High-Power Charge/Discharge Properties of LiFePO4/Carbon Composites with Various Carbon Materials

Akira Kuwahara; Shinya Suzuki; Masaru Miyayama

doi:10.4028/www.scientific.net/KEM.388.45

Paper Titles

Synthesis of Well-Aligned ZnO Nanowhisker Films Using Aqueous Solution for Use in Dye-Sensitized Sensor
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High-Rate Charge-Discharge Performance of Composite Electrodes of FeOOH-Based Amorphous Particles and Carbon Powder
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Fabrication of Titanate Thin Film by Electrophoretic Deposition of Tetratitanate Nanosheets for Electrodes of Li-Ion Battery
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Effects of Lattice Defects on Cathode Properties of LiMn₂O₄Synthesized at Low Temperatures for Lithium Ion Secondary Battery
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High-Power Charge/Discharge Properties of LiFePO₄/Carbon Composites with Various Carbon Materials
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Electrode Properties of Ba_0.5Sr_0.5Co_yFe_1-yO_3-δCathode Materials for Solid Oxide Fuel Cell
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Synthesis and Lithium Ion Conductivity of MP₂O₇-Based Solid Electrolytes
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Shell-Core Type Proton Conducting TiP₂O₇-Based Solid Electrolytes
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Classical Molecular Dynamics Simulations on Fast Li Ion Conduction in (Li,La)TiO₃
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High-Power Charge/Discharge Properties of LiFePO₄/Carbon Composites with Various Carbon Materials

Abstract:

Electrochemical properties of LiFePO4/carbon composites with various carbon materials were investigated to achieve high-rate charge and discharge properties. LiFePO4/carbon composites were synthesized by a pyrolysis of a LiFePO4 precursor solution added with porous graphite or particulate carbon powders. The LiFePO4/porous-graphite composite had a microstructure in which LiFePO4 particles existed on carbon surface and within pores. The LiFePO4/particulate-carbon composite had a microstructure in which each carbon particle was covered with LiFePO4 fine particles. The LiFePO4/porous-graphite and the LiFePO4/particulate-carbon composite electrodes showed high discharge capacities of 69 and 30 mAh g-1 at a high current density of 4000 mA g-1. The high electronic conductivity in the LiFePO4/porous-graphite composite contributed to achieving the large discharge capacity at the high current density.