为高速率和高容量的离子电池扩展捐赠器-接受器共价有机框架的π-结合
Chengqiu Li1, Ao Yu1, WenKai Zhao2
1State Key Laboratory of Explosion Science and Safety Protection, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Angewandte Chemie (International ed. in English)
|August 13, 2024
概括
这项研究引入了一种用于高性能有机电池的新型共价有机框架 (COF). 这种新材料,BTT-PTO-COF,表现出卓越的容量和速率能力,为先进的储能解决方案铺平了道路.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 有机电池需要高速率和高容量的有机电极材料来实现实际应用.
- 现有的有机材料面临着由于导电性差,有限的氧化还原动力学和低功效的挑战.
- 协价有机框架 (COF) 提供了提高电化学性能的潜力.
研究的目的:
- 为高性能有机电池设计和合成一种新的捐赠-接受器共价有机框架 (COF).
- 调查设计的COF材料的电化学性能,包括容量和速率能力.
- 为了证明COF在原型电池设备中的潜力.
主要方法:
- 提供者-接受者COF (BTT-PTO-COF) 的合成,具有扩展的结合,中孔结构和双重氧化还原活性中心.
- 使用以太基和碳酸盐基电解质的半电池中作为阴极材料的BTT-PTO-COF的电化学表征.
- 使用BTT-PTO-COF电极制造和测试全电池 (双离子电池).
- 机制研究包括现场表征和理论计算.
主要成果:
- BTT-PTO-COF阴极表现出高的特异性容量:以218 mAh/g的以太基电解质和275 mAh/g的碳酸盐基电解质在0.2 A/g.
- 实现了出色的速率能力:在50A/g时达到79mAh/g (乙) 和在10A/g时达到124mAh/g (碳酸).
- 使用BTT-PTO-COF的原型双离子电池表现出与半电池相当的性能.
- 机制研究证实了BTT-PTO-COF内部高效的双离子储存和轻松的电荷传输.
结论:
- 开发的BTT-PTO-COF材料显著提高了高速率和高容量的有机电池的电荷转移和多电子过程.
- 这项工作扩大了氧化还原活性COF的范围,并为先进的有机电极材料提供了有价值的设计策略.
- 在实际储能应用中,BTT-PTO-COF非常有前途.
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