Zn-La合金制备及其电化学性能研究  

Preparation and Electrochemical Preformance of Zn-La Alloys

作　　者：孟宪玲[1] 杨化滨[1] 杨恩东[1] 王晓丹[1] 张海昌[1] 王军红[1] 周作祥[1] 

机构地区：[1]南开大学新能源材料化学研究所,天津300071

出　　处：《电化学》2003年第2期133-138,共6页Journal of Electrochemistry

基　　金：国家自然科学基金(59901005);天津市自然科学基金重点基金(013802611)资助

摘　　要：　采用固相扩散法合成Zn＿La合金,并研究La对锌电极化学性能的影响.实验表明:La的适量添加能抑制锌电极的枝晶及腐蚀等问题,从而明显改善锌电极的循环性能,其中以0.5at.%La的添加量为最佳.在100mA/g电流密度下,循环80周期后,其放电容量仍达520mAh/g,XPS测试表明,La主要以La2O3/La(OH)3的形式附着在锌电极表面上.正是由于La2O3/La(OH)3的存在,显著改善了锌电极的循环充放电寿命.Zn_La alloys were prepared by solid phase diffusion method and the effects of La on the electrochemical performance of zinc electrodes were investigated using potentiostatic polarization technique and charging/discharging cycle test. The results showed that adding La to zinc electrode remarkably suppressed the zinc dendrite, the shape of zinc electrode and zinc corrosion, and hence, markedly improved the cycle performance of zinc electrodes. The discharging capacity of the zinc electrode containing 0.5at.% La which was the optimum was still 520 mAh/g after it cycled 80s at the current of 100 mA. The XPS showed that La element mainly adhered on the surface of the zinc electrode in the form of La2O3/La(OH)3 that evidently enhanced the cycle life of the secondary zinc electrode.

关 键 词：电化学性能 Zn-La合金 制备 固相扩散法 合成 锌镧合金 

分 类 号：O646[理学—物理化学]