A Facile Technique Towards the Fabricate Carbon Modified Cathode for Lithium Ion Batteries

While the carbon coating layer can improve the electrode-electrolyte interface, it is widely used in lithium ion battery modification, the coating procedure remain complex. In this case, a simple solvent method is proposed to fabricate carbon modified LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811). The TEM and HRTEM photos reveal that the carbon layer is amorphous and uniformly distributed on the surface of the NCM particles. As cathode materials for lithium ion batteries, the C@NCM delivers an appealing initial reversible capacity of 198 mAh g⁻¹ at 0.1 C (1 C = 180 mA g⁻¹), superior capacity retention of 95.2% after 200 cycles (25 °C) at 1 C, 89.6% after 300 cycles at 2 C, good cycle stability at 60 °C and excellent rate capability of 148 mAh g⁻¹ at 10 C. Such enhanced electrochemical performance is mainly attributed to the smaller electrode polarization and lower charge transfer resistance after carbon coated.