Understanding the calendering processability of Li(Ni0.33Mn0.33Co (0.33))O-2-based cathodes

JOURNAL OF POWER SOURCES

卷:488

Article

Primo, Emiliano N.^1,2  Chouchane, Mehdi^1,2  Touzin, Matthieu³  Vazquez, Patricia⁴  Franco, Alejandro A.^1,2,5,6 

[1] Univ Picardie Jules Verne, CNRS, Lab Reactivite & Chim Solides LRCS, Hub Energie,UMR 7314, 15 Rue Baudelocque, F-80039 Amiens, France

[2] CNRS, Reseau Stockage Electrochim Energie RS2E, FR 3459, Hub Energie, 15 Rue Baudelocque, F-80039 Amiens, France

[3] Univ Lille, CNRS, Cent Lille, INRAE,UMR 8207,UMET Unite Mat & Transformat, F-59000 Lille, France

[4] Univ Reims, GEGENAA, EA 3795, 2 Esplanade Roland Garros, F-51100 Reims, France

[5] ALISTORE European Res Inst, CNRS, FR 3104, Hub Energie, 15 Rue Baudelocque, F-80039 Amiens, France

[6] Inst Univ France, 103 Blvd St Michel, F-75005 Paris, France

关键词: Lithium ion batteries;    NMC Cathodes;    Calendering;    Mechanical properties;    Electrode mesostructure;   

DOI  :  10.1016/j.jpowsour.2020.229361

来源: Elsevier

【 摘 要 】

The calendering process aims at enhancing the electrode energy density, and improving the electronic conductivity, and determines the final porous electrode micro/mesostructure. In this sense, one of the main parameters of interest is its impact in the electrode porosity (epsilon) and the electrochemical performance. Here, we present a systematic study of the calendering conditions (applied calender pressure and roll temperature) effect on the final NMC-based electrodes epsilon in terms of the active material/carbon additive/binder composition and the amount of solvent used during the preparation of the slurries. The calendering processability was assessed through the cathodes compressibility resistance and minimal attainable epsilon, the electrode mechanical properties (hardness and elastic deformability), the pore size distribution, the electrode film mesostructure and the C-rate cathode electrochemical performance. Based on our results, it was found that the distribution and organization of the inactive carbon black (CB)/PVdF phase and the electrode mesostructure are the key parameters that control the cathode processability through calendering. Electrodes with high CB/PVdF content and prepared with higher amounts of solvent in the slurry ensure a good electronic conductivity and a film-like structure of the electronic conducting phase around the NMC particles which upon calendering outputs a better electrochemical performance.

【 授权许可】

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