醋酸钾对尖晶石锰酸锂电化学性能的影响  

Effects of potassium acetate on electrochemical performance of spinel lithium manganese oxide

作　　者：王力臻[1,2] 孙新科[1] 彭天剑 张勇[1] 

机构地区：[1]郑州轻工业学院材料与化学工程学院,河南郑州450001 [2]河南省表界面科学重点实验室,河南郑州450001 [3]湖南汇通科技有限公司,湖南长沙410016

出　　处：《电池》2013年第2期84-87,共4页Battery Bimonthly

基　　金：河南省基础与前沿研究项目(112300413216)

摘　　要：用恒流充放电、循环伏安、电化学阻抗谱(EIS)、XRD和能量色散谱(EDS)等方法,研究了醋酸钾(KAc)对尖晶石锰酸锂(LiMn2O4)电化学性能的影响。当n(KAc)∶n(LiMn2O4)=1∶1 000时,产物的高倍率性能最佳,以2.0 C在3.0～4.3 V循环,放电比容量比未添加时提高了6.7%;循环400次的容量保持率为83.64%。KAc的作用机理是:CH3COO-对质子氢的吸收,以及K+参与正极表面膜形成并进入晶格的协同效应。Effects of potassium acetate（KAc） on electrochemical performance of spinel lithium manganese oxide （LiMn2O4 ） were studied by galvanostatic charge-discharge ,cyclic vohammetry, electrochemical impedance spectroscopy（ EIS）, XRD and energy dif-fraction spectrum（EDS） methods. When n（KAc） ： n（ LiMn2O4 ） = 1：1 000 ,the high rate performance of the product was the best. When cycled in 3.0-4. 3 V with 2. 0 C,the specific discharge capacity increased by 6. 7% compared with the blank one. The ca-pacity retention was 83.64% after 400 cycles. The promotion of KAc was achieved through the synergistic effect of adsorbing H^＋ by CH3 COO^- , participation in forming positive surface membrane and entrance into lattice by K^＋.

关 键 词：添加剂 锰酸锂(LiMn2O4) 醋酸钾(KAc) 性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]