Quality control tool of electrode coating for lithium-ion batteries based on X-ray radiography

JOURNAL OF POWER SOURCES

卷:298

Article

Etiemble, A.¹  Besnard, N.^2,3  Adrien, J.¹  Tran-Van, P.³  Gautier, L.⁴  Lestriez, B.²  Maire, E.¹ 

[1] Inst Natl Sci Appl, Lab MATEIS, CNRS UMR5510, F-69621 Villeurbanne, France

[2] Univ Nantes, CNRS UMR 6502, Inst Mat Jean Rouxel IMN, F-44322 Nantes, France

[3] Renault Technoctr, F-78084 Guyancourt, France

[4] Umicore Rechargeable Battery Mat, B-1000 Brussels, Belgium

关键词: Lithium ion battery;    Electrode;    Processing;    X-ray radiography;   

DOI  :  10.1016/j.jpowsour.2015.08.030

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free