摘要
采用固相反应和湿化学两种方法合成了材料LiNixMn2-xO4。含Ni量影响材料在4.7V高电压区间的容量,用固相反应法制备的LiNi0.5Mn1.5O4中含有杂相物质,首次放电容量可以达到118mAh/g,其中高电压区的容量为100mAh/g,循环50次的容量保持率为97%。用湿化学法可以得到纯相的LiNi0.5Mn1.5O4,首次放电容量为140mAh/g,其中高电压区的容量为125mAh/g,循环50次后,容量仍能达到133mAh/g,容量保持率为95%。XPS检测结果表明,湿化学法制备的LiNi0.5Mn1.5O4中Mn为+4价,Ni为+2价。
Solid-state method and wet method were employed to synthesize spinel compounds LiNixMn2-xO4.The experimental results indicate that the capacity of high voltage at 4.7 V increase with the increase of amount of Ni. There are impurities in LiNixMn2-xO4 which were made by solid-state method. The sample LiNi0.5Mn1.5O4 had a capacity of 121 mAh/g at first cycle, in which 100 mAh/g was at high voltage range. Its cycle retention rate after 50 cycles was over 92%. The LiNi0.5Mn1.5O4 synthesized by wet method show a single spinel phase without impurity phase. It deliver a discharge capacity of 140 mAh/g in the first cycle, in which 125 mAh/g was at high voltage range. Its cycle retention rate after 50 cycles was over 96%. The XPS experiment results indicate that the oxidation states of Ni and Mn in LiNi0.5Mn1.5O4 made by wet method are ＋2 and ＋4 respectively.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期299-302,共4页
Rare Metal Materials and Engineering
基金
中国博士后科学基金资助(2004035022)
