Synthesis and Characterization of Li[Li0.27Cr0.15Al0.05Mn0.53]O2 Cathode for Lithium-Ion Batteries.

Authors :: Mangani, I. Ruth
Park, C. W.
Yoon, Y. K.
Beom, J. H.
Kima, J.
Source :: Journal of The Electrochemical Society; Apr2007, Vol. 154 Issue 4, pA359-A363, 5p, 10 Graphs
Publication Year :: 2007
Abstract: The effect of doping aluminum in the Li[Li<subscript>0.27</subscript>Cr<subscript>0.15</subscript>Al<subscript>0.05</subscript>Mn<subscript>0.53</subscript>]O<subscript>2</subscript> layered cathode material has been investigated. The citric acid assisted sot-gel process was used to prepare the cathode material. The electrochemical properties of the cathode material were characterized in coin cells assembled in an argon-filled dry glove box. The Al-doped cathode delivered an initial discharge capacity of 198 mAh/g with a current density of 0.12 mA/cm<subscript>2</subscript>. A slight change in the shape of the discharge curve was observed with the substitution of aluminum in Li<subscript>1.27</subscript>Cr<subscript>0.2</subscript>Mn<subscript>0.53</subscript>O<subscript>2</subscript> cathode material. A decreased resistance was observed in the aluminum- doped cathode from the ac impedance spectroscopy. Regarding the state of existence of chromium and manganese ions in the transition metal layer, X-ray photoelectron spectroscopy study results indicated that Mn<superscript>4+</superscript> was reduced to Mn<superscript>3+</superscript> at the end of the discharge. [ABSTRACT FROM AUTHOR]

Subjects :: ELECTROCHEMICAL analysis
IMPEDANCE spectroscopy
INTERMEDIATES (Chemistry)
SOLUTION (Chemistry)
PROPERTIES of matter
TRANSITION metals
PHOTOELECTRON spectroscopy
MOLECULAR orbitals
LITHIUM-ion batteries

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