Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effect of substituent and dopant on properties of $LiMn_2O_4$ as cathode materials for lithium ion secondary batteries

  • Lee, Dae-Jin (Electronic Materials Lab., Korea Institute of Ceramic Engineering & Technology) ;
  • Wai, Yin-Loo (Electronic Materials Lab., Korea Institute of Ceramic Engineering & Technology) ;
  • Jee, Mi-Jung (Electronic Materials Lab., Korea Institute of Ceramic Engineering & Technology) ;
  • Bae, Hyun (Sinceramic Co. LTD.) ;
  • Choi, Byung-Hyun (Electronic Materials Lab., Korea Institute of Ceramic Engineering & Technology)
  • Published : 2007.11.01
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Abstract

Spinel cathode material $LiMn_2O_4$ is currently studied as a promising cathode material for lithium ion secondary batteries for future applications because of it is low cost, easy to be prepared and capable to be operated in high voltage range. However as a cathode material, $LiMn_2O_4$ performs a poor capacity retention which leads to short cycle life. In this study, stoichiometric $LiMn_2O_4$ was synthesized with granulation method with ion substitution to stabilize its structure and niobium doping to improve its conductivity. These well-mixed powders were calcined at $850^{\circ}C$ for 6 hours and its properties were investigated. Correlations of dopant and electrochemical properties were examined as well.

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