单离子导电聚合物在聚合离子液体嵌段共聚物电解质中作为锂盐添加剂,Journal of Applied Polymer Science

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单离子导电聚合物在聚合离子液体嵌段共聚物电解质中作为锂盐添加剂
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-03-02 , DOI: 10.1002/app.53809
Nicolas Goujon ₁ , Tiago Mendes ₁ , Kristine J. Barlow ₁ , Robert Kerr ₁ , Luke A. O'Dell ₁ , John Chiefari ₂ , Patrick C. Howlett ₁ , Maria Forsyth ₁

Affiliation

在此，我们描述了使用单离子导电嵌段共聚物 (SIC) 作为三元固体聚合物电解质 (SPE) 的附加锂盐添加剂，该电解质由聚 (苯乙烯- b -1-((2-丙烯酰氧基) 乙基)组成)-3-丁基咪唑双(三氟甲磺酰基)亚胺)(S-ImTFSI _64-16 )嵌段共聚物、N-丙基-N-甲基吡咯烷双(氟磺酰基)亚胺(C ₃ mpyrFSI)离子液体(IL)和锂双（氟磺酰基）亚胺 (LiFSI) 盐。为此，S-ImTFSI _64-16被基于聚（苯乙烯-b -（（4-苯乙烯磺酰基）（三氟甲磺酰基）亚胺锂盐））的 SIC 取代（S-STFSILi _64-16), 在不同的摩尔比。通过差示扫描量热法、电化学阻抗谱和扩散 NMR 研究了 SIC 浓度对 SPE 的相行为和传输性能的影响。此外，在 50 和 80°C 的锂对称电池中评估了 SPE 的电化学性能。_{最后，还在 80°C 的 Li│NMC 111}电池中评估了所选 SPE 的循环性能，容量负载为 1.3 mAh.cm ^-2，C 倍率为 0.1 C。Li│NMC ₁₁₁全电池是能够在20次循环后提供0.94 mAh.cm ^-2的稳定容量，对应的容量为117 mAh.g ^-1. 这些结果表明，PIL 嵌段共聚物-IL-盐复合材料代表了下一代固态高能量密度锂金属电池的一种很有前途的电解质选择。

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Single-ion conducting polymer as lithium salt additive in polymerized ionic liquid block copolymer electrolyte

Herein, we describe the use of single-ion conducting block copolymer (SIC) as an additional lithium salt additive to a ternary solid polymer electrolyte (SPE), consisting of a poly(styrene-b-1-((2-acryloyloxy)ethyl)-3-butylimidazolium bis(trifluoromethanesulfo-nyl)imide) (S-ImTFSI_64-16) block copolymer, a N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (C₃mpyrFSI) ionic liquid (IL) and a lithium bis(fluorosulfonyl) imide (LiFSI) salt. For this purpose, the S-ImTFSI_64-16 was substituted by a SIC, based on poly(styrene-b-((4-styrenesulfonyl)(trifluoromethanesulfonyl)imide lithium salt)) (S-STFSILi_64-16), at various molar ratios. The impact of the SIC concentration on the phase behavior and transport properties of the SPEs was investigated by means of differential scanning calorimetry, electrochemical impedance spectroscopy, and diffusion NMR. In addition, the electrochemical performance of the SPEs was assessed in lithium symmetrical cell at 50 and 80°C. Finally, the cycling performance of a selected SPE was also assessed at 80°C in a Li│NMC₁₁₁ cell with capacity loading of 1.3 mAh.cm⁻² at a C-rate of 0.1 C. The Li│NMC₁₁₁ full cell was able to deliver a stable capacity of 0.94 mAh.cm⁻² after 20 cycles, corresponding to a capacity of 117 mAh.g⁻¹. These results demonstrates that PIL block copolymer—IL—salt composites represent a promising choice of electrolyte for the next generation of solid-state high energy density lithium metal batteries.

更新日期：2023-03-02

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