Abstract
In order to get homogeneous layered oxide Li[Ni 1/3Mn 1/3Co 1/3]O 2 as a lithium insertion positive electrode material, we applied carbonate co-precipitation. The oxide compounds were synthesized under different annealing temperature. XRD experiment revealed that the layered Li[Ni 1/3Mn 1/3Co 1/3]O 2 material can be synthesized at lower temperature of 750 °C, and the oxidation state of Ni, Mn and Co in the cathode confirmed by XPS were 2+, 4+ and 3+, respectively. SEM observation shows that the synthesized materials have spherical particle morphology and the morphology could be controlled by carbonate co-precipitation method. The cathode synthesized at 800 °C showed small irreversible capacity loss of 10.72% and high discharge capacity of 186.7 mAh g −1 as well as stable cycling performance in the voltage range 2.8–4.5 V Li / L i + . In spite of difference in specific surface area, rate capability of the samples synthesized in the temperature range 750–900 °C showed similar rate capability and all these cathodes delivered high discharge capacity of over than 143 mAh g −1 at 2.5 C (450 mA g −1).
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