Heat-resistant Al_(2)O_(3) nanowire-polyetherimide separator for safer and faster lithium-ion batteries  

作　　者：Wenqiang Hu Wenbin Fu Samik Jhulki Liang Chen Aashray Narla Zhijian Sun Fujia Wang Alexandre Magasinski Gleb Yushin 

机构地区：[1]School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA [2]Institute of Materials Science and Engineering,School of Mechanical and Electronic Control Engineering,Beijing Jiaotong University,Beijing 100044,China [3]Sila Nanotechnologies Inc,Alameda,CA 94501,USA [4]School of Chemistry and Chemical Engineering,Hunan Institute of Science and Technology,Yueyang,Hunan 414006,China

出　　处：《Journal of Materials Science & Technology》2023年第11期112-120,共9页材料科学技术（英文版）

基　　金：financially supported by Sila Nanotechnologies,Inc.(Sila);additional fellowship support of China Scholarship Council;supported by the National Science Foundation(No.ECCS-2025462).

摘　　要：Poor heat/flame-resistance of polyolefin(e.g.,polyethylene and polypropylene)separators and high flammability of organic electrolytes used in today’s lithium-ion batteries(LIBs)may trigger rare yet potentially catastrophic safety issues.Here,we mitigate this challenge by developing a heat-resistant and flame-retardant porous composite membrane composed of polyetherimide(PEI)and Al_(2)O_(3) nanowires(NWs).The membranes are fabricated based on an industrially scalable non-solvent-induced phase separation process,which results in an intimately interconnected porous network of Al_(2)O_(3) NWs and PEI.The produced composite membranes exhibit excellent flexibility,thermal stability,and flame-retardancy.Importantly,the composite membranes exhibit minimal thermal shrinkage and superior tensile strength(16 MPa)at temperatures as high as 200℃,significantly exceeding the performance of conventional polyolefin separators.Compared with commercial separators,their superior wettability and higher ionic conductivity(by up to 2.4 times)when filled with the same electrolyte,larger electrolyte uptake(-190 wt.%),as well as improved cycle and rate performance demonstrated in LiNiMnCoO_(2)(NCM)-based LIBs make them attractive choices for a variety of electrochemical energy storage devices.

关 键 词：Lithium-ion batteries SEPARATORS Al_(2)O_(3)NWs POLYETHERIMIDE Thermal resistance 

分 类 号：TB33[一般工业技术—材料科学与工程]