Mitigation of Jahn-Teller distortion and Na⁺/vacancy ordering in a distorted manganese oxide cathode material by Li substitution.

ABSTRACT: Layered manganese-based oxides are promising candidates as cathode materials for sodium-ion batteries (SIBs) due to their low cost and high specific capacity. However, the Jahn-Teller distortion from high-spin Mn³⁺ induces detrimental lattice strain and severe structural degradation during sodiation and desodiation. Herein, lithium is introduced to partially substitute manganese ions to form distorted P'2-Na_0.67Li_0.05Mn_0.95O₂, which leads to restrained anisotropic change of Mn-O bond lengths and reinforced bond strength in the [MnO₆] octahedra by mitigation of Jahn-Teller distortion and contraction of MnO₂ layers. This ensures the structural stability during charge and discharge of P'2-Na_0.67Li_0.05

SUBMITTER: Liu Y 

PROVIDER: S-EPMC8179102 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature