The origin of heavy element doping to relieve the lattice thermal vibration of layered materials for high energy density Li ion cathodes

Abstract

We report an effective strategy to inhibit the phase transition of LiCoO2 from hexagonal layered to cubic spinel during delithiation. The small thermal vibration amplitude of the Sn dopant helps pin the lattice vibration, stabilizing CoO6 octahedra during charge/discharge.