曲率缺陷工程向离子电池中基于COF的高性能阴极发展
Ju Duan1, Haojie Zhou1, Wenxiao Bi1
1State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University Shanghai 201620 China wlyu@dhu.edu.cn yzliao@dhu.edu.cn.
与碳纳米管 (CNT) 集成的富有缺陷的共价有机框架 (COF) 通过改善离子和电子传输来提高电池性能. 这种新的阴极设计增强了电化学动力学,为卓越的能量存储能力和寿命提供了优势.
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
- 纳米技术纳米技术
背景情况:
- 联有机框架 (COF) 是可充电电池的有希望的多孔材料,因为它们的可调节结构.
- 目前COF的局限性包括电子运输和离子扩散差,阻碍了充分利用活性站点.
- 提高电化学反应动力学对于高性能的基于COF的能量存储至关重要.
研究的目的:
- 使用曲率缺陷工程设计一个富有缺陷的COF@CNT阴极.
- 改进基于COF的阴极的电化学反应动力学.
- 提高使用COF材料的可充电电池的整体性能.
主要方法:
- 使用曲率缺陷工程来创建富有缺陷的COF@CNT结构.
- 研究了充满缺陷的框架和CNT网络的协同效应.
- 评估了电化学性质,包括导电性,离子扩散,反应速率,特定容量和循环稳定性.
主要成果:
- RBT-COF@CNT-50阴极表现出增强的电子导电性 (2.65 × 10-4 S m-1) 和更快的离子扩散.
- 由于缺陷装饰,实现了更高的反应速率 (1.22 × 10-6 mol s-1 m-2).
- 该材料提供了高的特异性容量 (302mAhg-1在0.1Ag-1) 和优秀的长期循环稳定性 (124mAg-1在10Ag-1在0.004%衰减/循环).
结论:
- 通过曲率效应设计的富有缺陷的COF@CNT阴极显著提高了电化学动力学.
- 该策略有效地克服了COF材料中电子传输和离子扩散的局限性.
- 这种方法为开发高级可充电电池的基于COF的高性能阴极提供了一条途径.
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