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支浸透性的相互依赖 - - 电极沉积率 - - 金属阳极和SEI微观结构的相互依赖

Chang-An Lo¹, Yixian Wang², Varun R Kankanallu¹

¹Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA.

Angewandte Chemie (International ed. in English)

|September 15, 2024

概括

当前的采集器化学和沉积率在无阳极金属电池 (AF-SMB) 中显著影响金属微结构和固体电解质介相 (SEI) 形成. 这些因素影响薄膜形态,多孔性和SEI组成,影响电池性能.

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
电池技术电池技术

背景情况:

没有阳极的金属电池 (AF-SMB) 提供高能量密度,但在金属阳极的稳定性方面面临挑战.
电流收集器的表面化学和电沉积条件极大地影响了固体电解质介相 (SEI) 的形成.

研究的目的:

研究性 (Na2Te) 与性 (Cu) 电流采集器支对金属微观结构和SEI形成的影响.
在工业相关条件下分析电极沉积率对金属和SEI特征的影响 (6 mAh cm−2, 0.53 mA cm−2).

主要方法:

综合的同步龙X射线纳米图和放牧发生率广角X射线散射 (GIWAXS) 用于详细的微观结构分析.
低温离子束 (cryo-FIB) 显微镜用于SEI的高分辨率成像.
介面尺度建模以了解SEI在电沉积物增长和电化学稳定中的作用.

主要成果:

根据支化学和沉积速率观察到膜形态,内部多孔性和结晶学偏好方向 (例如, (110) 与 (100) 和 (211)) 的显著差异.
在SEI中,Na2Te支导致化 (NaF) 的流行率更高,而Cu支显示出更多的化 (NaH) 和氧化 (NaOH).
由于竞争性谷物生长,晶体的首选方向取决于厚度.

结论:

电流采集器化学和电沉积率是控制AF-SMB中的金属阳极行为的关键参数.
受到这些参数影响的SEI的离子导电性和形态,在调节电沉积物增长和防止电化学不稳定性方面发挥着关键作用.

关键词:

纤维质地纤维质地电影的成长电影的成长金属阳极是一种金属阳极.金属电池金属电池是什么固体电解质相间 (SEI) 阶段

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