemical stability, presenting an oxidation potential up to 5.0 V(vs.Li⁺/Li).

Key words: Lithium-ion batteries, Solid polymer electrolyte, Polyethylenimine, Acrylonitrile

CLC Number:

O633
TK02

WANG Xu-Yao, FANG Ying-Jun, ZHANG Ling-Zhi. Synthesis and Characterization of Cross-linked Solid Polymer Electrolyte Based on N-Cyanoethylated Polyethylenimine for Lithium-Ion Batteries[J]. Chinese Journal of Applied Chemistry, 2021, 38(8): 946-953.

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Synthesis and Characterization of Cross-linked Solid Polymer Electrolyte Based on N-Cyanoethylated Polyethylenimine for Lithium-Ion Batteries

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