Li1.4Al0.4Ti1.6(PO4)3 coating surface modification enables improved electrochemical performance of LiNi0.83Co0.11Mn0.06O2 cathode

Abstract

High-nickel ternary active materials with LiNi0.83Co0.11Mn0.06O2 (NCM83) have attracted extensive attention from researchers because of their exceptional performance and competitive pricing. Nevertheless, the actual large-scale uses of this material are restricted due to its limited lithium vacancies, residual lithium on the surface, and poor thermal stability. To improve the electrochemical performance of NCM83, an effective strategy for coating high ionic conductors of Li1.4Al0.4Ti1.6(PO4)3 (LATP) on NCM83 has been proposed. The uniform coatings of LATP are prepared by a wet coating process, which efficiently protects NCM83 from electrolyte attack, reduces internal stress, and improves the material’s thermal stability. Consequently, the cycle stability and thermal stability of the coated cathodes are significantly enhanced. Typically, 1 wt% LATP coating delivers a higher discharge specific capacity of 179.3 mAh g−1 at 2 C. The capacity retention rate is 69.67 % after 300 cycles at 1 C, higher than NCM83 (capacity retention rate of only 61.27 %). This study presents a new direction for researching high-nickel ternary cathode materials.