摘要
以Ni(OAc)2·4H2O、Co(OAc)2·4H2O、Mn(OAc)2·4H2O、LiOH·H2O在水和乙二醇混合溶剂中形成微粒溶胶-凝胶来合成锂离子蓄电池正极材料Li(Ni1/3Co1/3Mn1/3)O2。通过粉末X射线衍射分析、循环伏安实验、充放电实验等方法研究的结果表明,形成的微粒溶胶-凝胶在480℃预烧4h后,再在空气中800℃保温16h,补锂量5%(摩尔比),所得产物形成稳定的α-NaFeO2型层状有序晶体结构,在2.0～4.4V间,以30mA·g-1的电流放电,首次放电比容量达168.2mAh·g-1,经过25次循环后,放电比容量还有162.5mAh·g-1,容量衰减3.4%,显示出较高的初始放电比容量和良好的循环性能。
Li （Ni1/3Co1/3Mn1/3）O2 powder was prepared from particulate sol-gel method by reaction of Ni （OAc）2.4 H2O, Co （OAc）2· 4 H2O, Mn （OAc）2·4 H2O and LiOH. H2O in water -ethanol solvent system.The influence of synthesis conditions on the crystal framework and electrochemical properties were investigated by means of X-ray diffraction, cyclic voltammetry and charge-discharge cycling. The result showed that the optimum synthesis conditions was molar ratio n（Li） ： n（Ni） ： n（Co） ： n（Mn） = 1.05 ： 1/3 ： 1/3 ： 1/3,preheating at 480℃ for 4 h, calcined at 800℃ for 16 h in the air. Initial discharge specific capacity of 168.2 mAh .g^-1 was obtained in the range of 2.8-4.4 V at a specific current of 30 mAh.g^-1 and 162.5 mAh .g^-1 after 25 cycles,the capacity fading was 3.4%. It showed high initial discharge capacity and good cycling performance.
出处
《电源技术》
CAS
CSCD
北大核心
2006年第8期649-652,共4页
Chinese Journal of Power Sources
