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with the use of Dispermat®. From the same ink, five different electrodes, with linearly increased coating thicknesses, were obtained (77 – 95 – 109 – 130 – 147 μm). Symmetric coin cells were built with these electrodes and the results are presented on Figure 2-17. (a) (b) Figure 2-17. Nyquist plots of the symmetric coin cells built with the P VdF-based electrodes (S/SuperP®/PVdF = 80/10/10 wt%), where binder was incorporated to the electrode ink through intensive stirring with Dispermat®. Different thicknesses of the electrodes are indicated on the graph. For comparison, Nyquist plot of a ‘typical’ PVdF-based electrode (obtained by manual ink mixing) is presented (a). A zoomed view (b). For the electrodes obtained through mixing with Dispermat®, very similar behavior to the CMC-based electrodes can be observed: two small semicircles are present, very stable regardless the electrode thickness. Moreover, the characteristic frequency values for both visible loops are almost the same, as the one observed for the CMC-based electrodes (Figure 2-16, in black). However, an increase of the thickness is visible in the MF→LF transition region, which has previously been associated with restricted diffusion impedance, and is coherent with restricted diffusion behavior explained by Aurbach and Levi228. This results clearly indicate that the preparation method, and mostly the way of a binder incorporation, influences the electrode EIS response. More precisely, the binders’ response in terms of the resistance could be expressed as follow: CMCdispermat ~ PVdFdispermat << PVdFmanual. In addition, we also evaluated the BET surface of the PVdF-based electrode obtained with Dispermat. The modification of the process results in a slightly decreased surface area (5.1 m2 g-1), as compared with 5.5 m2 g-1 for the classical electrode preparation (i.e. manual stirring). Thus, even if the specific surface is not largely modified, the evolution of the BET value is coherent with better dispersion of PVdF, which permits to cover better carbon particles. However, the impedance response is impacted more significantly than the BET values. Chapter 2: S8 electrode on Aluminum 64PDF Image | Accumulateur Lithium Soufre
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