Effect of Na+ and K+ co-doping on the structure and electrochemical behaviors of LiFePO4/C cathode material for lithium-ion batteries

Lithium iron phosphate (LiFePO₄) composites co-doped with Na⁺ and K⁺, Li_1−x−yNa_xK_yFePO₄/C (0 ≤ x ≤ 0.03, 0 ≤ y ≤ 0.03, x + y = 0.03), are synthesized through a sol–gel method and tested as a promising cathode material for lithium-ion batteries (LIBs).