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Issue 107, 2016, Issue in Progress
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Preparation and evaluation of a separator with an asymmetric structure for lithium-ion batteries

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Abstract

The different electrochemical characteristics stemming from the cathode and anode of lithium-ion batteries may have different effects on the surface properties of contacted separators. Herein, a series of composite separators with an asymmetric porous structure are fabricated by a one-step phase inversion method coupled with the settling of SiO2 nanoparticles due to gravity within the poly(vinylidenefluoride-co-hexafluoropylene) (PVDF-HFP) polymer matrix. The unique asymmetric porous separators are composed of a PVDF-HFP-rich layer with high porosity on the front surface, which is in contact with the air, and a SiO2-rich layer on the back surface, which is in contact with the substrate. Besides their excellent thermal stability and high safety towards fire, these asymmetric porous separators result in a high discharge capacity, enhanced cycling performance and excellent rate capability when assembled with a LiNi0.5Mn1.5O4 cathode in coin cells, indicating that the asymmetric porous composite separators could be a promising candidate to improve the performance of lithium-ion batteries.

Graphical abstract: Preparation and evaluation of a separator with an asymmetric structure for lithium-ion batteries

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Article information


Submitted
22 Aug 2016
Accepted
31 Oct 2016
First published
01 Nov 2016

RSC Adv., 2016,6, 105461-105468
Article type
Paper

Preparation and evaluation of a separator with an asymmetric structure for lithium-ion batteries

Y. Wang, S. Zhu, D. Sun and Y. Jin, RSC Adv., 2016, 6, 105461 DOI: 10.1039/C6RA21089A

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