Aluminum Diethylphosphinate-Incorporated Flame-Retardant Polyacrylonitrile Separators for Safety of Lithium-Ion Batteries

Polymers

Sung Kwon Hong¹  Jaewon Choi²  Jang Yong Lee³  Tae Ho Kim³  Young Taik Hong³  Soonyong So³  Sang Jun Yoon³  Duk Man Yu³  Hwan Yeop Jeong³  Seok Hyeon Kang³ 

[1] Department of Polymer Engineering, Chungnam National University, Daejeon 34134, Korea;Department of Polymer Science and Engineering, Kyungpook National University, Daegu 41566, Korea;Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea;

关键词: polyacrylonitrile separator;    phosphinate;    heat resistance;    flame retardant;    lithium-ion battery;   

DOI  :  10.3390/polym14091649

来源: DOAJ

【 摘 要 】

Herein, we developed polyacrylonitrile (PAN)-based nanoporous composite membranes incorporating aluminum diethylphosphinate (ADEP) for use as a heat-resistant and flame-retardant separator in high-performance and safe lithium-ion batteries (LIBs). ADEP is phosphorus-rich, thermally stable, and flame retardant, and it can effectively suppress the combustibility of PAN nanofibers. Nanofibrous membranes were obtained by electrospinning, and the content of ADEP varied from 0 to 20 wt%. From the vertical burning test, it was demonstrated that the flame retardancy of the composite membranes was enhanced when more than 5 wt% of ADEP was added to PAN, potentially increasing the safety level of LIBs. Moreover, the composite membrane showed higher ionic conductivity and electrolyte uptake (0.83 mS/cm and 137%) compared to those of commercial polypropylene (PP) membranes (Celgard 2400: 0.65 mS/cm and 63%), resulting from interconnected pores and the polar chemical composition in the composite membranes. In terms of battery performance, the composite membrane showed highly stable electrochemical and heat-resistant properties, including superior discharge capacity when compared to Celgard 2400, indicating that the PAN/ADEP composite membrane has the potential to be used as a heat-resistant and flame-retardant separator for safe and high-power LIBs.

【 授权许可】

Unknown