Cathode materials LiFePO4 and LiFe0.9Mg0.1PO4 for lithium ion batteries were synthesized by a solid state reaction. Chemical oxidation to obtain Li0.4Fe0.9Mg0.1PO4 and Li0.1Fe0.9Mg0.1PO4 was carried out by reacting LiFe0.9Mg0.1PO4 with K2S2O8 solution of different concentration. Li0.1Fe0.9Mg0.1PO4 was confirmed to be a single phase compound with no impure phases,investigated by X-ray diffraction (XRD),selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM) techniques. Calculated lattice parameter results showed decreased lattice misfit between lithiated LiFe0.9Mg0.1PO4 and delithiated Li0.1Fe0.9Mg0.1PO4,compared lattice misfit between LiFePO4 and FePO4. It was considered the decreased lattice misfit as the structural basis for optimized high-rate capability of cathode material LiFe0.9Mg0.1PO4 for lithium ion batteries.


lithium ion battery, lithium iron phosphate, phase transformation, kinetic behavior, lattice misfit

Publication Date


Online Available Date


Revised Date


Received Date



[1]Wang De-yu,Li Hong,Shi Si-qi,et al.Improving the rate performance of LiFePO4by Fe-site doping[J].Electrochim Acta,2005,50:2955-2958.
[2]Delacourt C,Laffont L,Masquelier C,et al.Toward understanding of electrical limitations(electronic,ion-ic)in LiMPO4(M=Fe,Mn)electrode materials[J].J Electrochem Soc,2005,152(5):A913-A921.
[3]Huang H,Yin S,Nazar L.Approaching theoretical ca-pacity of LiFePO4at room temperature at high rates[J].Electrochem Solid State Lett,2001,4(10):A170-A172.
[4]Chung S,Bloking J,Chiang Y.Electronically conduc-tive phosphor-olivines as lithium storage electrodes[J].Nat Mater,2002,1:123-128.
[5]Herle P,Ellis B,Nazar L,et al.Nano-network elec-tronic conduction in iron and nickel olivine phosphates[J].Nat Mater,2004,3:147-152.
[6]Ouyang Chu-ying,Shi Si-qi,Chen Li-quan,et al.First-principles study of Li ion diffusion in LiFePO4[J].Phys Rev B,2004,69(10):104303-1-5.
[7]Wang Chun-sheng,Hong Jian.Ionic/electronic conduc-ting characteristics of LiFePO4cathode materials:the determining factors for high rate performance[J].Elec-trochem Solid State Lett,2007,10(3):A65-A69.
[8]Meethong N,Carter W,Chiang Y,et al.Size-depend-ent lithium miscibility gap in nanoscale Li1-xFePO4[J].Electrochem Solid State Lett,2007,10(5):A134-A138.
[9]Meethong N,Carter W,Chiang Y,et al.Strain accom-modation during phase transformations in olivine-based cathodes as a materials selection criterion for high-power rechargeable batteries[J].Adv Funct Mater,2007,17:1115-1123.
[10]Islam M,Driscoll D,Slater P,et al.Atomic-scale in-vestigation of defects,dopants,and lithium transport in the LiFePO4olivine-type battery material[J].Chem Mater,2005,17(20):5085-5092.
[11]Padhi A,Nanjundaswamy K,Goodenough J.Phospho-olivines as positive-electrode materials for rechargeablelithium batteries[J].J Electrochm Soc,1997,144(4):1188-1194.
[12]Yamada A,Koizumi H,Nishimura S,et al.Room-tem-perature miscibility gap in LixFePO4[J].Nat Mater,2006,5:357-360.
[13]WangDe-yu,WuXiao-dong,ChenLi-quan,etal.Cracking causing cyclic instability of cathode material[J].J Power Sources,2005,140:125-128.
[14]Hong Jian,Wang Chun-sheng,Kasavajjula Uday.Ki-netic behavior of LiFe0.9Mg0.1PO4cathode material for Li-ion batteries[J].J Power Sources,2006,162:1289-1296.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.