Solid-state synthesis of LiCoO2/LiCo0.99Ti0.01O2 composite as cathode material for lithium ion batteries

► We have fabricated a micron-sized LiCoO2/LiCo0.99Ti0.01O2 composite by solid-phase synthesis. ► XPS measurement and SEM observation reveal a Ti concentration gradient in the composite. ► The obtained LiCoO2/LiCo0.99Ti0.01O2 composite presents greatly enhanced cycling stability as well as rate capability. ► DSC further indicates that the LiCoO2/LiCo0.99Ti0.01O2 composite has a better thermal stability than the bare LiCoO2.