PDF Publication Title:
Text from PDF Page: 114
electrolyte composition. More precisely, we studied the impact of this additive on the cyclability of sulfur electrode, and of graphite one, when cycling in ether-based electrolyte. The first part of this chapter will be devoted to the development of Li2S electrodes: beginning from the fabrication process, to the understanding of the phenomena which govern the electrochemistry of this material, until final conclusions. A comparison with sulfur cathodes will also be provided. In the following part, a proof-of-concept of full Li-ion/S system composed of Li2S and Si electrodes will be demonstrated. 4.2. Lithium sulfide (Li2S) electrode: development and studies The main drawbacks of Li2S material arise from its low ionic (~ 10-13 S cm-1)145 and electronic conductivity, which give rise to low utilization of Li2S active material. Therefore, a sufficient mixing and intimate contact with conductive additives are required, and a specific electrode optimization for this particular material needs to be performed as compared with the case of S8. Last but not least, preparation methods are also restricted due to its high reactivity against moisture, and the next section describes the method of electrode preparation applied in this work. 4.2.1. Experimental section 4.2.1.a) Electrodes preparation Lithium sulfide is very sensitive to air moisture, thus all the steps of the electrodes preparation and other manipulations were carried out in an argon-filled glove box. Li2S was purchased from two different suppliers: Sigma Aldrich (99.98% trace metal basis) and Alfa Aesar (99.9% metal basis, -200 mesh powder) and used as-received. This choice is further discussed in this chapter, and eventual differences between the two grades of powders are commented. For some electrodes, ball milling pre-treatment of Li2S powder was applied, and more detailed description can be found in section 4.2.7.a). SuperP® (Timcal)* and PVdF 6020 (Solvay) were used as a standard conductive additive and polymeric binder, respectively. The ‘reference’ * Ketjenblack® carbon additive (EC-300J, AkzoNobel; particle size of 30 nm, BET of 800 m2 g-1) was also tested. The cyclability tests gave practically the same results, as when using SuperP®, as it was also the case for sulfur- based electrodes. Thus, SuperP® was selected as a ‘reference’ choice for carbon additive. Chapter 4: Li2S electrode 110PDF Image | Accumulateur Lithium Soufre
PDF Search Title:
Accumulateur Lithium SoufreOriginal File Name Searched:
WALUS_2015_archivage.pdfDIY PDF Search: Google It | Yahoo | Bing
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
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)