Surface engineering of Li- and Mn-rich layered oxides for superior Li-ion battery

The Li- and Mn-rich layered oxides (R-LNCM) are considered as promising cathode materials for high-energy density lithium-ion batteries (LIBs). However, the interface side reaction aggravates the voltage and capacity fading between cathode material and electrolyte at high voltage, which severely hinders the practical application of LIBs. Herein, lithium polyacrylate (LiPAA) as the binder and coating agent is applied to suppress the voltage and capacity fading of R-LNCM electrode. The flexible LiPAA layers with high elasticity are capable of impeding cathode cracks on the particle surface via mechanical stress relief. Thus, superior voltage and capacity fading suppression on R-LNCM electrode is finally achieved. As a result, LiPAA-R-LNCM cathode exhibits a remarkable specific capacity of 186 mA‧h‧g −1 with ~ 73% retention at 1 ℃ after 200 cycles. Further, the corresponding average discharge potential is maintained to ~ 3.1 V with only ~ 0.4 V falling.