SrCO3 Assisted Synthesis of Disk-Like Micron-Sized Monocrystalline LiNi0.5Co0.2Mn0.3O2 with Preferred (104) Plane and Its Enhanced Cycle Performance

Abstract

Disk-like micron-sized monocrystalline LiNi0.5Co0.2Mn0.3O2 is synthesized by the co-precipitation method accompanied with calcination assisted by strontian carbonate without washing process or other complicated treatment. Powder X-ray diffraction, scanning electron microscopy, and transmission electron microscopy are used to characterize the obtained samples. Characterizations reveal that the addition of SrCO3 help to form monocrystalline LiNi0.5Co0.2Mn0.3O2 with preferred (104) plane, and the particle is disk-like and in micrometer size. Electrochemical test results indicate that the LiNi0.5Co0.2Mn0.3O2 exhibits significantly improved capacity retentions of 95.6% and 89.3% after 100 cycles at 1C, for the voltage ranges of 2.8−4.3 V and 2.8−4.5 V, respectively. The excellent cycle performance of the LiNi0.5Co0.2Mn0.3O2 is ascribed to the unique monocrystalline morphology, high stability of (104) plane and reduced irreversible phase transition.