Electrochemical and structural properties of carboncoated LiFe0.2Mn0.8PO4 cathode
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Olivine-structured LiFePO4 is anticipated as a promising cathode material for lithium-ion batteries and lithium polymerbatteries. In our research group, we synthesized homogeneous and fine particles of LiFePO4 and LiFe0.2Mn0.8PO4 usingmechanical alloying (MA) to address the low electrical conductivity and lithium ion diffusion rate of LiFePO4. LiFe0.2Mn0.8PO4exhibited similar structural characteristics to LiFePO4, yet it demonstrated superior electrochemical properties. It achieveda capacity of 159.4 mAh/g, an electrical conductivity of 4.9 × 10-7 S/cm, excellent cycle and rate performance, and a lithiumion diffusion coefficient of 2.1 × 10-14 cm2 S-1. These findings highlight the effectiveness of mechanical alloying in enhancingthe electrochemical performance of LiFePO4-based materials, paving the way for their application in advanced lithium-ionbattery technologies.
Abstract
Olivine-structured LiFePO4 is anticipated as a promising cathode material for lithium-ion batteries and lithium polymerbatteries. In our research group, we synthesized homogeneous and fine particles of LiFePO4 and LiFe0.2Mn0.8PO4 usingmechanical alloying (MA) to address the low electrical conductivity and lithium ion diffusion rate of LiFePO4. LiFe0.2Mn0.8PO4exhibited similar structural characteristics to LiFePO4, yet it demonstrated superior electrochemical properties. It achieveda capacity of 159.4 mAh/g, an electrical conductivity of 4.9 × 10-7 S/cm, excellent cycle and rate performance, and a lithiumion diffusion coefficient of 2.1 × 10-14 cm2 S-1. These findings highlight the effectiveness of mechanical alloying in enhancingthe electrochemical performance of LiFePO4-based materials, paving the way for their application in advanced lithium-ionbattery technologies.
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