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http://dx.doi.org/10.5229/JKES.2003.6.4.229

Synthesis of Lithium Manganese Oxide by a Sol-Gel Method and Its Electrochemical Behaviors  

Jeong, Euh-Duck (Busan Branch, Korea Basic Science Institute)
Moon, Sung-Wook (Department of Chemistry, Pusan National University)
Lee, Hak-Myoung (Department of Chemistry, Pusan National University)
Won, Mi-Sook (Busan Branch, Korea Basic Science Institute)
Yoon, Jang-Hee (Busan Branch, Korea Basic Science Institute)
Park, Deog-Su (Department of Chemistry, Pusan National University)
Shim, Yoon-Bo (Department of Chemistry, Pusan National University)
Publication Information
Journal of the Korean Electrochemical Society / v.6, no.4, 2003 , pp. 229-235 More about this Journal
Abstract
A precursor of lithium manganese oxide was synthesized by mixing $(CH_3)_2CHOLi\;with\;Mn(CH_3COO)_2{\cdot}4H_2O$ in ethanol using a sol-gel method, then heat-treated at $400^{\circ}C\;and\;800^{\circ}C$ in air atmosphere. The condition of heat treatment was determined by thermogravimetric analysis/differential thermogravimetric analysis (TGA/DTA). The characterization of the lithium manganese oxide was done by X-ray diffraction (XRD) spectra and scanning electron microscopy (SEM). The electrochemical characteristics of lithium manganese oxide electrode for lithium ion battery were measured by cyclic voltammetry (CV), chronoamperometry and AC impedance method using constant charge/discharge process. The electrochemical behaviors of the electrode have been investigated in a 1.0M $LiClO_4/propylene$ carbonate electrolyte solution. The diffusivity of lithium ions, $D^+\;_{Li}\;^+$, as determined by AC impedance technique was $6.2\times10^{-10}cm^2s^{-1}$.
Keywords
Sol-gel; Lithium manganese oxide; Impedance spectroscopy; Charge/Discharge capacity;
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