Sol-gel synthesis and electrochemical characterization of Mg-/Zr-doped LiCoO2 cathodes for Li-ion batteries

► Composite cathodes made of Zr-doped LiCoO2 with the addition of inactive Mg and Zr oxides. ► Mg and Zr oxides inhibit the aggregation of the active material particles. ► Dopant Zr enhances electronic conductivity and structural stability of the cathode. ► Mg and Zr oxides increase high-voltage stability of electrode-electrolyte interface.