将多个氧活性单元集成到高性能离子电池的导电共价有机框架中
1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.
Angewandte Chemie (International ed. in English)
|September 18, 2024
概括
新的多孔共价有机框架 (COFs) 具有增强的导电性和氧化还原活性,对离子电池 (SIBs) 显示出前景. FPDC-TPT-COF具有高容量和稳定性,性能优于现有的基于COF的阳极.
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:
- 高性能离子电池 (SIB) 需要先进的电极材料,具有更好的导电性和氧化还原活性.
- 联有机框架 (COF) 提供可调节的结构,但在SIB应用中经常面临导电性方面的挑战.
研究的目的:
- 为SIB阳极合理设计和合成具有增强导电性和可逆氧化还原活性的新型多孔COF.
- 调查这些COF的结构-财产关系及其在SIB中的表现.
主要方法:
- 一系列COF (FPDC-TPA-COF,FPDC-TPB-COF,FPDC-TPT-COF) 的合成使用有机硫链接器 (FPDC).
- 对COF结构,多孔性和导电性的表征.
- 在SIB中作为阳极的COF的电化学测试,包括容量,循环稳定性和速率性能.
- 在现场实验和密度函数理论 (DFT) 计算以阐明化机制.
主要成果:
- 合成的COF具有2D晶体结构,高孔度和良好的导电性.
- FPDC-TPT-COF实现了高特异性容量 (420mAhg-1在0.2Ag-1),卓越的循环稳定性 (在3000个循环后保持~87%) 和高速率性能 (339mAhg-1在2.0Ag-1).
- 性能归因于导电性和氧化还原活性位点 (碳,胺,三) 的二硫醇部分,用于储存.
结论:
- 开发的基于有机硫的COF是SIB的高效阳极,超过了许多现有的COF材料.
- 将多个功能组集成到氧化还原活性COF中,是设计高效和稳定的SIB的可行策略.
- 该研究提供了对化机制的见解,有助于未来的离子储能材料的材料开发.
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