Novel cross-linked copolymer gel electrolyte supported by hydrophilic polytetrafluoroethylene for rechargeable lithium batteries
Novel cross-linked copolymer gel electrolyte supported by hydrophilic polytetrafluoroethylene for rechargeable lithium batteries
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DOI：
10.1016/j.memsci.2013.08.029
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发表时间：
2014-01-01
影响因子：
9.5
通讯作者：
Nuli, Yanna
中科院分区：
文献类型：
--
作者：
Lu, Qingwen;Fang, Jianhua;Nuli, Yanna
以交联聚乙二醇和聚甲基丙烯酸缩水甘油酯嵌段共聚物（PEG-b-PGMA）为基材，采用阳离子开环聚合和原位交联法制备了新型亲水性聚四氟乙烯（PTFE）负载凝胶聚合物电解质（GPE）膜。PEG-b-PGMA的聚乙二醇侧链与液体电解质相互作用并将其保持在膜内，而亲水性和高多孔性PTFE膜为交联GPE提供机械支撑。优化后的GPE-3在25℃时离子电导率达到130 × 10(-3) S cm(-1)，足以应用于锂二次电池。与Li/Li+相比，GPE的电化学稳定性高达4.5 V。此外，优化后的GPE膜在高温下具有不可燃性和良好的尺寸稳定性，可以提高电池的安全性。使用GPE-3的锂/LiFePO4电池具有稳定的循环行为和优于传统液体电解质电池的倍率性能。因此，报道的GPE在可充电锂电池中的应用是非常有前景的。(C) 2013 Elsevier B.V.版权所有
A novel hydrophilic polytetrafluoroethylene (PTFE)-supported gel polymer electrolyte (GPE) membrane based on the cross-linked poly(ethylene glycol) and poly(glycidyl methacrylate) block copolymer (PEG-b-PGMA) is successfully prepared by cationic ring-opening polymerization and followed by in situ cross-linking process. The poly(ethylene glycol) side chains of PEG-b-PGMA interact with the liquid electrolyte and hold it inside the membrane, while the hydrophilic and highly-porous PTFE membrane offers mechanical support for the crosslinked GPE. The ionic conductivity of the optimized GPE-3 reaches 130 x 10(-3) S cm(-1) at 25 degrees C and is high enough to be applied in lithium secondary batteries. The GPE is electrochemically stable up to 4.5 V versus Li/Li+. Moreover, the optimized GPE membrane demonstrates non-flammability and good dimensional stability at elevated temperature, which can improve the safety of the cell. The Li/LiFePO4 cell using the GPE-3 exhibits stable cycling behavior and superior rate performance comparable to the cell based on conventional liquid electrolyte. Therefore, the reported GPE is very promising for the use in rechargeable lithium batteries. (C) 2013 Elsevier B.V. All rights reserved