Improving the Cycle Performance of LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 Cathode Material for Lithium-ion Batteries by Carbon Coating

摘要

Layered-cathode materials LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 coated with carbon have been synthesized by a heat treatment process for the purpose of improving the cycle performance. The carbon coating LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements respectively. It is found that, the sample coating on 1 wt% of graphite have discharge capacity of 132.96 mAhg~(-1), and with capacity retention of 91.51 % after 40 cycles at 1 C rate, respectively. The results show that, compared with the bare sample, the cycling performance of LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 could be significantly improved by coating on 1 wt% of graphite.