PAA络合法制备LiFePO_4粉体及其电化学性能研究  

Preparation and Electrochemical Properties of LiFePO_4 Powder Prepared by PAA Complexometry Method

作　　者：吴朝阳[1] 赵胜利[1] 孙为[1] 

机构地区：[1]河南科技大学材料学院,河南洛阳471003

出　　处：《热加工工艺》2013年第20期134-135,138,共3页Hot Working Technology

基　　金：河南科技大学人才科研基金项目(04015);河南省教育厅自然科学计划项目(2006430005)

摘　　要：采用络合法并结合热处理工艺制备LiFePO4粉体,考察了热处理温度对LiFePO4粉体结构、形貌及电化学性能的影响。结果表明:以聚丙烯酸(PAA)、硝酸铁、硝酸锂和磷酸二氢铵为原料,在一定温度下合成了稳定溶胶和凝胶;在不同温度下煅烧得到了LiFePO4粉体。随着煅烧温度升高,粉体颗粒逐渐增大,晶型趋于完整。650℃下煅烧获得的LiFePO4颗粒大小均匀,晶型完整且没有团聚现象,0.1C倍率首次放电比容量达165 mAh/g,表现出良好的充放电稳定性。LiFePO4 was synthesized by complexometry and heating treatment process. The influences of sintering temperature on the microstructure, morphology and electrochemical performance were explored by XRD, SEM and galvanostatic charge-discharge. The results show that the stable sol and gel are prepared by PAA, FeNO3, LiNO3 and NH4H2PO4 in water solution, the LiFePO4 is sintered at different temperatures. With the increase of calcination temperature, LiFePO4 particle becomes larger and the crystal structure is more integrity. The LiFePO4 power prepared by heating treatment gel at 650 ℃ exhibits uniform distribution, high crystallinity, low agglomeration and high electrochemistry performance. The first discharge capacity reaches 165 mAh/g under the rate of 0.1 C, which can prove that LiFePO, has stable cycle performance.

关 键 词：LIFEPO4 结构 PAA 电化学性能 

分 类 号：TB383[一般工业技术—材料科学与工程]