28. Direct Solution-Based Synthesis of Na₄(B₁₂H₁₂)(B₁₀H₁₀) Solid Electrolyte
    Gigante, A.; Duchêne, L.; Moury, R.; Pupier, M.; Remhof, A.; Hagemann, H.
    ChemSusChem 2019, 12, 4832-4837

All-solid-state batteries (ASSBs) promise higher power and energy density compared to batteries based on liquid electrolytes. Recently, a stable 3V ASSB based on the super ionic conductor (1mS cm^-1 near room temperature) Na₄(B₁₂H₁₂)(B₁₀H₁₀) has demonstrated excellent cycling stability. Herein we developed a 5 steps, scalable and solution-based synthesis of Na₄(B₁₂H₁₂)(B₁₀H₁₀). The use of the wet chemistry approach allows solution processing with high throughput and addresses the main drawbacks for this technology, specifically, the limited electrodes-electrolyte contact and high cost. Moreover, through the same process, we achieved a cost efficient synthesis for the expensive precursors Na₂B₁₀H₁₀ and Na₂B₁₂H₁₂. We investigated the mechanism of the reactions and highlighted two key parameters to tune the kinetics and selectivity: the choice of the counter cation, herein tetraethylammonium ((C₂H₅)₄N⁺, TEA⁺), and the solvent.

DOI : 10.1002/cssc.201902152 

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