LAGP (Li_1.5Al_0.5Ge_1.5(PO₄)₃) is one of inorganic solid electrolytes (ISEs) and is relatively stable against atmospheric CO₂ and H₂O. Five LAGP pellet samples with thicknesses ranging from 0.5 to 4 mm (10⁻³ m) were investigated by pulsed field gradient (PFG) ⁷Li NMR spectroscopy. PFG was applied in the thickness direction and the Li diffusion in the same direction was observed. The apparent diffusion coefficients (D_apparent) of Li were determined over the observation time (Δ) ranging from 5 to 100 × 10⁻³ s and the distances from 0.1 to 1 × 10⁻⁶ m. The D_apparent of LAGP samples was 10⁻¹¹ to 10⁻¹³ m²s⁻¹ at 28 °C. The results showed that the Li diffusion phenomenon was thickness dependent. When Δ was short, diffusion of Li was slower for thinner samples, suggesting that the Li pathway was made to avoid surface boundaries. The Li ions were found to diffuse through preferential and longer paths of the pellet samples. As Δ became longer, the diffusion process of Li averaged out and the diffusion coefficient converged to a constant value regardless of the thickness. The PFG-NMR observes a diffusion coefficient of ⁷Li species which are marked by the first PFG and detected by the second PFG after Δ. Impedance spectroscopy, on the other hand, measures the ionic conductivity for continuous charge transfer between electrodes under electric field, and higher ionic conductivities have been reported for thinner samples.

LAGP (Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ ) 是无机固体电解质 (ISE) 的一种，对大气 CO ₂和 H ₂ O 相对稳定。五个厚度范围为 0.5 至 4 mm (10 ^-3  m) 通过脉冲场梯度 (PFG) ⁷ Li NMR 光谱进行研究。沿厚度方向施加PFG，并观察到沿相同方向的Li扩散。Li的表观扩散系数 ( D_{表观) 在 5 到 100 × 10} ^-3 s的观察时间 (Δ) 和 0.1 到 1 × 10 的距离内确定^-6 米。LAGP样品的D_表观在28℃为10 ^-11至10 ^-13 m ² s ^{-1 。}结果表明，锂扩散现象与厚度有关。当 Δ 短时，对于较薄的样品，Li 的扩散较慢，这表明 Li 通路是为了避免表面边界。发现锂离子通过颗粒样品的优先路径和更长的路径扩散。随着 Δ 变长，Li 的扩散过程平均化，扩散系数收敛到一个恒定值，而与厚度无关。PFG-NMR 观察到扩散系数为⁷由第一个 PFG 标记并在 Δ 之后由第二个 PFG 检测到的 Li 物种。另一方面，阻抗谱测量在电场下电极之间连续电荷转移的离子电导率，据报道，较薄的样品具有更高的离子电导率。