摘要
采用熔盐-碳热还原法制备了LiFePO4正极材料。采用X射线衍射(XRD)、扫描电镜(SEM)、交流阻抗(EIS)和充放电测试对粉末样品进行了表征。结果表明,合成材料具有完整的橄榄石结构,颗粒粒径约1μm且粒度分布均匀,材料0.2 C首次放电比容量为156.4 mAh/g,1 C首次放电比容量为141.2 mAh/g,循环50次后1 C比容量增至141.7mAh/g,表现出优异的电化学性能。
The LiFePO4 cathode materials was synthesized by molten salt-carbothermal reduction method.The prepared powders were characterized by X ray diffraction（XRD）,scanning electron microscopy（SEM）,electrochemical impedance spectroscopy（EIS） and charge-discharge tests.The results show that the prepared samples have ordered olivine structure and fine particles with an average particle size about 1 μm.The initial discharge specific capacity of LiFePO4is 156.4 mAh/g at 0.2 C rate,141.2 mAh/g is obtained at 1 C rate and the specific capacity rises to 141.7 mAh/g after 50 cycles.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第7期1123-1125,共3页
Chinese Journal of Power Sources
关键词
正极材料
LIFEPO4
熔盐-碳热还原法
电化学性能
cathode material
LiFePO4
molten salt-carbothermal reduction method
electrochemical performance
