700results about "Zirconium compounds" patented technology

The invention relates to the technical field of lithium ion batteries, and provides a lithium cobalt oxide composite material which comprises a core body and a coating layer coating the core body, the core body comprises O2-phase lithium cobalt oxide, and the O2-phase lithium cobalt oxide is doped with an element M; the coating layer comprises an oxide containing an N element; the M element comprises at least one of Al, Mg, W, Ti, La, Zr, Ni, Mn and Y; n comprises at least one of Al, Mg, Y, W, Nb, La, Zr, Ti and P. The lithium cobalt oxide composite material provided by the invention is used as a positive electrode material of a lithium ion battery, and the cycling stability of the lithium ion battery under high potential is improved.

The invention provides a coated modified high-nickel ternary positive electrode material, a preparation method and a lithium ion battery, the coated modified high-nickel ternary positive electrode material comprises a high-nickel ternary matrix and a coating layer containing an oxide solid electrolyte, the coating layer is coated outside the high-nickel ternary matrix and accounts for 1%-3% of the mass of the high-nickel ternary matrix; the oxide solid electrolyte comprises Li < 3x > La < 2 / 3-x > TiO < 3 > (0 lt; x < = 0.16), Li < 7 > La < 3 > Zr < 2 > O < 12 >, Li < 1 + y > Al < y > Ti < 2-y > (PO < 4 >) < 3 > (0 lt; y < = 0.5); the ionic conductivity of the oxide solid electrolyte is greater than or equal to 1 * 10 <-4 > S / cm. The selected oxide solid electrolyte has high ionic conductivity and electronic insulativity, a rapid lithium ion transmission channel can be provided, interface side reaction can be inhibited, the rate capability and the cycling stability of the material can be remarkably improved, and when the oxide solid electrolyte forms a coating layer, the coating layer is not prone to deformation, and the service life of the material is prolonged. The interface bonding strength with a high-nickel ternary matrix can be improved through chemical bonding, the interface impedance can be remarkably reduced, and the dynamic performance of the material is improved.

The invention relates to a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a positive plate and a battery, and belongs to the technical field of methods or devices for directly converting chemical energy into electric energy. The lithium manganese iron phosphate positive electrode material comprises an inner core, a first coating layer arranged on the surface of the inner core and a second coating layer arranged on the surface of the first coating layer, the inner core is lithium manganese iron phosphate I, the first coating layer comprises lithium manganese iron phosphate II, and the second coating layer comprises a carbon material and an inorganic solid electrolyte. The lithium manganese iron phosphate positive electrode material not only can endow a battery with relatively high energy density, but also can endow the battery with excellent cycle performance.

The invention discloses a double-site doped titanium lithium ion sieve adsorbent as well as a preparation method and application thereof. The adsorbent is a lithium removal product of a double-site doped titanium lithium ion sieve adsorbent precursor, the chemical general formula of the double-site doped titanium lithium ion sieve adsorbent precursor is Li (2-x) MxTi (1-y) NyOz, M is at least one of Na < + >, K < + >, Zn < 2 + >, Co < 2 + >, Ni < 2 + >, Mg < 2 + > and Al < 3 + > and occupies Li site, N is at least one of Cr < 3 + >, Fe < 3 + >, Zr < 4 + >, Nb < 5 + >, Ta < 5 + >, V < 5 + >, Mo < 6 + > and W < 6 + > and occupies Ti site, x is larger than or equal to 0.001 and smaller than or equal to 0.5, and y is larger than or equal to 0.001 and smaller than or equal to 0.5. Metal cations are introduced to replace Li sites and Ti sites at the same time, Li site substitution enlarges interlayer spacing and improves Li < + > diffusion rate, Ti site substitution regulates local chemical bond and electron distribution, stabilizes lattice structure and enhances electron conduction, and through double-site doping, 'ion-electron 'double channels are constructed, so that a collaborative optimization effect is achieved. The double-site doped titanium lithium ion sieve adsorbent disclosed by the invention is applied to adsorption and extraction of lithium in a Bayer process sodium aluminate solution, and the adsorbent shows excellent adsorption performance.

The invention provides a positive electrode active material as well as a preparation method and application thereof. The positive electrode active material comprises secondary particles consisting of primary particles, each primary particle comprises an inner core and a carbon coating layer arranged on at least part of the surface of the inner core; the inner core comprises a solid solution formed by lithium iron manganese phosphate and lithium manganate; the primary particles comprise primary particles A and primary particles B, the particle size of the primary particles A is 50-200nm, and the median particle size D50 is 80-120nm; the particle size of the primary particles B is 400-800 nm, and the median particle size D50 is 500-600 nm. The positive electrode active material has relatively high powder compaction density and ion transmission capability, and the electrochemical performance and energy density of the lithium ion battery can be effectively improved.

The invention belongs to the technical field of halide solid-state electrolyte, and relates to a high-conductivity and high-lithium-stability modified halide solid-state electrolyte material constructed by solid source plasma, and a preparation method and application of the high-conductivity and high-lithium-stability modified halide solid-state electrolyte material. According to the preparation method, a halide solid electrolyte is taken as a matrix, halogenated ammonium salt is taken as a solid source, and the halide solid electrolyte is subjected to synergistic doping modification of elements such as nitrogen, fluorine / chlorine / bromine and the like by utilizing a plasma technology, so that the modified halide solid electrolyte material is obtained. The modified halide solid electrolyte material shows excellent conductivity and lithium-lithium symmetrical battery performance, and has a wide market application prospect. Meanwhile, the preparation method provided by the invention is simple, rapid, efficient and convenient, is easy to control, and contributes to promoting the development and application of the high-performance halide solid electrolyte material.

The invention provides a surface-modified sulfide electrolyte and a preparation method thereof, and an all-solid-state battery, the surface-modified sulfide electrolyte comprises a sulfide electrolyte and a modification layer coated on the surface of the sulfide electrolyte, the chemical general formula of the modification layer is LiaMbNcXd, 0 < = a < = 3, 0 < = b < = 1, 0 < = c < = 1, 0 < = d < = 6, and 0 < = c < = 1. M is at least one element of magnesium, aluminum, calcium, iron, zirconium, niobium, tantalum, tungsten, gadolinium, yttrium, indium, hafnium, lanthanum and ytterbium, and X is at least one element of oxygen, sulfur, fluorine, chlorine, bromine and iodine. According to the surface-modified sulfide electrolyte, the modification layer with high ionic conductivity and high oxidation potential is coated outside the sulfide electrolyte, so that when the surface-modified sulfide electrolyte is applied to a positive electrode of an all-solid-state battery, the modification layer can improve the oxidation potential of the electrolyte on the premise of not reducing the ionic conductivity of the electrolyte; the effects of improving the interface stability between the positive electrode active material and the sulfide electrolyte and further improving the cycle performance of the battery are achieved.

The invention relates to the technical field of lithium ion batteries, in particular to a composite lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The composite lithium-rich manganese-based positive electrode material is of a three-layer structure and sequentially comprises a lithium-rich manganese-based oxide positive electrode material matrix, a first coating layer and a second coating layer from inside to outside, the first coating layer is a mixture of halide solid electrolyte and lithium-containing oxide; and the second coating layer is an oxide solid electrolyte. The conductivity of a contact interface with a positive electrode material can be improved, the resistance is reduced, the moisture absorption degradation of halide is inhibited, the packaging difficulty is reduced, and the cycle performance of the halide-added solid electrolyte after moisture absorption is improved.

A positive electrode material includes: a positive electrode active material; a coating layer covering at least part of the surface of the positive electrode active material; and a second solid electrolyte. The coating layer includes a first solid electrolyte. The first solid electrolyte includes Li, M1 and F. M1 is at least one selected from the group consisting of Ti, Al and Zr. The second solid electrolyte includes Li, M2, O and X. M2 is at least one selected from the group consisting of Ta and Nb. X is at least one selected from the group consisting of F, Cl, Br and I.

The invention belongs to the technical field of solid electrolytes, and relates to a selenium-doped sulfide solid electrolyte as well as a preparation method and application thereof. The general chemical formula of the sulfide solid electrolyte is Li < 6 + / -iP < 1-x > MxS < 5-y > SeyX, i is greater than or equal to 0 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and less than 1, M is one or more of Zr, Ta, Nb, Mo, Bi, In and Y, and X is one or more of Cl, Br and F. According to the invention, the selenium element with larger ionic radius and lower electronegativity is introduced to replace the sulfur element, and Zr, Ta, Nb, Mo, Bi, In or Y elements are introduced, so that the doped sulfide solid electrolyte system has excellent stability to air, organic solvents and lithium while ensuring high ionic conductivity, and the assembled all-solid-state battery shows excellent cycle stability.

The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a preparation method thereof and a battery. The composite positive electrode material comprises a positive electrode substrate, a fast ion conductor layer and a halide layer, the positive electrode substrate comprises a doped lithium cobalt oxide material; the fast ion conductor layer is positioned on the surface of the positive electrode substrate and comprises an oxide of a metal element Q with a spinel phase; the halide layer is located on the surface of the fast ion conductor layer and comprises element lithium, metal element M and halogen X. Through coordination and cooperation of the matrix material, the fast ion conductor layer and the halide layer, the structural stability and the surface morphology of the material can be effectively improved, the defects of the material are overcome, and the composite positive electrode material has excellent conductivity and has excellent cycling stability and rate capability at high temperature and / or high voltage, so that the battery has high safety performance.

The production device comprises a base, a reaction barrel is fixedly arranged on the base, a mounting frame is fixedly arranged on the outer side of the reaction barrel, a motor is fixedly connected to the top end of the mounting frame, and a stirring device for stirring basic zirconium sulfate and tartaric acid is arranged in the reaction barrel. The feeding parts are sequentially added into the reaction barrel, and a discharging part for discharging reacted liquid is arranged in the reaction barrel; through the staggered and periodic coincidence design of discharging grooves of the inner barrel and the outer barrel in the feeding part, the rotating rod is matched to drive the outer barrel to spirally move downwards, accurate and quantitative adding of the basic zirconium sulfate solution is achieved, meanwhile, the adding time and flow of the tartaric acid solution are automatically controlled through magnetic ring adsorption of the upper barrel and the outer barrel and stored energy release of the first spring, and the feeding efficiency is improved. Manual intervention is reduced, efficiency loss caused by step-by-step feeding is avoided, and the preparation efficiency of the water repellent agent is remarkably improved.

The invention relates to a purple-light-excited blue-light fluorescent material for a sunlight-like LED (light-emitting diode) as well as a preparation method and application of the blue-light fluorescent material. The chemical expression of the fluorescent material is Ca2LuZr2Al1. 5Ga1. 5O12: xCe < 3 + >, wherein x is more than or equal to 0.02 and less than or equal to 0.07. The blue light fluorescent material for the purple light excitation type sunlight LED is a brand new and unreported purple light excitation Ce < 3 + > doped oxide blue light emission fluorescent material, the fluorescent powder has a wide excitation band, the effective absorption range covers 300-450 nm, the fluorescent powder can be excited by purple light, and blue light with the central wavelength being 485 nm is emitted. The fluorescent powder has the advantage of stable physical and chemical properties, can be prepared by adopting a conventional solid-phase reaction method, has the characteristics of simple preparation process and facilitation of industrial production, and can be used as a good candidate material for wide application of a next-generation full-spectrum illumination white light LED (light-emitting diode). The fluorescent powder can be completely and well matched with the existing purple light chip, meets the commercial market requirements, and is suitable for application of white light LEDs, sunlight-like LEDs, full-spectrum LEDs and the like.

The invention discloses a halide electrolyte electrode material, a composite positive electrode, an all-solid-state battery and a preparation method of the all-solid-state battery. The chemical formula of the halide electrolyte electrode material is Li Zr T < c > Cl < d >, the preparation method of the halide electrolyte electrode material comprises the following steps: mixing titanium chloride, zirconium chloride and lithium chloride according to a stoichiometric ratio to obtain precursor powder, and placing the precursor powder in a first protective atmosphere for ball milling to obtain premixed amorphous precursor powder; and placing the premixed amorphous precursor powder in a second protective atmosphere, and calcining at 200-400 DEG C, thereby obtaining the product. And mixing the halide electrolyte with commercial lithium iron phosphate and conductive carbon to obtain the composite positive electrode. The all-solid-state battery assembled based on the positive electrode material shows higher energy density. The material provided by the invention has good structural stability and excellent charge-discharge cycle performance.

The invention belongs to the technical field of zirconium oxychloride preparation, and relates to a method and device for alkali fusion continuous production in the zirconium industry, and the method comprises the following steps: in a closed space, adding a certain amount of alkali metal hydroxide into an alkali fusion pan, preheating for 10-20 minutes at 350-450 DEG C, then heating for 10-40 minutes at 550-650 DEG C, and then cooling to room temperature to obtain the zirconium oxychloride. The method comprises the following steps of: adding zircon sand into an alkali fusion pot according to the ore-alkali mass ratio of 1: (1.2-1.5), adding the zircon sand for 10-20 minutes, keeping the temperature at 600-650 DEG C for 20-60 minutes, and finally cooling the alkali fusion pot to 50 DEG C within 120-240 minutes. The device comprises a tunnel kiln, and a preheating section, a heating section, a feeding section, a heat preservation section and a cooling section are arranged in the tunnel kiln. According to the invention, the labor intensity of workers can be reduced, the working environment can be improved, and the production efficiency and the zircon sand conversion rate can be improved.

The invention discloses an oxide solid electrolyte coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium manganese iron phosphate preparation. The lithium manganese iron phosphate battery comprises a lithium manganese iron phosphate core and an oxide solid electrolyte coating layer, the oxide solid electrolyte coating layer comprises Li < 7 > La < 3 > Zr < 2 > O < 12 > (LLZO), Li < 6.75 > La < 3 > Zr < 1.75 > Ta < 0.25 > O < 12 > (LLZTO, Li < 3 > x La < 2 / 3-x > TiO < 3 > (LLTO), Li < 3 > BO < 3 > (LBO) and Li < 1 + x > Al < x > Ti < 2-x > (PO4) < 3 > (LATP); the lithium manganese iron phosphate core is LiMnxFe1-xPO4, wherein x is more than or equal to 0.5 and less than or equal to 0.8; the existing main problem of lithium manganese iron phosphate is solved, the comprehensive performance is improved, and the commercial application is promoted.

To provide a conductive paste for an internal electrode of a layered ceramic capacitor, which is capable of maintaining relatively high coverage even if the internal electrode constitutes a thin layer.SOLUTION: Provided is a conductive paste for forming internal electrodes 4 and 5 of a layered ceramic capacitor 1 fabricated through a firing step. The conductive paste includes conductive metal powder, ceramic powder, an organic solvent, and an organic binder. The conductive metal powder contains a silver / palladium alloy. At least a portion of the ceramic powder comprises an ABO3 type oxide having a specific ion radius in which the ratio of the ion radius in the 6-coordination of an element at the A site in ABO3 with respect to the ion radius in the 6-coordination of a metal element contained in the conductive metal powder is 0.96 or more and 1.10 or less.SELECTED DRAWING: Figure 1

To provide a highly dispersible sol containing metal oxide particles and a plurality of polymerizable functional group-containing silanes, and a varnish containing a thermosetting or photocurable resin using the same.　Provided is a metal oxide sol containing a silane compound and metal oxide particles, wherein the silane compound is represented by formula (1): (in formula (1), R1 each independently represent an alkoxy group, an acyloxy group, or a halogen group; R2 each independently are an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 30 carbon atoms; R3 is a hydrogen atom or a methyl group; A1 is an alkylene group; A2, A3, and A4 each independently are a methylene group or an oxygen atom; one of A2, A3, and A4 is an oxygen atom; and n is an integer of 1 to 3.). The varnish contains the metal oxide sol and a thermosetting or photocurable resin. The varnish is used for nanoimprinting.

The invention belongs to the field of battery materials, and particularly relates to a high-adhesion battery diaphragm binder, slurry, a diaphragm and a preparation method of the high-adhesion battery diaphragm binder, and the high-adhesion battery diaphragm binder based on an acrylate copolymer is prepared through a specific reaction. And then, mixing the binder with two inorganic nano materials, namely a lithium-doped aluminum borosilicate nanowire and a sulfo-functionalized lithium zirconate titanate nanosheet, boehmite and / or aluminum oxide and the like, so as to prepare the high-adhesion diaphragm coating slurry. Wherein the nanowires provide mechanical enhancement and chemical crosslinking points, and the nanosheets improve the interface adhesion and the ionic conductivity. And finally, coating the slurry on the surface of a polypropylene diaphragm, and performing multi-stage drying and heat treatment to obtain the composite diaphragm. The diaphragm has extremely high coating bonding strength, excellent electrolyte wettability and good thermal dimensional stability and ionic conductivity, and is particularly suitable for high-energy-density lithium ion batteries and sodium ion batteries.

The invention provides a positive electrode material and a preparation method thereof, a battery and an electric device. The positive electrode material comprises a substrate and a coating layer, the coating layer coats at least one part of the surface of the substrate, the substrate comprises spinel lithium manganese oxide and layered lithium manganese oxide distributed on the surface layer of the spinel lithium manganese oxide, the chemical formula of the layered lithium manganese oxide comprises LicMndOe, c is greater than or equal to 1 and less than or equal to 3, c / d is greater than 0.5, (2e-c) / d is greater than or equal to 3 and less than or equal to 4, and the coating layer comprises a solid electrolyte.

The invention discloses a preparation method of a Zr-based halide electrolyte with high ionic conductivity, and belongs to the technical field of solid electrolyte preparation. According to the technical scheme, LiCl, ZrCl4, CuCl2 and Li2O are mixed and then subjected to high-speed ball milling, and the Zr-based halide electrolyte Li2. 1Zr0. 95Cu0. 05Cl4. 4O0. 8 with the high ionic conductivity is obtained, the ionic conductivity of the Zr-based halide electrolyte is as high as 2 * 10 <-3 > S cm <-1 >, and the Zr-based halide electrolyte has excellent rate capability and long cycle stability when being applied to a solid-state battery. The preparation method is simple, and the product has excellent performance and great market application potential.

The invention provides a positive electrode precursor, a preparation method of the positive electrode precursor, a positive electrode material and a preparation process of the positive electrode material. The positive electrode precursor comprises a phosphorus-doped seed crystal, a phosphorus-doped layer coated outside the phosphorus-doped seed crystal, and a zirconium-rich shell layer coated outside the phosphorus-doped layer, and the mass fraction of doped phosphorus in the phosphorus-doped seed crystal is greater than the mass fraction of doped phosphorus in the phosphorus-doped layer. In the positive electrode precursor provided by the invention, due to introduction of gradient concentration doping of phosphorus, separation of lattice oxygen and mixed arrangement of cations are inhibited, the structural stability of the positive electrode material is enhanced, and the risk that the positive electrode material generates microcracks in the circulation process is reduced; in addition, due to the coating of the zirconium-rich shell layer, not only is the residual alkali reduced, but also the corrosion resistance and the stability of the positive electrode precursor are improved; therefore, the battery prepared from the positive electrode precursor provided by the invention shows relatively high first charge-discharge efficiency and rate capability and excellent cycle stability.

Disclosed in the present application are a lithium replenishing additive and a preparation method therefor, a positive electrode slurry and a battery. The lithium replenishing additive comprises: an inner core, the inner core satisfying the chemical formula LixM1yM21-yO6, wherein 6≤x≤8, 0<y<1, M1 is at least one of Zr, Nb, Sb, Bi, Ru, Ta, Sn, Hf, Ir, Pr, Pt and Np, and M2 is at least one of W, Ge, Ca, Ce, K and Ta; and a coating layer, the coating layer being at least provided on part of the surface of the inner core, the coating layer comprising a lithium-containing metal oxide and a carbon material, and the lithium-containing metal oxide satisfying the chemical formula LiaMbOc, wherein 1.8≤a≤2, 0.7≤b≤1.1, 2.8≤c≤3 and M comprises Ti and / or Zr. The lithium replenishing additive exhibits a diffraction peak intensity S1 relative to an X-ray within the 2θ diffraction angle of 20.1°-20.3° and exhibits a diffraction peak intensity S2 relative to the X-ray within the 2θ diffraction angle of 17°-17.3°, S1 / S2 being 0.02-0.05.

The present invention relates to an all-solid-state battery positive electrode active material comprising: an inner core comprising a layered lithium transition metal oxide; and a coating layer disposed on the inner core and including a lithium ion conductive oxide; a secondary particle formed by aggregating a plurality of primary particles, the primary particles having a flake or needle shape and an average thickness of 50 nm or less; in X-ray diffraction spectrum analysis, the peak width at half maximum (FWHM) (110) of the (110) plane diffraction peak is 0.2 or less.

The present invention provides a method for manufacturing a dental prosthesis in which defective baking of a porcelain material is suppressed by using a zirconia composite sintered body that contains Nb2O5 and / or Ta2O5. The present invention relates to a method for manufacturing a dental prosthesis, the method comprising a step for performing a heat treatment or a polishing treatment as a pretreatment on a zirconia composite sintered body that contains Nb2O5 and / or Ta2O5, and a step for building up a porcelain material on the pretreated zirconia composite sintered body and performing firing.

The invention provides a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment. The positive active material comprises a substrate, the coating material comprises a compound as shown in a formula II: La [alpha] Zr [beta] M [gamma] M '[delta] O [epsilon]; wherein M comprises at least one element of Li, Na, Ca, Mg, Ba and Sr, M'comprises at least one element of Al, Ti, Sn, Nb, Ta, W and Mo, alpha is larger than 0 and smaller than or equal to 3, beta is larger than 0 and smaller than or equal to 2, gamma is larger than or equal to 0 and smaller than 0.5, delta is larger than or equal to 0 and smaller than 0.5, and epsilon is larger than or equal to 5 and smaller than or equal to 10. In an X-ray diffraction pattern of the coating material, the half-peak width of a diffraction peak (222) is FWHM (222), and FWHM (222) is more than or equal to 0.3 and less than or equal to 0.53. Therefore, the coating material is relatively low in thermal conductivity, can form physical isolation on the surface of a multi-element material, and can effectively adsorb active oxygen removed from a high-lithium-removal-state matrix material, reduce side reaction between a matrix and an electrolyte and reduce a heat release peak value of a positive electrode active material, so that the thermal stability and the cycling stability of a battery are improved, and the service life of the battery is prolonged. The safety performance of the battery is improved.

A mixed ionic-electronic conductor ceramic, comprising Ag-modified LLZTO ceramic. Further provided is a preparation method for the mixed ionic-electronic conductor ceramic, comprising the following steps: adding LLZTO ceramic to a solution containing a soluble silver salt and a reducing reagent to obtain silver oxide, and then reacting the silver oxide under the action of the reducing reagent to prepare the Ag-modified LLZTO ceramic. Further provided is a composite solid-state electrolyte, comprising the mixed ionic-electronic conductor ceramic, a lithium salt and a polymer. Further provided are a battery electrode material, comprising the mixed ionic-electronic conductor ceramic; and a battery, comprising the mixed ionic-electronic conductor ceramic or the solid-state electrolyte. When being used for electrode materials, said modified ceramic can achieve the effects of transporting both electrons and ions, thereby improving the dynamics of electrodes and achieving a good prospect of application in the field of batteries.

The invention provides a composite positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the method, on the basis of a coprecipitation-solid phase reaction, different complexing agent concentrations and rotating speeds are set in the two-stage coprecipitation process to obtain a composite positive electrode material precursor, and then a fluxing agent is added in the subsequent solid phase sintering process, so that the LLZO solid electrolyte is tightly coated on the surface of the high-nickel ternary positive electrode material. According to the synchronously synthesized high-nickel ternary / LLZO composite positive electrode material provided by the invention, the LLZO solid electrolyte and the high-nickel ternary material are in closer contact and more uniform coating, so that the direct contact between the electrolyte and high-activity Ni < 4 + > is prevented while the lithium ion transmission kinetics is improved, the generation of a rock salt phase is reduced, and the service life of the lithium ion battery is prolonged. And the garnet type LLZO electrolyte can enhance the phase change reversibility of the high-nickel ternary material through a lithium supplement strategy, so that the composite positive electrode material with high rate performance and high cycle stability is obtained.

The invention discloses a modified solid-state electrolyte and a preparation method and application thereof, and relates to the field of solid-state batteries, in 300 crystal face grain size distribution of the modified solid-state electrolyte, Kn90 = (Ln90-Ln10) / Ln50, and Kn90 is more than or equal to 0.5 and less than or equal to 1.7; wherein Ln10 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 10%, and Ln50 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 50%; ln90 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 90%. According to the invention, the modified solid electrolyte has excellent ionic conductivity, good air stability, interface stability to metal lithium and relatively high oxidation potential stability.

Provided are a method for selectively removing enriched and segregated elements on the surface of a perovskite-based air electrode, and the use thereof. The method comprises: treating a perovskite-based air electrode or electrode powder in an alkali liquor, and then washing and drying same, wherein the concentration of the alkali liquor is 0.01-10 mol L-1; the pH value of the alkali liquor is greater than 7; and the treatment time is 1-600 min. The method greatly increases the active sites on the surface of the electrode, significantly improves the intrinsic activity, and also improves the stability and water resistance of the electrode. The method can effectively improve the peak power density of a solid oxide fuel cell and the current density of a solid oxide electrolytic cell, and can also improve the long-term stability of the cell and the electrolytic cell. The air electrode obtained by means of the method is used in the solid oxide fuel cell and the solid oxide electrolytic cell.