Electrochemical and structural properties of carbon-coated LiFe0.2Mn0.8PO4 cathode

초록

Olivine-structured LiFePO4 is anticipated as a promising cathode material for lithium-ion batteries and lithium polymer batteries. In our research group, we synthesized homogeneous and fine particles of LiFePO4 and LiFe0.2Mn0.8PO4 using mechanical alloying (MA) to address the low electrical conductivity and lithium ion diffusion rate of LiFePO4. LiFe0.2Mn0.8PO4 exhibited similar structural characteristics to LiFePO4, yet it demonstrated superior electrochemical properties. It achieved a capacity of 159.4 mAh/g, an electrical conductivity of 4.9 x 10(-7) S/cm, excellent cycle and rate performance, and a lithium ion diffusion coefficient of 2.1 x 10(-14) cm(2) S-1. These findings highlight the effectiveness of mechanical alloying in enhancing the electrochemical performance of LiFePO4-based materials, paving the way for their application in advanced lithium-ion battery technologies.

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