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| Home > Publications database > Alloy-based electrodes for all-solid-state Li-ion batteries based on garnet Ta-substituted Li7La3Zr2O12 solid electrolyte |
| Home > Publications database > Alloy-based electrodes for all-solid-state Li-ion batteries based on garnet Ta-substituted Li7La3Zr2O12 solid electrolyte |
| Poster (Outreach) | FZJ-2017-04403 |
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2017
Abstract: Since the dawn of Li-ion batteries, consumers have always been concerned about the safety of the electronic devices. Recent accidents (Samsung S7 Galaxy Note and Boeing 787 Dreamliner aircraft) have pushed to look for alternatives to liquid electrolytes considered to be the main risk for the low safety of the battery. Solid electrolytes are envisaged as alternative of organic liquid electrolytes since they promise to improve safety at both room and elevated temperatures. Among the already discovered inorganic Li-ion conductors, the garnet material with a cubic structure, Li7La3Zr2O12 (LLZO), offers both acceptable ionic conductivity at room temperature and chemical stability in contact with Li metal.1Generally, such solid electrolyte is often investigated in half-cells (vs. Li metal) coupled to oxide materials such as Li4Ti5O12 or LiCoO2 as negative and positive electrode, respectively. Although the garnet solid electrolyte (LLZO) was considered to be stable in the potential range from zero to six volt vs. Li/Li+, recent studies point out that the stability window could be drastically limited down to 2.9 V.2We investigated the electrochemical performance of alloy-based (Sn, Si) nanoparticles as electrode using a Ta-doped LLZO pellet as solid electrolyte to build all-solid-state Li half-cells. Alloy materials are known to be electrochemically active in the range 0-1.5 V vs. Li/Li+, thus, within the stability window of LLZO. The electrodes, prepared as either conventional slurry mixture, thin films or spray-coating and directly deposited on the surface of the electrolyte pellet, show reversible electrochemical activity comparable to the liquid counterpart except the possible absence of a solid electrolyte interphase (SEI). For the first time, we discuss the possibility to lithiate/delithiate reversibly alloy-based nanoparticles in combination with the garnet LLZO electrolyte and their interfacial stability. Such investigation is supported by electrochemical characterization coupled with surface and structural characterization (XPS, SEM and XRD).
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