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通过超越SEI形成,超快地沉积有面的多面体

Xintong Yuan¹, Bo Liu¹, Matthew Mecklenburg²

¹Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, USA.

|August 2, 2023

概括

研究人员发现了金属沉积物的内在形十二面体形状,通过控制固体电解质相间形成,使人们对电池电沉积有了新的理解,并提高了电池的性能.

科学领域:

材料科学
电化学
电池技术

背景情况:

金属电沉积对于高能电池至关重要,但由于固体电解质间相 (SEI) 形成而复杂化.
缺乏对沉积的了解阻碍了先进电池技术的发展.

研究的目的:

将沉积与SEI形成分离, 从根本上了解内在沉积过程.
研究金属沉积的形态及其对电池性能的影响.

主要方法:

使用超快速沉积电流密度超过SEI形成.
使用冷电子显微镜可视化沉积形态.
开发了一种脉冲电流协议来控制沉积.

主要成果:

发现金属的内在沉积形态是形十二面体,独立于电解质或电流收集器.
确定这些结构与电流收集器的近点接触,导致不活跃的形成.
证明脉冲电流协议,利用这些形状作为核种子,使密度增长和电池性能提高.

结论:

从SEI形成中解离沉积提供了对电池电化学的基本见解.
十二面体形态是影响沉积和电池性能的一个关键因素.
开发的脉冲电流协议为设计更好的金属电池提供了策略.

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