Novel dopamine-containing gel polymer electrolytes for Li-organic batteries

IF 4.6 Q2 CHEMISTRY, PHYSICAL

Journal of Power Sources Advances Pub Date : 2025-08-30 DOI:10.1016/j.powera.2025.100186

Öykü Simsek , Alessandro Innocenti , Isaac Álvarez Moisés , Philip Zimmer , Ziyuan Lyu , Simon Muench , Jean-François Gohy , Dominic Bresser , Ulrich S. Schubert

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Abstract

We present a new gel polymer electrolyte (GPE) based on a dopamine-containing comonomer for lithium-organic battery cells. First, several liquid electrolyte solutions composed of an ionic liquid and a lithium salt were prepared and tested in Li-organic cells with poly(2,2,6,6-tetramethyl-1-piperidinyloxy-4-yl methacrylate) (PTMA) as the positive electrode active material to evaluate the compatibility. Among them, ionic liquid electrolyte (ILE) (1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIMFSI):lithium bis(fluorosulfonyl)imide (LiFSI), 0.8:0.2, mol:mol) was found to lead to the highest specific capacity (63.5 mAh g⁻¹ at 1C). The polymer matrix composed of benzyl methacrylate (BnMA), poly(ethylene glycol) methyl ether methacrylate (mPEGMA), and dopamine methacrylamide (DMAAm) was synthesized by UV-polymerization. A literature-known polymer system without DMAAm was prepared for comparison. Samples from both polymer films were immersed in the ILE to obtain GPEs. It was found that the addition of DMAAm increased the electrolyte uptake significantly. GPEs comprising DMAAm reveal high ionic conductivity (2.3 mS cm⁻¹ at 20 °C) and improved galvanostatic cycling performance in Li//PTMA cells compared to the GPEs without DMAAm.

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有机锂电池用新型含多巴胺凝胶聚合物电解质

我们提出了一种基于含多巴胺单体的新型有机锂电池凝胶聚合物电解质（GPE）。首先，制备了几种由离子液体和锂盐组成的液体电解质溶液，并在以聚（2,2,6,6-四甲基-1-胡椒酰氧基-4-甲基丙烯酸酯）（PTMA）为正极活性材料的锂有机电池中进行了测试，以评价其相容性。其中，离子液体电解质（ILE）（1-乙基-3-甲基咪唑双（氟磺酰基）亚胺（EMIMFSI）：锂双（氟磺酰基）亚胺（LiFSI）， 0.8:0.2, mol:mol）的比容量最高（1C时为63.5 mAh g−1）。采用紫外聚合法制备了由甲基丙烯酸苄酯（BnMA）、聚乙二醇甲基丙烯酸甲醚（mPEGMA）和多巴胺甲基丙烯酸酰胺（DMAAm）组成的聚合物基体。制备了一种文献已知的不含DMAAm的聚合物体系进行比较。将两种聚合物薄膜的样品浸泡在ILE中以获得GPEs。结果表明，DMAAm的加入显著增加了电解质的摄取。与不含DMAAm的gpe相比，含有DMAAm的gpe在Li//PTMA电池中具有较高的离子电导率（20°C时为2.3 mS cm−1）和更好的恒流循环性能。

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