构建捐赠器-接受器链接的COF电解质以调节电子密度并加速近固态电池中的Li+迁移
Genfu Zhao1, Hang Ma2, Conghui Zhang1
1School of Materials and Energy, International Joint Research Center for Advanced Energy Materials of Yunnan Province, Yunnan University, Kunming, 650091, People's Republic of China.
Nano-micro letters
|September 26, 2024
概括
本研究介绍了与捐赠者-接受者相关的共价有机框架 (COF) 作为高性能金属电池的新型固态电解质. 这些COF增强了离子 (Li+) 运输和树枝状物抑制,改善了电池的稳定性和寿命.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 固态电解质对于先进的金属电池至关重要.
- 控制电解质中的电子密度是选择性离子传输的关键.
- 捐赠者-接受者 (D-A) 系统提供了一个调节电子属性的途径.
研究的目的:
- 开发一种高性能固态电解质,使用D-A连接的共价有机框架 (COF).
- 研究分子内电荷转移和电子密度调制在Li+运输中的作用.
- 为了增强Li+迁移的选择性,并抑制树状石的形成.
主要方法:
- 合成D-A相关的COF,重点是基于F的配体.
- 对COF结构和电子属性的表征.
- 在Li金属对称和Li/LiFePO4电池中对固态电解质进行电化学测试.
主要成果:
- 基于F的联体COF电解质显示出高度选择性的Li+转移数 (0.83).
- 实现了6.7 × 10-4 S cm-1的高离子导电性和出色的周期稳定性 (1000 h).
- 与C和N基联体相比,在Li/LiFePO4细胞中性能优异,在5C下300个周期后容量保留90.8%,与C和N基联体相比.
结论:
- 与DA相关的COF有效调节电子密度,以增强Li+动力学.
- 氨酸供体和基于F的受体之间的强大的D-A相互作用加快了Li+导电.
- 这种方法为设计用于金属电池的高性能固态电解质提供了新的策略.
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