新型硼酸基离子液体基三元凝胶聚合物电解质用于可充电 Li/LiCoO2 电池的电化学和循环性能增强。
An enhanced electrochemical and cycling properties of novel boronic Ionic liquid based ternary gel polymer electrolytes for rechargeable Li/LiCoO cells.
机构信息
Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, South Korea.
Polymer Materials Lab, Department of Chemical and Biomolecular Engineering, Sogang University, 35 Baekbeom-ro,Mapo-gu, Seoul, 04107, South Korea.
出版信息
Sci Rep. 2017 Sep 11;7(1):11103. doi: 10.1038/s41598-017-11614-1.
A new generation of boronic ionic liquid namely 1-ethyl-3-methylimidazolium difluoro(oxalate)borate (EMImDFOB) was synthesized by metathesis reaction between 1-ethyl-3-methylimiazolium bromide and lithium difluoro(oxalate)borate (LiDFOB). Ternary gel polymer electrolyte membranes were prepared using electrolyte mixture EMImDFOB/LiDFOB with poly vinylidenefluoride-co-hexafluoropropylene (PVdF-co-HFP) as a host matrix by facile solvent-casting method and plausibly demonstrated its feasibility to use in lithium ion batteries. Amongst ternary gel electrolyte membrane, DFOB-GPE3, which contained 80 wt% of EMImDFOB/LiDFOB and 20 wt% PVdF-co-HFP, showed excellent electrochemical and cycling behaviors. The highest ionic conductivity was found to be 10 Scm at 378 K. Charge-discharge profile of Li/DFOB-GPE3/LiCoO coin cell displayed a maximum discharge capacity of 148.4 mAhg at C/10 rate with impressive capacity retention capability and columbic efficiency at 298 K.
新一代硼酸离子液体 1-乙基-3-甲基咪唑二氟（草酸）硼酸酯（EMImDFOB）是通过 1-乙基-3-甲基咪唑溴化物与二氟（草酸）硼酸锂（LiDFOB）之间的复分解反应合成的。采用聚偏氟乙烯-六氟丙烯（PVdF-co-HFP）作为主体基质的电解质混合物 EMImDFOB/LiDFOB 通过简单的溶剂浇铸法制备了三元凝胶聚合物电解质膜，并合理地证明了其在锂离子电池中的应用可行性。在三元凝胶电解质膜中，含有 80wt%的 EMImDFOB/LiDFOB 和 20wt%PVdF-co-HFP 的 DFOB-GPE3 表现出优异的电化学和循环性能。在 378K 时，发现最高离子电导率为 10 Scm。Li/DFOB-GPE3/LiCoO 扣式电池的充放电曲线在 298K 时以 C/10 速率显示出最大放电容量为 148.4mAhg，具有令人印象深刻的容量保持能力和库仑效率。
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