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

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• 作者：Bao Li ; Yongjun Li ; Dongmei Dai ; Kun Chang ; Hongwei Tang ; Zhaorong Chang ; Chunru Wang ; Xiao-Zi Yuan ; Haijiang Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：7
• 期：36
• 页码：20184-20189
• 全文大小：348K
• ISSN：1944-8252

文摘

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 (Li_1.2Mn_0.54Co_0.13Ni_0.13O₂) and moderate-voltage (LiFePO₄) cathode materials show better electrochemical performances than those assembled with pristine polyolefin separators.