使用Operando扫描电子显微镜在充电/放电期间观察基于的负电极活性材料的形态变化
Takako Kurosawa1, Noriaki Fukumoto1, Kaoru Inoue2
1Green Innovation Center, Green Transformation Division, Panasonic Holdings Corporation, 3-1-1 Yagumo-Nakamachi, Moriguchi City, Osaka 570-8501, Japan.
Microscopy (Oxford, England)
|January 9, 2025
概括
我们使用操作扫描电子显微镜观察了电池循环期间基于的负电极材料的变化. 单在充电过程中首先膨胀,而石墨在放电过程中首先收缩.
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
- 电池技术 电池技术
背景情况:
- 了解电池运行期间基于的负电极材料的形态变化对于材料处理和电极设计至关重要.
- 直接观察这些动态过程具有挑战性,但对于优化电池性能至关重要.
研究的目的:
- 开发和应用一个操作扫描电子显微镜 (操作SEM) 技术,用于定量评估Si基负电极材料的膨胀和收缩.
- 在离子电池循环过程中观察单 (SiO) /石墨复合电极的形态行为.
主要方法:
- 开发一个专门的操作SEM设置,用于观察小型全固态离子电池.
- 在SEM中现场充电和放电电池,以监测颗粒体积变化.
- 与电池容量相关的膨胀和收缩系数的定量分析.
主要成果:
- 操作式SEM技术成功地可视化了电池循环期间基于Si的电极粒子的动态形态变化.
- 在SiO/石墨负电极中,观察到单 (SiO) 在充电过程中最初膨胀.
- 发现复合电极内的石墨元件在放电过程中首先收缩.
结论:
- 该研究表明,操作式SEM的实用性用于基于Si的负电极材料的现场表征.
- 对SiO和石墨元件独特的膨胀/收缩行为的洞察力为改进电极设计提供了基础.
- 这些发现有助于理解先进电池中电极材料形态,容量和膨胀/收缩系数之间的关系.
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