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Multiscale Morphological and Electrical Characterization of Charge Transport Limitations to the Power Performance of Positive Electrode Blends for Lithium‐Ion Batteries
Author(s) -
Besnard Nicolas,
Etiemble Aurélien,
Douillard Thierry,
Dubrunfaut Olivier,
TranVan Pierre,
Gautier Laurent,
Franger Sylvain,
Badot JeanClaude,
Maire Eric,
Lestriez Bernard
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201602239
Subject(s) - materials science , electrode , lithium (medication) , characterization (materials science) , electrochemistry , focused ion beam , dielectric spectroscopy , horizontal scan rate , ion , scanning electron microscope , nanotechnology , analytical chemistry (journal) , optoelectronics , composite material , cyclic voltammetry , chemistry , medicine , endocrinology , chromatography , physics , quantum mechanics
In this work, exhaustive characterizations of 3D geometries of LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC), LiFePO 4 (LFP), and NMC/LFP blended electrodes are undertaken for rational interpretation of their measured electrical properties and electrochemical performance. X‐ray tomography and focused ion beam in combination with scanning electron microscopy tomography are used for a multiscale analysis of electrodes 3D geometries. Their multiscale electrical properties are measured by using broadband dielectric spectroscopy. Finally, discharge rate performance are measured and analyzed by simple, yet efficient methods. It allows us to discriminate between electronic and ionic wirings as the performance limiting factors, depending on the discharge rate. This approach is a unique exhaustive analysis of the experimental relationships between the electrochemical behavior, the transport properties within the electrode, and its 3D geometry.