Robust Composite Separator Randomly Interwoven by PI and Pre-oxidized PAN Nanofibers for High Performance Lithium-ion Batteries

Ying Li; Chen Pan; Feng Gan; Zhi-Xun Lin; Jin-Chao Yu; Zhen-Zhen Wei; Yan Zhao

doi:10.1007/s10118-024-3180-y

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Robust Composite Separator Randomly Interwoven by PI and Pre-oxidized PAN Nanofibers for High Performance Lithium-ion Batteries

RESEARCH ARTICLE | Updated：2024-11-04

- Robust Composite Separator Randomly Interwoven by PI and Pre-oxidized PAN Nanofibers for High Performance Lithium-ion Batteries
- Chinese Journal of Polymer Science Vol. 42, Issue 11, Pages: 1768-1779(2024)
- Affiliations：
  
  a.College of Textile and Clothing Engineering, National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China
  b.College of Textile Science and Engineering, Wuyi University, Jiangmen 529020, China
- Author bio：
  
  gf@dhu.edu.cn (F.G.)
  zzwei@suda.edu.cn (Z.Z.W.)
- Funds：
- DOI：10.1007/s10118-024-3180-y
  CLC：
- Received：12 April 2024，
  
  Revised：2024-05-28，
  
  Accepted：03 June 2024，
  
  Online First：13 September 2024，
  
  Published：30 November 2024
- Accepted：
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Li, Y.; Pan, C.; Gan, F.; Lin, Z. X.; Yu, J. C.; Wei, Z. Z.; Zhao, Y. Robust composite separator randomly interwoven by PI and pre-oxidized PAN nanofibers for high performance lithium-ion batteries. Chinese J. Polym. Sci. 2024, 42, 1768–1779

Ying Li, Chen Pan, Feng Gan, et al. Robust Composite Separator Randomly Interwoven by PI and Pre-oxidized PAN Nanofibers for High Performance Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2024, 42(11): 1768-1779.
Li, Y.; Pan, C.; Gan, F.; Lin, Z. X.; Yu, J. C.; Wei, Z. Z.; Zhao, Y. Robust composite separator randomly interwoven by PI and pre-oxidized PAN nanofibers for high performance lithium-ion batteries. Chinese J. Polym. Sci. 2024, 42, 1768–1779 DOI： 10.1007/s10118-024-3180-y.

Ying Li, Chen Pan, Feng Gan, et al. Robust Composite Separator Randomly Interwoven by PI and Pre-oxidized PAN Nanofibers for High Performance Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2024, 42(11): 1768-1779. DOI： 10.1007/s10118-024-3180-y.

摘要

In this work

a cross-electrospinning with heat treatment strategy to obtain a composite separator (PI/oPAN) randomly interwoven by PI and pre-oxidized PAN (oPAN) nanofibers was proposed. PI/oPAN separator reconcile high porosity wi

th superior mechanical strength because of the formation of a PI fibrous network adhered by the oPAN component. Moreover

obtained PI/oPAN separator presented high ionic conductivity and Li

transference number

resulting in a desirable and stable cell cycling performance.

Abstract

Electrospun nanofibrous separators

despite lacking superior mechanical strength

have gained widespread attention with high porosity and facile processing. Herein

utilizing the fact that thermal imidization temperature of poly(amic acid) (PAA) into polyimide (PI) coincides with the pre-oxidation temperature of polyacrylonitrile (PAN) into carbon fiber

we proposed a new cross-electrospinning strategy to obtain a composite nanofibrous separator (PI/oPAN) randomly interwoven by PI and pre-oxidized PAN (oPAN) nanofibers

via

synchronously electrospinning the PAA and PAN onto the same collector and then heat-treating for 2 h at 300 °C. The resultant PI/oPAN separator was able to preserve high porosity (71.7%)

electrolyte wettability and thermal stability of PI nanofibrous membrane

and surprisingly exhibited high mechanical strength

being 3 times of PI

which mainly because of the numerous adhesion points generated by the melting of PAN in the pre-oxidation process. Meanwhile

the polar groups of oPAN and 3D fibrous network enhanced the PI/oPAN separator’s ionic conductivity and Li

transference number

rendering the corresponding cell with more stable cycling performance than cells assembled with pure PI

PAN or commercial PP separator. Therefore

this work might provide a new avenue for the ongoing design and further development of LIB separators capable of high safety and high performance.

关键词

Keywords

references

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