Lithium ion Conductor and Electronic Conductor Co-coating Modified Layered Cathode Material LiNi1/3Mn1/3Co1/3O2

Abstract According to the working principle of Lithium ion batteries, a perfect coating layer should not only be a lithium ion conductor but also an electronic conductor. In this work, the layered cathode material LiNi 1/3 Mn 1/3 Co 1/3 O 2 was modified by a dual functional coating layer created from the Li-ion conductor Li 2 SiO 3 and electronic conductor carbon. It was found that the modified LiNi 1/3 Mn 1/3 Co 1/3 O 2 showed outstanding electrochemical performance after being coated with an appropriate content of Li 2 SiO 3 &C. Particularly, at the high current density of 5C (1C = 160 mA/g), the LiNi 1/3 Mn 1/3 Co 1/3 O 2 coated with Li 2 SiO 3 &C could still deliver a discharge capacity of 96 mAh/g after 500 cycles with a capacity retention of 89.62%. In comparison, the pristine only delivered a discharge capacity of 71 mAh/g after 450 cycles. Furthermore, our strategy is convenient and universal, it can also be applied to other layered cathode materials to ameliorate their electrochemical properties.