カーボン被覆したLiFePO₄への金ナノ粒子の超音波合成およびその電池特性

抄録

LiFePO₄ has attracted attention as a promising cathode material for lithium ion battery, because it consists of abundant elements. However, the battery performance of this material is limited by its low electron conductivity and low lithium ion diffusion rate. Coating its surface with an electronically conductive material, such as carbon, is one of the major methods to overcome this issue. In this study, we tried to synthesize Au nanoparticles (NPs) on the surface of carbon-coated LiFePO₄ (LiFePO₄/C) using sonochemical reaction to further enhance the electron conductivity. The size of Au NPs deposited on the surface of LiFePO₄/C changed in relation to the concentration of Au ions. The battery performance of the Au NPs-deposited LiFePO₄/C, as evaluated at a high constant current rate of 20 C, showed an improvement in the polarization and discharge capacity of LiFePO₄/C.