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frequencies). However, the particle shape/morphology may have significant effect on the resistance value. 2.3.3.d) The effect of the binder nature Figure 2-16 shows typical Nyquist plot of a symmetric coin cell built with CMC-based electrodes (in black). A remarkable difference in the EIS response can be observed, as compared with previously described PVdF-based electrodes (in red). Figure 2-16. Nyquist plot of the symmetric coin cells built with the electrodes having different binders: PVdF (in red) and CMC/NBR (in black), with composition S/SuperP®/binder = 80/10/10 wt%. Both types of electrodes having very similar thickness of ~ 80–85 μm and sulfur loading of ~ 3.5–4.0 mgsulfur cm-2. CMC-based electrode clearly displays two well-separated semicircles, but very small in size. A drastic decrease of the MF semicircle (previously associated with the bulk response of the electrode) is observed for the CMC-based electrode as compared with the PVdF-based one, whereas the first semicircle, observed at higher frequency, seems not to be impacted. Moreover, the characteristic frequencies of both semicircles are very close to those obtained with PVdF binder. Furthermore, the CMC-based electrodes display very similar EIS spectra, no matter the electrode thickness (which was not the case for the PVdF-based samples). 2.3.3.e) The effect of the electrode elaboration process Previously demonstrated results made us questioned the way how the binder got incorporated into the ink, and if the manual ink preparation of the PVdF-based electrodes could explain alone the large resistance response, or if the EIS response is dependent from the binder nature. To verify that, a PVdF-based electrode was prepared the same way as the CMC-based one, i.e. Chapter 2: S8 electrode on Aluminum 63PDF Image | Accumulateur Lithium Soufre
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