The lithium-ion transport mechanism in 0.7Li(CB₉H₁₀)–0.3Li(CB₁₁H₁₂) complex hydride solid electrolyte was studied over a wide time-scale (ns–ms) by choosing appropriate techniques for assessing ionic motion on the desired time-scale using nuclear magnetic resonance (NMR) relaxation, AC impedance, and pulsed field gradient-NMR (PFG-NMR) measurements. The ⁷Li NMR line width decreased with increasing temperature, and the spin–lattice relaxation time T₁ for the cation and anions showed a minimum near 303 K, indicating that the lithium ions and the anions were highly mobile. The activation energy estimated from the analysis of the NMR relaxation time matched well with the values estimated from the AC impedance and PFG-NMR. This confirms that the lithium-ion motion in 0.7Li(CB₉H₁₀)–0.3Li(CB₁₁H₁₂) is the same over a wide time-scale, suggesting steady Li-ion motion over a wide transport range. This understanding offers insights into strategies for designing complex hydride lithium superionic conductors.

中文翻译：

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了解不同时间尺度的氯硼酸盐型锂离子导体中的离子动力学

通过选择适当的技术来评估离子运动，在很宽的时间范围（ns-ms）内研究了0.7Li（CB ₉ H ₁₀）–0.3Li（CB ₁₁ H ₁₂ ）复合氢化物固体电解质中的锂离子传输机制。使用核磁共振 (NMR) 弛豫、交流阻抗和脉冲场梯度 NMR (PFG-NMR) 测量来确定所需的时间尺度。⁷ Li NMR线宽随着温度的升高而减小，并且阳离子和阴离子的自旋晶格弛豫时间T ₁在303 K附近显示最小值，表明锂离子和阴离子具有高度的迁移性。通过 NMR 弛豫时间分析估算的活化能与通过 AC 阻抗和 PFG-NMR 估算的值非常匹配。这证实了0.7Li(CB ₉ H ₁₀ )–0.3Li(CB ₁₁ H ₁₂ )中的锂离子运动在很宽的时间范围内是相同的，表明锂离子在很宽的传输范围内运动稳定。这种理解为设计复杂氢化物锂超离子导体的策略提供了见解。