Home > Publications database > Enhancing ionic conductivity in $Li_{6+ x} Ge_x P_{1−x}S_5Br$: impact of $Li^+$ substructure on ionic transport and solid-state battery performance > print

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005     20250804115243.0
024 7 _ |a 10.1039/D5TA01651G
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024 7 _ |a 2050-7488
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024 7 _ |a 10.34734/FZJ-2025-02653
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037 _ _ |a FZJ-2025-02653
082 _ _ |a 530
100 1 _ |a Faka, Vasiliki
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245 _ _ |a Enhancing ionic conductivity in $Li_{6+ x} Ge_x P_{1−x}S_5Br$: impact of $Li^+$ substructure on ionic transport and solid-state battery performance
260 _ _ |a London ˜[u.a.]œ
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520 _ _ |a Solid-state batteries have been investigated as efficient energy storage systems due to the increased power and energy densities that they can offer compared to liquid-based batteries. The search for solid electrolytes with high ionic conductivities, sufficient electrochemical and mechanical stability is indispensable. In this work, the $Li_{6+ x} Ge_x P_{1−x}S_5Br$ substitution series is investigated via X-ray and neutron powder diffraction, as well as impedance and solid-state nuclear magnetic resonance spectroscopy. Structural analyses reveal the expansion of the cage-like $Li^+$ substructure with increasing degree of substitution of Ge(IV) for P(V) in $Li_{6+ x} Ge_x P_{1−x}S_5Br$. Solid-state nuclear magnetic resonance spectroscopy measurements reveal the gradual changes in cation environments ($^6Li$ and $^{31}P$) and the effect of Ge(IV) substitution on local $Li^+$ transport. Impedance spectroscopy shows an improvement of ionic conductivity at room temperature up to fivefold for $Li_{6.31}Ge_{0.31}P_{0.69}S_5Br$ and decreasing activation energies. Employing $Li_{6.31}Ge_{0.31}P_{0.69}S_5Br$ as a catholyte in $LiNi_xMn_yCo_zO_2$ based solid-state batteries results in reproducibly higher active material utilization and rate stability in comparison to $Li_6PS_5Br$. This work emphasizes the importance of understanding the $Li^+$ substructure of argyrodites in correlation with the $Li^+$ transport properties to systematically develop highly conductive $Li^+$ solid electrolytes for improved solid-state batteries.
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700 1 _ |a Samanta, Bibek
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700 1 _ |a Lange, Martin A.
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700 1 _ |a Helm, Bianca
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700 1 _ |a Martinez de Irujo-Labalde, Xabier
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700 1 _ |a Kierdorf, Niklas
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700 1 _ |a Ketter, Lukas
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700 1 _ |a Suard, Emmanuelle
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700 1 _ |a Kraft, Marvin A.
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700 1 _ |a Francisco, Brian E.
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700 1 _ |a Hansen, Michael Ryan
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700 1 _ |a Zeier, Wolfgang
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773 _ _ |a 10.1039/D5TA01651G
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