基于电离子COF的聚合物电解质与协同的键网络,用于在全固态金属电池中增强Li+溶解和离子导电性
Jingqiu Liu1, Qingping Wu2, Yaru Wei3
1Department of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China; Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
这项研究介绍了一种用于固态金属电池的新型复合电解质. 这种新材料增强了离子传输和稳定性,使电池性能和寿命更好.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物科学 聚合物科学
背景情况:
- 用于全固态金属电池 (ASSLMBs) 的聚乙烯氧化物 (PEO) 基电解质面临树生长和缓慢离子传输的挑战.
- /电解质接口的差异化学作用阻碍了ASSLMB的高速性能.
研究的目的:
- 开发一种复合电解质,抑制树突的生长,增强Li+运输动力学.
- 提高ASSLMB的界面稳定性和循环性能.
主要方法:
- 在PEO矩阵中整合一个阴离子共价有机框架 (HC-COF) 与键网络.
- 在室温下通过一阶段的imini凝结合成HC-COF.
- 复合电解质的离子导电性,接口性质和电化学性能在对称和全细胞中的表征.
主要成果:
- 该HC-COF@PEO复合电解质表现出增强的Li+导电性 (室温为6.15 × 10-4 S cm-1).
- 在对称的电池中,在450小时内实现了低超电位 (90mV) 的均Li+涂层/脱落.
- 基于LiFePO4的ASSLMB表现出了显著的循环稳定性 (1000个循环在1C) 和卓越的速度性能.
结论:
- 阴离子共价有机框架有效地增强基于PEO的电解质,用于ASSLMBs.
- 开发的HC-COF@PEO复合电解质为实际的ASSLMB提供了有前途的战略,提高了安全性和性能.
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