摘要
用溶液途径合成出用Li和Ni取代Li1.03Mn1.80Ni0.17O4的电极材料.用XRD、FTIR、XPS对其结构及表面性能进行了表征,并研究了其在水溶液中的电化学性能.研究结果表明:该样品呈现典型的尖晶石结构,不存在杂晶相,在物质表面锰为+3和+4的混合价,但比较接近+4价,镍为+3价.循环伏安实验显示在0.8 V和0.92 V(vs.SCE)附近出现二对氧化还原峰,分别对应于锂离子的二步嵌入或脱嵌过程.在水溶液中的充放电实验显示该样品的初始放电容量为64.5 mAh/g,到30个循环以后,样品的放电容量稳定在77.0 mAh/g附近.说明该正极材料在水溶液中很稳定,且具有相当能量.
Li1.03Mn1.80Ni0.17O4 co-doped by lithium and nickel was prepared by liquid way. XRD, FT-IR and XPS were used to determined its structure and surface performance, electrochemical experiments in aqueous electrolyte were also carried out. The results show the sample is typical spinel without impurity, in the surface of the material the oxidation state of manganese is ＋3 and ＋4, and is close to ＋4, the oxidation state of nickel is ＋3. There are two voltammetric waves were centered at 0.8 V and 0.92 V （vs. SCE）, corresponded to Li^＋ two times insertion and extraction in the cyclic voltammetry of Li1.03 Mn1.80Ni0.17O4. Charge/discharge experiments in aqueous electrolyte show the initial discharge capacity is 64.5 mAh/g, after 30 cycles the discharge capacity stables at 77 mAh/g. It indicates the positive material is very stability and has a fair capacity in aqueous electrolyte.
出处
《福建师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第4期58-62,共5页
Journal of Fujian Normal University：Natural Science Edition
基金
福建省自然科学基金资助项目(E0110021)
福建省教育厅基金资助项目(JA02159
JB03137)
福建师范大学青年教师扶苗基金(F023)
