PEO-LiClO4-ZSM-5复合聚合物电解质——ZSM-5对锂离子选择通过的影响

通过溶液浇铸法制得了一系列以不同分子筛和蒙脱土为填料的PEO基复合聚合物电解质,利用交流阻抗-稳态电流方法研究了填料对复合聚合物电解质锂离子迁移数(TLi+)的影响.实验结果表明,所有填料都有利于同时提高复合聚合物电解质的TLi+和离子电导率,但以Li-ZSM-5为填料时TLi+最高,这是因为ZSM-5的特殊二维孔道结构有利于阳离子Li+的进入,而排斥阴离子ClO4-的通过.较高的TLi+和室温离子电导率说明PEO-LiClO4-ZSM-5有可能作为全固态锂离子聚合物电池的电解质材料.

PEO-LiClO4-ZSM-5 Composite Polymer Electrolyte--Effect of ZSM-5 on the Selective Transference of Lithium Ion

A series of polyethylene oxide(PEO)-based composite polymer electrolytes(CPE), with different kinds of molecular sieves and montmorillonite as the filler, were obtained by solvent casting method. The effects of the filler on the lithium-ion transference number(T_ Li+) of the CPE were investigated by the method of AC impedance coupled with steady-state current techniques. The experiment results showed that the addition of all kinds of fillers could improve T_ Li+ and enhance the ionic conductivity of PEO-LiClO_4 at the same time. However, the highest T_ Li+ of 0.353 was recorded by using Li-ZSM-5 as the filler. The special two-dimension frameworks of the ZSM-5, which might let the cation Li+ to pass through and prevent the passing of the anion ClO-_4, could be used to explain the enhancement of T_ Li+ induced by Li-ZSM-5. High T_ Li+ and RT ionic conductivity ensured the use of PEO- LiClO_4-ZSM-5 as the electrolyte materials for all solid-state rechargeable lithium ion batteries.