Optimized solid-state synthesis of LiFePO sub(4 cathode materials using ball-milling)

Olivine-type LiFePO sub(4 cathode materials were synthesized by a solid-state reaction method and ball-milling. The ball-milling time, heating time and heating temperature are optimized. A heating temperature higher than 700 [deg]C resulted in the appearance of impurity phase Fe) sub(2)P and growth...

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Bibliographic Details
Published in:Journal of power sources 2008-04, Vol.179 (1), p.340-346
Main Authors: Kang, Hee-Cheol, Jun, Dae-Kyoo, Jin, Bo, Jin, En Mei, Park, Kyung-Hee, Gu, Hal-Bon, Kim, Ki-Won
Format: Article
Language:English
Subjects:
Cathodes
Cycles
Discharge
Heat treatment
Heating
Impurities
Milling (machining)
Synthesis
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Summary:Olivine-type LiFePO sub(4 cathode materials were synthesized by a solid-state reaction method and ball-milling. The ball-milling time, heating time and heating temperature are optimized. A heating temperature higher than 700 [deg]C resulted in the appearance of impurity phase Fe) sub(2)P and growth of large particle, which was shown by high resolution X-ray diffraction and field emission scanning electron microscopy. The impurity phase Fe sub(2P exhibited a considerable capacity loss at the 1st cycle and a gradual increase in discharge capacity upon cycling. Moreover, it exhibited an excellent high-rate capacity of 104 mAh g[super]-1 at 3 C in spite of the large particle size. The optimum synthesis conditions for LiFePO) sub(4) were ball-milling for 24 h and heat-treatment at 600 [deg]C for 3 h. LiFePO sub(4/Li cells showed an enhanced cycling performance and a high discharge capacity of 160 mAh g[super]-1 at 0.1 C.)
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2007.12.093