Lithium Sulfide/Carbon (Li2S/C) Electrode Preparation in Hydrogen Sulfide (H2S) Flow and Its Electrochemical Performance
Since Li2S is very moisture sensitive, preparation of Li2S electrodes needs to be in a very controlled environment. We invented a new method to produce Li2S/C electrodes in a H2S flow, by using various lithium salts as starting materials. This way the air-sensitive Li2S is introduced in the electrode in the very last step. This lowers the process costs and allows an easier handling of the electrodes during preparation, since it is less moisture sensitive. Furthermore it might allow the use of aqueous binder systems which is novel for Li2S electrodes.
Electrodes containing a lithium salt, carbon and a binder were cast and after drying exposed to H2S. The resulting electrode consists of lithium sulfide, carbon and the binder. The reaction is confirmed by X-ray diffraction and elemental analysis. The morphology and homogeneity of the electrode is investigated by scanning electron microscopy. Galvanostatic cycling of the Li2S/C electrode validates the new method.
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