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在金属阳极上直接测量固体电解质间相的电特性

Yaobin Xu^1,2, Hao Jia^3,2, Peiyuan Gao⁴

¹Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA.

Nature energy

|January 22, 2024

概括

电池中的固体电解质介相 (SEI) 的电气性质不明. 这项研究揭示了电压依赖的SEI导电性,这对于设计更好的可充电电池至关重要.

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:

固体电解质介面 (SEI) 对于可充电电池的性能至关重要.
一个理想的SEI应该是电绝缘但离子导电.
缺少SEI电气性质的直接表征.

研究的目的:

直接测量SEI的电特性.
了解SEI特性与电池性能之间的关系.
为有针对性的SEI设计提供见解.

主要方法:

使用现场偏差传输电子显微镜 (TEM).
在铜和基板上测量SEI的差电导率.
与库伦比效率和循环稳定性相关联的SEI电气性能.

主要成果:

在SEI中表现出电压依赖的差电导.
更高的导电率与更厚,地形复杂的SEI相关.
较厚的SEI导致离子电池的库伦比克效率和循环稳定性较差.

结论:

可以直接测量SEI电气性能.
SEI导电是影响电池性能的一个关键因素.
了解SEI的电气行为可以为改进的电池进行有针对性的设计.

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