Improved electrochemical performances of LiNi0.8Co0.1Mn0.1O2 cathode via SiO2 coating

Surface-modified LiNi0.8Co0.1Mn0.1O2 cathode with different coating amounts of SiO2 (0.25–1 wt%) is successfully synthesized and its electrochemical performances are investigated. Compared to bare LiNi0.8Co0.1Mn0.1O2, the 0.25 wt% SiO2 coated LiNi0.8Co0.1Mn0.1O2 delivers an initial capacity of 200.7 mAh g−1 as well as the excellent cyclability (capacity retention of 87.3% after 100 cycles at 0.5C) and rate capability (82.2% at 2C). Furthermore, 0.25 wt% SiO2 coated LiNi0.8Co0.1Mn0.1O2 exhibits the stable cycle performance at 55 °C (84.5% after 100 cycles at 0.5C). Such improvements are attributed to the SiO2 coating, which can suppress the irreversible phase transformation and play a role in obstacle to protect the LiNi0.8Co0.1Mn0.1O2 from electrolyte.