形全碳多孔芳香框架为硫电池提供主机
Viksit Kumar1,2, Bharathkumar H Javaregowda2,3, George Devasia2,4
1Organic Chemistry Division, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India.
Small (Weinheim an der Bergstrasse, Germany)
|April 24, 2025
概括
可扩展的全碳多孔3D聚合物 (3DPs) 通过防止聚硫化物迁移来提高硫电池的性能. 基于Pyrene的3DP显示出显著的循环稳定性和高容量,克服了关键的电池挑战.
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:
- 硫电池 (LSB) 提供高的理论能量密度,但面临诸如聚硫化物穿和循环稳定性差等挑战.
- 现有的宿主材料往往需要复杂的功能化或包含异原子,限制其实际应用.
研究的目的:
- 研究可扩展,无异原子和非功能化的3D多孔聚合物 (3DPs) 作为LSB主机的使用.
- 评估使用基于的3DPs与基于的3DPs相比,使用LSB的性能提升.
主要方法:
- 合成没有异原子或功能组的全碳多孔3D聚合物 (3DPs).
- 用3DP作为主机对LSB进行电化学测试,包括循环稳定性和容量保留测量.
- 在3DP宿主结构中分析聚硫化物封闭和相互作用机制.
主要成果:
- 含有Pyrene的3DP表现出卓越的循环稳定性,在1°C的600个循环后保持75%的容量,在0.2°C的1300个循环后保持52%.
- 具有高硫载荷 (4.1 mg cm-2) 的 LSB 与 pyrene 3DP 实现了 600 mAh g-1 容量,在 250 个循环中保持稳定的性能.
- 3DP的孔隙结构在物理上限制了多硫化物,而 π-π 与多硫化物的相互作用减轻了它们的穿效应.
结论:
- 可扩展,无功能的3DP是提高LSB性能的有效主机.
- 基于Pyrene的3DPs通过解决聚硫化物问题,显著提高了LSB的循环稳定性和容量保留.
- 3DPs和多硫化物之间的离子-π相互作用是提高电池性能的关键机制.
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