Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany.
TUMInt.Energy Research GmbH, Lichtenbergstraße 4, 85747, Garching, Germany.
Angew Chem Int Ed Engl. 2023 Mar 1;62(10):e202213962. doi: 10.1002/anie.202213962. Epub 2023 Jan 24.
All-solid-state batteries are promising candidates for safe energy-storage systems due to non-flammable solid electrolytes and the possibility to use metallic lithium as an anode. Thus, there is a challenge to design new solid electrolytes and to understand the principles of ion conduction on an atomic scale. We report on a new concept for compounds with high lithium ion mobility based on a rigid open-framework boron structure. The host-guest structure Li B (Li N) comprises large hexagonal pores filled with Li N] strands that represent a perfect cutout from the structure of α-Li N. Variable-temperature Li NMR spectroscopy reveals a very high Li mobility in the template phase with a remarkably low activation energy below 19 kJ mol and thus much lower than pristine Li N. The formation of the solid solution of Li B (Li N) and Li B (Li O) over the complete compositional range allows the tuning of lithium defects in the template structure that is not possible for pristine Li N and Li O.
全固态电池由于其使用不可燃的固体电解质和使用金属锂作为阳极的可能性，是安全储能系统的有前途的候选者。因此，需要设计新型固体电解质并在原子尺度上理解离子传导的原理。我们报告了一种基于刚性开放式硼结构的具有高锂离子迁移率的化合物的新概念。主体-客体结构 Li B（Li N）包含由大的六边形孔填充的 Li N]链，这些链代表从α-Li N 结构的完美切割。变温 Li NMR 光谱显示，在模板相中具有非常高的 Li 迁移率，在低于 19 kJ mol 的极低活化能下，明显低于原始 Li N。Li B（Li N）和 Li B（Li O）的固溶体在完整的组成范围内的形成允许在模板结构中调整锂缺陷，这对于原始 Li N 和 Li O 是不可能的。
