Synthesis, Electrochemical Properties, and Thermal Stability of Al-Doped LiNi[sub 1∕3]Mn[sub 1∕3]Co[sub (1∕3−z)]Al[sub z]O[sub 2] Positive Electrode Materials

Al-doped samples were synthesized using a coprecipitation method followed by calcination with at for and for . Electrochemical testing showed that had a high initial discharge capacity and good charge–discharge cycle performance in the voltage ranges of either 2.5–4.3 or . The impact of Al doping on the thermal stability of was studied by accelerating rate calorimetry. Al substitution for Co in caused a dramatic improvement in thermal stability over the material without aluminum. Al-doped with displays an energy density greater than and equivalent or higher thermal stability, making it a possible choice as an electrode material for large Li-ion batteries.