螯合法合成掺杂尖晶石型锂锰氧化物及其电化学性能研究  

Synthesis by Chelated Method and Electrochemical Characteristics of Spinel Lithium Manganese Oxides

作　　者：陈前火[1] 童庆松[1] 连锦明[1] 杨勇[2] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007 [2]厦门大学固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《福建师范大学学报（自然科学版）》2003年第3期44-48,共5页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省教育厅基金资助项目(JA02159;JB0019);福建省自然科学基金资助项目(E0110021)

摘　　要：用螯合法合成出掺杂镍和氯的尖晶石锂锰氧化物LizMn2-xNixO4-yCly.用能谱和原子吸收光谱分析测试了合成的样品的组成.分析了材料的电化学性能、FT-IR和XRD特性.结果表明:与没有掺杂的锂锰氧化物相比,掺杂量适当的样品其初始放电容量大,循环性能好,且在4.6～4.8V的电压平台较长.这归结于镍离子替换了部分处于16d的锰离子,使结构趋于更加稳定.The spinel lithium manganese oxides doped by nickel and chlorine LizMn2-xNixO4-yCly were synthesized by Chelated method. Energy spectrometer and AAS were used to determine their composition,and XRD,FTIR,crystalline parameters and electrochemical properties were researched. The results show that materials doped by nickel as require have higher first discharge capacity,better cyclic stability and longer charge platform in 46～48 V than pure spinel lithium manganese oxides. The reason is that the nickel ion displaces part manganese ion in 16d position and takes its position in spinel structure,thus the structure trends to be more steady.

关 键 词：捏离子电池 正极材料 掺杂尖晶石型锂锰氧化物 LixMn2-xNixO4-yCly 电化学性能 螯合法 放电容量 

分 类 号：TM912.2[电气工程—电力电子与电力传动] O646.54[理学—物理化学]