聚丙烯腈
材料科学
电解质
陶瓷
复合数
锂(药物)
离子电导率
化学工程
分离器(采油)
复合材料
热稳定性
阳极
化学
电极
聚合物
工程类
物理
内分泌学
热力学
物理化学
医学
作者
Ji Hye Lee,Muthu Gnana Theresa Nathan,Hee Woong Kim,Sang‐Min Lee,Hongil Kim,Jin‐Hee Kim,Inseok Seo,Jae‐Kwang Kim
标识
DOI:10.1016/j.matchemphys.2022.126516
摘要
Polymer/ceramic composite gel electrolytes are considered promising alternatives to conventional liquid electrolytes for developing high-energy and safer lithium-ion batteries (LIBs). In this study, we prepare three polyacrylonitrile (PAN)/ceramic composite membranes with 40 wt% Al2O3, BaTiO3, and TiO2 ceramic nanoparticles and compared their properties with those of pristine PAN. Structural and morphological investigations confirm the formation of the polymer/ceramic composites. The interconnected microporous structure PAN/ceramic composites efficiently entrapped a large amount of liquid electrolyte and exhibit improved ionic conductivity compared to that of the pristine PAN electrolyte. The PAN/Al2O3 composite electrolyte displays the highest ionic conductivity of 5.2 × 10−3 S cm−1 under ambient conditions with low Li+-coordinated EC and high free PF6− concentration. Thermal shrinkage tests indicate that the addition of ceramic particles enhance the thermal stability of the PAN/ceramic membranes, as compared to that of commercial polyethylene separators. The PAN/ceramic composite electrolytes are tested as separator-cum-electrolytes in lithium-ion batteries using a LiNi0.8Co0.1Mn0.1O2 (NCM811) high-voltage cathode, and a lithium metal anode. The LIB with the PAN/Al2O3 composite electrolyte delivers a high capacity of 184 mAh g−1 at 0.5 C, which is retained at 85% after 100 cycles, demonstrating the best rate performance among all tested composite electrolytes.
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