A comparative study on polypropylene separators coated with different inorganic materials for lithium-ion batteries

Linghui Yu, Jiansong Miao, Yi Jin, Jerry Y.S. Lin

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PDF(328 KB)
Front. Chem. Sci. Eng. ›› 2017, Vol. 11 ›› Issue (3) : 346-352. DOI: 10.1007/s11705-017-1648-9
RESEARCH ARTICLE
RESEARCH ARTICLE

A comparative study on polypropylene separators coated with different inorganic materials for lithium-ion batteries

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Abstract

Coating commercial porous polyolefin separators with inorganic materials can improve the thermal stability of the polyolefin separators and hence improve the safety of lithium-ion batteries. Several different inorganic materials have been studied for the coating. However, there lacks a study on how different inorganic materials affect the properties of separators, in terms of thermal stability and cell performance. Herein, we present such a study on coating a commercial polypropylene separator with four inorganic materials, i.e., Al2O3, SiO2, ZrO2 and zeolite. All inorganic coatings have improved thermal stability of the separators although with differences. The coating layers add 28%–45% of electrical resistance compared with the pure polypropylene separator, but all the cells prepared with the coated polypropylene separators have the same electrical chemical performance as the uncoated separator in terms of rate capability and capacities at different temperatures.

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Keywords

lithium-ion battery / battery safety / composite separator / porosity / tortuosity

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Linghui Yu, Jiansong Miao, Yi Jin, Jerry Y.S. Lin. A comparative study on polypropylene separators coated with different inorganic materials for lithium-ion batteries. Front. Chem. Sci. Eng., 2017, 11(3): 346‒352 https://doi.org/10.1007/s11705-017-1648-9

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Acknowledgments

The authors gratefully acknowledge financial support from the China Electric Power Research Institute (CEPRI) on this project.

RIGHTS & PERMISSIONS

2017 Higher Education Press and Springer-Verlag Berlin Heidelberg
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