Facile and Nonradiation Pretreated Membrane as a High Conductive Separator for Li-Ion Batteries

ACS Applied Materials & Interfaces
Bao LiHaijiang Wang

Abstract

Polyolefin membranes are widely used as separators in commercialized Li-ion batteries. They have less polarized surfaces compared with polarized molecules of electrolyte, leading to a poor wetting state for separators. Radiation pretreatments are often adopted to solve such a problem. Unfortunately, they can only activate several nanometers deep from the surface, which limits the performance improvement. Here we report a facile and scalable method to polarize polyolefin membranes via a chemical oxidation route. On the surfaces of pretreated membrane, layers of poly(ethylene oxide) and poly(acrylic acid) can easily be coated, thus resulting in a high Li-ion conductivity of the membrane. Assembled with this decorated separator in button cells, both high-voltage (Li1.2Mn0.54Co0.13Ni0.13O2) and moderate-voltage (LiFePO4) cathode materials show better electrochemical performances than those assembled with pristine polyolefin separators.

References

Jan 27, 2005·Chemical Reviews·Pankaj Arora, Zhengming John Zhang
Jul 7, 2011·Physical Chemistry Chemical Physics : PCCP·Jason FangLi-Duan Tsai
Jan 9, 2013·Journal of the American Chemical Society·John B Goodenough, Kyu-Sung Park
Jul 30, 2014·Nanoscale·R D FarahaniD Therriault

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Citations

Feb 12, 2017·ACS Applied Materials & Interfaces·Jing LiLishi Wang
May 5, 2020·Chemical Communications : Chem Comm·Dongmei DaiBao Li
Dec 14, 2019·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Ali Akbar Heidari, Hossein Mahdavi

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