在高容量离子电池阳极材料上以碳化聚乙烯"链接"固定SWNT
Yo Han Kwon, Krysten Minnici, Jung Jin Park1
1Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu , Daejeon 305-701 , Republic of Korea.
Journal of the American Chemical Society
|March 13, 2018
概括
结合的聚合物将单壁碳纳米管在阳极材料上,形成导电网络. 这通过稳定电极和增强动力学来提高电池性能.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 高容量阳极材料如纳米粒子 (SiNP) 和Fe3O4球体在电池循环过程中遭受粉碎.
- 有效的电网对于电池电极的有效传输至关重要.
- 将纳米材料固定在活性材料上可以提高电极的稳定性和性能.
研究的目的:
- 开发一种使用合聚合物将单壁碳纳米管 (SWNT) 固定在高容量阳极材料上的方法.
- 研究聚乙 (PPBT) 在形成电网和稳定电极中的作用.
- 评估这种架构对电池的电化学性能的影响.
主要方法:
- 作为桥梁分子的聚乙 (PPBT) 的合成.
- 证明PPBT能够将SWNT在Fe3O4球体 (sFe3O4) 和SiNP上.
- PPBT-SWNT-阳极材料接口的特性,包括化学结合和结构稳定性.
- 电化学测试以评估电池性能,包括循环稳定性,速率能力和阻抗.
主要成果:
- PPBT有效地将SWNT与sFe3O4和SiNP结合在一起,形成了强大的电网.
- PPBT结构促进了SWNT和阳极材料表面基之间的化学结合.
- 开发的架构抑制了电极厚度的变化,促进了稳定的固体电解质互相 (SEI) 形成,并降低了电极电阻.
- 观察到增强的电极动力学和优异的电化学性能.
结论:
- 像PPBT这样的合聚合物在SWNT和高容量阳极材料之间有效地产生稳定,导电的接口.
- 这种方法通过减轻电极降解,显著提高了电池的循环稳定性和电化学性能.
- 这些发现突出了设计用于储能应用的先进电极架构的有希望的策略.
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