Modification on the structural stability of LiNi0.8Co0.1Mn0.1O2 cathode materials via Pr-doping by the solid-state method

Abstract

In this research, the Pr-doped LiNi0.8Co0.1Mn0.1O2 material was prepared successfully via the solid-state method. The significant improvement on the material structural stability was confirmed by the experimental results (XRD, SEM, and XPS, etc.). What’s more, the Pr-2500 sample exhibited the best electrochemical performance with the capacity retention rate 94.43% (3.0–4.4 V, 1 C (180 mA g−1), 25 °C, after 100 cycles), while the capacity retention rate of the Pristine was only 83.40%. Furthermore, the degree of the electrochemical polarization and the electrochemical impedance were reduced after modification. The excellent electrochemical properties were ascribed to the higher structure stability after modification, and the more stable structure may benefit from the higher bond dissociation energies (753 kJ mol−1) of Pr-O.