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Electroanalytical Measurement of Interphase Formation at a Li Metal–Solid Electrolyte Interface
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-11-16 , DOI: 10.1021/acsenergylett.0c01840
Andrew S. Westover 1 , Robert L. Sacci 1 , Nancy Dudney 1
Affiliation  

The interphase between Li metal and solid electrolytes dictates performance in Li metal batteries. For the solid electrolyte Lipon, we electroanalytically measure a capacity loss of 1.03 ± 0.16 μAh/cm2 when Lipon first contacts Li metal. Assuming this capacity is all lost to interphase formation, this corresponds to a maximum Li consumption of 5.0 ± 0.8 nm to form an interphase ∼4.7 nm thick. From dynamic electrochemical impedance spectroscopy (dEIS) during Li plating, we determine that nonlinear chaotic spectra demark this interphase formation and that this occurs immediately upon initiation of Li plating. dEIS also reveals interfacial resistance during both plating and stripping that decreases as the amount of plated Li increases.

中文翻译:

锂金属-固体电解质界面上相间形成的电分析测量

锂金属和固体电解质之间的界面决定了锂金属电池的性能。对于固体电解质立顿,当立顿首次接触锂金属时,我们用电分析法测量了1.03±0.16μAh/ cm 2的容量损失。假设此能力全部消失于相间形成,则相当于形成一个约4.7 nm厚的相间的最大Li消耗为5.0±0.8 nm。从锂电镀过程中的动态电化学阻抗谱(dEIS),我们确定非线性混沌光谱标志着这种相间形成,并且这在锂电镀开始后立即发生。dEIS还显示出镀覆和剥离过程中的界面电阻随镀覆Li量的增加而降低。
更新日期:2020-12-11
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