文献类型：期刊文献

英文题名：A Trilayer Composite Separator with LiTFSI-Functionalized Silica Aerogel for Safe and Stable Lithium-Ion Batteries

作者：Zhou, Dengfeng Wu, Jiqiang Song, Jiling Guo, Jianbing He, Kun

第一作者：周登凤

通信作者：Song, JL[1]

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[2]Guizhou Jarwin Technol Co Ltd, Guiyang 550025, Peoples R China;[3]Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Peoples R China;[4]Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Peoples R China.

年份：2025

卷号：172

期号：12

外文期刊名：JOURNAL OF THE ELECTROCHEMICAL SOCIETY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001635051200001)】；

基金：This work was supported by the Natural Science Foundation of China (52063005), Major Science and Technology Special Project of Guizhou Province (Qiankehe Rencai XKBF [2025]006), Guizhou Province Science and Technology Achievement Transformation Project ([2025] general 020).

语种：英文

外文关键词：Lithium-ion batteries; silica aerogel; composite separator; Poly(vinylidene fluoride-co-hexafluoropropylene); electrochemical performance

摘要：Lithium-ion batteries (LIBs) are extensively used in modern energy storage systems but continue to face safety challenges related to thermal instability and dendritic growth. Conventional polyolefin separators exhibit limited thermal stability and are prone to failure under extreme conditions. In this study, a novel trilayer composite separator-denoted as PVDF-HFP/SiO2Li/PVDF-HFP (HFL)-was developed by incorporating lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) into a silica aerogel matrix via solution impregnation, followed by bilateral coating with PVDF-HFP. The resulting HFL separators demonstrated significantly enhanced thermal dimensional stability, flame retardancy, and electrolyte wettability. Electrochemical analyses revealed improved ionic conductivity (up to 2.934 mS cm-1) and lithium-ion transference number (up to 0.627), facilitating stable lithium deposition and suppressing dendrite formation. Long-term cycling tests showed exceptional capacity retention (99.1% after 100 cycles at 0.5 C and 82% after 800 cycles at 2 C) and remarkable stability under high current density. These findings underscore the potential of functionalized silica aerogel-based separators for enhancing the safety and performance of next-generation LIBs.