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Table of context General introduction ...................................................................9 Chapter 1: Literature review...........................................................................13 1.1. Introduction to Li-ion batteries.....................................................................................13 1.2. Introduction to Lithium/Sulfur Batteries ......................................................................15 1.2.1. Principles and working mechanism .......................................................................16 1.2.2. Li/S system limitations ..........................................................................................19 1.2.2.a) Positive electrode issues .................................................................................20 1.2.2.b) Electrolyte related limitations.........................................................................21 1.2.2.c) Negative electrode issues................................................................................22 1.3. State of the art and the strategies undertaken for Li/S system improvements..............22 1.3.1. Positive electrode...................................................................................................23 1.3.1.a) Sulfur/carbon composite architecture.............................................................23 1.3.1.b) The effect of a binder......................................................................................25 1.3.1.c) The effect of sulfur loading vs. sulfur fraction ...............................................27 1.3.1.d) Carbon based current collectors .....................................................................29 1.3.1.e) Alternative positive electrode: lithium sulfide (Li2S).....................................31 1.3.2. Electrolyte..............................................................................................................34 1.3.3. Negative electrode .................................................................................................37 1.4. Advanced characterization methods applied to Li/S system ........................................38 1.5. Conclusions...................................................................................................................42 Chapter 2: Sulfur positive electrode on Al collector – studies and important parameters determination ........................................ 43 2.1. Motivation of the work .................................................................................................43 2.2. Experimental part..........................................................................................................44 2.2.1. Preparation of the electrodes and the electrolyte ...................................................44 2.2.2. Battery assembly....................................................................................................46 2.2.3. Characterization methods and tests conditions......................................................47 2.2.4. Discussion concerning the results’ margin of error ...............................................48 2.3. The influence of different parameters of the electrodes ...............................................49 2.3.1. The effect of the conductive carbon additive.........................................................49 3 Table of contextPDF Image | Accumulateur Lithium Soufre
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