15 results about "Phosphorus pentasulphide" patented technology

The present invention provides a sulfide-polymer composite solid electrolyte and a preparation method thereof, belonging to the field of batteries. In the present invention, lithium sulfide reacts with phosphorus pentasulfide to generate a partially crystallized sulfide network, and high-valent metal ions are doped to optimize the lattice structure, enhancing conductivity and chemical stability; the crystalline phase provides an efficient ion migration channel, and the amorphous region reduces the grain boundary effect and improves the conduction uniformity; a metal chloride and lithium fluoride coating layer is used to isolate moisture and oxygen, and polyaniline coating reduces the interfacial impedance and enhances the cycle stability. The crystallinity is reduced and the amorphous region is increased by sulfonated polyether ether ketone, providing a low-impedance path for lithium ions; the polyethylene glycol chain segment improves the flexibility and ion migration ability, and the three-dimensional network structure is formed by crosslinking to enhance the mechanical strength and interfacial stability. The inorganic phase and the polymer act synergistically to construct a bicontinuous ion conductive network to improve the comprehensive performance.

The invention relates to a preparation method and application of a lithium sulfide material containing lithium polysulfide. The preparation method comprises the following steps: weighing lithium hydride and powdered sulfur according to a molar ratio of 2: (1.01-1.10), dividing the lithium hydride into 2-4 parts, taking one part of lithium hydride and powdered sulfur, mixing and ball-milling, sequentially adding the rest lithium hydride, and ball-milling to obtain mixture powder containing lithium sulfide and lithium polysulfide, namely the lithium sulfide material containing lithium polysulfide. Sulfur loss caused by phosphorus pentasulfide decomposition and sulfur element volatilization in the sulfide solid electrolyte preparation and sintering process is supplemented through lithium polysulfide, and the purity and the room-temperature ionic conductivity of the sulfide solid electrolyte are improved.

The application discloses a ball milling system applied to phosphorus pentasulfide, relates to the technical field of ball milling equipment, and comprises a support frame provided with a driving device and a ball mill arranged on the support frame and in transmission connection with the driving device. The ball mill comprises a shell, a filter partition group, a transmission assembly and at least two ball mill inner containers arranged in the shell. The filter partition group is arranged in the shell, the two ball mill inner containers are arranged on opposite sides of the filter partition group and are in communication with each other, and the filter partition group is used for filtering materials in the ball mill inner containers. One of the two ball mill inner containers is fixedly connected to one side of the filter partition group, and the other ball mill inner container is movably connected to the other side of the filter partition group through the transmission assembly. The ball milling speed can be greatly improved, the probability of uneven distribution of material particles after grinding can be reduced, and the quality of the final product can be ensured.

The invention relates to the technical field of preparation of food-grade phosphoric acid, in particular to a preparation method of food-grade phosphoric acid. The method comprises the following steps: extracting an industrial-grade phosphoric acid solution by using tributyl phosphate to obtain an organic phase containing phosphoric acid; carrying out arsenic removal reaction on the organic phase and phosphorus pentasulfide, and filtering to obtain an arsenic-removed phosphoric acid solution; under the condition that nitrogen is introduced, active diatomite is used for carrying out a defluorination reaction on the arsenic-removed phosphoric acid solution, and a defluorinated phosphoric acid solution is obtained; performing a readily oxidizable substance removal reaction on the defluorinated phosphoric acid solution by using nitrogen and an oxidizing agent to obtain a readily oxidizable substance removal phosphoric acid solution; carrying out desulfurization reaction on the readily oxidizable oxide-removed phosphoric acid solution by using a desulfurizing agent, and filtering to obtain a desulfurized phosphoric acid solution; carrying out aging treatment, filtration and back extraction on the desulfurized phosphoric acid solution to obtain a clear phosphoric acid solution; and performing ultrafiltration and nanofiltration on the clarified phosphoric acid solution to obtain the food-grade phosphoric acid solution. According to the preparation method, the impurity removal effect of the food-grade phosphoric acid product can be improved on the premise of low cost through a series of technologies.

The present technology relates to inorganic compounds having an argyrodite-type structure based on an alkali metal obtained by a preparation process comprising a step of grinding the sulfide of the alkali metal, the sulfate of the alkali metal, phosphorus pentasulfide and a halide of the alkali metal. Also described are electrode materials, electrodes, electrolytes comprising said inorganic compound having an argyrodite-type structure and their uses in electrochemical cells, for example, in electrochemical accumulators, particularly in all-solid-state batteries.

The invention relates to the technical field of preparation of solid-state electrolytes, in particular to a modified doped lithium phosphorus sulfur chlorine solid-state electrolyte, a preparation method thereof and a solid-state battery. The preparation method comprises the following steps: dispersing lithium sulfide, phosphorus pentasulfide, lithium chloride and a modified doping agent into acetonitrile in an inert atmosphere environment to obtain a suspension liquid; in an inert atmosphere environment, heating the turbid liquid to remove acetonitrile, and grinding to obtain a precursor; and pyrolyzing the precursor in an inert atmosphere environment to obtain the modified doped lithium phosphorus sulfur chlorine solid electrolyte. According to the invention, acetonitrile is adopted as a dispersing solvent to replace traditional mechanochemical ball milling synthesis, the lithium phosphorus sulfur chlorine solid electrolyte can be modified by directly adding a doping agent in a solvent mixing and dispersing stage, the method and required equipment are simple, the synthesis period is short, batch production can be realized, and the method has a very good commercial prospect.

This invention discloses a sulfide solid electrolyte, its preparation method, and a battery, belonging to the field of battery material technology. The preparation of the sulfide solid electrolyte includes: thermally reacting the raw materials for the preparation of the sulfide solid electrolyte; tangentially filtering the material obtained after the thermal reaction; and spray-drying the solid obtained from the tangential flow filtration. The raw materials include a first precursor, a second precursor, and a solvent. The first precursor includes lithium sulfide, and the second precursor includes at least one selected from phosphorus pentasulfide, silicon sulfide, germanium sulfide, tin sulfide, sodium sulfide, potassium sulfide, ammonium sulfide, calcium sulfide, and arsenic sulfide. This method has a relatively simple process flow and operation, low energy consumption and cost, and high production efficiency, making it suitable for industrial production. The sulfide solid electrolyte obtained in this way is relatively soft, making it easier to contact the positive and negative electrodes under extrusion conditions during the further preparation of the battery, improving density, thereby facilitating electron transport and reducing losses.

There is provided a diphosphorus pentasulfide composition according to the present embodiment, in which a degree of crystallinity calculated from a spectrum obtained by X-ray diffraction using a CuKa ray as a ray source is equal to or more than 40% and equal to or less than 80%, in a DSC curve of the diphosphorus pentasulfide composition obtained by measurement using a differential scanning calorimeter under conditions of a start temperature of 25°C, a measurement temperature range of equal to or more than 30°C and equal to or less than 350°C, a temperature rising rate of 5°C / min, and an argon atmosphere of 100 ml / min, an endothermic peak is observed in a temperature range of equal to or more than 280°C and equal to or less than 300°C, and a heat of fusion of the endothermic peak is equal to or more than 60 J / g and equal to or less than 100 J / g.

The invention relates to a preparation method of a lithium tin phosphorus sulfur solid-state battery. The preparation method comprises the following steps: grinding and mixing phosphorus pentasulfide, tin disulfide, lithium sulfide, lithium chloride and an additive in an argon atmosphere, performing high-temperature calcination, and pressing into a sheet to obtain a lithium tin phosphorus sulfur solid electrolyte sheet; stirring lithium manganate, carbon black, a binder and a solvent into uniform slurry, coating an aluminum foil current collector with the slurry, and drying, rolling and forming to obtain a positive electrode; taking a lithium metal sheet as a negative electrode; in a glove box filled with argon, placing the lithium tin phosphorus sulfur solid electrolyte sheet between the positive electrode and the negative electrode, tightly attaching the positive electrode and the negative electrode, and packaging and sealing to obtain the lithium tin phosphorus sulfur solid battery; the additive is prepared by carrying out a reaction on epoxy acrylate, lithium carbamate, 9-ethyl-3-amino carbazole and a catalyst 1, 8-diazabicyclo undec-7-ene; the lithium tin phosphorus sulfur solid-state battery prepared by the invention has excellent ionic conductivity and cycle performance.

A method for fabricating a solid-state electrode plate is provided. The method involves mixing precursors capable of chemically reacting to form a target solid electrolyte (SSE) together with one or more components of a binder, an electrode active material, and a conductive carbon in a solvent to form a coating slurry. The precursors undergo a chemical reaction in the solvent to form the target SSE. The coating slurry is applied to a current collector. The solvent is evaporated from the coating slurry on the current collector, forming a solid-state electrode plate with a target SSE. The precursors can be lithium sulfide (Li₂S) and phosphorus pentasulfide (P₂S₅), which react in a tetrahydrofuran (THF) solvent to form a sulfide-based SSE such as Li₃PS₄.

The phosphorus pentasulfide composition according to the present embodiment has a degree of crystallization of 40-80% (inclusive) as calculated from a spectrum obtained by X-ray diffraction using CuK [alpha] rays as a radiation source. In a DSC curve of the phosphorus pentasulfide composition measured using a differential scanning calorimeter under conditions of a starting temperature of 25 DEG C, a measurement temperature range of 30-350 DEG C, a temperature increase rate of 5 DEG C / min, and 100 mL of argon per minute, an endothermic peak is observed in a temperature range of 280-300 DEG C, and the heat of fusion of the endothermic peak is 60-100 J / g.

A solid electrolyte for an all solid state lithium battery includes lithium phosphorus sulfide(LPS), which has been doped during synthesis with a metal halide, such as zirconium tetrachloride. The synthesis includes adding the metal halide to lithium sulfide and phosphorus pentasulfide precursor materials, followed by ball milling and heat treatment.

The invention provides a sulfide-polymer composite solid electrolyte and a preparation method thereof, and belongs to the field of batteries. Lithium sulfide and phosphorus pentasulfide react to generate a partially crystallized sulfide network, and high-valence metal ions are doped to optimize a lattice structure, so that the conductivity and the chemical stability are enhanced; the crystal phase provides an efficient ion migration channel, and the amorphous region reduces the grain boundary effect and improves the conduction uniformity; a metal chloride and lithium fluoride coating layer is used for isolating moisture and oxygen, and polyaniline coating is used for reducing interface impedance and enhancing cycling stability. The crystallinity is reduced and an amorphous region is increased through sulfonated polyetheretherketone, so that a low-impedance path is provided for lithium ions; a polyethylene glycol chain segment improves the flexibility and the ion migration ability, and a three-dimensional network structure is formed through crosslinking to enhance the mechanical strength and the interface stability. And the inorganic phase and the polymer have a synergistic effect to construct a bicontinuous ionic conductive network to improve the comprehensive performance.

A method of making a solid state electrode sheet is provided. The method includes mixing a precursor capable of chemically reacting to form a target solid state electrolyte (SSE) with one or more of a binder, an electrode active material, and conductive carbon in a solvent to form a coating slurry. The precursor is chemically reacted in a solvent to form a target SSE. And applying the coating slurry to the current collector. The solvent in the coating slurry on the current collector is evaporated, thereby producing a solid state electrode sheet having the target SSE. The precursors may be lithium sulfide (Li2S) and phosphorus pentasulfide (P2S5), which react in a tetrahydrofuran (THF) solvent to produce sulfide-based SSE, such as Li3PS4.

The present technology relates to inorganic compounds having an argyrodite-type structure based on an alkali metal obtained by a preparation process comprising a step of grinding the sulfide of the alkali metal, the sulfate of the alkali metal, phosphorus pentasulfide and a halide of the alkali metal. Also described are electrode materials, electrodes, electrolytes comprising said inorganic compound having an argyrodite-type structure and their uses in electrochemical cells, for example, in electrochemical accumulators, particularly in all-solid-state batteries.