加强和石墨之间的界面相互作用,以提高离子电池的循环稳定性
Yuanjiang Dong1,2, Chang Liu1,2, Fei Li1,2
1State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, P. R. China.
ACS applied materials & interfaces
|July 29, 2025
概括
这项研究引入了一种用于离子电池的新/碳复合物 (Si&AG),其特点是均分散的纳米颗粒被碳化层定. 这种结构显著提高了电极稳定性和电化学性能.
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
- 纳米技术纳米技术
背景情况:
- 颗粒的均分散和稳定的电极结构是开发先进的/碳复合材料的关键挑战.
- 阳极具有较高的理论容量,但由于化/脱过程中的体积膨胀,其循环稳定性较差.
- 现有的方法很难在和碳宿主之间实现强大的接口相互作用.
研究的目的:
- 合成一种具有增强界面相互作用的/碳复合材料 (Si&AG),以提高离子电池阳极性能.
- 研究碳化 (SiC) 界面层在碳基质内稳定纳米粒子中的作用.
- 为了评估合成的Si&AG复合材料作为阳极材料的电化学特性.
主要方法:
- 使用高频等离子技术对纳米粒子进行蒸发,核化和在石墨上均分散.
- 在-石墨界面形成一个薄而坚固的碳化 (SiC) 层.
- 作为离子电池阳极的Si&AG复合物的电化学测试,包括循环稳定性和速率性能评估.
主要成果:
- 成功合成了Si/C复合物 (Si&AG) 与纳米结晶,在石墨上均分散的颗粒.
- 在接口上形成了一个坚固而薄的SiC层,确保了和石墨之间强大的粘附.
- 实现了87.9%的显著初始库伦比克效率 (ICE) 和优异的容量保留 (在0.1 A g-1的500个循环后达到78.1%).
- 证明了出色的速率能力,在3Ag-1的高电流密度下提供149.6mAhg-1.
结论:
- 由SiC层促进的强化界面相互作用是Si&AG阳极稳定结构和优越电化学性能的关键.
- 开发的高频等离子技术为制备高性能Si/C复合体阳极提供了有效的途径.
- 这种Si/C复合材料对下一代高能离子电池显著有前途.
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