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Article

Stabilization of Superionic-Conducting High-Temperature Phase of Li(CB9H10) via Solid Solution Formation with Li2(B12H12)

1
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2
WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
*
Authors to whom correspondence should be addressed.
Academic Editors: Zhao Qian, Hai-Wen Li and Abdel El-kharbachi
Crystals 2021, 11(4), 330; https://doi.org/10.3390/cryst11040330
Received: 19 February 2021 / Revised: 22 March 2021 / Accepted: 24 March 2021 / Published: 25 March 2021
We report the stabilization of the high-temperature (high-T) phase of lithium carba-closo-decaborate, Li(CB9H10), via the formation of solid solutions in a Li(CB9H10)-Li2(B12H12) quasi-binary system. Li(CB9H10)-based solid solutions in which [CB9H10] is replaced by [B12H12]2− were obtained at compositions with low x values in the (1−x)Li(CB9H10)−xLi2(B12H12) system. An increase in the extent of [B12H12]2− substitution promoted stabilization of the high-T phase of Li(CB9H10), resulting in an increase in the lithium-ion conductivity. Superionic conductivities of over 10−3 S cm−1 were achieved for the compounds with 0.2 ≤ x ≤ 0.4. In addition, a comparison of the Li(CB9H10)−Li2(B12H12) system and the Li(CB9H10)−Li(CB11H12) system suggests that the valence of the complex anions plays an important role in the ionic conduction. In battery tests, an all-solid-state Li–TiS2 cell employing 0.6Li(CB9H10)−0.4Li2(B12H12) (x = 0.4) as a solid electrolyte presented reversible battery reactions during repeated discharge–charge cycles. The current study offers an insight into strategies to develop complex hydride solid electrolytes. View Full-Text
Keywords: complex hydride; solid electrolyte; all-solid-state battery; supoerionic conductor; phase transition; high-temperature phase complex hydride; solid electrolyte; all-solid-state battery; supoerionic conductor; phase transition; high-temperature phase
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MDPI and ACS Style

Kim, S.; Kisu, K.; Orimo, S.-i. Stabilization of Superionic-Conducting High-Temperature Phase of Li(CB9H10) via Solid Solution Formation with Li2(B12H12). Crystals 2021, 11, 330. https://doi.org/10.3390/cryst11040330

AMA Style

Kim S, Kisu K, Orimo S-i. Stabilization of Superionic-Conducting High-Temperature Phase of Li(CB9H10) via Solid Solution Formation with Li2(B12H12). Crystals. 2021; 11(4):330. https://doi.org/10.3390/cryst11040330

Chicago/Turabian Style

Kim, Sangryun, Kazuaki Kisu, and Shin-ichi Orimo. 2021. "Stabilization of Superionic-Conducting High-Temperature Phase of Li(CB9H10) via Solid Solution Formation with Li2(B12H12)" Crystals 11, no. 4: 330. https://doi.org/10.3390/cryst11040330

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