Cr3+对LiFePO4/C材料结构和电化学性能的影响

材料导报, 2014, 28(16): 44-46. doi: 10.11896/j.issn.1005-023X.2014.16.011

Cr3+对LiFePO4/C材料结构和电化学性能的影响

章兴石 ^1, , 唐仁衡 ^2, , 肖方明 ^3, , 王英 ^4, , 肖志平 ^5,

1.广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州510650;华南理工大学材料科学与工程学院,广州510640

2.广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州,510650

3.广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州,510650

4.广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州,510650

5.广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州,510650

基金项目: 珠海市产学研合作专项资金(2011A05010003) 珠海市战略性新兴产业重大项目

关键词：磷酸铁锂 , Cr掺杂 , 锂离子电池 , 电化学性能

Effects of Cr Doping on Structure and Electrochemical Performance of LiFePO4/C

Keywords： LiFePO4 , Cr doping , lithium battery , electrochemical performance

采用二步固相反应法合成了具有橄榄石结构的LiFe0.98Cr0.02PO4/C复合正极材料,并通过XRD、SEM、恒流充放电、循环伏安等分析测试手段对材料的物相结构及电化学性能进行表征.结果表明:LiFePO4材料引入Cr3+未改变其原有的晶体结构,但合成材料的颗粒尺寸明显减小,颗粒粒径约为200 nm;获得的LiFe0.98Cr0.02-PO4/C复合材料具有良好的电化学性能,0.2C倍率下首次放电比容量为144.9mAh·g-1,50次循环后,容量保持率为99.6％,10C倍率放电比容量可达到116.3 mAh·g-1.循环伏安性能测试表明Cr3+的掺杂提高了Li+在材料中脱嵌过程的可逆性.

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