39results about How to "Improve air stability" patented technology

The invention provides a halide solid-state electrolyte and a preparation method and application thereof. The halide solid-state electrolyte comprises a halide solid-state electrolyte inner core and a halide solid-state electrolyte outer core, and the hydrophobic layer is uniformly coated on the halide solid electrolyte core, and the hydrophobic layer comprises bis-hexadecyl phosphate. According to the halide solid electrolyte as well as the preparation method and the application thereof, the air stability of the halide solid electrolyte can be remarkably improved, the cycle performance of an all-solid-state lithium ion battery is improved, the manufacturing process is simple, and the cost is relatively low.

The embodiment of the invention discloses a positive electrode material, a preparation method thereof and application of a sodium battery. The positive electrode material is characterized in that the positive electrode material comprises a layered oxide core and a shell coating the surface of the core, the core comprises Na [alpha] FexMnyMzO2, the shell comprises tunnel-type Na [beta] MnO2, M comprises at least one of Li, Ni, Cu, Mg, Zn, Al or Ti, and 0.66 lt; alpha < = 1, x + y + z = 1, and beta < = 0.30 < = 0.66. According to the positive electrode material disclosed by the invention, the Na [beta] MnO2 with the tunnel type structure is coated outside the inner core with the layered structure, and the positive electrode material is applied to a sodium battery (such as a sodium ion battery), so that the air stability of the inner core with the layered structure can be effectively improved, the internal structure change can be effectively inhibited, the reaction kinetics can be improved, and a stable protection interface can be constructed on the surface; the cycle life is prolonged, and the cycle stability of the battery is enhanced.

The invention discloses a nanoscale lithium oxalate / carbon composite lithium supplement agent, a preparation method and application of the nanoscale lithium oxalate / carbon composite lithium supplement agent in a lithium ion battery. The lithium oxalate powder is prepared into the lithium oxalate saturated aqueous solution, then the amphiphilic surfactant is added, overgrowth of crystals of the lithium oxalate in the drying process can be limited, the particle size of the lithium oxalate is effectively reduced, and therefore the ion transmission path is shortened. Besides, after the carbon material is added, the polar group of the amphiphilic surfactant promotes the uniform distribution of the carbon material, so that a three-dimensional conductive network structure is constructed, the electron transmission path is effectively shortened by the structure, and the conductivity of the material is remarkably improved. The lithium supplement agent prepared by the invention has remarkable electrochemical performance, and the decomposition potential of the lithium supplement agent is successfully reduced to about 4.33 V, which conforms to the working voltage range of a positive electrode material and an electrolyte of a commercial lithium ion battery. The method provided by the invention has the advantages of simple operation and no need of additional introduction of a metal catalyst, and can effectively reduce the raw material cost.

The invention belongs to the technical field of perovskite batteries, and particularly relates to a perovskite precursor and a preparation method thereof. According to the invention, the perovskite precursor is prepared into an emulsion form, Ge < 4 + > is adopted to prepare the perovskite precursor, and the silicon dioxide nano oxide, the additive and the stabilizer are introduced into the emulsion precursor, so that the moisture resistance and hydrophobicity of the perovskite thin film are improved, and tiny liquid drops in the emulsion are used as a template for perovskite crystal growth, so that the perovskite thin film is prepared. The size and form of perovskite crystals are controlled, the silicon dioxide nano oxide can passivate defect states on the surface of perovskite and reduce recombination of electron-hole pairs, and a precursor in the emulsion is also beneficial to passivating surface defects in the curing process, reducing defect state density and improving device performance. The device prepared by using the perovskite precursor prepared by the invention has good photoelectric property and stability.

The application provides a preparation method of a sulfide-based composite solid electrolyte film, comprising the following steps: adding 65-95 parts of a sulfide electrolyte, 1-10 parts of a lithium salt, 3-20 parts of a liquid polyether, 0.5-5 parts of a liquid organic modifier and 0.5-5 parts of a flame retardant into a high-speed blender according to mass fractions, and mixing by high-speed stirring, wherein one of the liquid polyether and the liquid organic modifier contains an amino group, and the other contains an epoxy group; rolling the mixed sample to obtain a thin film sample with a thickness of 20-50 microns; and placing the thin film sample in a vacuum oven for heat treatment to obtain the sulfide-based composite solid electrolyte film. The application also provides a sulfide-based composite solid electrolyte film and application thereof. The sulfide-based composite solid electrolyte film prepared by the preparation method has good film forming performance, and the film thickness can reach 20-50 microns.

The present invention discloses a preparation method and application of a halide solid electrolyte for lithium-ion batteries, and belongs to the field of new energy technology. The preparation method of the solid electrolyte comprises the following steps: S1, ball-milling and mixing a lithium source and a metal halide in a certain stoichiometric ratio to obtain a mixed powder; S2, cross-spreading the mixed powder obtained in step S1 and a certain stoichiometric amount of ammonium salt in multiple layers in a crucible, annealing in a protective atmosphere, and obtaining a target halide solid electrolyte after cooling with the furnace. The present invention also proposes a lithium-ion battery, which consists of a positive electrode sheet, a halide solid electrolyte, a sulfide interlayer and metallic lithium. The method is simple, and the conductivity of the obtained halide solid electrolyte is 0.34mS / cm. The LiNi assembled from the electrolyte 0.83 Co 0.11 Mn 0.06 O 2 |Li 3 YC 6 |Li 6 PS 5 The Cl|Li battery exhibits a first-cycle discharge specific capacity of up to 191.5 mAh / g and a capacity retention rate of 89.5%.

The invention relates to a preparation method of a surface-modified sodium ferric sulfate positive electrode material with good processability and hydrophobicity. The preparation method comprises the following steps: (1) providing a carbon-compounded sodium ferric sulfate precursor; and (2) depositing hydrophobic groups on the surface of the material by using a low-temperature plasma deposition technology to obtain the sodium ferric sulfate positive electrode material with the core-shell structure. A hydrophobic thin shell layer is constructed on the surface of a sodium ferric sulfate precursor material through a low-temperature plasma deposition technology, the air stability, the processing performance and the thermal stability of the material are greatly improved, meanwhile, the stability of a positive electrode structure is enhanced, pulverization of positive electrode material particles in the circulation process is prevented, meanwhile, an inner core is of a carbon composite conductive active network structure, and the performance of the positive electrode material is improved. The transmission of sodium ions is facilitated.

This invention relates to the field of battery technology, and more particularly to a positive electrode lithium replenisher, its preparation method, a positive electrode sheet, and a lithium battery. The aforementioned positive electrode lithium replenisher includes a core and a shell, with the shell covering the surface of the core to isolate the core from the side reaction environment. The core is a lithium-rich material, specifically at least one of Li5FeO4, Li5ReO6, and Li6CoO4. The shell is cobalt boride. This core-shell structured positive electrode lithium replenisher with cobalt boride as the shell effectively coats the core material, improves the air stability of the positive electrode lithium replenisher, reduces residual alkali, and thus enhances the battery's energy density and cycle performance.

The invention discloses an all-solid-state battery positive electrode material. The all-solid-state battery positive electrode material comprises a positive electrode active material and a composite sulfide solid electrolyte, the composite sulfide solid electrolyte comprises a sulfide solid electrolyte matrix and a metal fluoride layer coated on the surface of the sulfide solid electrolyte matrix, and the mass ratio of the positive active material to the composite sulfide solid electrolyte is 7: 3. The sulfide solid electrolyte is coated with a layer of metal fluoride, on one hand, the stable metal fluoride effectively isolates sulfide from being in direct contact with air, the air stability of the sulfide solid electrolyte is greatly improved, and the problem that the sulfide solid electrolyte is sensitive to air is relieved; on the other hand, the metal fluoride coating layer can prevent sulfide solid electrolyte from being in direct contact with the positive electrode material, the instability between the positive electrode material and the electrolyte is relieved, and an effective thought is provided for industrialization of the all-solid-state battery.

The present invention belongs to the technical field of hard carbon materials. The present invention provides a pre-sodiumized hard carbon coated with a coating agent and a pre-sodiumized hard carbon dry-process electrode and a preparation method thereof, wherein phosphorylated biomass and waste plastic powder are subjected to a pre-carbonization reaction to obtain a hard carbon precursor; the hard carbon precursor, waste plastic powder and nano-oxide are carbonized to obtain a hard carbon powder; the hard carbon powder and metallic sodium powder are subjected to a pre-sodiumization reaction under an inert gas to obtain a pre-sodiumized hard carbon; the pre-sodiumized hard carbon and the coating agent are mixed and reacted to obtain a pre-sodiumized hard carbon coated with a coating agent. The pre-sodiumized hard carbon coated with a coating agent, a binder and conductive carbon black are mixed, and the mixture is hot-pressed and coated on a carbon-coated aluminum foil to obtain a pre-sodiumized hard carbon dry-process electrode. The pre-sodiumized hard carbon of the present invention can simultaneously improve the initial charge and discharge efficiency, cycle performance and rate performance of the negative electrode of a sodium ion battery, and has a high sodium storage capacity and good safety performance.

The application relates to the technical field of ceramics and energy storage, in particular to a Li-La-Zr three-site co-doped garnet solid electrolyte ceramic and a preparation method and application thereof, the chemical formula of the Li-La-Zr three-site co-doped garnet solid electrolyte ceramic is Li 6.25 (Ga 0.25 )La 2.5 (Sr 0.5 )Zr 1.5 (Ta 0.5 )O 12 The Li-La-Zr three-site co-doped garnet solid electrolyte ceramic provided by the application has high ionic conductivity and excellent air stability, and can improve the cycle stability and rate performance of a solid-state battery.

The application discloses a kind of miscellaneous anion oxyhalide solid electrolyte and preparation method, application and full solid battery thereof;Belong to solid battery technical field.The electrolyte material chemical formula is Li （3d+2e+2f+g） M m+ b N n+ c (PO4) d (SO4) e (CO3) f (OH) g X (mb+nc) , M is alkaline earth metal, N is one or more of transition metal, rare earth metal and P area metal, X is at least one of F, Cl, Br and I.The twisted Li-X sublattice structure formed by introducing halogen atom of the material of the application significantly reduces lithium ion migration barrier, expands lithium ion transport channel through special angle sharing oxygen network structure, also endows material with excellent mechanical flexibility, and the halogen-rich passivation layer spontaneously formed on the surface of the material makes it show excellent environmental stability;Not only solve the key material bottleneck of solid battery development, more provide solid technical support for promoting new energy industry to higher safety, higher energy density direction development.

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a clay / polyether artificial composite solid electrolyte, which is obtained by polymerizing a precursor solution containing a polyether monomer, a cross-linking agent, an initiator, an electrolyte salt and modified clay, the modified clay is clay which is firstly intercalated by metal M ions and then grafted and modified by a formula 1 # imgabs0 #; the metal M comprises at least one of Li, Na and K; r1 is alkyl of C1 to C6; r2 is a substituted alkyl group with a substituent group; the substituent group comprises at least one of an amino group, an epoxy group, a sulfydryl group, an acryloyloxy group, a vinyl group and an isocyanate group. The invention also discloses the clay / polyether artificial composite solid electrolyte prepared by the preparation method and application thereof. According to the invention, ionic conduction can be improved, and the problem of clay segregation can be improved, so that the electrochemical performance of the composite solid electrolyte can be remarkably improved.

The invention provides a sodium ferric sulfate positive electrode material and a preparation method thereof, a sodium ion battery and electric equipment, and relates to the technical field of new energy. The preparation method of the sodium ferric sulfate positive electrode material comprises the following steps: mixing ferrous sulfate, sodium sulfate, boron nitride and a carbon material through ball milling to obtain a mixture; and sintering the mixture in an inert atmosphere to obtain the sodium ferric sulfate positive electrode material. The preparation method disclosed by the invention is simple in process and convenient for expanded production, and the synthesized sodium ferric sulfate has relatively high conductivity, relatively good sodium storage performance and relatively good rate capability. According to the sodium ion battery and the electric equipment, due to the fact that the sodium ferric sulfate positive electrode material prepared through the method is adopted, the first charge capacity can reach 102.27 mAh / g, the first discharge capacity can reach 100.03 mAh / g, the capacity retention rate can reach 96.24% after 1000 cycles under the 5C multiplying power, and the capacity retention rate can reach 81.41% under the 20C multiplying power.

The invention belongs to the technical field of chemical power sources, and particularly relates to application of liquid nitrogen rapid cooling in preparation of a nickel-manganese-based sodium ion battery positive electrode material. The sodium-ion battery positive electrode material is synthesized by taking Ni0. 25Mn0. 75 (OH) 2 as a precursor, adding a sodium source and adopting a high-temperature solid-phase method, and the material subjected to high-temperature calcination by liquid nitrogen is rapidly cooled during cooling, so that the local chemical environment of the sodium-ion battery positive electrode material is obviously changed, and the performance of the sodium-ion battery positive electrode material is improved. Therefore, the prepared nickel-manganese-based sodium-ion battery positive electrode material shows excellent electrochemical performance in a wide potential range of 2.0-4.3 V and still has high specific discharge capacity after 100 cycles, and meanwhile, the air stability of the material is improved.

The invention relates to a tunnel type sodium manganate material as well as a preparation method and application thereof. The tunnel-type sodium manganate material is in a nanorod shape, and the diameter of the tunnel-type sodium manganate material is 50 nm to 10 [mu] m, preferably 200 nm to 500 nm; the length is 0.1 mu m to 50 mu m, preferably 1 mu m to 10 mu m; the chemical composition is Na < 0.44-x > KxMnO2, x is more than or equal to 0 and less than or equal to 0.2, and preferably, x is more than or equal to 0

The invention discloses a lithium supplementing material and a preparation method thereof, a positive electrode material and a secondary battery, the lithium supplementing material comprises an organic lithium salt, the chemical formula of the organic lithium salt comprises Li < x > < 1 > H < x > < 2 > CyS < z >, x1 > 0, 5 > = x2 > = 0, y > = 1, and z > = 1. The lithium supplementing material has the advantages of good air stability, no gas production and no residue.

The invention discloses a method for coating a sodium ion layered oxide positive electrode material by a wet process, which comprises the following steps: S1, dispersing a sodium ion battery layered oxide positive electrode material in a dispersing agent, and then adding a buffer solution containing metal organic salt in a heating and stirring state to obtain a mixed solution; s2, dropwise adding a certain amount of ammonia water into the mixed solution, continuously stirring, and carrying out hydrolysis and coating; s3, after coating is finished, filtering, washing, drying, grinding and calcining are conducted, and the composite material is obtained. According to the invention, wet coating is carried out by adopting a method of controlling hydrolysis of the metal organic salt in the alcohol solvent with ammonia water, a uniform nanoscale coating layer is formed on the surface of the layered oxide positive electrode material of the sodium-ion battery, and then the coating layer is converted into an oxide coating layer through heat treatment, so that the reaction is effectively controlled.

An object of the present invention is to improve the air stability of a conventional sulfide-based solid electrolyte. The present invention relates to: a solid electrolyte having an argyrodite-type crystal structure doped with a cation, in which the ratio (r / rs) of the ion radius (r) (unit:) of the cation to the ion radius (rs) (unit:) of S2-is 0.20-0.30; and to an all-solid-state battery comprising the solid electrolyte.

This invention provides a core-shell structured sulfide electrolyte, its preparation method, and a solid-state battery. The core-shell structured sulfide electrolyte includes a sulfide solid electrolyte and a shell layer coating the surface of the sulfide solid electrolyte; the shell layer is composed of hydrophobic silica; wherein the hydrophobic silica is obtained by hydrophobic modification of silica with a modifier; the modifier includes a coupling agent for hydrophobic modification. This core-shell structured sulfide electrolyte exhibits higher air stability and chemical stability, which is beneficial for the application of sulfide electrolytes in solid-state batteries.

The invention discloses a garnet type solid electrolyte with an interface modification layer, a preparation method and application of the garnet type solid electrolyte in a lithium metal symmetric battery, and belongs to the technical field of lithium metal symmetric batteries. The interface modification layer is a Ga2O3 modification layer which is constructed on the surface of the garnet type solid electrolyte and has the thickness of 5-1000 nm. The preparation method comprises the following steps: depositing the Ga2O3 modification layers on the surfaces of the two sides of the garnet type solid electrolyte by using a radio frequency magnetron sputtering technology; the crystallinity, the O vacancy and the thickness of the modification layer are accurately regulated and controlled by controlling the temperature, the O2 partial pressure and the deposition time. The interface modification layer provided by the invention can improve the interface contact between an electrolyte material and lithium metal, enhance the wettability of the electrolyte to lithium, reduce the interface resistance and improve the critical current density of the lithium symmetric battery; meanwhile, due to the existence of the compact modification layer, H2O and CO2 in the air are prevented from being in contact with the electrolyte, and the air stability of the electrolyte is enhanced.

This invention discloses a composite solid electrolyte and its preparation method, relating to the field of battery technology. The preparation method of the composite solid electrolyte includes the following steps: mixing raw materials for preparing a sulfide solid electrolyte and bismuth iodide, then sintering at a preset temperature for a preset time to obtain a bismuth iodide-doped sulfide solid electrolyte; coating the surface of the bismuth iodide-doped sulfide solid electrolyte with barium titanate to obtain the composite solid electrolyte; the mass of bismuth iodide accounts for 3% to 8% of the total mass of the raw materials for preparing the sulfide solid electrolyte. This invention uses bismuth iodide to dope and modify the sulfide solid electrolyte, improving air stability while enhancing the coating performance of barium titanate and reducing the impact of barium titanate coating on the ionic conductivity of the sulfide solid electrolyte. Simultaneously, barium titanate coating can further improve air stability and mitigate bismuth iodide doping defects, i.e., preventing bismuth iodide from absorbing moisture and preventing iodide ions from being oxidized by air.

The invention discloses a two-dimensional material-based composite solid electrolyte with a vertical arrangement structure and a preparation method of the two-dimensional material-based composite solid electrolyte. The preparation method comprises the following steps: preparing a two-dimensional material film by adopting dispersion liquid of two-dimensional nanosheets; polymer-containing slurry is prepared from a polymer, a lithium salt and the two-dimensional nanosheet; alternately carrying out spin coating of the slurry containing the polymer and pasting of the two-dimensional material film for several times to obtain a block body in which the polymer-containing film and the two-dimensional material film are alternately arranged for several layers; and carrying out at least drying, cold pressing and slicing on the block to obtain the two-dimensional material-based composite solid electrolyte with the vertical arrangement structure. The composite solid electrolyte has the advantages of high ionic conductivity at room temperature, wide electrochemical stability window, excellent air stability, excellent performance in a wide temperature range and the like.

This invention proposes an all-solid-state lithium-ion battery and its application. The all-solid-state lithium-ion battery includes: a positive electrode; a modified lithium-based composite negative electrode, the modifying material including metal fluorides; and a solid electrolyte membrane disposed between the positive electrode and the modified lithium-based composite negative electrode, wherein the solid electrolyte membrane includes a sulfide electrolyte with the chemical formula Li. a P 1‑b M b S c O d X e , of which 5

The present invention relates to the technical field of photovoltaic device preparation, and in particular to a preparation method, product and application of a perovskite microcrystal. The perovskite microcrystal has a tetragonal crystal structure; the defect state density is 10 10 ‑10 13 cm ‑3 ; The general structural formula is ABX3, wherein A is at least one of MA, FA, and Cs; B is Pb; and X is at least one of I, Br, and Cl. The perovskite microcrystals maintain full absorption in the visible light range of 300-850nm, have good stability, and have good photoelectric properties. The present invention uses an anti-solvent-assisted inversion crystallization method to quickly prepare high-quality hexahedral perovskite microcrystals at a relatively low temperature. The micron-sized single crystals have a tetragonal crystal structure, and their production cycle is much shorter than that of bulk single crystals, and the raw material utilization rate is higher, which is more suitable for industrial production.

This application belongs to the field of lithium-ion battery technology, and specifically discloses an air-stable solid electrolyte. The solid electrolyte includes a core and a hydrophobic layer coating the surface of the core. The core comprises sulfide particles, and the thickness of the hydrophobic layer is 5–30 nm. The solid electrolyte according to the embodiments of this application has a surface-coated hydrophobic layer with low surface activity, exhibiting strong air stability and enabling the fabrication of solid-state batteries with excellent battery performance.

This application discloses a cathode material, its preparation method, and an all-solid-state battery. It includes a substrate and a first coating layer and a second coating layer sequentially coated on the surface of the substrate. The substrate is a phosphorus-doped spinel-type lithium nickel manganese oxide. The first coating layer includes an oxygen-doped halide electrolyte. The second coating layer includes an Sb / O co-doped argentite-germanium sulfide. The cathode material provided by this application has the advantage of synergistically improved structural stability, interfacial stability, and air stability.

The invention provides a gallium oxide doped argyrodite solid electrolyte as well as a preparation method and application thereof. The chemical formula of the gallium oxide doped argyrodite solid electrolyte is Li < 6.1 > P < 0.95 > Ga < 0.05 > S < 4.925 > O < 0.075 > Cl. The solid electrolyte is prepared by a ball milling method and a solid phase sintering method, the successful doping of Ga2O3 is proved by XRD (X-Ray Diffraction), Raman spectrum, XPS (X-Ray Photoelectron Spectroscopy) and other technologies, and meanwhile, the doped electrolyte LPSC-0.05 shows relatively high ionic conductivity and air stability. In addition, a cyclic voltammetry (CV) test, a critical current density (CCD) test and a constant current charging and discharging test are performed aiming at the problem of a negative electrode interface, and the interface compatibility is superior to that of an undoped sample. And finally, CV, impedance, rate and long-cycle tests are carried out on the all-solid-state battery, and the battery assembled by using the LPS-0.05 can show better performance.

The present invention relates to a sodium iron sulfate material and a preparation method and application thereof, belonging to the field of energy storage technology. The sodium iron sulfate material provided by the present invention comprises a sodium iron sulfate crystalline phase, and at least a portion of the surface of the sodium iron sulfate crystalline phase is coated with a sodium iron sulfate amorphous phase. The present invention coats at least a portion of the surface of the sodium iron sulfate crystalline phase with a highly stable sodium iron sulfate amorphous phase, effectively isolating the contact between the internal sodium iron sulfate crystalline phase particles and the air, and improving the air stability of the sodium iron sulfate material; and the amorphous amorphous phase provides abundant vacancy defects, making metal migration easier than in the crystalline phase, thereby promoting electrode kinetics. The sodium iron sulfate material provided by the present invention has good air stability, rate performance and long cycle performance. The material can be left in the air for a long time, and the electrochemical performance after being left for 12 months has no obvious decline. The material can be used to prepare a high-performance sodium ion battery.