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First-principles insight into the entanglements between superionic diffusion and Li/Al antisite in Al-doped Li1+xAlxGe2−x(PO4)3 (LAGP)

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Abstract

As an ion conductor, the Al-doped Li1+xAlxGe2−x(PO4)3 (LAGP) demonstrates the superionic Li diffusion behavior, however, without the convinced verifications. In this context, the density functional theory (DFT) calculations are employed to clarify the structural origin of the fast Li ion migration kinetics in LAGP solid electrolytes. The calculated results show that doping of Al leads to an emerging high-energy 36f Li site, which plays an important role in promoting the Li diffusion and can largely lower the Li ion diffusion energy barrier. Moreover, the Li/Al antisite defect is investigated firstly, with which the Li ions are excited to occupy a relatively high energy site in LAGP. The obvious local structural distortion by Li/Al antisite results in the coordination change upon Li diffusion (lattice field distortion), which facilitates the Li diffusion significantly and is probably the main reason to account for the superionic diffusion phenomenon. Therefore, the occupation of Li at high-energy sites should be an effective method to establish the fast Li diffusion, which implies a rewarding avenue to build better Li-ion batteries.

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Authors and Affiliations

  1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China

    ChangKun Jiang & DaPeng Cao

  2. School of Materials, Sun Yat-sen University, Guangzhou, 510006, China

    Xia Lu

Authors
  1. ChangKun Jiang
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  2. Xia Lu
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Correspondence to Xia Lu or DaPeng Cao.

Additional information

This work was supported by the National Key Research and Development Program of China (Grant No. 2019YFA0705700), National Natural Science Foundation of China (Grant No. 11704019), the Hundreds of Talents Program of Sun Yat-sen University and the Fundamental Research Funds for the Central Universities. Computational resources were provided by the National Supercomputing Center in Shenzhen.

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Jiang, C., Lu, X. & Cao, D. First-principles insight into the entanglements between superionic diffusion and Li/Al antisite in Al-doped Li1+xAlxGe2−x(PO4)3 (LAGP). Sci. China Technol. Sci. 63, 1787–1794 (2020). https://doi.org/10.1007/s11431-020-1562-3

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  • DOI: https://doi.org/10.1007/s11431-020-1562-3

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