1843 results about "Perovskite (structure)" patented technology

Provided is a laminate capable of electrolyzing an oxygen compound gas represented by CO2 with high conversion efficiency and suppressing deterioration in electrolytic performance. In this laminate having a structure in which an electrolyte layer is sandwiched between an anode catalyst layer and a cathode catalyst layer, a perovskite oxide and CuFe2O4 are contained in the cathode catalyst layer, and the content of CuFe2O4 in the cathode catalyst layer is at least 10 mass%.

The invention belongs to the technical field of solar cells, and particularly relates to a fluorinated biguanide salt synergistically passivated perovskite solar cell and a preparation method thereof. The method comprises the following steps: S1, coating the surface of a perovskite light absorption layer with a fluorinated biguanide hydrochloride solution to form a synergistic layer; coating the surface of the synergistic layer with a halogenated phenylethylamine solution to form a synergistic passivation layer; and S2, arranging an electron transport layer and a hole blocking layer on the surface of the passivation layer. According to the invention, the synergistic passivation layer is introduced in the preparation process of the perovskite solar cell. The introduction of the fluorinated biguanide salt passivation layer can modify the perovskite crystal and generate the low-dimensional perovskite at the crystal boundary, and the second passivation layer can interact with the low-dimensional perovskite structure, thereby further protecting the perovskite film, improving the interface of the perovskite light absorption layer and the electron transport layer, and improving the short-circuit current density, open-circuit voltage and cell efficiency of the cell.

The present invention belongs to the technical field of ceramic material preparation methods, and specifically relates to a lead-free piezoelectric ceramic, its preparation method, and application. The lead-free piezoelectric ceramic is a KNN-based lead-free piezoelectric ceramic or a BT-based lead-free piezoelectric ceramic having a perovskite structure; the KNN-based lead-free piezoelectric ceramic is prepared by doping gallium nitride with potassium sodium niobate (KNN) ceramic as the matrix, and the chemical formula is 0.955 (K 0.48 Na 0.52 )Nb 0.98 Sb 0.02 O3‒0.045Bi 0.5 Na 0.5 ZrO3‒0.75mol% GaN; The BT-based lead-free piezoelectric ceramic is prepared by doping gallium nitride with barium nitride (BT) as the matrix, and the chemical formula is (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 ) O‒1.75mol% GaN; the lead-free piezoelectric ceramic has a dense structure, is lead-free, and exhibits excellent electrochemical properties. The preparation method for the lead-free piezoelectric ceramic is simple, low-cost, pollution-free, and utilizes readily available raw materials. The lead-free piezoelectric ceramic can be used to prepare energy harvesters and has significant application value.

The invention discloses a self-assembled monomolecular material based on pyrene-carbazole diphosphate and a preparation method and application thereof, and belongs to the technical field of perovskite solar cells. According to the material, two carbazole units and a pyrene core are in conjugate connection to form a large conjugate plane structure, and the material has the following advantages: 1) a rigid molecular skeleton and an expanded conjugate system significantly improve thermal stability and chemical stability; 2) the conjugate plane of pyrene enhances intermolecular pi-pi accumulation, and promotes hole extraction and transmission; and 3) energy level matching is accurately regulated and controlled, a compact interface layer is formed, and electron-hole recombination is inhibited. When the hole transport layer is applied to the trans-perovskite solar cell, the photoelectric conversion efficiency and the long-term stability can be improved at the same time, and the hole transport layer has a good industrialization prospect.

The invention provides a solar laminated cell and a preparation method thereof, and a photovoltaic module, and relates to the field of photovoltaic technology, the solar laminated cell comprises a bottom cell and a top cell which are laminated along a first direction, and a composite layer is arranged between the bottom cell and the top cell. The top cell comprises a first transmission layer, a perovskite layer, a second transmission layer, a transparent conducting layer and a first electrode which are arranged in the first direction, the surface, facing the transparent conducting layer, of the perovskite layer is provided with a first suede structure, the first suede structure comprises a plurality of protruding parts, the height of the protruding parts in the first direction is D1, and the height of the second transmission layer is D1; the thickness of the perovskite layer along the first direction is D2, D1 and D2 meet the condition that D1 / D2 is greater than or equal to 0.1 and less than or equal to 0.3, the first suede structure is arranged on the perovskite layer, so that the solar laminated cell can absorb larger incident light, meanwhile, the contact area of the perovskite layer and the second transmission layer is increased, and the short-circuit current and the filling factor of the solar laminated cell are improved.

The invention discloses a preparation method and application of washable tin-based perovskite quantum dots, and the preparation method comprises the following steps: mixing cesium iodide powder, tin iodide powder and mesoporous silica powder, and then placing the mixture in a plasma ball mill for ball-milling diffusion, cesium iodide and tin iodide react in a confinement space of mesoporous silica to generate a CsSn I < 3 >-coated SiO2 composite structure, CsSn I < 3 > quantum dots are dispersed and coated in the mesoporous silica, and the application of the tin-based perovskite quantum dots in the anti-ultraviolet textile fabric is provided. The method has the following beneficial effects that the purpose of remarkably improving the stability of the tin-based perovskite quantum dots and the washing resistance of the textile is achieved.

The nano titanium oxide main body photocatalytic sterilization multi-element material provided by the invention comprises 85%-98% of a nano titanium oxide material, 2%-15% of a perovskite material and a modifier, the modifier comprises silver, silver oxide and graphene, and the modifier comprises a nano titanium oxide main body and a nano titanium oxide main body. The nano titanium oxide main body photocatalytic sterilization multi-element material can fully utilize the characteristics of a perovskite structure material, overcomes the defects of a nano titanium oxide material, improves the light utilization rate, inhibits carrier recombination, improves the antibacterial durability, can utilize ultraviolet light to carry out catalytic sterilization and can also utilize ions to carry out sterilization, and the antibacterial effect is good. Sterilization can be achieved through the photolysis reaction of visible light, the synergistic composite sterilization effect is achieved, harmful germs are rapidly and effectively killed, the environment is kept fresh and safe, and the comprehensive sterilization and deodorization effect can be achieved by adding the modifier; the preparation method of the nano titanium oxide main body photocatalytic sterilization multi-element material provided by the invention is simple in steps, convenient to operate and easy to implement.

The invention relates to a cross-system lattice constant modeling method, device and medium based on Pareto frontier optimization and symbolic regression collaboration, and the method comprises the steps: collecting theoretical calculation and experimental data of a perovskite and spinel cubic phase system, and constructing an initial data set containing geometric and electronic structure parameters; preprocessing the data; performing global search by adopting a Pareto frontier optimization algorithm to improve prediction precision and feature consistency to obtain an optimal feature subset; generating a lattice constant analytical model with physical significance through genetic programming by using a symbolic regression algorithm; the model is finely adjusted through experimental data, and a cross-system prediction general formula suitable for experimental conditions is obtained. Compared with the prior art, the method has the advantages that the global optimal feature subset is efficiently searched in the multi-material system, the explicit quantitative relation between the lattice constant and the key material attribute is established, and an efficient and reliable calculation means is provided for lattice constant prediction and mechanism analysis of the complex material system.

The invention provides a perovskite solar cell, a preparation method thereof and a photovoltaic module. The perovskite solar cell comprises a first electrode, a hole transport layer, a perovskite layer, an electron transport layer and a second electrode which are stacked in sequence. The material of the hole transport layer comprises a biomolecular material which is fixed on a self-assembly monomolecular layer material through an intermolecular force, and the biomolecular material comprises one or more of guanine, adenine, thymine, uracil, cytosine, hydroxymethylcytosine, xanthine, hypoxanthine, 6-mercaptopurine and corrin. According to the perovskite cell provided by the invention, the biomolecular material with a plurality of nitrogen heterocyclic structures and amino groups is added to generate multipoint hydrogen-bond interaction and pi-pi accumulation with the tail end of the SAM, so that the orderliness of molecular arrangement is improved, and the dipole direction and strength of the whole interface are regulated and controlled; and a coordination bond or hydrogen bond network is formed by the coordination compound and uncoordinated cations or anions in perovskite, so that interface defects are effectively passivated, and the thermal stability and the humid and hot life of a device are enhanced.

The invention discloses a perovskite solar cell and a preparation method thereof, and belongs to the technical field of perovskite solar cells. SAM molecules are introduced between the hole transport layer and the perovskite active layer, the photoelectric conversion efficiency of the perovskite solar cell is improved, an interface modification layer comprising a sheet-shaped P-type semiconductor material is further introduced at the interface of the hole transport layer and the SAM layer, the interface of the hole transport layer / the SAM layer / the perovskite active layer is improved, and the photoelectric conversion efficiency of the perovskite solar cell is improved. The hole transport layer and the perovskite active layer are separated from each other, the energy level difference between the functional layers is reduced, the carrier extraction and transmission of an interface are enhanced, the sheet structure of the sheet P-type semiconductor material can cooperate with the compact SAM layer to block the direct contact between the hole transport layer and the perovskite active layer, and the hole transport efficiency is improved. And the reduction reaction of halide ions in an interinterface hole transport material and a perovskite material is effectively prevented.

The present invention discloses a two-terminal perovskite-silicon tandem cell and a preparation method thereof, which are applied to the technical field of perovskite solar cells. The two-terminal perovskite-silicon tandem cell includes a tandem cell sheet, and the tandem cell sheet includes a perovskite cell structure for absorbing visible light and a silicon cell structure for absorbing near-infrared light. A near-infrared light conversion layer is provided on the light-incident side surface of the two-terminal perovskite-silicon tandem cell, and the near-infrared light conversion layer is a down-conversion thin film. By converting the short wave in sunlight into a long wave through the near-infrared light conversion layer, the problem of current mismatch caused by the two-terminal perovskite-silicon tandem cell under the illumination condition with a relatively high proportion of visible light is solved, so that the two-terminal perovskite-silicon tandem cell has high performance.

The invention discloses a perovskite cell panel surface defect detection method based on improved YOLOv9, and belongs to the technical field of image processing and defect identification. The method comprises the following steps: optimizing a backbone network structure by introducing an ExtraDw module, enhancing feature expression ability and reducing parameter quantity; a neck network is improved by adopting GsConv and SlimNeck, so that the multi-scale feature fusion efficiency is improved; a MobileMQA module and a Bottleneck Transform structure are utilized to enhance the global perception capability and the calculation efficiency of the model; and a Slide Loss function is used to optimize the training process, and the problem of imbalance between difficult samples and positive and negative samples is adaptively processed. According to the method, the detection precision and the model generalization capability of the fine defects on the surface of the perovskite battery piece are remarkably improved while relatively low computing resource occupation is maintained, and the method is suitable for an industrial real-time quality detection scene.

The invention relates to a perovskite / crystalline silicon laminated solar cell structure taking a tin dioxide thin film as a composite layer and a preparation method of the perovskite / crystalline silicon laminated solar cell structure, and belongs to the technical field of photovoltaics. According to the perovskite / crystalline silicon laminated solar cell structure, the tin dioxide thin film is used as a composite layer, so that the cost of cell preparation is reduced; in the preparation method of the perovskite / crystalline silicon laminated solar cell, the composite layer and the electron transport layer can adopt the same preparation method, so that the equipment cost in the preparation process is reduced; the perovskite / crystalline silicon laminated solar cell obtained by the cell structure and the preparation method provided by the invention is relatively low in preparation cost and relatively high in photoelectric conversion efficiency.

The invention discloses a perovskite type composite metal oxide oxygen carrier catalyst as well as a preparation method and application thereof, and belongs to the field of biomass chemical chain gasification / reforming. The oxygen carrier catalyst is of a La, Fe and Ni co-doped SrTiO3 perovskite structure, and active components Fe and Ni are embedded into a main body SrTiO3 perovskite crystal phase structure in an oxide or simple substance form; the method comprises the following steps: preparing an aqueous solution of lanthanum nitrate, strontium nitrate, nickel nitrate, ferric nitrate and citric acid, adding a mixed solution of tetrabutyl titanate and ethylene glycol into the aqueous solution, heating in a water bath, and stirring to form gel; drying and calcining the gel to obtain intermediate powder; and the intermediate powder is oxidized and reduced to form a high-temperature crystal structure under different atmospheres, and the perovskite type composite metal oxide oxygen carrier catalyst is obtained. The oxygen carrier catalyst provided by the invention has high tar conversion rate and stable cycle activity in the biomass chemical chain gasification / reforming process.

The invention relates to a perovskite photovoltaic cell high-transmittance low-scattering coating material and a preparation method thereof, and belongs to the technical field of photovoltaic cells. The coating material is prepared from the following components in percentage by weight: 7.2 to 8.5 percent of PMMA (Polymethyl Methacrylate) resin, 0.17 to 0.22 percent of modified nano titanium dioxide, 0.09 to 0.11 percent of flatting agent, 0.03 to 0.04 percent of defoaming agent and the balance of solvent, the modified nano titanium dioxide is prepared into an intermediate through addition reaction of triallylamine and mercaptoethanol, and then a modifier with a network molecular structure is formed through substitution reaction of trifluoropropyl trichlorosilane and hydroxyl at the end part of an intermediate molecule; a thioether chain segment in a modifier molecule and similar nitrogen and oxygen elements form a strong chelation effect to coat the nano titanium dioxide; the introduction of the modified nano titanium dioxide makes up the problem of light transmission reduction caused by traditional titanium dioxide reinforcement.

The invention provides a perovskite solar cell. The perovskite solar cell comprises a conductive substrate; a hole transport layer; a polymer hydrophobic layer; the polymer hydrophobic layer is formed by polymer ionic liquid; a perovskite thin film layer; an electron transport layer; an electrode layer; the polymer ionic liquid comprises a structure as shown in a formula (I). Compared with the prior art, the polymer ionic liquid provided by the invention has hydrophobicity and can effectively block invasion of water vapor to a perovskite layer when being applied; secondly, a monomer in the polymer ionic liquid contains imidazole, C-H in the monomer can form hydrogen bonds with halogen atoms in the perovskite, the interaction between a polymer chain and the perovskite is enhanced, and the phase change of the perovskite is inhibited; in addition,-SO3-at one end of the polymer ionic liquid can be combined with Pb < 2 + > in perovskite through electrostatic interaction, phase change of the polymer ionic liquid is further inhibited, and Pb leakage is reduced.

The invention relates to a method for packaging perovskite quantum dots by photon sintering. The preparation method comprises the following steps: firstly, preparing turbid liquid of mesoporous silica nanoparticles; coating the surface of a substrate with the obtained turbid liquid, and drying to form a layer of uniform mesoporous silica nanoparticle array on the surface of the substrate; immersing the obtained substrate into a perovskite precursor solution, and carrying out ultrasonic treatment and crystallization to obtain a quantum dot crystallized substrate; and carrying out photon sintering packaging to obtain the perovskite quantum dots. According to the invention, mesoporous silica nanoparticles are used as a packaging material, a porous structure is used for confinement growth, quantum dots are uniformly dispersed in a submicron scale, accurate size control is realized, and quantum dot agglomeration is avoided. A photon sintering process is used, and packaging of quantum dots is realized through rapid energy transfer. According to the process, sintering can be completed at the millisecond level, surface traps and oxidation reactions possibly introduced in the traditional thermal annealing process are reduced, and the optical performance and stability of the quantum dots are further improved.

A photovoltaic structure includes a transparent substrate and a transparent bottom electrode provided over the substrate. The transparent bottom electrode includes a first set of metal lines in contact with a first conducting layer. The first set of metal lines is characterized by an average height (H) of at least about 150 nm, an average width (W), and an aspect ratio H / W of at least about 1 / 250. A self-assembled molecular charge selective layer (SAM-CSL) is disposed over the transparent bottom electrode. A perovskite absorber layer overlays the SAM-CSL, an upper carrier transport layer overlays the perovskite absorber layer, and a top electrode overlays the upper carrier transport layer.

The invention provides a crystalline silicon solar cell and a perovskite / crystalline silicon laminated solar cell, and belongs to the technical field of solar cells. The crystalline silicon solar cell comprises a cell body, the surface of the cell body is provided with a suede structure, the suede structure comprises a plurality of first pyramids, and each first pyramid comprises a first tower bottom and a first tower top which are arranged in the direction away from the surface of the cell body; and gaps exist between the first tower bottom boundaries of at least part of adjacent first pyramids in the plurality of first pyramids. The crystalline silicon solar cell or the perovskite / crystalline silicon laminated solar cell is based on the improvement of the textured structure, has better light utilization rate and passivation effect, and is beneficial to improving the cell performance.

The invention relates to a high-entropy perovskite material and a preparation method and application thereof, the chemical formula of the high-entropy perovskite material is ABO3, the A-site element is La element, and the B-site element is selected from 5-10 transition metal elements; the high-entropy perovskite material has a two-dimensional Tailing structure, nano-particles are arranged in a cross-linking manner, and gaps are formed among the particles. Compared with the prior art, the two-dimensional Turing structure high-entropy perovskite material is endowed with excellent electro-catalytic water decomposition hydrogen production performance due to unique morphology and components, is adaptive to fluctuation power of clean energy such as wind energy and solar energy, and has a wide industrial application prospect.

The invention discloses a high-temperature lead-free piezoelectric ceramic material, a preparation method thereof and a piezoelectric ceramic device. The method comprises the following steps: S1, obtaining 0.7 BiFeO3-0. 3 BaTiO3 ceramic powder of a perovskite phase structure, namely Ba (Zr < 0.2 > Ti < 0.8 >) O3 ceramic powder; s2, (1-x) (BF-BT)-xBZT ceramic powder is prepared according to the structural general formula (1-x) (0.7 BiFeO3-0.3 BaTiO3)-x (Ba (Zr0. 2Ti0. 8) O3), and (1-x) (BF-BT)-xBZT ceramic powder is obtained; wherein x is more than or equal to 0.02 and less than or equal to 0.06; s3, (1-x) (BF-BT)-xBZT prefabricated powder is obtained; s4, performing granulation and compression molding on the prefabricated powder to obtain a ceramic green body; and S5, heating, glue discharging and solid-phase sintering are carried out on the ceramic green body, and the piezoelectric ceramic material is obtained. The piezoelectric ceramic material can replace the traditional lead-based piezoelectric ceramic to be applied in a high-temperature and low-electric field.

The invention provides a perovskite solar cell and a preparation method thereof. The perovskite solar cell comprises a transparent substrate layer, a hole transport layer or an electron transport layer, a perovskite active layer, a hole transport layer or an electron transport layer and a composite electrode layer which are sequentially arranged from bottom to top, the composite electrode layer is of a double-layer composite structure composed of a first metal layer and a second metal layer, and the first metal layer is a molybdenum metal layer. The high chemical stability and compact structure of the molybdenum metal layer are utilized, a physical barrier is formed between the perovskite active layer and the second metal layer, migration of halogen ions such as iodine (I-) to the top electrode is effectively inhibited, direct corrosion reaction between the second metal layer and the halogen ions is avoided, and the stability of long-term operation of the device is remarkably improved.

The invention provides a perovskite solar cell, a preparation method thereof and a photovoltaic module, and the perovskite solar cell comprises a substrate, a first carrier transmission layer, a perovskite absorption layer, a second carrier transmission layer and an electrode layer which are sequentially stacked. And a nano-silver particle layer is arranged between the first carrier transport layer and the perovskite absorption layer. According to the invention, the nano-silver particle layer is used as a crystal nucleus, so that the crystallization of the perovskite absorption layer is promoted, and the high-quality perovskite thin film with large grain size and low defect density is formed; in addition, the particle surface of the nano-silver particle layer can reflect sunlight, a light trapping structure is formed, and the utilization rate of light can be remarkably improved. In conclusion, the photoelectric property of the perovskite solar cell can be effectively improved, and the perovskite solar cell has a wide application prospect.

The invention provides a preparation method of a red light perovskite quantum dot with a core-shell structure, and belongs to the technical field of quantum dot preparation. According to the method, a CsPbI3 quantum dot coarse solution and a cadmium sulfide precursor solution are mixed, stirred and heated to a certain temperature, cadmium sulfide grows on the surface of the quantum dot in an epitaxial mode, the red light CsPbI3 / CdS core-shell quantum dot is prepared, the formation of a core-shell structure is beneficial to passivation of defects on the surface of the quantum dot, and meanwhile ion migration and Auger recombination of the quantum dot are inhibited. The invention provides a solution for preparing the red light perovskite quantum dot light-emitting diode with high external quantum efficiency, long service life and low efficiency roll-off.

The invention discloses a perovskite thin film, a photoelectric device and a method for improving the surface quality of the perovskite thin film. The method for improving the surface quality of the perovskite thin film comprises the following steps: S1, preparing the perovskite thin film; s2, performing picosecond pulse laser surface polishing treatment; and S3, guanidine ion implantation and repair: applying a guanidine salt solution to the surface of the perovskite thin film, removing the redundant guanidine salt solution on the surface of the perovskite thin film after the guanidine ions are implanted into the surface of the perovskite thin film, and then carrying out annealing treatment. According to the method, the surface of the perovskite thin film is polished through the picosecond pulse laser, the roughness of the surface of the perovskite is effectively reduced, a surface layer rich in defects is removed, guanidine ions are selectively implanted again through a multi-A-site vacancy structure formed on the surface of the perovskite thin film subjected to laser polishing, multiple hydrogen bonds are formed through the guanidine ions and a perovskite framework, and the surface roughness of the perovskite thin film is effectively reduced. And deep and stable defect passivation and lattice strengthening are realized, and the high-quality perovskite thin film with smooth surface, low defect density and high stability is obtained.

The invention belongs to the technical field of perovskite solar cells, and particularly relates to a preparation method for improving the quality of a perovskite thin film by using a local high-temperature field, and the method comprises the steps: 1, forming a perovskite precursor thin film on an electron transmission layer; step 2, when the precursor film is in an intermediate phase or an incompletely crystallized state, placing the precursor film below a heating plate with a microstructure array, keeping a gap between a convex part of the microstructure array and the surface of the precursor film, and forming a periodically distributed local high-temperature field on the surface of the precursor film; step 3, maintaining the local high-temperature field to act for a period of time, so that the local area of the precursor film is preferentially crystallized; and 4, removing the heating plate, and uniformly annealing the precursor film. According to the method, a local high-temperature field is applied to induce a hot spot region to preferentially nucleate, abnormal growth and Ostwald ripening of crystal grains are inhibited, and the large-area uniform perovskite thin film with narrow crystal grain size distribution, low defect density and a flat film surface is obtained, so that the efficiency and consistency of a device are improved.

The invention relates to the technical field of photovoltaic solar cells, and discloses a perovskite thin film, a preparation method and application, the perovskite thin film is prepared from a perovskite precursor solution by adopting a one-step spin-coating method or a two-step deposition method, and the perovskite precursor solution comprises 2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- The perovskite material is prepared from 2, 4-oxazolidinedione, a raw material for synthesizing the perovskite material with the ABX3 crystal structure, and a solvent. According to the invention, 2, 4-oxazolidinedione (OD) molecules are simply introduced into a perovskite precursor solution, especially into an inorganic precursor solution (such as a lead iodide precursor solution), and the porous PbI2 can be obtained by utilizing the interaction between electron-donating groups in the OD molecules and lead iodide, so that when the organic ammonium salt is spin-coated in the second step, the porous PbI2 can be obtained. The organic ammonium salt solution can rapidly diffuse and fully react, so that the perovskite thin film with larger and more uniform crystal grains is obtained, and the residual amount of harmful PbI2 is remarkably reduced.

The invention discloses a method for preparing a perovskite solar cell based on a nanoimprint technology, which belongs to the technical field of solar cell devices, and comprises the following steps: preparing a PDMS (Polydimethylsiloxane) soft film with a nano conical column structure on the surface, and then carrying out thermal nanoimprint on a perovskite thin film. The nano cone-column structure can induce regular and uniform growth of perovskite grains, so that the perovskite grains are regular in size and orderly arranged, and the grain boundary density and holes are reduced; and meanwhile, the nano conical column structure on the surface of the perovskite thin film can scatter incident light to increase the effective optical path length in the device, so that the light absorption of the device is enhanced, and the efficiency and the stability of the finally obtained perovskite solar cell are remarkably improved.

Lanthanum perovskite oxide coated high nickel ternary positive electrode material and preparation method thereof, wherein the positive electrode material is a spherical particle formed by coating a high nickel ternary positive electrode material with a lanthanum perovskite oxide coating layer at a mass ratio of 0.01 to 0.03:1; the chemical formula of the lanthanum perovskite oxide is La z Ca 1‑z CoO3, where 0 < z ≤ 1; the chemical formula of the high nickel ternary cathode material is LiNi x Co y Mn (1‑x‑y) O2, wherein 0.80≤x≤0.96, 0.01≤y≤0.10, and 1-x-y>0. The preparation method comprises ball-milling a lanthanide perovskite oxide with a high-nickel ternary cathode material, followed by low-temperature sintering under a protective atmosphere. The cathode material of the present invention exhibits high lithium ion and electron conductivity during charge and discharge, is highly reversible, has a stable structure, and exhibits excellent rate capability and cycle stability. The method of the present invention is simple, low-cost, and suitable for industrial production.

The invention discloses a perovskite material solution, a perovskite film and a preparation method and application thereof, and the preparation method of the perovskite material solution uses a high-boiling-point solvent as an independent additive, specifically, after a perovskite precursor is completely dissolved and filtered, the high-boiling-point solvent (a single or composite system) is quantitatively added, and the perovskite material solution is prepared. Subsequent preparation of the perovskite film can achieve the following effects by accurately controlling the vacuumizing rate and the processing time: (1) the crystallization window period is prolonged due to the slow evaporation characteristic of the high-boiling-point solvent, perovskite crystal grains are promoted to grow orderly, a uniform and compact film microstructure is formed, internal stress accumulation caused by rapid crystallization is effectively relieved, and the performance of the perovskite film is improved; the cracking risk is obviously reduced; and (2) solvent molecules are preferentially enriched in a grain boundary region in a deposition process, and uncoordinated Pb < 2 + > defects are passivated through coordination, so that the defect density of the thin film is reduced, and the photoelectric conversion efficiency of a device is improved.