Preparation of a fast ion conducting membrane for rechargeable Cu-Zn batteries

doi:10.16085/j.issn.1000-6613.2017.01.035

Abstract

Abstract: Lithium fast ion conductor Li_1.3Al_0.3Ti_1.7(PO₄)₃ with NASICON structure is prepared by solid state reactions using NH4H₂,Li₂CO₃,TiO₂ and Al₂O₃ sintered at 900℃ for 5h. The powders are then pressed into tablets and calcined to prepare separators for conducting lithium ions. The effects of pressure, sintering temperature and the thickness on the ionic conductivities are studied. The phases and features of the membrane are investigated by X-ray diffraction and scanning electron microscope, respectively. The ionic conductivities are measured by AC impedance spectra. Optimal conditions referenced to fabricate the membrane are as follows:the pressure is 10.0MPa;the sintering temperature is 900℃ and the thickness is 0.500mm. The prepared membrane is employed to separate the cathode and the anode electrolytes apart,where lithium ions can freely pass through whereas other ions cannot. In this way we successfully assemble a rechargeable Cu-Zn battery. The working voltage of the resulting battery is 0.800-1.50V,and the charge capacity remains over 99% of its original capacity after 100 cycles,which shows a good cyclic stability.

Key words: electrochemistry, membranes, electrolytes, Cu-Zn battery

摘要： 具有NASICON结构的锂离子快离子导体Li_1.3Al_0.3Ti_1.7（PO₄）₃可以通过压片烧结制备成快离子导体隔膜。以NH₄H₂PO₄、Li₂CO₃、TiO₂和Al₂O₃为原料，用固相法在900℃烧5h合成Li_1.3Al_0.3Ti_1.7（PO₄）₃粉末，将其制备成锂离子快离子导体隔膜。研究了压力、烧结温度和厚度对Li_1.3Al_0.3Ti_1.7（PO₄）₃快离子导体隔膜离子电导率的影响，并采用X射线衍射、扫描电子显微镜和交流阻抗技术对材料粉末以及烧结片相组成、结构和离子导电性进行表征和测试分析。隔膜的最优制备条件为压力10.0MPa，烧结温度900℃，厚度0.500mm。将快离子导体隔膜用于Cu-Zn电池模型中，将正负电解液分开，使Li⁺能够自由地穿过，而其他离子不能通过，从而组装了可进行反复充放电的铜锌模型电池。通过循环伏安测试证实Cu-Zn电池的可逆性，所得可充电Cu-Zn模型电池的电压范围为0.800~1.50V，进行100次循环后充电容量保持初始充电容量99%以上，具有长期循环稳定性。

关键词: 电化学, 膜, 电解质, Cu-Zn电池

CLC Number:

O646

ZHOU Yisen, LIANG Shanshan, YANG Chao, ZHU Tian, ZHANG Hangping. Preparation of a fast ion conducting membrane for rechargeable Cu-Zn batteries[J]. Chemical Industry and Engineering Progree, 2017, 36(01): 282-288.

周贻森, 梁姗姗, 杨超, 朱甜, 张汉平. 快离子导体隔膜的制备及在Cu-Zn可逆电池中的应用[J]. 化工进展, 2017, 36(01): 282-288.

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