{"title":"Polyacrylonitrile Nanofiber-Reinforced Flexible Single-Ion Conducting Polymer Electrolyte for High-Performance, Room-Temperature All-Solid-State Li-Metal Batteries","authors":"Hui Cheng, Chaoyi Yan, Raphael Orenstein, Mahmut Dirican, Shuzhen Wei, Nakarin Subjalearndee, Xiangwu Zhang","doi":"10.1007/s42765-021-00128-1","DOIUrl":null,"url":null,"abstract":"<div><p>Single-ion conducting polymer electrolytes (SIPEs) can be formed by anchoring charge delocalized anions on the side chains of a crosslinked polymer matrix, thereby eliminating the severe concentration polarization effect in conventional dual-ion polymer electrolytes. Addition of a plasticizer into the polymer matrix confers advantages of both liquid and solid electrolytes. However, plasticized SIPEs usually face a trade-off between conductivity and mechanical strength. With insufficient strength, potentially there is short-circuiting failure during cycling. To address this challenge, a simple and mechanically-robust SIPE was developed by crosslinking monomer lithium (4-styrenesulfonyl) (trifluoromethylsulfonyl) imide (LiSTFSI) and crosslinker poly(ethylene glycol) diacrylate (PEGDA), with plasticizer propylene carbonate (PC), on electrospun polyacrylonitrile nanofibers (PAN-NFs). The well-fabricated polymer matrix provided fast and effective Li<sup>+</sup> conductive pathways with a remarkable ionic conductivity of 8.09 × 10<sup>–4</sup> S cm<sup>−1</sup> and a superior lithium-ion transference number close to unity (<i>t</i><sub><i>Li</i>+</sub> = 0.92). The introduction of PAN-NFs not only improved the mechanical strength and flexibility but also endowed the plasticized SIPE with a wide electrochemical stability window (4.9 V vs. Li<sup>+</sup>/Li) and better cycling stability. Superior long-term lithium cycling stability and dynamic interfacial compatibility were demonstrated by lithium symmetric cell testing. Most importantly, the assembled all-solid-state Li metal batteries showed stable cycling performance and remarkable rate capability both in low and high current densities. Therefore, this straightforward and mechanically reinforced SIPE exhibits great potential in the development of advanced all-solid-state Li-metal batteries.</p><h3>Graphical abstract</h3>\n <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\n </div>","PeriodicalId":459,"journal":{"name":"Advanced Fiber Materials","volume":"4 3","pages":"532 - 546"},"PeriodicalIF":17.2000,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"17","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Fiber Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s42765-021-00128-1","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 17
Abstract
Single-ion conducting polymer electrolytes (SIPEs) can be formed by anchoring charge delocalized anions on the side chains of a crosslinked polymer matrix, thereby eliminating the severe concentration polarization effect in conventional dual-ion polymer electrolytes. Addition of a plasticizer into the polymer matrix confers advantages of both liquid and solid electrolytes. However, plasticized SIPEs usually face a trade-off between conductivity and mechanical strength. With insufficient strength, potentially there is short-circuiting failure during cycling. To address this challenge, a simple and mechanically-robust SIPE was developed by crosslinking monomer lithium (4-styrenesulfonyl) (trifluoromethylsulfonyl) imide (LiSTFSI) and crosslinker poly(ethylene glycol) diacrylate (PEGDA), with plasticizer propylene carbonate (PC), on electrospun polyacrylonitrile nanofibers (PAN-NFs). The well-fabricated polymer matrix provided fast and effective Li+ conductive pathways with a remarkable ionic conductivity of 8.09 × 10–4 S cm−1 and a superior lithium-ion transference number close to unity (tLi+ = 0.92). The introduction of PAN-NFs not only improved the mechanical strength and flexibility but also endowed the plasticized SIPE with a wide electrochemical stability window (4.9 V vs. Li+/Li) and better cycling stability. Superior long-term lithium cycling stability and dynamic interfacial compatibility were demonstrated by lithium symmetric cell testing. Most importantly, the assembled all-solid-state Li metal batteries showed stable cycling performance and remarkable rate capability both in low and high current densities. Therefore, this straightforward and mechanically reinforced SIPE exhibits great potential in the development of advanced all-solid-state Li-metal batteries.
单离子导电聚合物电解质(SIPEs)可以通过将电荷离域阴离子锚定在交联聚合物基体的侧链上形成,从而消除了传统双离子聚合物电解质中严重的浓度极化效应。在聚合物基体中加入增塑剂可同时获得液体和固体电解质的优点。然而,塑化sipe通常面临电导率和机械强度之间的权衡。如果强度不足,在循环过程中可能会出现短路故障。为了解决这一挑战,研究人员将单体锂(4-苯乙烯磺酰)(三氟甲基磺酰)亚胺(LiSTFSI)和交联剂聚乙二醇二丙烯酸酯(PEGDA)与增塑剂碳酸丙烯酯(PC)在静电纺聚丙烯腈纳米纤维(PAN-NFs)上交联,开发了一种简单且机械坚固的SIPE。制备良好的聚合物基质提供了快速有效的Li+导电途径,离子电导率为8.09 × 10-4 S cm−1,锂离子转移数接近1 (tLi+ = 0.92)。PAN-NFs的引入不仅提高了SIPE的机械强度和柔韧性,而且使其具有更宽的电化学稳定窗口(4.9 V vs. Li+/Li)和更好的循环稳定性。锂对称电池测试表明,该材料具有良好的长期锂循环稳定性和动态界面相容性。最重要的是,组装的全固态锂金属电池在低电流密度和高电流密度下都表现出稳定的循环性能和显著的倍率能力。因此,这种简单的机械增强SIPE在先进的全固态锂金属电池的发展中显示出巨大的潜力。图形抽象
期刊介绍:
Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al.
Publishing on fiber or fiber-related materials, technology, engineering and application.