30 results about "Argyrodite" patented technology

The invention relates to an argyrodite thermoelectric material, the chemical formula of which is Ag8Sn(1-x)NbxSe6, x=0-0.05. The preparation method of the argyrodite thermoelectric material is characterized by, with simple substances being raw materials, carrying out material blending according to stoichiometric ratio of the chemical formula; after vacuum packaging, melting reaction quenching and thermal treatment quenching, grinding ingots into powders; and carrying out vacuum high-temperature hot-pressure sintering, and after slow cooling, obtaining a block material, which is the argyrodite thermoelectric material. Compared with the prior art, the high-performance thermoelectric material, which is low in heat conduction and high in thermoelectric performance, is prepared, and the method for preparing the thermoelectric material, which is high in density, high in mechanical strength and high in thermoelectric performance, is explored; the thermoelectric material has very low lattice thermal conductivity (0.2-0.4 W/m.K) in a whole-temperature range; when the temperature is 900 K, thermoelectric peak of the thermoelectric material reaches 1.2; when the temperature is 300-850 K, the average thermoelectric figure of merit zTave of the thermoelectric material is infinity-0.8; and the argyrodite thermoelectric material is a potential thermoelectric material.

The invention discloses a preparation method of sulfide solid electrolyte, which comprises: (1) weighing Li2S, P2S5 and an X-containing lithium salt according to a required stoichiometric ratio, and uniformly mixing, with the X comprising one or a plurality of Cl, Br and I; (2) grinding and screening the uniformly mixed mixture to obtain a uniformly mixed precursor; and (3) putting the precursor into a ceramic vibration tank in microwave equipment, vibrating and overturning, carrying out microwave sintering at the temperature of 150 to 400 DEG C for 10 min to 1 hour, and cooling to obtain theargyrodite type solid electrolyte containing Li, P, S and X elements. The method is simple in process and low in sintering temperature, product components are easy to control, the argyrodite type cubic phase solid electrolyte stable at the room temperature can be obtained, and the method can be applied to industrial large-scale production.

The invention belongs to the technical field related to the preparation of the lithium ion battery, and discloses a full solid-state lithium-sulfur battery. The full solid-state lithium-sulfur batterycomprises a metal negative electrode, a sulfide solid electrolyte and a composite positive electrode; the material of the metal negative electrode is selected from one of Li metal, Li-In alloy, Li-Alalloy, Li-Si alloy or Li-Sn alloy; the sulfide solid electrolyte is selected from one or combination of Li10GeP2S12 type solid electrolyte, Li2S-P2S5 glass-state electrolyte, and argyrodite type solid electrolyte; the composite positive electrode is commonly composed of selentellurium-doped sulfide polyacrylonitrile, a positive solid electrolyte with components same as that of the sulfide solid electrolyte, and a carbon-based conductive additive in a specific proportion. The invention further discloses a corresponding manufacturing method. Through the full solid-state lithium-sulfur battery disclosed by the invention, the defect that the conventional full solid-state lithium-sulfur battery is low in rate performance and low in active substance utilization efficiency can be well overcome,and a three-phase interface of the active substance, the solid electrolyte and the conductive auxiliary is optimized at the same time.

A sulfide-based solid electrolyte particle having a crystal phase of a cubic argyrodite-type crystal structure composed of Li, P, S and a halogen (Ha. The proposed sulfide-based solid electrolyte particle has a feature such that the ratio (Z_Ha2/Z_Ha1) of an element ratio Z_Ha2 of the halogen (Ha) at the position of 5 nm in depth from the particle surface to an element ratio Z_Ha1 of the halogen (Ha) at the position of 100 nm in depth from the particle surface is 0.5 or lower, as measured by XPS; and the ratio (Z_O2/Z_A2) of an element ratio Z_O2 of oxygen to the total Z_A2 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position of 5 nm in depth from the particle surface is 0.5 or higher, as measured by XPS.

The invention discloses a preparation method of a sulfide solid electrolyte, and the method combines wet ball milling and solid ball milling by taking CS2 as a raw material and a solvent. According to the invention, cheap Li2O2 or Li2O, P or P2O5, CS2 and LiX (X is Cl, Br or I) are used as raw materials, use of expensive Li2S is avoided, the solid electrolyte is prepared by adopting a method of combining reduced pressure wet ball milling and solid phase ball milling, CS2 is a raw material and a solvent, the reaction activity of the raw material is strong, the utilization rate is high, the preparation method is simple, high-temperature sintering is not needed, and the preparation method is suitable for industrial production. The prepared argyrodite type solid electrolyte has relatively high ionic conductivity and a relatively wide electrochemical window, and has high safety, high energy density and excellent cycling stability when being applied to preparation of all-solid-state batteries.

The invention relates to a novel low-thermal-conductivity argyrodite thermoelectric material and a preparation method thereof. A chemical formula of the thermoelectric material is Ag9Ga1-XMx(Se1-YSy)6, wherein, M is one selected from Cr, Cd, Zn or Ge, 0</=x</=0.06, and 0</=y</=0.10; during preparation, a simple substance with the purity of more than 99.99% is used as a raw material, and ingredients are weighed according to the stoichiometric ratio and placed in a sealed quartz tube for vacuum packaging; a muffle furnace is used for heating, so that the high-purity raw material is subjected to a melt reaction at a high temperature and then to rapid quench cooling, to obtain a first ingot; the first ingot is vacuum packaged in the quartz tube, and is subjected to high temperature annealing treatment and then to rapid quench cooling, to obtain a second ingot; the second ingot is grinded into powder which is placed in a graphite mold, hot pressed sintering is carried out throguh induction heating and temperature rise in a vacuum atmosphere, then slow cooling is performed, and completing the preparation. Compared with the prior art, the thermoelectric material of the invention has the advantages of stable mechanical property, very low lattice thermal conductivity (0.2W/m K), and good application prospect.

The invention discloses argyrodite type sulfide solid electrolyte and a preparation method thereof, and belongs to the technical field of battery materials. The sulfide electrolyte in the product developed by the invention is Li < 6 + x > Zr < x > P < 1-x > S5PF < 6 >. The preparation method comprises the following steps: manually grinding and mixing the raw materials in a glove box filled with inert gas, and then filling the mixture into a ball milling tank for ball milling; then tabletting the sample subjected to ball milling; and finally, sintering to obtain the target sulfide solid electrolyte. The obtained product has higher ionic conductivity, so that the practical application and development of the high-performance solid-state battery are accelerated.

The invention relates to a sulfide electrolyte material. The general formula of the sulfide electrolyte material is Li6PS5X1.xAgX2.yB2O3, wherein X1 is selected from one of chloride ions, bromide ions and iodide ions, and X2 is selected from one of chloride ions, bromide ions, fluoride ions, iodide ions and sulfate ions; 0 < x < = 0.5, and 0 < = y < = 0.5. By doping AgX2 in the argyrodite type sulfide electrolyte, the structural stability of the sulfide electrolyte material is improved; and boron oxide with a specific proportion is doped, so that the comprehensive performance of humidity stability and conductivity of the electrolyte material is improved.

The solid electrolyte according to the present invention contains a compound A that contains a crystal phase having an argyrodite-type crystal structure and that is represented by LiaPSbXc (X is at least one halogen element), and a compound B that contains a crystal phase having an argyrodite-type crystal structure. And a represents a number of 3.0 or more and 6.0 or less. And b represents a number of 3.5 or more and 4.8 or less. And c represents a number of 0.1 or more and 3.0 or less). The compound B is represented by LiX (in the formula, X is defined as above). The crystallite size of the compound B is 25 nm or more. The solid electrolyte is suitable when the BET specific surface area is 14.0 m2/g or less.

The invention relates to a preparation method of sulfide solid electrolyte. The preparation method comprises the following steps: firstly, dissolving argyrodite type sulfide solid electrolyte raw materials in an ultra-dry solvent according to a certain proportion, and violently stirring so that the raw materials are fully and uniformly mixed and react; after the reaction is finished, unreacted residual solids are removed through centrifugation, a solution is collected, and a solvent is removed to obtain powder; and finally, sintering the dried powder in a vacuum sealed quartz tube to obtain the argyrodite type sulfide solid electrolyte. The preparation method disclosed by the invention solves the problems of high energy consumption caused by a traditional solid-state method, non-uniform mixing of raw materials for preparing the sulfide electrolyte and the like, and can improve the conductivity of the prepared sulfide electrolyte.

The invention belongs to the technical field of solid electrolyte, and discloses a method for preparing doped argyrodite type sulfide solid electrolyte with high ionic conductivity in a liquid phase. The method comprises the following steps: 1) dispersing lithium sulfide and phosphorus pentasulfide in an organic solvent, heating, stirring and reacting to obtain a precursor solution containing Li3PS4; 2) mixing lithium iodide, powdered sulfur and an additive with the precursor solution, heating and stirring for reaction, and removing the organic solvent to obtain powder; and 3) sintering the powder in a protective atmosphere to obtain the argyrodite type sulfide solid electrolyte, and the additive is one or more of SiS2, GeS2, SnS2, As2S3 and Sb2S3. The method is simple, the prepared argyrodite type sulfide electrolyte is subjected to element doping in the thermal crystallization process, and the ionic conductivity and air stability of the electrolyte are improved. The method is suitable for industrial production.

The invention provides a solid electrolyte for a lithium battery, the solid electrolyte comprises a sulfide with a cubic system argyrodite type crystal structure, and the sulfide has the following molecular formula: Li < 5 + x > PS < 4 + x > Cl < 2-x-y-z > Br < y > I < z >, wherein x, y and z satisfy 0 < x < 1, 0 < y < 1, 0.09 < z < = 0.11, x + y + z = 2, and the ratio (y/x) of the molar ratio of Br to the molar ratio of Cl is 0.02-8, and the solid electrolyte has high ionic conductivity and extremely high stability to lithium metal.

An argyrodite-based solid electrolyte may contain a compound having a novel composition calculated by simulation of Ab initio molecular dynamics (AIMD). The solid electrolyte containing a compound having a novel composition that satisfies a certain range of monoatomic disorder (è) and a certain range of standard deviation (STD) of the size of the area formed as migration paths of Li metals, which are calculated by AIMD simulation, has an advantage of excellent ion conductivity due to promoted diffusion of monoatoms in the area.

The invention provides a sulfide solid electrolyte and a preparation method and application thereof, the chemical formula of the sulfide solid electrolyte is Li Si Sb < c > S < 5-x > O < x > I, a is greater than or equal to 6 and less than or equal to 7, b is greater than or equal to 0.5 and less than or equal to 0.7, c is greater than or equal to 0.3 and less than or equal to 0.5, and 1lt is 0; xlt; 1, the phase of the sulfide solid electrolyte is an argyrodite phase, the stability of the sulfide solid electrolyte in an organic solvent and air can be improved by doping antimony and oxygen elements in the electrolyte, and meanwhile, the conductivity of the sulfide solid electrolyte is improved;