Crystallization of closo-borate electrolytes from solution enabling infiltration into slurry-casted porous electrodes for all-solid-state batteries
Autor: | Léo Duchêne, Seunggoo Jun, Yoon Seok Jung, Dong Hyeon Kim, Corsin Battaglia, Yong Bae Song, Arndt Remhof, Romain Moury, Hans Hagemann |
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Rok vydání: | 2020 |
Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Casting 0104 chemical sciences law.invention Chemical engineering law Electrode Slurry Ionic conductivity General Materials Science Crystallization 0210 nano-technology Porosity |
Zdroj: | Energy Storage Materials. 26:543-549 |
ISSN: | 2405-8297 |
Popis: | The direct crystallization of a closo-borate solid electrolyte from solution is demonstrated and applied to infiltrate porous battery electrodes fabricated by traditional slurry casting methods. Employing isopropanol as a solvent, we show that Na4(B12H12)(B10H10) crystallizes inside the open porosity of the electrodes with the appropriate crystal structure yielding high ionic conductivity (1 mS cm-1 at 25 °C) and providing efficient contact to the active materials. Very stable cycling is demonstrated at 30 °C for NaCrO2|Na-Sn half cells employing infiltrated NaCrO2 cathodes with mass loadings of ~7.7 mg cm-2 at rates up to 5C (4.5 mA cm-2). The all-solid-state cells exhibit remarkable cycling stability at moderate (70 MPa), and low (3 MPa) applied external pressure, retaining 95.6% and 85.9% of the initial capacity after 100 cycles at 0.5C respectively. A NaCrO2|Sn rocking-chair all-solid-state full cell with capacity-balanced infiltrated electrodes is also demonstrated. The more pronounced fading of the full cell is characterized with a three-electrode measurement and can be attributed to the poorer cyclability of Sn. This work bridges the gap between the attractive materials properties of closo-borate electrolytes and their integration into all-solid-state batteries facilitating their adoption in industrial cell production at scale. |
Databáze: | OpenAIRE |
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