Electrospinning TiO2 Modified Biphenyl Polyimide Lithium Ion Battery Separator

doi:10.11901/1005.3093.2019.429

Chinese Journal of Materials Research

2020, Vol. 34

Issue (3): 169-175 DOI: 10.11901/1005.3093.2019.429

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Electrospinning TiO₂ Modified Biphenyl Polyimide Lithium Ion Battery Separator

GONG Guifen¹(

),LI Ze¹,WANG Lei²,CUI Weiwei¹

1. School of Materials Science and Engineering，Harbin University of Science and Technology，Harbin 150040，China
2. College of Materials Science and Chemical Engineering，Harbin Engineering University，Harbin 150001，China

Cite this article:

GONG Guifen,LI Ze,WANG Lei,CUI Weiwei. Electrospinning TiO₂ Modified Biphenyl Polyimide Lithium Ion Battery Separator. Chinese Journal of Materials Research, 2020, 34(3): 169-175.

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Abstract

TiO₂/PAA composite fiber membranes were prepared by high-voltage electrospinning, and then were thermally imidized to obtain TiO₂/PI composite fiber membranes. The physical properties, mechanical properties and electrochemical properties of TiO₂/PI composite fiber separators were assessed by means of scanning electron microscope, Fourier infrared spectrometer, thermogravimetric analyzer and electrochemical workstation. The results show that the membrane have clear three-dimensional network structure, and the tensile strength, the porosity and the liquid absorption rate of the modified TiO₂/PI composite membrane increase to 16.74 MPa, 77.5% and 550%, respectively comparing with the plain PI membrane; the membrane have good thermal shrinkage performance; excellent overall electrochemical performance; the prepared Li-battery of LiFePO₄ (lithium iron phosphate positive electrode)/TiO₂/PI/C (graphite negative electrode) presents excellent cycle stability and high discharge capacity, after 100 cycles at 1 C、at 25°C and 120°C, the cell coulombic efficiency is as high as 96.7% and 90.7%, respectively.

Key words: organic polymer materials TiO₂ biphenyl polyimides lithium battery separator electro-spinning electrochemical property

Received: 03 September 2019

ZTFLH:

TQ322.4+2

Fund: National Natural Science Foundation of China(51603075)

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	Guifen GONG
	Ze LI
	Lei WANG
	Weiwei CUI

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.429 OR https://www.cjmr.org/EN/Y2020/V34/I3/169

Fig.1 FTIR spectra of membranes

Fig.2 SEM images of TiO₂/PI composite membranes with different TiO₂content (mass fraction) (a) 0%, (b) 1%, (c) 2%, (d) 3%, (e) 4%, (f) 5%

Table 1 Porosity rate of TiO₂/PI composite membranes with different TiO₂ content （mass fraction）

Fig.3 Liquid absorption rate of TiO₂/PI composite me-mbranes with different TiO₂ content

Fig.4 TG curves of the TiO₂/PI composite membranes with different TiO₂ content

Table 2 Dimensional stability of PP, PI and TiO₂/PI separators at 100, 150, 200, 250℃

Fig.5 G curves of the TiO₂/PI composite membranes with different TiO₂ content

Fig.6 Decomposition voltage of membranes

Fig.7 Nyquist plots of PP、PI and TiO₂/PI membranes (a) “Li/separator/Li” system, (b) “SS/separator/SS” system

Fig.8 Cyclic performance for the cells with PP, PI and TiO₂/PI membranes at 1 C rate and different tem-perature (a) 25℃, (b) 120℃

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