Relative Impact of Al or Mg Substitution on the Thermal Stability of LiCo[sub 1−z]M[sub z]O[sub 2] (M=Al or Mg) by Accelerating Rate Calorimetry

Al- or Mg-substituted ( or Mg) samples were synthesized by a coprecipitation-based method followed by heating with at for and again at for . Electrochemical studies showed that Al or Mg substitution reduces the initial discharge capacity of cells but does not strongly impact their cycle life. The effects of Al or Mg substitution on the thermal stability of charged were studied by accelerating rate calorimetry and indicate that Al substitution is far more effective than Mg substitution in improving the thermal stability of .