The hexagonal high-temperature form of LiBH4 is known as a fast ion conductor. Here, we investigated its suitability as a solid electrolyte in high-temperature all-solid-state cells when combined with the following active materials: Li metal, graphite, lithium titanium oxide (Li4Ti5O12, LTO), and nanocrystalline rutile (TiO2). First results using lithium anodes and rutile nanorods as cathode material show that a cell constructed by simple cold-pressing operates at reversible discharge capacities in the order of 125 mA h g−1 at a C-rate of C/5 and at temperatures as high as 393 K. Besides TiO2, the compatibility of the LiBH4 with other active materials such as graphite and LTO was tested. We found evidence of possible interface instabilities that manifest through rare, yet still detrimental, self-charge processes that may be relevant for hydrogen storage applications. Moreover, we investigated the long-term cycling behavior of the cells assembled and demonstrate the successful employment of LiBH4 as an easily processable model solid electrolyte in practical test cells.

中文翻译：

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以LiBH4为电解质的高温全固态电池——以TiO2纳米棒、Li4Ti5O12和石墨为活性材料性能的案例研究

LiBH的六方高温形态4被称为快离子导体。在这里，我们研究了它与以下活性材料结合时作为高温全固态电池中固体电解质的适用性：锂金属、石墨、锂钛氧化物（Li4钛5氧12，LTO）和纳米晶金红石（TiO2）。使用锂阳极和金红石纳米棒作为阴极材料的初步结果表明，通过简单冷压构建的电池可在 125 mA hg 的可逆放电容量下运行−1在一个C-比率C/5 且温度高达 393 K。除了 TiO2, LiBH 的兼容性4与其他活性材料（例如石墨和 LTO）进行了测试。我们发现了可能存在界面不稳定性的证据，这些不稳定性通过罕见但仍然有害的自充电过程表现出来，这可能与储氢应用相关。此外，我们研究了组装电池的长期循环行为，并证明了 LiBH 的成功应用4作为实际测试电池中易于加工的模型固体电解质。