Mo–F Co-Doping LiNi0.83Co0.11Mn0.06O2 Stabilizes the Structure and Induces Compact Primary Particle To Improve the Electrochemical Performance

Abstract

The Li+/Ni2+ cation disorder, material pulverization, surface phase transition, and transition metal (TM) ion dissolution are important issues that plague nickel-rich layered oxide cathode materials. In this paper, doping LiNi0.83Co0.11Mn0.06O2 with Mo6+ cation and F– anion effectively alleviates the above problems. The Mo6+ reduces the cations mixing, and the strong electronegativity of F strengthens the bonding with transition metal ions to resist HF corrosion. Furthermore, compact primary particles with interfused and radially aligned morphology induced by Mo–F co-doping reduce stress damage during cycling. The enhancement of electrochemical performance by Mo–F co-doping is systematically researched in terms of structure, morphology, secondary spherical pulverization, structural phase transition, and dissolution of transition metal ions.