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Issue 10, 2018
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Enhancing lithium-ion conductivity in NASICON glass-ceramics by adding yttria

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Abstract

We demonstrate that the ionic conductivity of Li1+xAlxGe2−x(PO4)3 glass-ceramic electrolytes can be tailored by adding Y2O3 to Li2O–Al2O3–GeO2–P2O5 melts. We found that the addition of 5 vol% Y2O3 causes noticeable changes in further glass crystallization process as the key parameters (glass crystallization temperature, viscosity and others) are affected. Small-angle neutron scattering data suggest that Y-containing glasses are suddenly crystallized upon heat treatment producing uniform Li1+xAlxGe2−x(PO4)3 ceramics. Due to the lower resistance of intergrain interfaces, such samples demonstrate a specific ionic conductivity of 0.5 mS cm−1, which is nearly 5 times higher in comparison to Y-free ceramics, prepared under similar conditions. We speculate that such an effect is caused primarily by better intergrain contact in Y-containing ceramics, along with better ionic transport in the grain bulk as evidenced by 7Li NMR.

Graphical abstract: Enhancing lithium-ion conductivity in NASICON glass-ceramics by adding yttria

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Publication details

The article was received on 03 Nov 2017, accepted on 16 Jan 2018 and first published on 16 Jan 2018


Article type: Paper
DOI: 10.1039/C7CE01910F
Citation: CrystEngComm, 2018,20, 1375-1382
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    Enhancing lithium-ion conductivity in NASICON glass-ceramics by adding yttria

    V. A. Vizgalov, T. Nestler, L. A. Trusov, I. A. Bobrikov, O. I. Ivankov, M. V. Avdeev, M. Motylenko, E. Brendler, A. Vyalikh, D. C. Meyer and D. M. Itkis, CrystEngComm, 2018, 20, 1375
    DOI: 10.1039/C7CE01910F

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