Reducing intrinsic drawbacks of Ni-rich layered oxide with a multifunctional materials dry-coating strategy

Herein, we introduce a multifunctional materials dry coating strategy on LiNi0.8Mn0.1Co0.1O2 (NMC811) at 1 wt% with a thickness of ca. 100 nm. The materials included high chemical stable Al2O3 (0.33 wt%) to reduce parasitic reactions, high electrical carbon black (0.33 wt%) to reduce internal charge transfer resistance, and high ionic conductive Li7La3Zr2O12 (0.33 wt%) to enhance Li+ diffusion. The scalable dry coating mechanofusion used can also generate a smooth surface of spherical NMC811 particles enhancing its stability. With an exceptional property of mixed multi-functional materials, the cell of encapsulated NMC811 can perform up to 1000 cycles with 80% capacity retention. Whilst the pristine NMC811 cell can maintain only 39%. The coated NMC811 provides a two-fold specific capacity at a high C-rate (2.0C) compared to the pristine one. Moreover, it also offers excellent safety based on the UN38.3 standard at 18650 cylindrical cells. This multifunctional coating concept may lead to the further development of high-performance Li-ion batteries. [Display omitted] •Reducing intrinsic drawbacks of NMC811with a multifunctional materials coating.•Carbon black-Al2O3– Li7La3Zr2O12-NMC811 strong bond at the interface.•Carbon black can reduce internal resistance of NMC811 Li-ion batteries.•Al2O3 can reduce parasitic reactions of NMC811.•Li7La3Zr2O12 can enhance Li-ion diffusion.