Determining the Origin of Lithium Inventory Loss in NMC622||Graphite Lithium Ion Cells Using an LiPF6-Based Electrolyte

Author:

Heidrich Bastian,Stamm Maik,Fromm Olga,Kauling Johanna,Börner MarkusORCID,Winter Martin,Niehoff PhilipORCID

Abstract

X-ray photoelectron spectroscopy (XPS) is often used in interphase investigations of lithium ion batteries (LIBs). Yet, it is unclear, if its results convey an accurate picture of the lithium loss in aged LIBs. Herein, electrochemical and surface analytical approaches were used to separately quantify the contribution of interphase growth to lithium loss in LIBs. For this, LIB pouch cells (NMC622||graphite, 5 Ah) were aged for 400 full cycles at 20 °C or 60 °C. Electrodes were harvested post mortem and subsequent investigations in lithium metal battery cells showed notably higher reversible and irreversible lithium loss after 60 °C than after 20 °C cycling. While the interphases did not notably increase in thickness with aging, the surface area of both electrodes increased, leading to more electrolyte decomposition and larger lithium loss. Along with the surface area increase, more heterogeneous electrolyte decomposition product residues on the negative electrode surface and higher cathode|electrolyte charge-transfer resistances were observed. In conclusion, the applied combination of XPS and nitrogen adsorption can quantify homogenously distributed electrolyte decomposition layers of thicknesses <10 nm, but not thick and heterogeneous decomposition product residues arising with 60 °C cycling. For this, the need for an alternative quantification method is highlighted.

Funder

Bundesministerium für Bildung und Forschung

Publisher

The Electrochemical Society

Subject

Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials

Cited by 7 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3