Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries

Ji-Ping Gu; Kai-Yuan Zhang; Xiu-Ting Li; Jie Dong; Qing-Hua Zhang; Xin Zhao

doi:10.1007/s10118-022-2678-4

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Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries

RESEARCH ARTICLE | Updated：2022-03-28

- Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries
- Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries
- Chinese Journal of Polymer Science 2022年40卷第4期页码：345-354
- Affiliations：
  
  1.State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
- Author bio：
  
  xzhao@dhu.edu.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. U21A2087, 51903038 and 21975040).
- DOI：10.1007/s10118-022-2678-4
  中图分类号：
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Ji-Ping Gu, Kai-Yuan Zhang, Xiu-Ting Li, 等. Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2022,40(4):345-354.

Ji-Ping Gu, Kai-Yuan Zhang, Xiu-Ting Li, et al. Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2022,40(4):345-354.
Ji-Ping Gu, Kai-Yuan Zhang, Xiu-Ting Li, 等. Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2022,40(4):345-354. DOI： 10.1007/s10118-022-2678-4.

Ji-Ping Gu, Kai-Yuan Zhang, Xiu-Ting Li, et al. Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2022,40(4):345-354. DOI： 10.1007/s10118-022-2678-4.

摘要

Polyimide separators with spongy-like pore structure were prepared by non-solvent induced phase separation (NIPS), containing carboxyl groups which promote the desolvation of Li,+, ions and exhibiting excellent resistance to thermal shrinkage and flame retardant properties.

Abstract

With the wide applications of lithium-ion batteries (LIBs) in electronic devices and electric vehicles, it is of great importance to improve their safety and electrochemical performance. Herein, soluble polyimides (PI) containing carboxyl groups (―COOH) were synthesized by a simple one-step method and PI separators with sponge-like, interpenetrating porous structures were prepared ,via, non-solvent induced phase separation (NIPS). The obtained PI separators exhibited excellent thermal stability and fire-resistance properties, with the electrolyte uptake of 344% and good dimensional integrity in air at 200 °C. The results showed that the lithium-ion transference number of the obtained PI separator could reach 0.48, which was much higher than that of the Celgard-2400 separator (0.38). The Li/LiFePO,4, half-cell with the PI separator showed excellent cycle capability and high-rate performance with a high capacity of 121.80 mA·h·g,–1, at 5 C, which was better than that of the cell with the Celgard-2400 separator (54.3 mA·h·g,–1,), demonstrating the promising applications of this PI separators in LIBs.

关键词

Keywords

PolyimideSeparatorCarboxyl groupsNon-solvent induced phase separationLi transference number

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