Creating percolating Li diffusion pathways via Ge substitution enables the fabrication of thick-electrode oxide all-solid-state batteries
Abstract
Even though oxide solid electrolytes (SEs) have several advantages such as high chemical/thermal stability over conventional liquid electrolytes, their low ionic conductivity and difficult integration during cell fabrication hinder practical application. Here, the Li ionic conductivity of the LISICON (lithium super ionic conductor)-type SE is enhanced by substitution of Ge, achieving conductivity approximately 5 times higher than that of the unsubstituted. The Ge substitution can not only increase the concentration of Li but also enhance partial occupancies of Li at specific sites, enabling additional Li diffusion pathways and thereby leading to high ionic conductivity. Surprisingly, unlike other Ge-based solid electrolytes, the Ge-substituted LISICON-type SE exhibits excellent wetting behavior with Li metal and co-sintering capability with high-capacity cathodes even at temperatures above 700 °C. The increased Li ionic conductivity and excellent co-sintering capability enable the fabrication of an all-solid-state battery (ASSB) with an ultra-thick composite electrode (∼140 µm), which delivers high electrochemical activity/reversibility at room temperature without external pressure. These findings clearly demonstrate that the LISICON-type SE with enhanced Li ionic conductivity provides a completely novel strategy for achieving high energy density in ASSBs and offers a promising route toward practical application of oxide-based SEs in high-energy density ASSBs.
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BibTeX
@article{woo2026creating,
title = {{Creating percolating Li diffusion pathways via Ge substitution enables the fabrication of thick-electrode oxide all-solid-state batteries}},
author = {Seungjun Woo and Junhyung Park and Donghun Lee and Woojin Song and Zhan Yu and Hong Zhu and Maxim Avdeev and Nicolas Dupré and Byoungwoo Kang},
journal = {Journal of Materials Chemistry A},
year = {2026},
month = oct,
doi = {10.1039/d6ta00467a},
url = {https://hal.science/hal-05685807v2},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Creating percolating Li diffusion pathways via Ge substitution enables the fabrication of thick-electrode oxide all-solid-state batteries
AU - Seungjun Woo
AU - Junhyung Park
AU - Donghun Lee
AU - Woojin Song
AU - Zhan Yu
AU - Hong Zhu
AU - Maxim Avdeev
AU - Nicolas Dupré
AU - Byoungwoo Kang
PY - 2026
DA - 2026/10/08
JO - Journal of Materials Chemistry A
DO - 10.1039/d6ta00467a
UR - https://hal.science/hal-05685807v2
AB - Even though oxide solid electrolytes (SEs) have several advantages such as high chemical/thermal stability over conventional liquid electrolytes, their low ionic conductivity and difficult integration during cell fabrication hinder practical application. Here, the Li ionic conductivity of the LISICON (lithium super ionic conductor)-type SE is enhanced by substitution of Ge, achieving conductivity approximately 5 times higher than that of the unsubstituted. The Ge substitution can not only increase the concentration of Li but also enhance partial occupancies of Li at specific sites, enabling additional Li diffusion pathways and thereby leading to high ionic conductivity. Surprisingly, unlike other Ge-based solid electrolytes, the Ge-substituted LISICON-type SE exhibits excellent wetting behavior with Li metal and co-sintering capability with high-capacity cathodes even at temperatures above 700 °C. The increased Li ionic conductivity and excellent co-sintering capability enable the fabrication of an all-solid-state battery (ASSB) with an ultra-thick composite electrode (∼140 µm), which delivers high electrochemical activity/reversibility at room temperature without external pressure. These findings clearly demonstrate that the LISICON-type SE with enhanced Li ionic conductivity provides a completely novel strategy for achieving high energy density in ASSBs and offers a promising route toward practical application of oxide-based SEs in high-energy density ASSBs.
SN - 2050-7488
SN - 2050-7496
ER -