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Title: Li-Ion Diffusion Correlations in LiAlGeO4: Quasielastic Neutron Scattering and Ab Initio Simulation

Journal Article · · ACS Applied Energy Materials

Here, we investigated the impact of Li stoichiometry and host flexibility on Li+ diffusion processes in LiAlGeO4 at the microscopic level using quasielastic neutron scattering (QENS) and ab initio molecular dynamics (AIMD) simulations. Using sufficiently long AIMD trajectories, we could simulate the observed QENS signal and identify the localized dynamics of Li in crystalline LiAlGeO4. Such information is vital to identify the bottleneck of diffusion processes and design materials for battery application. Our AIMD simulations in LiAlGeO4 reveal that the Li+ conductivity can be significantly improved by manipulating the Li stoichiometry and/or host flexibility via amorphization. We determined that excess Li stoichiometry enhances the Coulomb repulsion of neighboring Li sites and softens the host structure to enable faster Li+ diffusion along the hexagonal c-axis. In the amorphous structure, random orientations of AlO4 and GeO4 polyhedral units create a wide distribution of intersite distances and significantly soften the host structure, greatly enhancing the Li+ diffusion. The simulations are used to understand the nature of diffusion, especially the role of the host structure, the possible hopping pathways, and the diffusion behavior in various structures of LiAlGeO4.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Indian National Science Academy (INSA)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1906559
Journal Information:
ACS Applied Energy Materials, Vol. 5, Issue 11; ISSN 2574-0962
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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