Ni-based cathode materials have been as an alternative to LiCoO₂[1,2]. Therefore, many studies have been performed to solve the inherent problems of Ni-base cathode materials [3].  However, reasonable solution for rate performance and thermal stability of Ni-based cathode materials has not been reported. Coating method on the cathode material may become the solution technique for electrochemical properties.

In this study, LiNi_0.5Co_0.2Mn_0.3O₂ cathode materials were prepared by co-precipitation method. RuO₂ coating layer was deposited on LiNi_0.5Co_0.2Mn_0.3O₂powder using a shower head type PEALD reactor (Lucida-M100, NCD Technology), with IMBCH Ru [IMBCH = (η6-1-isopropyl-4-methylbenzene)(η4-cyclohexa-1,3-diene)] as a precursor.

We propose a new coating method for cathode materials using atomic layer deposition. The physical and electrochemical properties of RuO₂ coated LiNi_0.5Co_0.2Mn_0.3O₂ cathode materials have been thoroughly investigated. Compared to various metal oxides, we will show that the optimization of RuO₂ coating layer can be significantly improved the electrochemical performance of LiNi_0.5Co_0.2Mn_0.3O₂cathode materials.

References

[1] Y. S. Lee, D. Ahn, Y. H. Cho, T. E. Hong, J. Cho, J. Electrochem. Soc., 158 A1354 (2011)

[2] E. Rossen, C. D. W. Jones, and J. R. Dahn, Solid State Ionics, 57 311 (1992)

[3] Y. Kim, H. S. kim, S. W. Martin, Electrochim. Acta, 52 1316 (2006)