Crystallization of closo-borate electrolytes from solution enabling infiltration into slurry-casted porous electrodes for all-solid-state batteries
- Title
- Crystallization of closo-borate electrolytes from solution enabling infiltration into slurry-casted porous electrodes for all-solid-state batteries
- Author
- 정윤석
- Keywords
- Solid state battery; Full cell; Hydroborate; Infiltration process
- Issue Date
- 2019-11
- Publisher
- Elsevier BV
- Citation
- Energy Storage Materials, v. 26, Page. 543-549
- Abstract
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S2405829719310748?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/154957
- ISSN
- 2405-8297
- DOI
- 10.1016/j.ensm.2019.11.027
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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