Advanced Performances of Full Concentration Gradient Li[Ni0.65Co0.08Mn0.27]O2 Cathode Materials for Lithium Ion Batteries

Full concentration gradient (FCG) cathode material which consists of Ni-rich core Li[Ni_0.89Co_0.01Mn_0.10]O₂ and Ni-less outer layer Li[Ni_0.61Co_0.09Mn_0.30]O₂ was synthesized by co-precipitation method.^1,2 A gradually changing concentration gradients for Ni, Co, and Mn extended from the core to the surface within a single cathode particle with an average composition of Li[Ni_0.65Co_0.08Mn_0.27]O₂. We have evaluated electrochemical and thermal properties of the FCG cathode material and compared it with the conventional cathode (CC) material, Li[Ni_0.65Co_0.08Mn_0.27]O₂ without the concentration gradient. The BET surface area measurement demonstrated the presence of high-density primary particles in the FCG cathode material. The FCG cathode exhibited higher discharge capacity, excellent cycle retention and superior thermal stability compared to the CC Li[Ni_0.65Co_0.08Mn_0.27]O₂ cathode material.¹

References

1. H.-J. Noh, Z. Chen, C. S. Yoon, J. Lu, K. Amine, and Y.-K. Sun, Chem. Mater., 25, 2109 (2013).

2. M. H. Lee,Y. J. Kang, S. T.Myung, andY. K. Sun, Electrochim. Acta. 50, 939 (2004).