在硫化物基全固态电池中的Si@N,S-Doped碳阳极的性能降解机制
Feng Sun1,2, Zhihui Ma1, Shenghai Xin1
1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 23, 2024
概括
在多孔 (p-mSi@C) 阳极上采用了一种新的N,S自补充无形碳涂层,显著提高了全固态电池的性能. 这种涂层增强了结构稳定性和电化学性能,克服了.
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:
- 阳极为电池提供高容量,但受到体积膨胀的影响.
- 这种扩张导致结构退化,并限制了商业可行性.
- 现有的阳极面临着碎片化和副产品形成的挑战.
研究的目的:
- 为所有固态电池开发稳定和高性能阳极.
- 调查N,S自吸附无形碳涂层在缓解阳极问题中的作用.
- 通过全面分析,阐明阳极的故障机制.
主要方法:
- 用N,S自补充无形碳 (p-mSi@C) 覆盖微米大小的多孔 (p-mSi).
- 在特定电流密度下进行电化学性能测试 (容量,库伦比效率).
- 结构特征和化学分析,以了解故障机制.
- 计算模拟来分析应力分布和故障模式.
主要成果:
- 该p-mSi@C阳极表现出极好的电化学性能,容量为2679.65 mAh g-1在0.2 mA cm-2和84%的初始库伦比效率.
- 无形碳层有效吸收应力,减少化过程中的碎片化.
- 该研究揭示并比较了裸体p-mSi和p-mSi@C阳极的化学失效机制.
结论:
- N,S 自补充无形碳涂层是一种可行的策略,可以提高全固态电池的阳极稳定性和性能.
- 了解故障机制为实际阳极开发提供了关键的理论指导.
- 开发的p-mSi@C复合材料为下一代高能量密度电池提供了一个有前途的途径.
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