Cathode and lithium battery using same

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A positive electrode having a surface on which a positive electrode active material composition including a positive electrode active material is formed. The positive electrode includes a first lithium compound having an open-circuit voltage less than 3V with respect to lithium metal, and a second lithium compound having an open-circuit voltage of 3 V or greater with respect to lithium metal. The first lithium compound includes a solid solution represented by Formula 1 : xLizM1-yM′yO2-(1−x)LiaM″bMocO3.