Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries Author links open overlay panel  

作　　者：Ying Jiang Chen Sun Feilong Dong Haiming Xie Liqun Sun 

机构地区：[1]National&Local United Engineering Laboratory for Power Battery,Department of Chemistry,Northeast Normal University,Changchun,130024,China

出　　处：《Particuology》2024年第8期29-37,共9页颗粒学报（英文版）

基　　金：supported by Jilin Province Science and Technology Department major science and technology project(grant numbers 20220301004GX,20220301005GX);Key Subject Construction of Physical Chemistry of Northeast Normal University,the Education Department of Jilin Province science and technology project of“13th Five-Year”(grant number JJKH20200764KJ);the Fundamental Research Funds for the Central Universities(grant number 135113014).

摘　　要：The separator plays an important part in battery safety and performance.Polyolefin separators are widely used in commercial Lithium-ion batteries(LIBs),owing to their excellent properties,but they suffer from serious thermal shrinkage and poor electrolyte wettability.Thus,a multilayer separator(ASPESA)is developed by coating two thin layers of low-density polyethylene(LDPE)and Al_(2)O_(3)on both sides of a polyethylene membrane using a facile and environmentally friendly casting technique.The ASPESA separator demonstrates a shutdown function at 120℃and shows enhanced thermal stability under 185℃,with a small thermal shrinkage of 1%.Meanwhile,the LDPE and Al_(2)O_(3)layers can improve the electrolyte wettability and electrolyte uptake(407.23%).The multilayer ASPESA separator delivers an excellent cycle performance in LiFePO_(4)||Li cells with a discharge capacity of 144.5 mAh g^(-1)after 900 cycles,with a high-capacity retention of 98.9%(compared to the 5th cycle).Therefore,the multilayer ASPESA separator has great utilization potential as a high-safety separator in LIBs.

关 键 词：Low-density polyethylene microspheres Al_(2)O_(3)particles Thermal shutdown High safety LITHIUM-IONBATTERIES 

分 类 号：TM912[电气工程—电力电子与电力传动]