期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 165, 期 10, 页码 A2145-A2153出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0461810jes
关键词
-
资金
- BASF SE through its Research Network on Electrochemistry and Batteries
- BMBF (Federal ministry of Education and research, Germany) under the ExZellTUM II project [03XP0081]
Lithium-Ion batteries consisting of LNMO (LiNi0.5Mn1.5O4) cathodes and graphite anodes show severe capacity fading at elevated temperatures due to a damage of the solid electrolyte interface (SEI) on the anode. Hence, a detailed investigation of the anode with electrochemical impedance spectroscopy (EIS) can provide valuable insight into the phenomenon of anode degradation. In this study, we use a modified version of our novel impedance procedure (Part I of this study), where the anode impedance is measured at non-blocking conditions (10% SOC) and blocking conditions (0% SOC) in a graphite/LNMO full-cell with a gold wire micro-reference electrode (GWRE). We show that during cycling an ionic contact resistance (R-Cont.Ion) at the separator/anode interface evolves, which is most likely caused by manganese dissolution from the high-voltage cathode (LNMO). By simultaneously fitting EIS spectra in blocking and non-blocking conditions, we can deconvolute the anode impedance evolving over 86 cycles at 40 degrees C into contributions of: a) the separator resistance (R-Sep.), b) the true charge transfer resistance (R-CT), and, c) the ionic contact resistance (R-Cont.Ion) evolving at the separator/anode electrode interface. We also show that the main contributor to a rising anode impedance is the ionic contact resistance (R-Cont.Ion). (C) The Author(s) 2018. Published by ECS.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据