Influence of elastic strain on the thermodynamics and kinetics of lithium vacancy in bulk LiCoO2

Abstract

The influence of elastic strain on the lithium vacancy formation and migration in bulk LiCoO2 is evaluated by means of first-principles calculations within density functional theory (DFT). Strain dependent energies are determined directly from defective cells and also within linear elasticity theory from the elastic dipole tensor (Gij) for ground state and saddle point configurations. We analyze finite size-effects in the calculation of Gij, compare the predictions of the linear elastic model with those obtained from direct calculations of defective cells under strain and discuss the differences. Based on our data, we calculate the variations in vacancy concentration and mobility due to the presence of external strain in bulk LiCoO2 cathodes. Our results reveal that elastic in-plane and out-of-plane strains can significantly change the ionic conductivity of bulk LiCoO2 by an order of magnitude and thus strongly affect the performance of Li-secondary batteries.

References in corpus (6)

• A Finite Strain Model of Stress, Diffusion, Plastic Flow and Electrochemical Reactions in a Lithium-ion Half-cell
• Real-Time Stress Measurements in Lithium-ion Battery Negative-electrodes
• Point defect modeling in materials: coupling ab initio and elasticity approaches
• Elastic effects of vacancies in strontium titanate: Short- and long-range strain fields, elastic dipole tensors, and chemical strain
• Effect of strain on surface diffusion in semiconductor heteroepitaxy
• Effect of epitaxial strain on cation and anion vacancy formation in MnO

Cited by in corpus (2)

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