Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Properties and Thermal Stability of LiNi0.8Co0.15 Al0.05O2-LiFePO4 Mixed Cathode Materials for Lithium Secondary Batteries

  • Kim, Hyun-Ju (Battery Research Center, Korea Electrotechnology Research Institute) ;
  • Jin, Bong-Soo (Battery Research Center, Korea Electrotechnology Research Institute) ;
  • Doh, Chil-Hoon (Battery Research Center, Korea Electrotechnology Research Institute) ;
  • Kim, Hyun-Soo (Battery Research Center, Korea Electrotechnology Research Institute)
  • Received : 2012.05.08
  • Accepted : 2012.06.22
  • Published : 2012.06.30
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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.

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