Study on the electrochemical performance of Ti4+ doped enhanced LiFePO4 cathode material

This study aims to enhance the electrochemical performance of lithium iron phosphate (LiFePO ₄ ) cathode materials through Ti ⁴⁺ ion doping strategy, in order to address the challenges of low conductivity and slow lithium ion diffusion rate. We synthesized iron phosphate precursors with different Ti ⁴⁺ doping levels using chemical precipitation method, and successfully prepared LiFePO ₄ material by high-temperature solid-phase method. By systematically studying the effect of Ti ⁴⁺ doping on material structure, morphology, and electrochemical properties, we found that the discharge specific capacities of 2% Ti ⁴⁺ doped LiFePO ₄ samples at 0.1, 1, 5, and 10 C reached 161.0, 132.4, 105.3, and 92.6 mAh g ^-1 , respectively, demonstrating excellent electrochemical performance. Its lithium ion diffusion coefficient was also significantly better than other samples. The comprehensive analysis results of XRD, SEM, XPS, and electrochemical testing show that the appropriate amount of Ti ⁴⁺ doping optimizes the diffusion path of lithium ions and increases the charge transfer rate, thereby significantly improving the electrochemical performance of LiFePO ₄ . This discovery not only enriches the understanding of the modification mechanism of lithium-ion battery cathode materials, but also provides important scientific basis and practical guidance for the development of high-performance lithium-ion battery cathode materials.