全固态转换型锂金属电池用绿色环糊精框架填料增强聚合物电解质

IF 3.3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Huiyan Zha , Xiaoxue Wu , Guyue Li , Jiulin Hu , Keyi Chen , Meng Lei , Yangyang Liu , Zhenzhen Zhou , Jiang Li , Chilin Li
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引用次数: 0

摘要

聚乙烯氧化物(PEO)电解质由于其优异的可操作性和灵活性被认为是全固态锂金属电池的有前途的候选者。然而,它们的实际应用受到低离子电导率和无法有效抑制锂枝晶生长的阻碍。本研究通过将富含羟基的“绿色”环糊精金属有机框架(CD-MOF)纳米颗粒掺入peo基电解质中,成功地开发出了一种环保、高性能的复合电解质。CD-MOF具有良好的孔隙和丰富的羟基,可以与PEO中的环氧乙烷基团和锂盐阴离子形成氢键,抑制PEO的再结晶,促进锂盐的解离,从而提高离子电导率。优化后的复合电解质在60°C下具有4.0 × 10−4 S·cm−1的高离子电导率,电化学窗口扩展至5 V。CD-MOF的引入显著提高了聚合物电解质抑制锂枝晶生长的能力,能够在0.1 mA·cm−2的电流密度下,在60℃下稳定循环2000 h以上。CD-MOF填料的加入大大提高了基于插入阴极和转换阴极的聚合物基锂金属电池的容量和倍率性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Polymer electrolytes reinforced by green cyclodextrin framework filler for all-solid-state conversion-type lithium metal batteries

Polymer electrolytes reinforced by green cyclodextrin framework filler for all-solid-state conversion-type lithium metal batteries
The polyethylene oxide (PEO) based electrolytes are considered as promising candidates for all-solid-state lithium metal batteries due to their excellent operability and flexibility. However, their practical application is hindered by low ionic conductivity and inability to effectively suppress lithium dendrite growth. Here, by incorporating “green” cyclodextrin metal-organic framework (CD-MOF) nanoparticles with rich hydroxyl groups into the PEO-based electrolyte, an environmentally friendly and high-performance composite electrolyte is successfully developed. The well-defined pores and abundant hydroxyl groups in CD-MOF enable the formation of hydrogen bonds with both the ethylene oxide groups in PEO and the lithium salt anions, which suppresses the PEO recrystallization and promotes the lithium salt dissociation, thereby enhancing the ionic conductivity. The optimized composite electrolyte achieves a high ionic conductivity of 4.0 × 10−4 S·cm−1 at 60 °C, along with an expanded electrochemical window up to 5 V. The introduction of CD-MOF significantly improves the ability of polymer electrolyte to suppress lithium dendrite growth, enabling the stable cycling over 2000 h at 60 °C under a current density of 0.1 mA·cm−2. The incorporation of CD-MOF filler greatly enhances the capacity and rate performance of polymer-based lithium metal batteries based on both insertion and conversion cathodes.
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来源期刊
Solid State Ionics
Solid State Ionics 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.10%
发文量
152
审稿时长
58 days
期刊介绍: This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.
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