Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 16, Pages 6992-6996Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.10.051
Keywords
Olivine; Solid solution; Mesoporous; Overpotential; Cathode; Lithium ion batteries
Funding
- 973 project [2007CB936501]
- Nature Scientific Foundation of China [50730005]
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A series of LiFe1-xMnxPO4/C materials with high Mn content (0.7 <= x <= 0.9) are synthesized by solid state reaction. The samples have mesoporous structure with an average pore size of 25 nm, particle size around 200-300 nm, crystalline size around 30 nm and specific areas around 50 m(2) g(-1). Their electrochemical performances are studied and the reversible capacity and rate performance decrease with the increase of Mn content. The redox potential of the Fe2+/Fe3+ and Mn2+/Mn3+ redox couple also shift accordingly. The overpotential value of the Mn2+/Mn3+ redox couple (80 mV) is close to that of the Fe2+/Fe3+ couple (60 mV) in all three compositions and shows a maximum (similar to 300 mV) in the regions of voltage transition. (C) 2010 Elsevier B.V. All rights reserved.
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