电解质
材料科学
快离子导体
膜
聚合物
化学工程
聚乙烯
离子电导率
陶瓷
锂(药物)
电池(电)
电导率
相(物质)
离子液体
复合数
电极
复合材料
化学
有机化学
热力学
内分泌学
物理化学
工程类
催化作用
功率(物理)
生物化学
物理
医学
作者
Hanyu Huo,Ning Zhao,Jiyang Sun,Fuming Du,Yiqiu Li,Xiangxin Guo
标识
DOI:10.1016/j.jpowsour.2017.10.059
摘要
Paramount attention has been paid on solid polymer electrolytes due to their potential in enhancement of energy density as well as improvement of safety. Herein, the composite electrolytes consisting of Li-salt-free polyethylene oxides and 200 nm-sized Li6.4La3Zr1.4Ta0.6O12 particles interfacially wetted by [BMIM]TF2N of 1.8 μL cm−2 have been prepared. Such wetted ionic liquid remains the solid state of membrane electrolytes and decreases the interface impedance between the electrodes and the electrolytes. There is no release of the liquid phase from the PEO matrix when the pressure of 5.0 × 104 Pa being applied for 24 h. The interfacially wetted membrane electrolytes show the conductivity of 2.2 × 10−4 S cm−1 at 20 °C, which is one order of magnitude greater than that of the membranes without the wetted ionic liquids. The conduction mechanism is related to a large number of lithium ions releasing from Li6.4La3Zr1.4Ta0.6O12 particles and the improved conductive paths along the ion-liquid-wetted interfaces between the polymer matrix and ceramic grains. When the membranes being used in the solid-state LiFePO4/Li and LiFe0.15Mn0.85PO4/Li cells at 25 °C, the excellent rate capability and superior cycle stability has been shown. The results provide a new prospect for solid polymer electrolytes used for room-temperature solid-state lithium batteries.
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