刚性-灵活的烯基块共聚合物/多壁碳纳米管,通过扩展的π-结合来提高阳极性能
Xin Zeng1, Haiying Nie1,2, Jian Li1,2,3
1College of Material Science and Engineering, Central South University, Changsha, Hunan, 410000, China.
ChemSusChem
|September 30, 2025
概括
这项研究介绍了一种新型的烯/丁烯块共聚合物复合物,用于先进电池阳极的多壁碳纳米管. 新设计显著提高了储能能力和稳定性,克服了传统聚烯阳极的局限性.
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
- 聚合物科学 聚合物科学
背景情况:
- 聚乙烯是电池的有前途的阳极材料,具有高理论容量,快速的氧化还原动力学和低电压.
- 关键的挑战包括由于电导率低而导致容量退化,以及由于聚合物纠而阻碍离子运输.
研究的目的:
- 设计和合成一种新型的烯/丁烯 (TH/BT) 块共聚合物复合物,与多壁碳纳米管 (MWCNTs) 集成.
- 通过解决导电性和离子间问题,提高基于聚烯的阳极的电化学性能.
主要方法:
- 使用硫 (TH) 和丁 (BT) 块开发一种刚性-灵活的块共聚合物结构.
- 集成块共聚合物与多壁碳纳米管 (MWCNTs) 形成一个3D电子传输网络.
- 优化TH:BT比率以实现结晶性和可溶性之间的平衡,从而产生Cob{3:1}-TH+BT@CNT.
主要成果:
- 该Cob(3:1) -TH+BT@CNT阳极在100 mA g-1下实现了920 mAh g-1的可逆容量,明显高于未经修改的聚乙烯@CNT (300 mAh g-1).
- 证明了特殊的循环稳定性,在500个循环后保持了105.0%和100.6%的容量,分别是1和2Ag-1.
- 该材料保持了接近0.2V的存储特性,并表现出极好的速率性能.
结论:
- 新的刚性-柔性块共聚合物设计有效地提高了基于烯的阳极的容量和稳定性.
- 这种方法为设计没有额外活性组的高性能合有机阳极材料提供了一个新的策略.
- 与MWCNT集成创造了一个高效的3D电子传输网络,这对于提高电池性能至关重要.
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