混合离子-电子导电增加了聚纳甲二胺的能量储存速度能力
Yilin Li1, Sohee Park2, Kasturi Sarang3
1Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States.
ACS polymers Au
|June 19, 2023
概括
研究人员开发了新的联聚合物电极,通过添加oligo ((乙烯基醇) 侧链. 这些增强的聚合物电极表现出超快速充电和卓越的稳定性,用于先进的电池应用.
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
- 聚合物化学 聚合物化学
背景情况:
- 结合聚合物对电池电极来说是有前途的,因为它能进行电子传输.
- 提高这些电极的离子导电性对于速率性能至关重要.
- 目前用于增强聚合物电极中的离子运输的策略有限.
研究的目的:
- 为了研究结合的多纳普他林二氧化物 (PNDI) 聚合物与oligo(乙烯糖醇) (EG) 侧链.
- 了解不同的EG侧链含量如何影响电池电极性能.
- 开发用于储能的高速,稳定的聚合物电极.
主要方法:
- 合成的PNDI聚合物具有不同比例的化和糖化侧链.
- 使用电荷-放电循环,电化学阻抗光谱和循环电压测量来评估电极性能.
- 描述了EG侧链对离子和电子导电性的影响.
主要成果:
- 整合EG侧链显著改善了速率性能,达到500C (每周期14.4秒).
- 电极通过厚度 (20微米) 和高聚合物含量 (80重量%) 的配置保持了高性能.
- 具有≥90%EG侧链的PNDI聚合物作为有效的无碳电极起作用.
- 随着EG侧链的结合,观察到增强的离子和电子导电性.
结论:
- 奥利戈 ((乙烯基醇) 侧链在联聚合物电极中有效提高离子导电性.
- 这些修改后的PNDI聚合物显示出超快充和稳定的电池应用的潜力.
- 具有联合离子和电子导电的聚合物为先进的储能解决方案提供了一条途径.
相关概念视频
01:28Ionic Association
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...