Stabilizing lattice oxygen redox in layered sodium transition metal oxide through spin singlet state.

ABSTRACT: Reversible lattice oxygen redox reactions offer the potential to enhance energy density and lower battery cathode costs. However, their widespread adoption faces obstacles like substantial voltage hysteresis and poor stability. The current research addresses these challenges by achieving a non-hysteresis, long-term stable oxygen redox reaction in the P3-type Na_2/3Cu_1/3Mn_2/3O₂. Here we show this is accomplished by forming spin singlet states during charge and discharge. Detailed analysis, including in-situ X-ray diffraction, shows highly reversible structural changes during cycling. In addition, local CuO₆ Jahn-Teller distortions persist throughout, with dynamic Cu-O bond length variations. In-situ hard X-ray absorption and ex-situ soft

SUBMITTER: Wang X 

PROVIDER: S-EPMC10667238 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature