期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 156, 期 6, 页码 A401-A406出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3106121
关键词
carbon; differential scanning calorimetry; diffusion; electrical conductivity; electrochemical electrodes; electrochemical impedance spectroscopy; iron compounds; lithium compounds; secondary cells
The carbon-coated LiFePO4 Li-ion cathode material was studied for its electrochemical and thermal performance. This electrode exhibited a reversible capacity corresponding to more than 90% of the theoretical capacity when cycled between 2.5 and 4.0 V. The material also showed good capacity retention at high powers, implying that the carbon coating improves the electronic conductivity and hence the cycling of this material. The diffusion coefficient of this material was calculated from its electrochemical impedance spectroscopy. The heat generation during charge and discharge was studied using an isothermal microcalorimeter. Thermal studies were also investigated by using a differential scanning calorimeter and an accelerating rate calorimeter, which showed that LiFePO4 is safer than the commonly used lithium metal oxide cathodes with layered structures.
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