Electrochemical and Thermal Characterization of AlF₃-coated Li[Ni_0.8Co_0.15Al_0.05]O₂ Cathode in Lithium-Ion Cells

H.-B. Kim^a, B.-C. Park^a, S.-T. Myung^b, K. Amine^c, Jai Prakash^d and Y.-K. Sun^a

^aHanyang University, Seoul, Republic of Korea
^bIwate University, Morioka, Iwate, Japan
^cArgonne National Laboratory, Argonne, IL, USA
^dIllinois Institute of Technology, Chicago, IL, USA

Abstract

Li[Ni_0.8Co_0.15Al_0.05]O₂ particles are modified with AlF₃ as a new coating material. Even though the initial discharge capacity of the coated Li[Ni_0.8Co_0.15Al_0.05]O₂ is almost the same as that of the pristine material, the capacity retention and the thermal stability, in a highly oxidized state are both significantly improved. This effect is attributed to the thin AlF₃ coating layer protecting the oxidized cathode particles from attack by hydrogen fluoride in the electrolyte.

Journal of Power Sources 179(1), 347-350 (2008)
©Elsevier 2008