期刊
JOURNAL OF POWER SOURCES
卷 298, 期 -, 页码 285-291出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.08.030
关键词
Lithium ion battery; Electrode; Processing; X-ray radiography
资金
- IMD (Institut de la Mobilite Durable - Sustainable Mobility Institute)
A simple and efficient method, based on X-ray radiography, is developed to check the quality (homogeneity of the thickness, presence of defects) of NMC-, LFP- and NMC/LFP-based electrode coating for Li-ion batteries at the scale of several cm(2) with a resolution of 20 Am. As a first step, the attenuation coefficient of NMC- and LIP-based coating is experimentally determined according to the Beer Lambert law. Then, the attenuation coefficient of each active material is estimated from these experimental results and X-ray attenuation databases, which allows establishing an attenuation law for any coating composition. Finally, thanks to this relationship, the thickness can be evaluated in each spot of the film and the defects, such as pinholes or broad edges with gradual decrease of the thickness coating, can be detected. The analysis of NMC-, LFP- and NMC/LFP-based electrodes shows that the coating quality decreases as coating thickness increases and as the nanometric vs. micrometric material content increases in the coating composition. This reveals detrimental aspects of nanomaterials with respect to their use in composite electrode manufactured through conventional slot-die or casting process. (C) 2015 Elsevier B.V. All rights reserved.
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