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Lithium ion capacitor based on polyoxide-polythiol co-networks
Solid State Ionics ( IF 3.0 ) Pub Date : 2022-09-13 , DOI: 10.1016/j.ssi.2022.116010
Suresh Narute , Thein Kyu

The present article emerges from our recent finding of supercapacitive behavior of polymer electrolyte membranes (PEM) via photo-crosslinking of polyethylene glycol diacrylate (PEGDA) with trimethylolpropane tris(3-mercaptopropionate) (TMPTMP) via thiol-ene click reaction in the presence of succinonitrile (SCN) plasticizer and lithium bis(trifluoromethane sulfonyl imide) (LiTFSI) salt. The photo-cured polymer electrolyte membrane (PEM) co-network revealed a superionic conductor level of 1.26 mS/cm at 23 °C and an elongation at break of around 23%, suggestive of a highly conductive and stretchable character. Upon deep discharging to the potential range of lithium metal anode at −0.5–0.5 V, lithium-ion stripping from the Li metal electrode (i.e, oxidation at 0–0.3 V) affords continuous supply of Li-ions, which not only afford the lithium-ion storage within the PEM through ion-dipole interaction (i.e., temporary holding of Li ions), but also facile ion transport once the complexation sites of Li-ion with ether oxygen and thiols are fully saturated with excess Li-ions. To elucidate a plausible energy storing mechanism of the PEM, the cyclic voltammetry (CV) investigation was performed in the full battery configuration as well as in the symmetric carbonaceous electrode configuration. A novel supercapacitor behavior was noticed in the PEM involving both pseudocapacitor and electric double-layer capacitor (EDLC) types. Last but not least, specific capacitance and specific energy densities from the CV curves were evaluated and discussed.



中文翻译:

基于多氧化物-多硫醇共网络的锂离子电容器

本文源于我们最近发现的聚合物电解质膜 (PEM) 的超级电容行为,即聚乙二醇二丙烯酸酯 (PEGDA) 与三羟甲基丙烷三(3-巯基丙酸酯) (TMPTMP) 通过硫醇-烯点击反应光交联。丁二腈 (SCN) 增塑剂和双(三氟甲磺酰亚胺)锂 (LiTFSI) 盐。光固化聚合物电解质膜 (PEM) 共网络在 23 °C 下显示出 1.26 mS/cm 的超离子导体水平和约 23% 的断裂伸长率,表明具有高导电性和可拉伸特性。在-0.5-0.5 V深度放电到锂金属负极的电位范围后,锂离子从锂金属电极剥离(即在0-0.3 V氧化)提供锂离子的持续供应,它不仅通过离子-偶极相互作用(即暂时保持锂离子)在 PEM 中提供锂离子存储,而且一旦锂离子与醚氧和硫醇的络合位点完全饱和,离子传输也很容易。锂离子。为了阐明 PEM 的合理储能机制,在全电池配置和对称碳质电极配置中进行了循环伏安法 (CV) 研究。在 PEM 中发现了一种新的超级电容器行为,涉及赝电容器和双电层电容器 (EDLC) 类型。最后但同样重要的是,评估和讨论了来自 CV 曲线的比电容和比能量密度。一旦锂离子与醚氧和硫醇的络合位点被过量的锂离子完全饱和,离子传输也很容易。为了阐明 PEM 的合理储能机制,在全电池配置和对称碳质电极配置中进行了循环伏安法 (CV) 研究。在 PEM 中发现了一种新的超级电容器行为,涉及赝电容器和双电层电容器 (EDLC) 类型。最后但同样重要的是,评估和讨论了来自 CV 曲线的比电容和比能量密度。一旦锂离子与醚氧和硫醇的络合位点被过量的锂离子完全饱和,离子传输也很容易。为了阐明 PEM 的合理储能机制,在全电池配置和对称碳质电极配置中进行了循环伏安法 (CV) 研究。在 PEM 中发现了一种新的超级电容器行为,涉及赝电容器和双电层电容器 (EDLC) 类型。最后但同样重要的是,评估和讨论了来自 CV 曲线的比电容和比能量密度。循环伏安法 (CV) 研究在全电池配置以及对称碳质电极配置中进行。在 PEM 中发现了一种新的超级电容器行为,涉及赝电容器和双电层电容器 (EDLC) 类型。最后但同样重要的是,评估和讨论了来自 CV 曲线的比电容和比能量密度。循环伏安法 (CV) 研究在全电池配置以及对称碳质电极配置中进行。在 PEM 中发现了一种新的超级电容器行为,涉及赝电容器和双电层电容器 (EDLC) 类型。最后但同样重要的是,评估和讨论了来自 CV 曲线的比电容和比能量密度。

更新日期:2022-09-14
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