锂锰氧化物在水溶液中的循环伏安行为  

Study on cyclic voltammetry of lithium manganese oxides in aqueous electrolyte

作　　者：陈前火[1] 童庆松[1] 连锦明[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《电源技术》2004年第2期84-87,共4页Chinese Journal of Power Sources

基　　金：福建自然科学基金课题(E 0110021);福建省教育厅课题(JA 02159;JB 0019)

摘　　要：用螯合法合成出用Li取代的Li1.01Mn1.99O4的电极材料。用原子吸收光谱测定其组成。用SEM、XRD、FTIR对其进行表征,并初步探讨了其在水溶液中的循环伏安行为。研究结果表明,在较慢的扫描速率下,Li1.01Mn1.99O4的循环伏安图在3.2 V附近出现1对氧化还原峰,在4.2 V附近出现2对氧化还原峰,分别对应于锂离子在尖晶石的嵌入或脱嵌过程。在饱和LiNO3溶液为电解液时镍网不能作为电极的集流体,而不锈钢网是一种很好的集流体。电池容量的损失可能来源于在高电位时水的氧化以及电极材料在水溶液中的溶解。这种电极材料在水溶液中具有较好的可充性能。The spinel lithium manganese oxide doped by lithium Li1.01Mn1.99O4 was synthesized by chelated method. AAS was used to determine it's composition, and XRD, SEM, FT-IR and cyclic voltammetry in aqueous electrolyte were also carried out. The results show that at the low scan rate, there are a voltammetric wave (centered at 3.2 V) and two voltammetric wave (centered at 4.2 V), correspond to Li+ insertion and removal in spinel in the cyclic voltammetry of Li1.01Mn1.99O4. In LiNO3 solution, nickel grid cannot be used as a current collector, whereas stainless steel grid is a good current collector. Water oxidation in high potential and dissolution in aqueous electrolyte perhaps play a role in capacity loss. The electrode material has better reversibility in aqueous electrolyte.

关 键 词：锂离子蓄电池 锂锰氧化物 水溶液 电极材料 循环伏安行为 

分 类 号：TM912.2[电气工程—电力电子与电力传动]