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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 11
BKCSDE 32(11)
November 20, 2011 

 
Title
The Sintering Temperature Effect on Electrochemical Properties of LiMn2O4
Author
Jin Tae Hwang, Sung Bin Park, Chang Kyoo Park, Ho Jang *
Keywords
LiMn2O4, Manganese dissolution, Capacity fading, Sintering, Particle size
Abstract
The effect of sintering temperature on the electrochemical property of LiMn2O4 was investigated. Results showed that the particle size was increased at higher sintering temperatures while the initial capacity was decreased after high temperature sintering. Capacity fading, on the other hand, was suppressed at lower sintering temperatures since the sintering at higher temperatures (≥ 800 oC) increased the Mn ions with a lower oxidation state (Mn+3), which induced structural instability during cycling due to dissolution of Mn ions into the electrolyte. In particular, LiMn2O4 sintered above 830 oC showed severe capacity fading (capacity loss was 38% of initial capacity) by lower coulombic efficiency due to the abnormally increased particle size.
Page
3952 - 3958
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