| Autor: |
Garcia, Andrea, Müller, Gian, Černý, Radovan, Rentsch, Daniel, Asakura, Ryo, Battaglia, Corsin, Remhof, Arndt |
| Zdroj: |
Journal of Materials Chemistry A; 9/21/2023, Vol. 11 Issue 35, p18996-19003, 8p |
| Abstrakt: |
Hydridoborates are a promising class of solid electrolytes for solid-state batteries, combining liquid-like room temperature ionic conductivity, high (electro-)chemical stability, low gravimetric density, easy processability, and low toxicity. We show that cation exchange is a feasible method to prepare Li2B10H10 and Li2B12H12 from Na2B10H10 and Na2B12H12, respectively, with high yields. Ball milling of an equimolar mixture of Li2B10H10 and Li2B12H12 yields a single phase, isomorphic to the low temperature Li2B12H12 phase (space group Pa3¯) with ordered [B12H12]2− and disordered [B10H10]2− anions sharing the same position in the structure. The ionic conductivity of the equimolar mixture Li4B10H10B12H12 exhibits 4 × 10−4 S cm−1 at 25 °C and 4 × 10−3 S cm−1 at 60 °C, respectively, exceeding those of the unmixed phases by several orders of magnitude. The electrolyte possesses an oxidative stability >3 V vs. Li+/Li and thermal stability beyond 300 °C, and is evaluated in proof-of-concept solid-state batteries with a lithium metal anode and with titanium disulfide (TiS2) or lithium iron phosphate (LiFePO4) as a cathode active material. Discharge capacities of 83% and 73% of the theoretical capacity were achieved for TiS2 and LiFePO4, respectively, at the end of the first dis-/charge cycle. For LiFePO4, the de-/lithiation potential lies outside the electrochemical stability window of the electrolyte, requiring additional measures to protect the electrolyte from decomposition. Our study demonstrates the feasibility of using closo-hydridoborates as ionic conductors in solid-state lithium batteries. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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