Dual-shell silicate and alumina coating for long lasting and high capacity lithium ion batteries

Here we demonstrate a theory-driven, novel dual-shell coating system of Li2SrSiO4 and Al2O3, achieved via a facile and scalable sol-gel technique on LiCoO2 electrode particles. The optimal thickness of each coating can lead to increased specific capacity (similar to 185 mAh/g at 0.5C-rate) at a cut-off potential of 4.5 V, and greater cycling stability at very high C rates (up to 10C) in half-cells with lithium metal. The mechanism of this superior performance was investigated using a combination of X-ray and electron characterization methods. It shows that the results of this investigation can inform future studies to identify still better dual-shell coating schemes, achieved by such industrially feasible techniques, for application on similar, nickel-rich cathode materials. (c) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Automated summary

This study demonstrates a novel dual-shell coating system on LiCoO2 electrode particles using a facile and scalable sol-gel technique. The coating system composed of Li2SrSiO4 and Al2O3 exhibits superior cycling stability and specific capacity.