Diffusion mechanism in the sodium-ion battery material sodium cobaltate.

ABSTRACT: High performance batteries based on the movement of Li ions in Li _x CoO₂ have made possible a revolution in mobile electronic technology, from laptops to mobile phones. However, the scarcity of Li and the demand for energy storage for renewables has led to intense interest in Na-ion batteries, including structurally-related Na _x CoO₂. Here we have determined the diffusion mechanism for Na_0.8CoO₂ using diffuse x-ray scattering, quasi-elastic neutron scattering and ab-initio molecular dynamics simulations, and we find that the sodium ordering provides diffusion pathways and governs the diffusion rate. Above T ~ 290 K the so-called partially disordered stripe superstructure provides channels for quasi-1D diffusion, and melting

SUBMITTER: Willis TJ 

PROVIDER: S-EPMC5816598 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature