Abstract
The theoretical capacity of Li2MnO3 as cathodic material for Li-ion batteries is known to be among the highest because of the presence of Li in the transition metal layer, however it suffers of inactivity due to Mn in tetravalent oxidation state. Several compositions such as Li2MnO3, Li2Mn0.5Rh0.5O3 and Li2RhO3 were synthesized by conventional solid state synthesis. XRD patterns indicated the presence of monoclinic phase for pristine Li2MnO3 and Li2RhO3. The 50% rhodium substitution into Li2MnO3 seems to form a composite of both Li2MnO3 and Li2RhO3. XPS analysis for Mn 2p orbital revealed a significant decrease in binding energy for Li2Mn0.5Rh0.5O3 composition, which indicates the possible reduction in the oxidation state of manganese. Cyclic voltammetry and charge/discharge analysis were also performed. A discharge capacity of 49 mAh/g for Li2MnO3, 187 mAh/g for Li2Mn0.5Rh0.5O3 and 130 mAh/g for Li2RhO3 were obtained for the first cycle.
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