In order to assess the ion transport properties of alternative non‐flammable electrolytes in a typical commercial Li‐ion battery cell, we have measured the ionic conductivity and the lithium‐ion transference number under anion‐blocking conditions, , for two classes of highly concentrated battery electrolytes: (i) Mixtures of the ionic liquid N‐methyl‐N‐propyl‐pyrrolidinium bis(fluorosulfonyl)imide (Pyr₁₃FSI) with different amounts of the lithium bis(fluorosulfonyl)imide (LiFSI), and (ii) a solvate ionic liquid consisting of an equimolar mixture of tetraglyme (G4) and LiFSI. Together with previously published data on the solvate ionic liquid G4/LiTFSI (1 : 1), the obtained Li⁺ ion transport data was used to estimate the overall resistance and the resulting maximum cycling rate of a commercial 10 Ah Li‐ion pouch cell containing these alternative electrolytes. Our results suggest that Pyr₁₃FSI/LiFSI mixtures would allow for maximum charging/discharging rates close to 1 C, while the solvate ionic liquids would only support maximum rates of about 0.3 C.

中文翻译：

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评估商用锂离子电池中高浓度非易燃电解质的离子输运特性

为了评估典型的商用锂离子电池中其他非易燃电解质的离子传输特性，我们测量了阴离子阻挡条件下 两类高度浓缩的离子的电导率和锂离子迁移数电池电解质：（i）离子液体N-甲基-N-丙基-吡咯烷鎓双（氟磺酰基）酰亚胺（Pyr ₁₃ FSI）与不同量的双（氟磺酰基）酰亚胺锂（LiFSI）的混合物，和（ii）a由四甘醇二甲醚（G4）和LiFSI等摩尔混合物组成的溶剂化物离子液体。连同先前发布的有关溶剂化物离子液体G4 / LiTFSI（1：1）的数据，所得Li ⁺离子传输数据用于估算包含这些替代电解质的商用10 Ah锂离子袋式电池的整体电阻和由此产生的最大循环速率。我们的结果表明，Pyr ₁₃ FSI / LiFSI混合物将允许最大充电/放电速率接近1 C，而溶剂化物离子液体仅支持约0.3 C的最大速率。