Mobility and number density of charge carriers are important parameters that influence the electrolyte conductivity. Therefore, knowing these parameters quantitatively is of great significance. In this work, solid polymer electrolytes have been prepared by solution casting technique using gellan gum complexes with lithium triflate (LiTf). The conductivity of the electrolyte increases from 3.35 × 10−8 S cm−1 (electrolyte with 10 wt% LiTf) to 5.38 × 10−4 S cm−1 (electrolyte with 40 wt% LiTf). The increase in conductivity was attributed to the increase in mobility and number density of charge carriers in the electrolyte from 6.63 × 10−9 cm2 V−1 s−1 to 1.25 × 10−6 cm2 V−1 s−1 and from 4.00 × 1020 cm−3 to 2.68 × 1021 cm−3, respectively. The electrolyte conductivity is seen to decrease as LiTf salts were added more than 40 wt% concentration due to the decrease of charge carrier mobility to 8.58 × 10−7 cm2 V−1 s−1. The variation of conductivity obtained in this work is dominantly influenced by the mobility of charge carriers in the electrolyte as proven from the Fourier transform infrared approach.

中文翻译：

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振动光谱法测定结冷胶-三氟甲磺酸锂固体聚合物电解质的载流子传输特性

电荷载流子的迁移率和数量密度是影响电解质电导率的重要参数。因此，定量地了解这些参数具有重要意义。在这项工作中，使用结冷胶与三氟甲磺酸锂 (LiTf) 的复合物通过溶液浇铸技术制备了固体聚合物电解质。电解质的电导率从 3.35 × 10-8 S cm-1（含 10 wt% LiTf 的电解质）增加到 5.38 × 10-4 S cm-1（含 40 wt% LiTf 的电解质）。电导率的增加归因于电解质中电荷载流子的迁移率和数量密度从 6.63 × 10−9 cm2 V−1 s−1 增加到 1.25 × 10−6 cm2 V−1 s−1 和从 4.00 ×分别为 1020 cm-3 至 2.68 × 1021 cm-3。由于电荷载流子迁移率降低至 8.58 × 10-7 cm2 V-1 s-1，当 LiTf 盐的添加浓度超过 40 wt% 时，可以看到电解质电导率降低。正如傅里叶变换红外方法所证明的那样，在这项工作中获得的电导率的变化主要受电解质中电荷载流子迁移率的影响。