11 results about "Phosphorus pentasulphide" patented technology

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 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.

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.

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.