Deciphering the Structural Transformations during Nickel Oxyhydroxide Electrode Operation

摘要

We have been able to determine the crystal structure of β-NiOOH and hence demonstrate that reversible severe structural changes take place in nickel battery positive electrodes upon operation which enables us to understand the operation mechanism of nickel-based batteries at the atomic level. Critical to the success of this task was the simultaneous consideration of structural and microstructural models in the Rietveld refinement of both the reduced phase and the oxidized phase and the combination of two complementary techniques, that is, HRTEM and powder diffraction.