Journal
JOURNAL OF POWER SOURCES
Volume 109, Issue 2, Pages 427-430Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(02)00101-5
Keywords
sol-gel method; electrochemical characteristics; lithium secondary batteries; spinal; 5 V materials
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A series of electrochemical spinel compounds, LiCrxM0.5-xMn1.5O4 (x = 0, 0.1, 0.3), are synthesized by a sol-gel method and their electrochemical properties are characterized in the voltage range of 3.5-5.2 V. Electrochemical data for LiCrxNi0.5-xMn1.5O4 electrodes show two reversible plateaus at 4.9 and 4.7 V The 4.9 V plateau is related to the oxidation of chromium while the 4.7 V plateau is ascribed to the oxidation of nickel. The LiCr0.1Ni0.4Mn1.5O4 electrode delivers a high initial capacity of 152 mAh g(-1) with excellent cycleability. The excellent capacity retention of the LiCr0.1Ni0.4Mn1.5O4 electrode is largely attributed to structural stabilization which results from co-doping (chromium and nickel) and increased theoretical capacity due to substitution of chromium. (C) 2002 Elsevier Science B.V. All rights reserved.
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