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Thick Binder-Free Electrodes for Li-Ion Battery Fabricated Using Templating Approach and Spark Plasma Sintering Reveals High Areal Capacity

Abstract : The templating approach is a powerful method for preparing porous electrodes with interconnected well-controlled pore sizes and morphologies. The optimization of the pore architecture design facilitates electrolyte penetration and provides a rapid diffusion path for lithium ions, which becomes even more crucial for thick porous electrodes. Here, NaCl microsize particles are used as a templating agent for the fabrication of 1 mm thick porous LiFePO4 and Li4Ti5O12 composite electrodes using spark plasma sintering technique. These sintered binder-free electrodes are self-supported and present a large porosity (40%) with relatively uniform pores. The electrochemical performances of half and full batteries reveal a remarkable specific areal capacity (20 mA h cm(-2)), which is 4 times higher than those of 100 mu m thick electrodes present in conventional tape-casted Li-ion batteries (5 mA h cm(-2)). The 3D morphological study is carried out using full field transmission X-ray microscopy in microcomputed tomography mode to obtain tortuosity values and pore size distributions leading to a strong correlation with their electrochemical properties. These results also demonstrate that the coupling between the salt templating method and the spark plasma sintering technique turns out to be a promising way to fabricate thick electrodes with high energy density.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03611426
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Soumis le : jeudi 17 mars 2022 - 10:32:42
Dernière modification le : mardi 13 septembre 2022 - 09:28:25

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Rakesh Elango, Arnaud Demortiere, Vincent de Andrade, Mathieu Morcrette, Vincent Seznec. Thick Binder-Free Electrodes for Li-Ion Battery Fabricated Using Templating Approach and Spark Plasma Sintering Reveals High Areal Capacity. Advanced Energy Materials, Wiley-VCH Verlag, 2018, 8 (15), ⟨10.1002/aenm.201703031⟩. ⟨hal-03611426⟩

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