ABSTRACT Lithium‐ion (Li‐ion) batteries are one of the most widely used energy storage technologies, particularly in portable electronic devices and electric vehicles. The advantages are high energy density, long service life, and fast charging capability. In Li‐ion battery systems, the cathode material plays a crucial role in determining the overall performance of the battery. One promising cathode material is lithium iron phosphate (LiFePO 4 ) due to its relatively high specific capacity (170 mAh/g), environmental friendliness, good safety and thermal stability, and low production costs. However, LiFePO 4 has low electronic conductivity and slow lithium ion diffusion rates. Both issues can be addressed through doping with metal ions. This study focuses on modifying the structure of LiFePO 4 through doping with transition metal ions (Ni 2 + and Co 2 + ) at the iron (Fe 2 + ) sites, resulting in samples of LiFe 1‐x M x PO 4 . Electrochemical characterization results, including EIS, CV, and CD, indicate that doping with transition metal ions (Ni 2 + and Co 2 + ) at a concentration of 2% at the Fe 2 + sites of the olivine LiFePO 4 structure effectively enhance electrochemical performance by reducing the charge transfer resistance (Rct), and the reduction oxidation peak voltage (ΔV), increasing the Li ion (D + ) diffusion coefficient, and the specific capacity of the Li‐ion battery.
Santika et al. (Fri,) studied this question.