SrCO ₃ Assisted Synthesis of Disk-Like Micron-Sized Monocrystalline LiNi _0.5 Co _0.2 Mn _0.3 O ₂ with Preferred (104) Plane and Its Enhanced Cycle Performance

Abstract

Disk-like micron-sized monocrystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 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 SrCO 3 help to form monocrystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 with preferred (104) plane, and the particle is disk-like and in micrometer size. Electrochemical test results indicate that the LiNi 0.5 Co 0.2 Mn 0.3 O 2 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 LiNi 0.5 Co 0.2 Mn 0.3 O 2 is ascribed to the unique monocrystalline morphology, high stability of (104) plane and reduced irreversible phase transition.