Fluoride-ion batteries (FIBs) are promising candidates for next-generation batteries because of their high theoretical energy density. A Ruddlesden-Popper perovskite oxide, LaSrMnO, is not only a known host material that undergoes fluoride-ions intercalation/deintercalation reactions but also exhibits a high capacity and good cyclability when used as a cathode material of FIBs. However, the kinetics of fluoride-ion intercalation/deintercalation in this compound must be further improved for practical application. In this study, we control the interlayer distance to improve the fluoride-ion diffusion by systematically changing in LaSrMnO. The interlayer distance shows a maximum at = 0.35 despite a monotonous decrease of the -axis length with increasing . The expansion of the interlayer distance suppresses the coulombic repulsion between fluoride-ions and oxide ions, favoring good capacity retention even at higher current densities.

中文翻译：

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通过控制氟离子电池的层间距离加速层状钙钛矿阴极中氟离子的嵌入/脱嵌

氟离子电池（FIB）因其高理论能量密度而成为下一代电池的有希望的候选者。Ruddlesden-Popper钙钛矿氧化物LaSrMnO不仅是一种已知的可进行氟离子嵌入/脱嵌反应的主体材料，而且在用作FIB的阴极材料时表现出高容量和良好的循环性能。然而，为了实际应用，必须进一步改进该化合物中氟离子嵌入/脱嵌的动力学。在本研究中，我们通过系统地改变 LaSrMnO 来控制层间距离以改善氟离子扩散。尽管轴长度随着 的增加单调减小，但层间距离在 = 0.35 处显示最大值。层间距离的扩大抑制了氟离子和氧化物离子之间的库仑排斥，即使在较高的电流密度下也有利于良好的容量保持。