摘要
通过Mg+金属掺杂及流变相制备方法来改善橄榄石结构的LiFePO4的电化学性能.研究了不同掺杂量和不同制备方法对材料结构性能和电化学性能的影响.SEM,XRD,以及电化学测试结果表明,Mg掺杂可以较大程度提高材料电化学性能;0.1 C倍率下首次充电容量达到140.7 mAh/g.利用流变相法制备的材料粒度更小,其电化学性能得到进一步提高,0.1 C时放电比容量达到了147.5 mAh/g.
Mg-doped and the theological phase method are applied to improve the electrochemical performances of LiFePO4. The effect of different doping content and different preparation method on the properties of LiFePO4 are studied. The effect of temperature and content of Mg doping on the structure and chemical performance of LiFePO4 are researched. The results of SEM, XRD and electrochemical performances indicate that Mg doping can improve the electrochemical performance obviously, the discharge capacity of LiFe1-xMgxPO4 with 5% Mg doping is 140.7 mAh/g in 0.1 C. The electrochemical performance can improve more if the LiFe1 -x MgxPO4 material is prepared by rheologieal phase method, with the discharge capacity reaching 147.5 mAh/g at 0.1 C. Key words： rheologieal phase method; Mg-doping; Lithium-ion battery; cathode material
出处
《上海电力学院学报》
CAS
2010年第1期49-52,共4页
Journal of Shanghai University of Electric Power
基金
上海市自然科学基金(07ZR14042)
上海市教委优秀青年教师资助项目(B01672)
关键词
流变相法
Mg掺杂
锂离子电池
正极材料
rheological phase method
Mg-doping
Lithium-ion battery
cathode material
