Modified Ni-Rich LiNi0.8Co0.1Mn0.1O2 Cathode Material via Li3BO3 Coating for Lithium Batteries

Abstract

High nickel ternary cathode materials are less expensive, more productive, and less environmentally harmful than conventional cathode materials. Thus, it becomes one of the best cathode materials for lithium-ion batteries. However, there are also clear drawbacks to high nickel ternary materials, for instance its inadequate cycle life, poor structural and heat stability, which limit its future development. In this work, LiNi0.8Co0.1Mn0.1O2 (NCM811) material was studied and modified using Li3BO3, a lithium-ion conductor-type compound, as its coating layer. Studies reveal that after 1 wt percent -Li3BO3 coating, the first discharge capacity at a 2 C rate rose from 162.7 mAh g-1 to 185.9 mAh g-1. After 250 cycles, the capacity retention of the Li3BO3-coated sample was 87%, compared to just 82.5% for the uncoated sample. The introducing of Li3BO3 coating material of NCM811 can significantly improve the electrochemical performance of materials for lithium-ion battery cathodes that are high in nickel ternary.