材料科学
膜
电解质
化学工程
聚合物
分离器(采油)
环氧乙烷
聚合物混合物
碳酸丙烯酯
高分子化学
复合材料
共聚物
化学
电极
物理化学
工程类
物理
热力学
生物化学
作者
Andrea La Monaca,Catia Arbizzani,Francesca De Giorgio,Maria Letizia Focarete,Davide Fabiani,Marco Zaccaria
出处
期刊:ECS transactions
[The Electrochemical Society]
日期:2016-08-30
卷期号:73 (1): 75-81
被引量:5
标识
DOI:10.1149/07301.0075ecst
摘要
Solid polymer electrolytes in lithium batteries have the dual function of electrolyte and separator to hinder lithium dendrite growth that causes hazardous short circuits during repeated charge/discharge cycles. Given the good compatibility between polyvinylidene difluoride (PVdF) and polyethylene oxide (PEO) and with the aim to merge the properties of these two polymers, we prepared and characterized PVdF/PEO membranes that act as separators and as hybrid gel polymer electrolytes when soaked in the liquid electrolyte with lithium salt. The membranes based on the polymer blends were prepared by electrospinning, a technique that yields micro-nanofibrous membranes with high porosity and, hence, huge values of electrolyte uptake. PEO 100,000 and PEO 1,000,000 were used to prepare two blends with PVdF:PEO 90:10 w/w composition. The electrochemical performance of the membranes, which were soaked in 1M LiPF 6 – ethylene carbonate:dimethyl carbonate (1:1 w/w), was evaluated in Li//LiFePO 4 and graphite//LiFePO 4 cells and discussed.
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