作为高性能离子电池的双活性中心阴极的高晶聚合物共价有机框架
Liyi Yao1, Chao Ma2,3, Libo Sun4
1State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
Journal of the American Chemical Society
|December 13, 2022
概括
这项研究引入了具有双活性位点的聚胺共价有机框架 (PI-COF) 的新型水辅助合成. 这些先进的PI-COF具有很大的表面积,并且作为可充电离子电池的正极材料具有很好的性能.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 聚胺共价有机框架 (PI-COF) 是可充电器件的有希望的电极材料,因为它们具有内在的氧化还原能力.
- 合成具有等级多孔性的高晶度PI-COF的挑战阻碍了它们的应用.
- 现有的聚化反应通常具有快速的动力学和不良的可逆性.
研究的目的:
- 开发一种以水为辅助的合成策略,用于生产具有层次孔隙性的高晶度PI-COF.
- 合成一种具有双活性中心的新型PI-COF (COFTPDA-PMDA),以提高电化学性能.
- 评估COFTPDA-PMDA作为离子电池的正极材料的潜力.
主要方法:
- 使用水辅助合成策略来控制聚化反应速率.
- 高晶度PI-COF (COFTPDA-PMDA) 是使用N,N,N',N'-tetrakis(4-aminophenyl)-1,4-benzenediamine (TPDA) 和 pyromellitic dianhydride (PMDA) 配体进行合成的.
- COFTPDA-PMDA与碳纳米管 (CNT) 通过π-π相互作用组成了COFTPDA-PMDA@50%CNT.
主要成果:
- 合成的COFTPDA-PMDA具有很高的表面积 (2669 m2/g) 和层次的微/半孔结构.
- 该物质表明+和TFSI- 离子与双重活性位点之间的有效相互作用.
- COFTPDA-PMDA@50%CNT在0.5A/g时产生了233mAh/g的高初始充电容量,并在1800次循环后在5.0A/g时保持了80mAh/g.
结论:
- 这种水辅助合成有效地产生具有可取的多孔性的高晶度PI-COF.
- 作为离子电池的高性能阴极材料,COFTPDA-PMDA具有显著的潜力.
- 与CNT的集成增强了PI-COF材料的电化学稳定性和容量保留.
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