锂离子电池正极材料Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2的合成及电化学性能研究

Synthesis and Electrochemical Properties of Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2 as Cathode Material for Li-ion Batteries

以LiOH·H2O,Ni2O3,Co3O4和MnO2为原料,经过机械活化后在空气气氛下经高温烧结,合成了锂离子电池正极材料Li[Li0.2Mn0.54Ni0.13Co0.13]O2.通过X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学性能测试对所得样品的结构、形貌及电化学性能进行了表征.结果表明,900℃下烧结10h后可获得晶粒细小均匀的层状Li[Li0.2Mn0.54Ni0.13Co0.13]O2材料,并具有良好的电化学性能,在室温下以60mA/g的电流充放电,首次放电比容量可达到248.2mAh/g,循环50次后放电比容量为239.4mAh/g,容量保持率为96.45%.测试了该材料的高低温循环性能.

Li[Li0.2Mn0.54Ni0.13Co0.13]O2 was synthesized from LiOH？H2O,Ni2O3,Co3O4 and MnO2 by improved solid state method.The raw materials were mixed with mechanical activation process,and then calcined at high temperature in air.The products were analyzed by X-ray diffractometry（XRD）,scaning electron microscopy（SEM） and electrochemical tests.The results showed that the sandwich Li[Li0.2Mn0.54Ni0.13-Co0.13]O2 material obtained at 900 ℃ for 10 h exhibited uniform and fine particle sizes.The initial discharge capacity of prepared Li[Li0.2Mn0.54Ni0.13Co0.13]O2 is 248.2 mAh/g at room temperature,and manitains 239.4 mAh/g after 50 cycles at a constant discharge current of 60 mA/g,indicating high electrochemical capacity and good cycling stability.Its cycle ability was also investigated at 55 and 0 ℃.