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Direct Solution‐Based Synthesis of Na 4 (B 12 H 12 )(B 10 H 10 ) Solid Electrolyte

2019; Wiley; Volume: 12; Issue: 21 Linguagem: Inglês

10.1002/cssc.201902152

1864-564X

Angelina Gigante, Léo Duchêne, Romain Moury, Marion Pupier, Arndt Remhof, Hans Hagemann,

Advancements in Battery Materials

Abstract All‐solid‐state batteries (ASSBs) promise higher power and energy density than batteries based on liquid electrolytes. Recently, a stable 3 V ASSB based on the super ionic conductor (1 mS cm −1 near room temperature) Na 4 (B 12 H 12 )(B 10 H 10 ) has demonstrated excellent cycling stability. This study concerns the development of a five‐step, scalable, and solution‐based synthesis of Na 4 (B 12 H 12 )(B 10 H 10 ). The use of a wet chemistry approach allows solution processing with high throughput and addresses the main drawbacks for this technology, specifically, the limited electrode–electrolyte contact and high cost. Moreover, a cost‐efficient synthesis of the expensive precursors Na 2 B 10 H 10 and Na 2 B 12 H 12 is also achieved through the same process. The mechanism of the reactions is investigated and two key parameters to tune the kinetics and selectivity are highlighted: the choice of counter cation (tetraethylammonium) and solvent.