掺杂Bi_2O_3锌酸钙的电化学性能研究  

Study on electrochemical properties of Bi_2O_3-doped calcium zincate

作　　者：李加勇 刘远鹏[2] 李晓峰[2] 崔超群[3] 

机构地区：[1]河南新太行电源股份有限公司,河南新乡453002 [2]郑州轻工业学院材料与化学工程学院,河南郑州450001 [3]中国人民解放军空军驻新乡地区军事代表室,河南新乡453002

出　　处：《电源技术》2017年第6期907-908,931,共3页Chinese Journal of Power Sources

摘　　要：采用液相共沉淀法制备了掺杂Bi_2O_3的锌酸钙粉末。X射线衍射测试表明,共沉淀的Bi没有进入锌酸钙的晶格而是以Bi_2O_3的形式析出并部分沉积在锌酸钙表面。恒电流充放电测试结果表明,Bi_2O_3在首次充电时能够转化为金属Bi并稳定存在于锌酸钙电极中。与未掺杂电极相比,掺杂10%(质量分数)Bi_2O_3后,锌酸钙电极的0.2 C比容量由391m Ah/g提高至433 m Ah/g,1 C比容量由372 m Ah/g提高至389 m Ah/g,3 C比容量由312 m Ah/g提高至330 m Ah/g,1 C循环30次后容量保持率由61%提高到92%。Bi2O3-doped calcium zincate powder was prepared by the liquid co-precipitation method. The results of X-ray diffraction tests show that Bi is not introduced into the crystal lattice of calcium zincate during the co-precipitation; Bi2O3 is separated out and partially deposited on the surface of calcium zincate. The results of galvanostatic charge-discharge tests show that Bi2O3 is converted into metal Bi during initial charge and metal Bi can be stable in the calcium zincate electrode. Compared with the undoped electrode, the specific capacity of the calcium zinc electrode with 10% Bi2O3 increases from 391 mAh/g to 433 mAh/g at 0.2 C; the specific capacity increases from 372 mAh/g to 389 mAh/g at 1 C ; the specific capacity increases from 312 mAh/g to 330 mAh/g at 3 C;, the capacity retention increases from 61% to 92% at 1 C after 30 cycles.

关 键 词：锌酸钙 BI2O3 掺杂 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]