Thick Binder‐Free Electrodes for Li–Ion Battery Fabricated Using Templating Approach and Spark Plasma Sintering Reveals High Areal Capacity |
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Authors: | Rakesh Elango Arnaud Demortière Vincent De Andrade Mathieu Morcrette Vincent Seznec |
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Institution: | 1. Laboratoire de Réactivité et de Chimie des Solides (LRCS), CNRS UMR7314, Université de Picardie Jules Verne, Amiens, France;2. Réseau Fran?ais sur le Stockage Electrochimique de l'Energie (RS2E), France;3. ALISTORE‐ERI, France;4. Advanced Photon Sources Beam line, Argonne National Laboratory, Argonne, IL, USA |
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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 µm 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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Keywords: | LiFePO4/Li4Ti5O12 Li– ion batteries SPS technique templating approach thick and binder‐free electrodes TXM microcomputed tomography |
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