In Situ Formed Li–B–H Complex with High Li-Ion Conductivity as a Potential Solid Electrolyte for Li Batteries
2019
Zhu, Mengfei | Pang, Yuepeng | Lü, Fuqiang | Shi, Xinxin | Yang, Junhe | Zheng, Shiyou
Li–B–H complexes facilely prepared via partial dehydrogenation of LiBH₄ are presented in this study as solid electrolytes for Li batteries. An exceptionally high Li-ion conductivity is found for the Li–B–H complex with 7.5 wt % H₂ desorption under 3 bar H₂ pressure, which reaches 2.7 × 10–⁴ S cm–¹ at 35 °C, more than 4 orders higher than that of LiBH₄. In-depth characterizations show that LiH and [Li₂B₁₂H₁₁₊₁/ₙ]ₙ are in situ formed in the LiBH₄ matrix and the interface layer between [Li₂B₁₂H₁₁₊₁/ₙ]ₙ and LiBH₄ is believed to be responsible for the high Li-ion conductivity. Moreover, this Li–B–H complex also exhibits excellent electrochemical stability, which enables the stable cycling of all-solid-state batteries at room temperature.
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