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.
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)
出处
《四川有色金属》
2018年第3期58-61,共4页
Sichuan Nonferrous Metals
