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2.3.1.a) SuperP® vs. Ketjenblack® ...............................................................................49 2.3.1.b) SuperP® vs. VGCF®........................................................................................51 2.3.2. The effect of a binder and active material loading ................................................54 2.3.3. EIS investigation....................................................................................................58 2.3.3.a) The effect of the electrode thickness ..............................................................60 2.3.3.b) The influence of the insulating nature of active material ...............................60 2.3.3.c) The influence of the conducting carbon .........................................................62 2.3.3.d) The effect of the binder nature .......................................................................63 2.3.3.e) The effect of the electrode elaboration process ..............................................63 2.3.3.f) Interpretation of ‘HF to MF’ and ‘MF’ regions response - summary.............65 2.3.4. Correlation of the EIS results with cycling performances.....................................66 2.3.4.a) Cycling results ................................................................................................66 2.3.4.b) Post-mortem studies .......................................................................................68 2.3.5. Conclusions............................................................................................................70 Chapter 3: Porous 3D carbon current collector - a potential way for the electrode improvements ...............................................................71 3.1. Non-woven carbon felt (NwC) - physical and structural properties.............................71 3.2. Preparation of the electrodes.........................................................................................73 3.2.1. The effect of imprecise NwC collector mass estimation and related capacity error ........................................................................................................................ 74 3.3. Morphology of the electrode: before and after cycling ................................................76 3.4. Electrochemical performances of ‘S-on-NwC’ electrode.............................................78 3.4.1. Typical galvanostatic cycling response (C/20)......................................................78 3.4.2. Voltage profile and capacity retention at various currents ....................................80 3.4.3. Lower voltage limit and its correlation with different S/C ratios..........................83 3.4.4. Towards heavily loaded electrodes........................................................................85 3.4.5. Capacity based on a complete weight of the electrode..........................................86 3.4.6. Aluminum vs. NwC-based electrodes: comparative studies..................................87 3.4.7. The importance of the electrolyte amount .............................................................94 3.4.8. Surface area vs. porosity – a dominant factor? ......................................................96 3.4.8.a) The effect of the surface area..........................................................................96 3.4.8.b) The effect of pressing .....................................................................................99 3.4.9. Binder-free ‘melted sulfur-NwC’ electrodes performances ................................101 3.4.10. ‘Insulated sulfur electrode’ coin cell concept....................................................103 4 Table of contextPDF Image | Accumulateur Lithium Soufre
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Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
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