Preparation and Properties of Poly（ether ether ketone）/Carbon Nanotube Modified Polypropylene Janus Composite Separator

doi:10.19894/j.issn.1000-0518.220065

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (12): 1862-1869.DOI: 10.19894/j.issn.1000-0518.220065

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Preparation and Properties of Poly（ether ether ketone）/Carbon Nanotube Modified Polypropylene Janus Composite Separator

Xin-Wei DU¹, Wen-Jie ZHAO¹, Wei HU¹^,²(), Zhao-Yan SUN³, Wan-Li LIU, Tian-Lei REN, Ming-Xing FU

^1.School of Chemical Engineering，Changchun University of Technology，Changchun 130012，China
^2.College of Chemistry，Northeast Normal University，Changchun 130024，China） 3（State Key Laboratory of Polymer Physics and Chemistry，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China） 4（Zhongke Kinhua Changchun High-Tech Company，Changchun 130000，China） 5（China Nuclear Power Engineering Company，Shenzhen 518000，China

Received:2022-03-10 Accepted:2022-07-01 Published:2022-12-01 Online:2022-12-13
Contact: Wei HU
Supported by:
the National Natural Science Foundation of China(52073044);the NSFC Regional Innovation and Development Funding(U21A20330);the Science and Technology Development Plan of Jilin Province, China(20200401036GX);the Jilin Provincial Development and Reform Commission, China(2021C036-2);the Key R&D Plan of Changchun Science and Technology Bureau(21ZY32);the Changchun New Area“Changbai Huigu”Talent Project, China(9-2020004);the Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences(2021-25)

Abstract

Abstract:

Lithium-ion batteries （LIBs） have attracted wide attention because of their broad prospects in electric vehicles. However， the safety problems and low multiplier performance of the commercial polyolefin separator limit their further development， due to the poor dimensional thermal stability and low electrolyte absorption rate. Poly（ether ether ketone）（PEEK） and carbon nanotube （CNT） are compounded to coat on polypropylene （PP） to prepare Janus composite separator （PP@C） through the phase inversion method. PP@C composite separator does not deform at 180 ℃ for 0.5 h （only slight deformation）， illustrating excellent thermal stability. The electrolyte absorption rate of PP@C2 is 193.8%. The electrolyte uptake rate of the PP@C2 composite membrane was 193.8%， which was 64.5% higher than the PP membrane， showing a superduper electrolyte permeability. As a result， the specific discharge capacity of LIBs assembled with PP@C2 composite separator is 157.6 mA·h/g at 0.2 C and 129.8 mA·h/g at 2 C， showing good rate performance with the capacity recovery rate of more than 99%. This might be attributed to the ultra-high thermal stability of PEEK， the good affinity of the electrolyte， the high conductivity of CNT， as well as the uniform dispersion of Li⁺， so that the separator can have excellent electrochemical performance while improving safety.

Key words: Polyether ether ketone, Carbon nanotube, Phase inversion, Dimensional thermal stability, Janus composite separator

CLC Number:

O625.4

Xin-Wei DU, Wen-Jie ZHAO, Wei HU, Zhao-Yan SUN, Wan-Li LIU, Tian-Lei REN, Ming-Xing FU. Preparation and Properties of Poly（ether ether ketone）/Carbon Nanotube Modified Polypropylene Janus Composite Separator[J]. Chinese Journal of Applied Chemistry, 2022, 39(12): 1862-1869.

Figures/Tables 4

Table 1 Physical properties of separators

复合隔膜

Composite membrane

臭氧用量

m（Ozone）/g

厚度

Thick ness/μm

孔隙率

Porosity/%

吸液率

Electrolyte uptake/%

热收缩率

Thermal shrinkage/%

Fig.1 Images of separators before （A-C） and after （D-F） heat treatment at 180 ℃ for 0.5 h， respectively

Fig.2 （A） TEM image of the CNT； SEM images of the surface of PP@C composite separators （B） PP，（C） PP@C2，（D） PP@C5

Fig.3 Electrochemical properties of the PP@C composite separators：（A） EIS graph；（B） Electrochemical impedance curves；（C） Cycling performances of Li/separator/LiFePO4 batteries；（D） C-rate discharge capacity

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Preparation and Properties of Poly（ether ether ketone）/Carbon Nanotube Modified Polypropylene Janus Composite Separator

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