High thermal and electrochemical stability of PVDF-graft-PAN copolymer hybrid PEO membrane for safety reinforced lithium-ion battery

Chang Yu Hsu, Ren Jun Liu, Chun Han Hsu, Ping Lin Kuo

研究成果: Article同行評審

41 引文 斯高帕斯(Scopus)

摘要

A polyvinylidene fluoride-graft-polyacrylonitrile (PVDF-g-PAN) copolymer was prepared by ozone polymerization and characterized by 1H-NMR. The as-prepared copolymer is a hybrid with polyethylene oxide (PEO), named m-PVDF, and was applied as a conductive gel-polymer electrolyte for lithium-ion batteries. According to morphology analysis, the m-PVDF membrane has less microphase separation than the PVDF blending with the PAN and PEO system (b-PVDF) which means that the PVDF-g-PAN copolymer can increase the compatibility of PVDF and PEO polymers. From the DSC analysis, introduction of PVDF-g-PAN effectively decreases the crystallinity of the PEO polymer in the m-PVDF membrane, which assists in lithium-ion transport. Moreover, m-PVDF shows high thermal stability up to 400°C and good dimensional-stability under 150°C, which can prevent the batteries from short-cutting and burning as well as other safety problems at high temperature. For battery application, the membrane shows good electrochemical stability up to 5 V (vs. Li/Li+). Furthermore, cells incorporating the m-PVDF membrane demonstrated remarkably excellent capacity retention with a capacity decay of only 9.1% after 300 cycles. Accordingly, these results suggest that the introduced PVDF-g-PAN significantly improved the electrolyte compatibility, thermal properties and wettability of the membrane, yielding a high-performance and high-safety electrolyte.

原文English
頁(從 - 到)18082-18088
頁數7
期刊RSC Advances
6
發行號22
DOIs
出版狀態Published - 2016

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)

指紋

深入研究「High thermal and electrochemical stability of PVDF-graft-PAN copolymer hybrid PEO membrane for safety reinforced lithium-ion battery」主題。共同形成了獨特的指紋。

引用此