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1mm 1mm (a) Very low loading (b) Strongly non-uniform deposition 1mm 1mm (c) Cracked electrode (d) Proper electrode Figure 3.5: SEM micrographs of differently prepared electrodes, illustrating various issues with the preparation process. Magnification: 50×. Details see text. to loss of electronic contact. Therefore, the slurry composition had to be changed in order to deposit more electrode material in one coating run. Subsequently, the active material content was increased from 68 % to 80 %. Simultaneously, the consistency of the slurry was increased to a solid:solvent ratio of 1:7, compared to an initial 1:20. Efforts to further increase the ratio, e.g. to 1:4, were abandoned, since the high vis- cosity causes severe problems with the doctor blading step (data not shown). When subjected to the same processing as before, however, the improved slurry yielded poor electrodes, shown in Fig. 3.5b. A strongly non-uniform deposition was observed, caused by poor dispersion of the active material powder and the carbon black. Disper- sion is considerably improved if the mixing step is longer and more powerful. If the mixing is too powerful, however, it may not be suitable for this material despite the superior dispersion. Fig. 3.6 shows an electrode whose slurry was mixed in a 20 ml 40PDF Image | Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling
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