Dual perovskite La2NiMnO6 coating modified LiNi0.8Co0.1Mn0.1O2 as cathode material for lithium ion batteries

Layer LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) has become one of the promising cathode materials in lithium ion batteries due to its high energy density, structural stability and low cost. However, severe lithium nickel mixing and surface side reactions lead to poor cycling stability and rate performance. To address this issue, dual perovskite La 2 NiMnO 6 (LNMO) coated NCM cathode is designed and prepared. The results indicate that an appropriate amount of LNMO coating effectively improves the cycling and rate performance of the NCM. After 100 cycles at 1.0C, the capacity retention rate of NCM coated with 1 wt% LNMO (LNMO1.0-NCM) reaches 84.9 % compared to 69.5 % of original NCM. At a high rate of 5.0C, the LNMO1.0-NCM shows 143.5 mAh g −1 of the specific capacity, higher than 128.4 mAh g −1 of the NCM. Therefore, LNMO coating can not only serve as a protective layer to prevent electrode materials from being corroded by the electrolyte, but also promote the diffusion rate of lithium ions and accelerate diffusion kinetics. • La 2 NiMnO 6 coating reduces the Li + /Ni 2+ mixing in NCM, ensuring material stability. • La 2 NiMnO 6 coating enhances the Li + migration and protects NCM from electrolyte corrosion. • La 2 NiMnO 6 coated NCM exhibits superior rate capability and capacity retention.