Crystallization of closo-borate electrolytes from solution enabling infiltration into slurry-casted porous electrodes for all-solid-state batteries

Léo Duchêne, Dong Hyeon Kim, Yong Bae Song, Seunggoo Jun, Romain Moury, Arndt Remhof, Hans Hagemann, Yoon Seok Jung, Corsin Battaglia

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)543-549
Number of pages7
JournalEnergy Storage Materials
Volume26
DOIs
Publication statusPublished - 2020 Apr

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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