Lithium diffusion in NASICON-type structures
The search for stable and incombustible inorganic solid electrolytes with high lithium ion conductivity is currently one of primary issues in battery research aiming at higher energy densities. The lithium based NASICON-type compounds with general formula LiM2(PO4)3 and M=Ge, Ti, Sn, Hf, Zr etc. were considered as promising candidates for their applications as solid lithium-ion conducting electrolytes. Their characterization is an important task of further material development, revealing the underlying Li-ion conduction mechanisms and identifying the most relevant transport limitations. The direct determination of diffusion pathways by bulk property measurements of polycrystalline samples is not possible, since it requires the accurate knowledge of crystal structure. The weaknesses of X-ray diffraction for accurate lithium determination make neutron powder diffraction indispensable. The proposed set of high-temperature neutron powder diffraction data on Al-doped LiZr(Ti)2(PO4)3 NASICON-type compounds from D20 in its high – resolution mode will provide the experimental background for a systematic development of solid electrolytes with enhanced Li-ion conductivity.
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MONCHAK Mykhailo; Thomas C. Hansen and SENYSHYN Anatoliy. (2014). Lithium diffusion in NASICON-type structures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-541
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