Thermal Stability of Novel Polyvinyl Formal Based Gel Polymer Electrolyte†

doi:10.7503/cjcu20130822

Abstract

Abstract:

A novel polyvinyl formal(PVFM) based gel polymer electrolyte(GPE) was prepared by means of initiator free in-situ thermal polymerization technology. The thermal stability of electrolytes was studied using differential scanning calorimetry(DSC). And the components of evolved gases from GPE and liquid electrolyte were comparatively analyzed by thermogravimetry-infrared spectrum/mass spectrometry(TGA-FTIR/MS) technique during the heating process. The results show that the macroscopic physical network formed by PVFM after polymerization can prevent the organic solvents from evaporating and reduce HF content at high temperatures effectively. Overall, PVFM based GPE is a promising electrolyte to achieve the enhanced thermal stability and improved safety.

Key words: Lithium-ion battery, Gel polymer electrolyte, Polyvinyl formal, Thermal stability, Thermogravi-metry-Fourier transform infrared spectroscopy/Mass spectrometry combined technique

CLC Number:

TrendMD:

GUAN Hongyan, LIAN Fang, WEN Yan, PAN Xiaorong, SUN Jialin. Thermal Stability of Novel Polyvinyl Formal Based Gel Polymer Electrolyte^†[J]. Chem. J. Chinese Universities, 2014, 35(1): 80.

Figures/Tables 6

Fig.1 Molecular structure of PVFM

Fig.2 DSC curves of the PVFM(a), liquid electrolyte(b) and gel polymer electrolyte(c) with scanning rate 10 ℃/min under Ar flux

Fig.3 FTIR spectra of the evolved gas from liquid electrolyte(A) and PVFM based gel polymer electrolyte(B) by TGA-FTIR/MS technology

Fig.4 FTIR spectra of the evolved gas from liquid electrolyte(A) and PVFM basedgel polymer electrolyte(B) at 144 ℃ by TGA-FTIR/MS technology

Fig.5 Thermogravimetry-mass spectrum analysis of the evolved gas from liquid electrolyte(A) and GPE(B) by TGA-FTIR/MS technology

Table 1 Corresponding fragments and their assignments of the evolved gas from electrolytes detected by TGA-FTIR/MS technique*

m/z	LE	GPE	Corresponding fragment	Possible assignment
m/z	T_p/℃	T_p/℃	Corresponding fragment	Possible assignment
15	85	82—150	—CH₃	DMC, EC
18		151	H₂O, ·OH	H₂O, polymerization products
20			HF	Hydrolysis product of LiPF₆
28		82	CH₂CH₂, CO	CO₂/Decomposition products of EC
29	86	83—149	·C₂H₅, ·CHO	DMC, EC
30	87	81—149	CH₂O	EC
31	86	81—149	·CH₃O, ·CH₂OH	DMC
44	86	80	CO₂	Decomposition products of DMC/ring-opening polymerization product of EC
45	86	82—149	·COOH, ·C₂H₅O	DMC
59	84	81—147	·C₂H₃O₂	DMC

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