文献类型：期刊文献

英文题名：Boehmite particle coating modified microporous polyethylene membrane: A promising separator for lithium ion batteries

作者：Yang, Chongwen[1];Tong, Hua[1];Luo, Chuanpeng[1];Yuan, Shuanglong[1];Chen, Guorong[1];Yang, Yunxia[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2017

卷号：348

起止页码：80

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20171003416961);WOS:【SCI-EXPANDED(收录号:WOS:000399867300010)】；

基金：This study was supported by the Shanghai Science and Technology Committee Project (No. 15dz1201102).

语种：英文

外文关键词：Lithium ion batteries; Boehmite (AIOOH); Polyethylene (PE) separator; Thermal stability; Electrochemical compatibility; Overcharge protection

摘要：To exploit high-quality separators for lithium ion batteries, current research activities are mainly focused on the modification of microporous polyolefin membranes by coating them with inorganic particles to achieve comprehensive improvements in their thermal stability, electrochemical compatibility, and overcharge protection. Here, we report a separator made by coating boehmite (AIOOH) particles on microporous polyethylene (PE) membranes. Compared to the commercially applied coating materials, e.g., aluminum oxide (Al2O3), AIOOH allows for a substantial reduction in the coating thickness, while ensuring excellent thermal stability of the modified PE membrane. Our study shows that this is due to the formation of an interlocking interface structure that interconnects the PE membrane and AIOOH coating layer as soon as PE melts at about 140 degrees C, preventing the modified PE membrane from shrinking at subsequently elevated temperatures. The modified PE membrane exhibits suitable electrolyte wettability to facilitate ion transport through it. Thus, the lithium ion batteries employing it as a separator could attain substantially improved electrochemical performance. Furthermore, the AlOOH-coated PE separator was also found to provide an excellent overcharge protection. (C) 2017 Elsevier B.V. All rights reserved.