{"title":"水性聚氨酯胶束强化了用于金属锂电池的 PEO 电解质","authors":"Zhen Shi, Hongru Zhou, Zixin Fan, Kairui Guo, Hui Nie, Xingping Zhou, Zhigang Xue","doi":"10.1002/smll.202407293","DOIUrl":null,"url":null,"abstract":"Although solid polymer electrolytes have been developed for several decades, poly(ethylene oxide) (PEO) or polymers with ethoxy (EO) segments are still one of the most promising candidates for advanced batteries. The low ionic conductivity and lithium-ion transference number as well as the deterioration of mechanical properties after coupling with lithium salts restrict its further adoption. Herein, a serial of PEO-based composite electrolytes optimized by waterborne polyurethane are prepared via blend method. With the assistance of H<sub>2</sub>O, ionic type waterborne polyurethane assembles into flexible micelles, in which hydrophobic segments as the core and hydrophilic groups as the shell. Utilizing this feature of waterborne polyurethane, PEO and Li salt (LiTFSI) aqueous solution is slowly added to the organic solution of waterborne polyurethane to compound in situ, and polymer composite electrolytes are fabricated. The multilevel (hydrogen bonds with different binding energy) and multiscale (deformation of flexible micelles) dynamic interaction endows the composite electrolyte with attractive mechanical properties. The assembled Li|Li symmetric battery with the molar ratio of EO to Li salts of 8:1 exhibits excellent cycling stability up to 800 h at 0.1 mA cm<sup>−2</sup>, and the assembled Li|LiFePO<sub>4</sub> battery can be stably cycled at 1C for >400 cycles.","PeriodicalId":228,"journal":{"name":"Small","volume":null,"pages":null},"PeriodicalIF":13.0000,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Waterborne Polyurethane Micelles Reinforce PEO-Based Electrolytes for Lithium Metal Batteries\",\"authors\":\"Zhen Shi, Hongru Zhou, Zixin Fan, Kairui Guo, Hui Nie, Xingping Zhou, Zhigang Xue\",\"doi\":\"10.1002/smll.202407293\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Although solid polymer electrolytes have been developed for several decades, poly(ethylene oxide) (PEO) or polymers with ethoxy (EO) segments are still one of the most promising candidates for advanced batteries. The low ionic conductivity and lithium-ion transference number as well as the deterioration of mechanical properties after coupling with lithium salts restrict its further adoption. Herein, a serial of PEO-based composite electrolytes optimized by waterborne polyurethane are prepared via blend method. With the assistance of H<sub>2</sub>O, ionic type waterborne polyurethane assembles into flexible micelles, in which hydrophobic segments as the core and hydrophilic groups as the shell. Utilizing this feature of waterborne polyurethane, PEO and Li salt (LiTFSI) aqueous solution is slowly added to the organic solution of waterborne polyurethane to compound in situ, and polymer composite electrolytes are fabricated. The multilevel (hydrogen bonds with different binding energy) and multiscale (deformation of flexible micelles) dynamic interaction endows the composite electrolyte with attractive mechanical properties. The assembled Li|Li symmetric battery with the molar ratio of EO to Li salts of 8:1 exhibits excellent cycling stability up to 800 h at 0.1 mA cm<sup>−2</sup>, and the assembled Li|LiFePO<sub>4</sub> battery can be stably cycled at 1C for >400 cycles.\",\"PeriodicalId\":228,\"journal\":{\"name\":\"Small\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":13.0000,\"publicationDate\":\"2024-10-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Small\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1002/smll.202407293\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Small","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/smll.202407293","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
尽管固体聚合物电解质已经开发了几十年,但聚环氧乙烷(PEO)或带有乙氧基(EO)段的聚合物仍然是最有希望用于先进电池的候选材料之一。但其离子电导率和锂离子转移率较低,而且与锂盐偶联后机械性能会下降,这些都限制了其进一步应用。本文通过混合法制备了一系列由水性聚氨酯优化的 PEO 基复合电解质。在 H2O 的帮助下,离子型水性聚氨酯组装成柔性胶束,其中疏水片段为核心,亲水基团为外壳。利用水性聚氨酯的这一特点,在水性聚氨酯的有机溶液中缓慢加入 PEO 和锂盐(LiTFSI)水溶液,使其在原位复合,制成聚合物复合电解质。多级(具有不同结合能的氢键)和多尺度(柔性胶束变形)动态相互作用赋予了复合电解质极具吸引力的机械性能。EO与锂盐的摩尔比为8:1的组装锂锂对称电池在0.1 mA cm-2条件下具有长达800 h的优异循环稳定性,组装的锂铁锂电池可在1C条件下稳定循环400次。
Waterborne Polyurethane Micelles Reinforce PEO-Based Electrolytes for Lithium Metal Batteries
Although solid polymer electrolytes have been developed for several decades, poly(ethylene oxide) (PEO) or polymers with ethoxy (EO) segments are still one of the most promising candidates for advanced batteries. The low ionic conductivity and lithium-ion transference number as well as the deterioration of mechanical properties after coupling with lithium salts restrict its further adoption. Herein, a serial of PEO-based composite electrolytes optimized by waterborne polyurethane are prepared via blend method. With the assistance of H2O, ionic type waterborne polyurethane assembles into flexible micelles, in which hydrophobic segments as the core and hydrophilic groups as the shell. Utilizing this feature of waterborne polyurethane, PEO and Li salt (LiTFSI) aqueous solution is slowly added to the organic solution of waterborne polyurethane to compound in situ, and polymer composite electrolytes are fabricated. The multilevel (hydrogen bonds with different binding energy) and multiscale (deformation of flexible micelles) dynamic interaction endows the composite electrolyte with attractive mechanical properties. The assembled Li|Li symmetric battery with the molar ratio of EO to Li salts of 8:1 exhibits excellent cycling stability up to 800 h at 0.1 mA cm−2, and the assembled Li|LiFePO4 battery can be stably cycled at 1C for >400 cycles.
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
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