复合金属掺杂的LiFePO4/C复合材料的制备与电化学性能研究

稀有金属材料与工程, 2014, 43(1): 172-177.

复合金属掺杂的LiFePO4/C复合材料的制备与电化学性能研究

张佳峰 ^1, , 王健龙 ^2, , 陈核章 ^3, , 张宝 ^4, , 郭学益 ^5, , 郑俊超 ^6, , 沈超 ^7,

1.中南大学,湖南长沙410083

2.中南大学,湖南长沙410083

3.中南大学,湖南长沙410083

4.中南大学,湖南长沙410083

5.中南大学,湖南长沙410083

6.中南大学,湖南长沙410083

7.中南大学,湖南长沙410083

基金项目: 国家自然科学基金(51072233)

关键词：超声波辅助沉淀 , 纳米球形FePO4·2H2O , 复合金属掺杂 , LiFePO4/C

Preparation and Characterization of LiFePO4/C Composite Doped with Various Meta

Zhang Jiafeng ^1, , Wang Jianlong ^2, , Chen Hezhang ^3, , Zhang Bao ^4, , Guo Xueyi ^5, , Zheng Junchao ^6, , Shen Chao ^7,

1.中南大学,湖南长沙410083

2.中南大学,湖南长沙410083

3.中南大学,湖南长沙410083

4.中南大学,湖南长沙410083

5.中南大学,湖南长沙410083

6.中南大学,湖南长沙410083

7.中南大学,湖南长沙410083

Keywords： ultrasonic-aided precipitation , nanosized spherical FePO4·2H2O , composite metal doping , LiFePO4/C

以超声波辅助沉淀法合成的纳米级球形FePO4·2H2O为原料,采用碳热还原法制备了复合金属掺杂的LiFePO4/C复合材料.通过X射线衍射(XRD),扫描电镜(SEM),恒电流充放电测试,循环伏安和交流阻抗测试表征了FePO4·2H2O和LiFePO4/C的物相、结构和电化学性能.结果表明,溶液浓度为0.1 mol/L时制备的FePO4·2H2O为分布均匀的纳米级球形颗粒.复合金属掺杂显著提高了LiFePO4的放电比容量,Ni和Nb复合掺杂的LiFePO4/C复合材料表现出了最佳的电化学性能,0.1C倍率条件下首次放电容量158.8 mAh/g,1C倍率下首次放电容量150.2 mAh/g,100次循环后容量保持率分别为98.30％和97.8％.Ni和Nb复合掺杂后提高了LiFePO4的锂离子扩散速率和电导率.

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