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强大的阳极的化/混合介面的无电形成

Yingli Wang¹, Fangming Liu¹, Guilan Fan¹

¹College of Chemistry, Nankai University, Tianjin 300071, P. R. China.

Journal of the American Chemical Society

|February 15, 2021

概括

研究人员开发了一种用于金属阳极的新型化混合固体电解质互相 (SEI). 这种增强的SEI显著提高了电池的稳定性和循环性能,为高能量密度的可充电电池铺平了道路.

科学领域:

材料科学
电化学
电池技术

背景情况:

稳定的固体电解质间相 (SEI) 形成对于高能量密度电池的金属阳极性能至关重要.
金属的重复涂层/剥离会导致SEI的不稳定性和电池的退化.

研究的目的:

为金属阳极设计一个稳定的化/混合过关.
提高可充电电池的性能和寿命.

主要方法:

简单的无电解质浸泡方法来创建混合界面.
联合实验和计算表征 (例如,XRD,SEM,TEM,XPS,DFT) 来分析SEI结构和属性.
对称的电池和全电池 (LiFePO4阴极) 用于性能评估.

主要成果:

一种由NaF,LiF,LiPO2F2和有机成分组成的化SEI已成功合成.
混合SEI具有丰富的粒度边界和优越的Li接口特性.
与没有NaF的SEI相比,提高了离子导电性和机械强度.
在对称电池中,金属在10 mAh cm−2下无地循环超过1300小时.
在0. 5°C的200个循环后,全细胞表现出96. 70%的长期稳定性.

结论:

开发的化混合 SEI 有效地稳定了金属阳极.
这种方法为设计强大的多功能SEI提供了有前途的策略,以推进下一代电池的金属阳极.

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