85 results about "Sulfur utilization" patented technology

Provided is a rechargeable alkali metal-sulfur cell comprising an anode active material layer, an electrolyte, and a cathode active material layer containing multiple particulates of a sulfur-containing material selected from a sulfur-carbon hybrid, sulfur-graphite hybrid, sulfur-graphene hybrid, conducting polymer-sulfur hybrid, metal sulfide, sulfur compound, or a combination thereof and wherein at least one of the particulates is composed of one or a plurality of sulfur-containing material particles being embraced or encapsulated by a thin layer of a high-elasticity polymer having a recoverable tensile strain no less than 10% when measured without an additive or reinforcement, a lithium ion conductivity no less than 10⁻⁵ S/cm at room temperature, and a thickness from 0.5 nm to 10 μm. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, and long cycle life.

A cathode active material for a metal-sulfur battery is provided. By using a cathode active material for a metal-sulfur battery comprising a sulfur-carbon composite composed of composited spherical sulfur compound particle and carbon material particle, electric conductivity of the cathode for a lithium-sulfur battery is increased to improve initial capacity close to theoretical capacity and polysulfide lost in the cathode during charging and discharging is minimized to increase sulfur utilization. Reaction between a metal anode and the polysulfide is minimized to increase life span and stability of the metal-sulfur battery.

The invention discloses a sulfur/porous carbon-coated carbon nano tube compound positive material for a lithium-sulfur battery and a preparation method thereof. The lithium-sulfur battery compound positive material is formed by compounding a carbon nano tube compound carbon material coated with porous carbon with a micro-nano structure and elemental sulfur. The preparation method comprises the following steps of: firstly coating poly-dopamine on the surface of a carbon nano tube; then carrying out high temperature carbonization, and compounding with the elemental sulfur to obtain the compound positive material. The preparation method disclosed by the invention has the advantages of easiness for operation and low cost. The prepared lithium-sulfur battery compound positive material is high in sulfur utilization ratio and greatly enhances the cycle property of the lithium-sulfur battery.

The invention discloses a TiO2 coated sulfur/ordered mesoporous carbon composite cathode material and a preparation method thereof as well as the application thereof in a secondary aluminum battery. The cathode material consists of a sulfur active substance, ordered mesoporous carbon and TiO2 and is characterized in that the ordered mesoporous carbon has a highly-ordered three-dimensional pore structure, is provided with a conductive network and provides a large number of adhesion area for the active substance and a conductive channel; a TiO2 coating layer has a very effective shuttle effect of blocking polysulfide. The preparation method of the TiO2 coated sulfur/ordered mesoporous carbon composite cathode material comprises the following steps: compounding the ordered mesoporous carbon and sulfur and then TiO2 coating on an outer layer. The preparation method has the advantages of simple process, low cost, no toxic raw material used, environmental friendliness, high energy density and high sulfur utilization rate, and the rate performance and the cycle life of the secondary aluminum battery are greatly improved.

The invention discloses a carbon sulfur compound anode for a secondary battery. The anode is formed by compounding a carbon nanotube array, sulfur and graphene, is provided with a three-dimensional network conductive framework and is good in electrochemical performance. A preparation method of the anode comprises the following steps: compounding elemental sulfur in the carbon nanotube array at first and then wrapping an outer layer with few graphene sheet layers. The preparation method is simple in process, low in cost and environment-friendly due to nonuse of toxic raw materials; moreover, the compound anode does not need to be added with a conductive agent and a bonder, and is high in energy density and sulfur utilization rate, and the rate performance and the cycle performance of the secondary aluminum battery are greatly improved.

The invention relates to a ternary metal oxide composite MXene material for positive electrode materials of lithium-sulfur batteries and a preparation method of the ternary metal oxide composite MXenematerial. The method includes: etching in hydrofluoric acid solution to obtain MXene, preparing a NiCo2O4 composite MXene material through hydrothermal reaction, and preparing a sulfur-NiCo2O4-MXenecomposite material by sulfur doping through ball milling and hot melting, namely the ternary metal oxide composite MXene material is obtained. A two-dimensional lamellar structure of MXene is beneficial to quick interlamination diffusion of electrolyte ions to achieve an excellent rate performance, and more spaces are provided for storage of active substances, so that electrode stability is improved. By introduction of a ternary metal oxide NiCo2O4, lithium polysulfide adsorption of surface polar active sites is promoted, active substance sulfur utilization rate is increased, MXene expansion can be realized, and a large volume expansion buffer space and excellent electrochemical performances are achieved.

Provided is a rechargeable alkali metal-sulfur cell comprising an anode active material layer, an electrolyte, and a cathode active material layer containing multiple particulates of a sulfur-containing material and wherein at least one of the particulates is composed of one or a plurality of sulfur-containing material particles being embraced or encapsulated by a thin layer of a high-elasticity polymer (containing a polyrotaxane network having a rotaxane structure or a polyrotaxane structure at a crosslink point of the polyrotaxane network) having a recoverable tensile strain from 2% to 1,500%, a lithium ion conductivity no less than 10⁻⁶ S/cm at room temperature, and a thickness from 0.5 nm to 10 μm. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, and long cycle life.

The invention provides a new lithium sulfur battery positive electrode, a preparation method thereof and a lithium sulfur battery comprising the new lithium sulfur battery positive electrode. The new lithium sulfur battery positive electrode comprises a metal current collector, elemental sulfur or a sulfur compound as a positive electrode active material coating the metal current collector, transition metal powder, a conductive material and a binder. The lithium sulfur battery comprising the new lithium sulfur battery positive electrode has high sulfur utilization rate and excellent cycle stability, to be more specific, the discharge capacity of sulfur per unit weight in the positive electrode composite material reaches up to 1624mAh/g, the elemental sulfur utilization rate reaches more than 97%, and after hundreds of times of cycling at the room temperature, the highest positive electrode specific discharge capacity can be maintained at more than 88% of the theoretical specific discharge capacity (1675mAh/g) of the elemental sulfur.

The invention discloses a novel lithium-sulfur battery and a preparation method thereof. The novel lithium-sulfur battery comprises an anode, an electrolytic solution and a lithium-containing cathode, wherein the electrolytic solution comprises a solvent and an electrolyte, the anode preferably adopts a sulfur-free porous electrode, the electrolytic solution also contains sulfur and/or sulfide, and the electrolyte comprises a lithium salt. The preparation method comprises the steps of: respectively preparing the anode, the electrolytic solution and the lithium-containing cathode and assembling the anode, the electrolytic solution and the lithium-containing cathode into a novel lithium-sulfur battery. According to the simple novel lithium-sulfur battery provided by the invention, the complex preparation process of the sulfur anode is avoided, the process cost is reduced, and the problems of difficulty in exerting the capacity due to non-uniform distribution of an active substance sulfur in the conventional sulfur anode material, low sulfur utilization rate, instable performance of the battery, and the like can also be avoided.

Provided is a technique for resource utilization of lead and silver residues for zinc hydrometallurgy. The technique comprises the steps that the dried lead and silver residues, lead concentrate and additives are blended, so that a mixture is obtained; the mixture is fed to an oxygen-enriched bottom-blowing furnace for oxidation smelting after being subjected to granulation, and primary lead and furnace residues are separated out; the furnace residues are fed into an oxygen lateral blowing metal smelting reduction furnace, broken coal and a flux are added to the oxygen lateral blowing metal smelting reduction furnace, so that furnace residues of the oxygen lateral blowing metal smelting reduction furnace are formed; the furnace residues are fed into a fuming furnace to obtain secondary lead; as for silver entering the primary lead and the secondary lead, anode mud is added in the electrolytic lead refining process of the primary lead and the secondary lead, and the silver is extracted from the anode mud; and as for zinc and lead entering smoke of the fuming furnace, the smoke is subjected to defluorination and dechlorination, zinc is obtained through hydrometallurgical leaching and extracted through electrodeposition, the lead is in the leaching residues, and then the lead is recovered through lead smelting. The technique is simple, the recovery rate of the lead in the lead and silver residues is about 95%, the zinc recovery rate is about 90%, the silver recovery rate is about 95%, and the sulfur utilization rate is about 90%.

The invention relates to a preparation method of a carbon nanotube-lithium sulfide-carbon composite material. The preparation method comprises the following steps: dissolving sublimed sulfur powder in anhydrous methylbenzene to form a transparent solution A; performing ultrasonic dispersion on carbon nanotubes in a lithium triethylborohydride tetrahydrofuran solution to form a suspension B; adding the solution A into the suspension B to obtain a carbon nanotube-Li2S composite material suspension, and heating to evaporate the solvent so as to obtain carbon nanotube-Li2S composite material powder; and finally, putting the carbon nanotube-Li2S material in an inert atmosphere, and performing chemical vapor deposition to form the carbon nanotube-Li2S-C composite material. The carbon nanotube-lithium sulfide-carbon composite material prepared by the invention has favorable electric conductivity and high coating tightness, can improve the electric conductivity of a Li2S electrode, effectively inhibits dissolution and dispersion of polysulfide in an electrolyte, and increases the sulfur utilization ratio; and meanwhile, the porous structure of the carbon nanotubes has a cushioning effect on volume expansion and shrinkage of an sulfur electrode in the charge/discharge process.

The invention relates to a preparation method of a sulfurized polyacrylonitrile anode material used for a lithium secondary battery, and belongs to the technical field of materials. The preparation method is that sulfur and polyacrylonitrile are dissolved in dimethyl sulfoxide to have a crosslinking conjugation reaction and then are carbonized in a nitrogen environment at a temperature of 500 DEG C to obtain the sulfurized polyacrylonitrile material. The sulfur content of the sulfurized polyacrylonitrile material obtained through the preparation method is remarkably increased, the sulfur is distributed evenly, and the sulfurized polyacrylonitrile material has a graphite crystal structure and is remarkably improved in conductivity and stability. In the electrochemical test, the sulfurizedpolyacrylonitrile material shows the discharge quality specific capacity up to 1312mAh.g<-1> and the sulfur utilization rate up to 98.3%, and keeps 77% of the cycling stability of the maximum performance after 60 cycles under the conditions of 0.5C charge-discharge rate and 45 discharge cycles. The results show that the sulfurized polyacrylonitrile material prepared according to the method is an active material suitable for a lithium sulfur battery.

The invention discloses a lithium-sulfur battery cathode composite material and a preparation method thereof. According to the cathode composite material, elemental sulfur is cladded by an electric-conduction polymer poly(N-vinylcarbazole), the sulfur cathode material is guaranteed to have good electric conductivity, also sulfur and electro-discharge products thereof are constrained in the sulfur cathode material, so that relatively high sulfur utilization rate and cycling stability are obtained. According to the technical scheme, the disadvantages of sulfur as a lithium ion secondary cell cathode material are overcome, the lithium-sulfur battery cathode composite material, which is long in cycling life, high in capacity, green, environment-friendly, and simple in method, is prepared. The preparation method is simple, equipment is simple, raw material source is wide, cost is low, and the preparation method is in favor of industrial production.

Provided is a rechargeable alkali metal-sulfur cell comprising an anode active material layer, an electrolyte, and a cathode active material layer comprising multiple particulates, wherein at least one of the particulates comprises one or a plurality of sulfur-containing material particles being embraced or encapsulated by a thin layer of a conductive sulfonated elastomer composite having from 0.01% to 50% by weight of a conductive reinforcement material dispersed in a sulfonated elastomeric matrix material, wherein the conductive reinforcement material is selected from graphene sheets, carbon nanotubes, carbon nanofibers, metal nanowires, conductive polymer fibers, or a combination thereof and the composite has a recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10⁻⁷ S/cm to 5×10⁻² S/cm, and a thickness from 0.5 nm to 10 μm. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, and long cycle life.

The invention relates to a preparation method of a graphene-sulfur microcapsule composite, comprising: first, introducing organic molecules of hydroxy, sulfydryl, amino, carboxy or other groups to thesurface of graphene oxide by means of physical adsorption or chemical grafting; second, preparing graphene-coated sulfur microcapsule by means of mechanical blending. A core material is common sulfur, and the surface of the core material is subjected to graphene oxide or graphene modification to form a core-shell structure. The graphene shell herein can effectively enclose the sulfur therein, andblooming during rubber processing is inhibited; the rich functional groups on the surface or edge of the graphene enable the sulfur to be evenly dispersed in a rubber base during mixing stage and engage in sulfurization reaction during sulfurization stage, thermal stability of the sulfur is improved, and excellent properties are imparted to the composite. The prepared graphene-sulfur microcapsulecomposite has high purity, good thermal stability, high coating rate, high sulfur utilization rate and low cost.

The invention relates to a lithium sulfur battery composite cathode material and a preparation method thereof. The composite cathode material is prepared by compounding ferrite with elemental sulfur.The ferrite is one of magnesium ferrite, zinc ferrite, copper ferrite or manganese ferrite. The preparation method includes: preparing a ferrite material by high temperature calcination method, and then conducting compounding with elemental sulfur by liquid phase method. The preparation method has a mature process and simple procedure, and is easy to acquire a high sulfur content composite cathodematerial. The lithium sulfur battery composite cathode material prepared by the invention utilizes the strong chemical adsorption effect of ferrite on polar lithium polysulfide, greatly inhibits thedissolution of lithium polysulfide in an ether electrolyte solution, accordingly slows down the shuttle effect, and then shows characteristics of high sulfur content, high sulfur utilization and highcycle stability.

The invention relates to the technical field of a lithium-sulfur battery positive electrode material, and provides a molybdenum carbide sulfur composite material and preparation method and applicationthereof. The molybdenum carbide sulfur composite material comprises molybdenum carbide and elemental sulfur, wherein the molybdenum carbide is of a porous rod-shaped structure, the length of the molybdenum carbide is 1-5 micrometers, the diameter of the molybdenum carbide is 30-60 nanometers, the elemental sulfur is doped into gaps of the molybdenum carbide, and the mass ratio of the molybdenum carbide and the elemental sulfur is (1-9):(9-1). The molybdenum carbide sulfur composite material provided by the invention has relatively high specific area and electron conductivity, the sulfur utilization ratio can be improved, and a shuttle flying effect is relieved. Through charge-discharge test on a lithium-sulfur battery prepared by the molybdenum carbide sulfur composite material, reversible capacity of (623-653) mAh/g still can be maintained after circulation for 500 times, the capacity is maintained at 70% or above, the lithium-sulfur battery has coulobmic efficiency exceeding 93%, and the cycle property can be remarkably improved.

The invention discloses a room-temperature sodium sulfur secondary battery. The room-temperature sodium sulfur secondary battery comprises a positive plate, a negative plate, an electrolyte solution and a diaphragm which are held in a battery shell, wherein the electrolyte in the electrolyte solution comprises imidazole electrolyte and also comprises chain-shaped and ring-shaped ether electrolyte and/or chain-shaped and ring-shaped ester electrolyte; a positive active material is adhered to the surface of the positive plate and is prepared by compounding a sulfur composite active material and a conductive agent with a conductive effect according to a weight ratio of (8-10) to 1. According to the room-temperature sodium sulfur secondary battery, the internal resistance of the battery is reduced; the storage and utilization of sulfur in the battery are improved; the sulfur utilization efficiency is improved; the room-temperature sodium sulfur secondary battery is high in conductivity; positive and negative active materials can be fully used; the performance of the battery can be improved; the service life of the battery can be prolonged; the room-temperature sodium sulfur secondary battery has a strong competitiveness in the secondary battery market in the future.

The invention discloses a method for efficiently removing copper through crude bismuth pot refining. The method is characterized by comprising the following steps: adding saw dust as a swelling agent in the process of adding sulfur to remove copper according to a mass ratio of sulfur to saw dust being 1 to 0.4, and mixing and stirring water with the saw dust to be uniform. Because the boiling point of water is 100 DEG C, the contact time of sulfur and melt can be effectively prolonged. According to the addition of mixed sulfur, copper can be efficiently removed from bismuth solution. Because the saw dust has the effect of the swelling agent, the defects that sulfur is agglomerated and has small contact area with the bismuth solution and the like are overcome, the sulfur utilization rate is effectively improved, the problems that sulfur is directly burnt and the sulfur utilization rate is low in the process of adding sulfur to remove copper are solved, and the direct recovery rate of bismuth is effectively improved.

The invention relates to a method for coproducing porous silicon dioxide, aluminum hydroxide and ferrite yellow when producing medium and low grade sulfurous iron ores, which comprises: the sulfurous iron ores are crushed and directly enter a fluidized bed furnace for roasting to obtain sulfur dioxide gas and cinder; the sulfur dioxide gas is used for further producing sulfuric acid or reducing production of sulfur; the cinder is subjected to magnetic separation to obtain iron concentrate or directly added with a chemical additive and then subjected to grinding and heating reaction, wherein the addition of the chemical additive is 2 to 4 times of the weight of the cinder; the cinder is dissolved for 1 to 3 hours under the acid condition after heating reaction, and the porous silicon dioxide is obtained after filtration and separation; the pH value of filtrate is adjusted to be between 9 and 12, the filtrate stands and is filtrated, and filter residue ferric hydroxide is washed and roasted to obtain a high-purity ferrite yellow pigment; and the pH value of the filtrate for filtrating the ferric hydroxide is adjusted to be between 4 and 6.5, the filtrate stands and is filtrated and separated to obtain aluminum hydroxide, and the aluminum hydroxide finished product is obtained after washing and drying the aluminum hydroxide. The method can improve the sulfur utilization rate by 40 to 50 percent, solves the problem of environmental pollution in the prior art, and fully utilizes all the compositions coproduced with the medium and low grade sulfurous iron ores.