两种碳源对橄榄石型正极材料LiFePO4性能的影响

中国材料进展, 2009, 28(7): 82-85.

两种碳源对橄榄石型正极材料LiFePO4性能的影响

夏继才 ^1, , 王殿龙 ^2, , 杨春巍 ^3, , 刘建生 ^4,

1.广州天赐高新材料股份有限公司,广东,广州,510760;哈尔滨工业大学,黑龙江,哈尔滨,150001

2.哈尔滨工业大学,黑龙江,哈尔滨,150001

3.广州天赐高新材料股份有限公司,广东,广州,510760

4.广州天赐高新材料股份有限公司,广东,广州,510760

基金项目: 广州黄埔区科技攻关项目(0915)

关键词：锂离子电池 , LiFePO4/C , 正极材料 , 两种碳源 , 掺杂

Effects of Different Carbon Sources on the Performance of Olivine LiFePO4/C Cathode Material

采用固相反应法在惰性气体气氛下合成了橄榄石型LiFePO4及LiFePO4/C复合正极材料,采用XRD,SEM以及电化学测试等手段对材料进行了结构表征和性能测试.考察了蔗糖、石墨两种碳源对材料性能的影响.XRD结果表明,两种碳源的添加对LiFePO4的晶体结构没有明显的影响;SEM表明,掺杂后,样品的粒径变小;充放电测试表明,和未掺杂的LiFePO4相比掺杂石墨和掺杂蔗糖的LiFePO4具有更好的电化学性能,放电比容量分别为:138.85mAh·g-1和126.2mAh·g-1,高于纯的LiFePO4正极材料的容量90mAh·g-1.经100次循环后,掺杂蔗糖、掺杂石墨及未掺杂的LiFePO4样品的容量衰减率分别为0.02%,1.2%和47%.

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