Electrochemical Properties and Thermal Stability of LiNi0.8Co0.15 Al0.05O2-LiFePO4 Mixed Cathode Materials for Lithium Secondary Batteries

Kim, Hyun-Ju; Jin, Bong-Soo; Doh, Chil-Hoon; Kim, Hyun-Soo

doi:2012.3.2.63

J. Electrochem. Sci. Technol > Volume 3(2); 2012 > Article

Article

Journal of Electrochemical Science and Technology 2012;3(2):63-67.
DOI: https://doi.org/10.5229/JECST.2012.3.2.63

Electrochemical Properties and Thermal Stability of LiNi_0.8Co_0.15 Al_0.05O₂-LiFePO₄ Mixed Cathode Materials for Lithium Secondary Batteries

Hyun-Ju Kim, Bong-Soo Jin, Chil-Hoon Doh, Hyun-Soo Kim

Battery Research Center, Korea Electrotechnology Research Institute;Battery Research Center, Korea Electrotechnology Research Institute;Battery Research Center, Korea Electrotechnology Research Institute;Battery Research Center, Korea Electrotechnology Research Institute;

Abstract

We prepared various $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2-LiFePO_4$ mixed-cathode electrodes by changing the content of $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$ and $LiFePO_4$ used, and we analyzed the electrochemical characteristics of the cathodes. We found that the reversible specific capacity of the cathodes increased and that the capacity retention ratios of the cathodes decreased during cycling as the content of $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$ increased. Conversely, we found that although the reversible specific capacity of the cathodes decreased because of the material composition, the cycle property of the cathodes increased when the $LiFePO_4$ content increased. We analyzed the thermal stability of the $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2-LiFePO_4$ mixed-material cathodes by differential scanning calorimetry and found that it increased as the $LiFePO_4$ content increased.

Keywords: $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$, $LiFePO_4$, Thermal stability, Mixed-cathode, Cycle property