A sulfide solid electrolyte containing lithium, phosphorus, sulfur; and one or more of elements X selected from the group consisting of halogen elements and chalcogen elements excluding sulfur, wherein the sulfide solid electrolyte includes an argyrodite-type crystal structure, and wherein a molar ratio of the lithium to the phosphorus, a (Li/P), a molar ratio of the sulfur to the phosphorus, b (S/P), and a molar ratio of the element X to the phosphorus, c (X/P), satisfy formulas (1) to (3): 5.0≤a≤7.1 (1) 1.0<a−b≤1.5 (2) 6.5≤a+c<7.1 (3) wherein b>0 and c>0 are satisfied.

A method for preparing high-purity lithium sulfide by using industrial-grade butyllithium includes the following steps: step A: under an inert gas condition, thoroughly mixing 1.5-2.5 g of lithium chloride, 0.5 L of an industrial-grade n-butyllithium solution (2.5 mol/L) and 1.5-2.5 L of n-hexane to obtain a mixed solution, and charging the mixed solution into a sealed container; step B: under the sealed condition, firstly introducing H.sub.2S gas into a gas-washing bottle through a submerged pipe at a rate of 10.5 L/h, then introducing into the mixed solution through the submerged pipe, controlling the reaction temperature at 25-40° C., and continuously stirring for reaction for 4-6 h to obtain a reaction slurry; and step C: under an inert gas condition, filtering the reaction slurry with a G3 sand core funnel to obtain a crude lithium sulfide solid wet material.

A method for preparing high-purity lithium sulfide by using industrial-grade butyllithium includes the following steps: step A: under an inert gas condition, thoroughly mixing 1.5-2.5 g of lithium chloride, 0.5 L of an industrial-grade n-butyllithium solution (2.5 mol/L) and 1.5-2.5 L of n-hexane to obtain a mixed solution, and charging the mixed solution into a sealed container; step B: under the sealed condition, firstly introducing H.sub.2S gas into a gas-washing bottle through a submerged pipe at a rate of 10.5 L/h, then introducing into the mixed solution through the submerged pipe, controlling the reaction temperature at 25-40° C., and continuously stirring for reaction for 4-6 h to obtain a reaction slurry; and step C: under an inert gas condition, filtering the reaction slurry with a G3 sand core funnel to obtain a crude lithium sulfide solid wet material.

The present disclosure provides a method of producing a sulfide solid electrolyte material which includes a preparing process of preparing composite particles including a solid solution including a Li.sub.2S component and a LiBr component; an addition process of adding the composite particles and a phosphorus source to a reaction chamber; and a milling process in which a mechanical milling treatment is performed on the composite particles and the phosphorus source in the reaction chamber while thermal energy is applied.

The present disclosure provides a method of producing a sulfide solid electrolyte material which includes a preparing process of preparing composite particles including a solid solution including a Li.sub.2S component and a LiBr component; an addition process of adding the composite particles and a phosphorus source to a reaction chamber; and a milling process in which a mechanical milling treatment is performed on the composite particles and the phosphorus source in the reaction chamber while thermal energy is applied.

A lithium-sulfide-carbon composite and methods are shown. In one example, the lithium-sulfide-carbon composites are used as an electrode in a battery, such as a lithium ion battery.

A lithium-sulfide-carbon composite and methods are shown. In one example, the lithium-sulfide-carbon composites are used as an electrode in a battery, such as a lithium ion battery.

Systems and methods are provided for upgrading aromatic refinery fractions by performing trim alkali metal desulfurization. The alkali metal desulfurization can be performed by mixing the aromatic refinery fraction with alkali metal in finely dispersed solid and/or molten form, such as molten sodium. The aromatic nature of the refinery fraction can potentially be beneficial for the desulfurization reaction mechanism. The aromatic refinery fractions can correspond to fractions that have been previously processed to remove metals. Because only trim desulfurization is being performed, the desulfurization can be performed under relatively mild alkali metal desulfurization conditions that result in a reduced or minimized amount of feed conversion.

Systems and methods are provided for upgrading aromatic refinery fractions by performing trim alkali metal desulfurization. The alkali metal desulfurization can be performed by mixing the aromatic refinery fraction with alkali metal in finely dispersed solid and/or molten form, such as molten sodium. The aromatic nature of the refinery fraction can potentially be beneficial for the desulfurization reaction mechanism. The aromatic refinery fractions can correspond to fractions that have been previously processed to remove metals. Because only trim desulfurization is being performed, the desulfurization can be performed under relatively mild alkali metal desulfurization conditions that result in a reduced or minimized amount of feed conversion.

A sulfide solid electrolyte containing lithium, phosphorus, sulfur; and one or more of elements X selected from the group consisting of halogen elements and chalcogen elements excluding sulfur, wherein the sulfide solid electrolyte includes an argyrodite-type crystal structure, and wherein a molar ratio of the lithium to the phosphorus, a (Li/P), a molar ratio of the sulfur to the phosphorus, b (S/P), and a molar ratio of the element X to the phosphorus, c (X/P), satisfy formulas (1) to (3): 5.0a7.1 (1) 1.0<ab1.5 (2) 6.5a+c<7.1 (3) wherein b>0 and c>0 are satisfied.