熔融盐法合成高密度锂离子电池正极材料LiNi0．8CO0．15Ti0．05O2

Preparation of high density LiNi_(0.8)Co_(0.15)Ti_(0.05)O_2 as cathode material for lithium ion battery by a molten salt method

利用低共熔组成的0．38LiOH-0．62LiNO3混合锂盐体系，与高密度前驱体掺杂Co的Ni（OH）2、TiO2粉末在低温下自混合，无需前期研磨和后续洗涤，直接制备出振实密度达3．17g／cm^3的高密度锂离子电池正极材料LiNi0．8Co0．15Ti0.05O2。X射线衍射分析表明合成的LiNi0.8Co0.05Ti0.05O2具有规整的层状α-NaFeO2结构。扫描电镜显示产物颗粒均匀，电性能测试表明，在0．2C放电倍率和3．0～4．3V的电压范围内，LiNi0．8Co0．15Ti0.05O2良好首次放电比容量达169mAh／g，且具有良好的循环性能。

Co-Ti co-doped cathode material LiNi0.8Co0.15 Ti0.05 O2 was synthesized directly without artificial grinding and washing by a eutectie molten-salt mixture （0.38LiOH-0.62LiNO3） method. According to this method, the eutectic molten-salt mixture was self-mixed with high tap density precursor Co added Ni（OH）2 and TiO2 thoroughly at low temperature and then sintered at a certain temperature. The tap-density of LiNi0.8Co0.15Ti0.05O3 obtained 3. 17g/cm^3. According to X-ray diffraction analysis （XRD） and scanning electron microscopy （SEM）, these materials LiNi0.8 Co0.2-xTixO2 have an order α-NaFeO2 layer structure and regular morphology. Charge-discharge tests show that LiNi0.8Co0.15 Ti0.05O2 has an initial discharge capacity as high as 169mAh/g and excellent capacity retention in the range 4.3-3.0V at a specific current of 0.2C.