高性能正极材料LiFePO_4的制备及表征  

Synthesis and Characterized of High Performance LiFePO_4 Cathode Material

作　　者：李海英 岳波 黄小丽 王俊安 李延俊 LI Haiying;YUE Bo;HUANG Xiaoli;WANG Junan;LI Yanjun(Sichuan Energy Industry Investment Group Co.,Ltd,Chengdu 610063,China;Sichuan Keneng LithiumBattery Co.,Ltd,Chengdu 610063,China)

机构地区：[1]四川省能源投资集团有限责任公司,四川成都610063 [2]四川科能锂电有限公司,四川成都610063

出　　处：《四川有色金属》2018年第3期58-61,共4页Sichuan Nonferrous Metals

摘　　要：采用颗粒纳米化技术与雾化干燥相结合的方法合成了高性能的LiFe_(0.98)Ti_(0.02)PO_(4-x)F_x/C(x=0.00,0.02)正极材料。利用X-ray粉末衍射仪、场发射扫描电子显微镜和蓝电测试系统对合成材料的晶体结构、颗粒形貌和电化学性能进行了表征。结果表明,采用该方法可明显降低一次颗粒粒径,同时引入Ti-F掺杂可进一步提高产品的电化学性能。LiFe_(0.98)Ti_(0.02)PO_(3.98)F_(0.02)/C表现出最好的电化学性能,其0.1C首次放电比容量和库伦效率分别为163.9mAh/g和97.3%;1C放电比容量为144.3mAh/g,循环50次后容量保持率为98.8%,表现出了较高放电比容量和良好的循环性能。LiFe0.98Ti0 .02PO4-xFx/C （x=0.00,0.02） cathode materials were synthesized by this method which combinednanoparticle technology with a spray drying method. X-ray diffraction （XRD）, scanning electron microscopy （SEM）and electrochemical tests were used to characterize the structure, appearance and electrochemical performance ofas-prepared samples. The results showed that the sample prepared by this method had small particle size. At thesame time, Ti-F doping can also improve the electrochemical performance. The electrochemical tests show thatLiFe0 .98Ti0.02PO3.98F0.02/C has excellent electrochemical performance. The LiFe0.98Ti0.02PO3.98F0.02 /C has an initialdischarge specific capacity of 163.9mAh/g at 0.1C, and initial charge -discharge efficiency of 97.3% . TheLiFe0 .98Ti0.02PO3.98F0.02/C discharge capacity of 144.3mAh/g at 1C, and keep 98.8% after 50 cycling number.Compared with LiFe0.98Ti0.02PO4/C samples, LiFe0.98Ti0.02PO3 .98F0.02/C has a higher capacity, more stable cyclingperformance.

关 键 词：锂离子电池 磷酸铁锂 LiFe0.98Ti0.02PO4-xFx/C 碳热还原法 

分 类 号：TM912[电气工程—电力电子与电力传动]