49results about How to "Improve ionic conductance" patented technology

The invention discloses a preparation method of a lithium ion battery cathode material SiOX-TiO2/C. The preparation method comprises steps as follows: analytically pure organic silicon sources, organic titanium sources and organic carbon sources are weighed in a certain mole ratio; the organic silicon sources are dissolved in a mixed solution of deionized water and absolute ethyl alcohol and stirred, the pH of the solution is adjusted to be alkaline, and a mixed solution A is obtained; the organic titanium sources are dissolved in the absolute ethyl alcohol and stirred for a period of time, and a mixed solution B is obtained; the mixed solution B is added to the mixed solution A and left to stand at the room temperature after being stirred for a period of time, and a colloidal mixed solution is obtained; after the colloidal mixed solution is mixed with the organic carbon sources, mechanical ball-milling treatment is performed; the mixed solution after mechanical ball-milling treatment is dried, and a precursor is obtained; the precursor is put in a crucible and calcined under the protection of inert atmosphere, thermal insulation is performed for multiple hours, and a product is cooled to the room temperature with the furnace. Compared with the prior art, the cathode material prepared with the method has good rate performance, the raw materials are cheap, the preparation process is simple, and the yield is high.

The invention relates to preparation of a garnet type solid electrolyte material, and a buffer layer design and the solid electrolyte of the type are applied to a solid-state lithium ion secondary battery. The preparation in the invention can be applied to all-solid-state lithium ion batteries, lithium-sulfur batteries and the like and has the functions of electrolyte and diaphragms. The solid electrolyte of the type has the characteristics of high ionic conductivity, stability, chemical stability, wide electrochemical window and the like, the preparation process of the lithium ion battery canbe simplified, the cost can be reduced, and the safety of the battery can be remarkably improved.

The invention discloses a surface double-coated lithium-enriched material and a preparation method thereof. The surface double-coated material is a composite material formed by sequentially coating the outer surface of a lithium-enriched material with a metal compound layer and a carbon layer, wherein the lithium-enriched material has a chemical formula of Li<1+>xMnyMzAwOr, M is at least one of Ni, Co, Al, Mg, Ti, Fe, Cu, Cr, Mo, Zr, Ru and Sn, and A is at least one of S, P, B and F; and x is more than 0 and less than or equal to 1, y is more than 0 and less than or equal to 1, z is more than or equal to 0 and less than 1, w is more than or equal to 0 and less than or equal to 0.2, and r is more than or equal to 1.8 and less than or equal to 3. The preparation method comprises the following steps: preparing a soluble metal salt solution; soaking the lithium-enriched material in the solution, adding a precipitator, stirring, filtering, drying and heating; soaking the heated sample in a carbon source-contained solution for stirring, and drying; heating and carbonizing the dried sample at a protective atmosphere to obtain the surface double-coated lithium-enriched material. According to the surface double-coated lithium-enriched material, the stability and conductivity of the material structure can be improved, and the circulating performance and rate performance of the lithium-enriched material can be improved.

The invention discloses a preparation method for a porous graphene micro-sheet. The preparation method is characterized by comprising the following steps: 1) pretreatment of graphite: putting graphite into a mixed solution consisting of an oxidizing agent and intercalator, performing ultrasonic stirring for 3-5h; washing, filtering and drying the obtained product, and putting the product into a muffle furnace, and processing the product in nitrogen atmosphere at a high temperature of 600-1,200 DEG C for 2-6h to obtain an expanded graphite product for use; and 2) preparation of the porous graphene micro-sheet: dissolving the expanded graphite obtained in the above step into a certain amount of deionized water, adding 0.1-2wt% of surfactant, performing ultrasonic stirring for 0.5-2h, and then adding a certain amount of pore forming agent, and putting into the muffle furnace under the N2 protective atmosphere for processing for 1-3h; washing the obtained product by dilute acid or dilute alkali and the deionized water solution for multiple times; drying the product in a vacuum drying oven for 2-6h to obtain the porous graphene micro-sheet. The porous graphene micro-sheet prepared by the preparation method provided by the invention is relatively high in specific surface area (850-1,000 m2/g); and due to the porous structure, the diffusion rate of the lithium ions can be improved, and a relatively better electrochemical performance can be obtained.

The invention discloses a solid-state lithium ion battery applying a composite positive electrode as well as an assembly method and application of the solid-state lithium ion battery. The assembly method comprises the steps of (1) mixing an electrode material, a binder and a conductive additive, and uniformly grinding, then adding the mixture into an N-methyl pyrrolidone solvent, fully grinding and uniformly mixing, coating a current collector aluminum foil with the mixture, and drying to obtain a positive pole piece; (2) mixing and grinding the solid electrolyte powder and a binder, adding the mixture into an NMP solvent, performing wet grinding, and performing ultrasonic dispersion to obtain a uniformly dispersed solid electrolyte dispersion liquid; coating the dispersion liquid of the solid electrolyte on the surface of the positive pole piece, forming a solid electrolyte coating on the surface of the positive pole piece by using a scraper film forming method, and completely dryingto obtain a composite positive pole piece; and (3) taking the composite positive pole piece as a positive electrode in the solid-state battery, taking a metal negative electrode material as a negativeelectrode, activating the interface, packaging in a button battery shell, and pressurizing and sealing to obtain the solid-state battery.

The invention discloses a preparation method for an all-solid-state lithium ion electrolyte material Li7La3Zr2O12. The preparation method comprises the following steps: (1) taking LiNO3 and LiOH as fused salt and a lithium source, and mixing and grinding LiNO3, LiOH, La2O3 and ZrO2; and (2) performing calcining on the grinded mixture in an inert atmosphere at the temperature of 700-900 DEG C for 3-5 hours, and then naturally cooling to the room temperature to obtain the all-solid-state lithium battery ion material Li7La3Zr2O12. The preparation method provided by the invention is short in calcining time, low in temperature, and simple in operation without introducing non-reactant foreign matters; and the product has a nanosheet laminated structure and a high specific surface, so that the ionic conductance at the normal temperature is greatly improved.

The invention relates to the field of electrolyte membrane materials, and specifically relates to a mica based electrolyte membrane for a solid oxide fuel cell and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing cetyltrimethylammonium bromide and sericite powder; and thermally processing for 3-5h under the temperature of 40-80 DEG C; (2) processing the product obtained in step (1) through 20-30MHz ultrasonic wave for 1-4h; and roasting the product obtained in ultrasonic processing for 30-180min under the temperature of 400-800 DEG C to obtain two-dimensional nano mica; (3) mixing the precursor liquid of electrolyte and the two-dimensional nano mica; and spraying to deposit on the anode surface of an electrode under the temperature of0.5-0.8MPa; and (4) processing the deposited membrane obtained in step (3) with laser to obtain the mica based ultra-thin electrolyte membrane. The electrolyte membrane has the thickness at nanometerlevel, and is outstanding in oxygen ion transfer performance.

The invention provides a preparation method and application of porous SiO2 microspheres for a lithium ion battery diaphragm, which belong to the technical field of battery diaphragm coating. The preparation method for the porous SiO2 microspheres for the lithium ion battery diaphragm comprises the following steps of: preparing spherical SiO2 particles, adding the prepared spherical SiO2 particlesinto water, adding a protective agent, adding an alkaline solution, conducting stirring, conducting centrifuging and cleaning after etching for a certain time and acquiring a porous SiO2 microspheres.In addition, the invention also provides application of the porous SiO2 microspheres for the lithium ion battery diaphragm, and the application comprises the following steps of: taking a certain amount of porous SiO2 microspheres, dispersing the porous SiO2 microspheres by using a dispersing agent, adding a certain amount of a binder, preparing a coating solution, and coating a base membrane by using the coating solution. The porous SiO2 microspheres prepared by the preparation method disclosed by the invention are simple to prepare, and the coated diaphragm is good in air permeability and good in thermal stability, and has a good application prospect.

The invention provides a lanthanum indium co-doped strontium titanate conductor material and a preparation method thereof. According to the invention, a material chemical general formula is Sr1-xLaxTi1-yInyO3, and 0.1</=x</=0.4 and 0.03</=y</= 0.1; tetrabutyl titanate is used as a titanium source; anhydrous ethanol and isopropyl alcohol are used as solvents; the oxide of lanthanum and indium is used as a dopant raw material; a sol-gel method is used to prepare the lanthanum indium co-doped strontium titanate conductor material; the lanthanum indium co-doped strontium titanate conductor material has a single cubic phase perovskite structure, has the advantages of good stability, excellent electronic conduction and ion conductance, and can satisfy the application needs of many fields such as a fuel cell anode material, an oxygen permeation membrane, an automobile exhaust gas sensor and the like; and compared with a traditional solid-phase sintering method, the preparation method provided by the invention has the advantages of short reaction time, low energy consumption, high product density, uniform composition, wide application prospect and the like.

The invention provides an electrode plate and a preparation method thereof, and a lithium ion battery. The electrode plate comprises a current collector and active substance layers positioned on two sides of the current collector, wherein the active substance layers are provided with holes, and the thickness of the electrode plate is more than 0.30 mm. The preparation method comprises the following steps: 1) coating two surfaces of the current collector with electrode slurry, and carrying out drying and rolling to obtain an unpunched electrode plate, wherein the thickness of the electrode plate which is not punched is 0.30 mm or above; and 2) punching the active substance layers of the unpunched electrode plate to obtain the electrode plate. According to the electrode plate provided by theinvention, by increasing the thickness of the electrode plate, the proportion of the current collector is reduced, and specific energy is improved; the electronic conductivity of the electrode plateis improved through the variety and proportion of a conductive agent; by punching holes in the active substance layers, the liquid absorption property of the electrode plate is improved, the polarization internal resistance of the electrode plate is reduced, the optimization of the ionic conductance of the electrode plate is improved, and the rate capability of the battery is maintained.

The invention belongs to the field of batteries and relates to a preparation method of a low-cobalt single-crystal positive electrode material. The preparation method comprises the following steps of: mixing a nickel-cobalt-manganese precursor, an oxidizing lithium salt and an additive I; and performing primary roasting to obtain the low-cobalt single-crystal positive electrode material. The low-cobalt and cobalt-free positive electrode material is used as a matrix, oxygen is obtained by oxidative decomposition of the lithium salt, on one hand, a lithium source is provided, and on the other hand, positive ion mixing and high-temperature oxygen loss reaction of the positive electrode material are effectively inhibited; through bulk phase doping and surface coating, the inhibition of change of a crystal structure and reduction of side reaction of an electrolyte and the material are benefited, so that the prepared low-cobalt and cobalt-free low-cobalt single-crystal positive electrode material is good in crystal structure and free of chemical valence defects, has the characteristics of low preparation cost, simple process and short preparation period, can be applied to a lithium ion battery, and improves physical and chemical properties and electrical properties.

The invention provides a coated lithium ion battery positive electrode material as well as a preparation method and application thereof. The coated lithium ion battery positive electrode material comprises a lithium oxide core and a coating layer coating the lithium oxide core, the coating layer comprises a combination of Li4Ti5O12, TiO2 (titanium dioxide) and Ti4O7 (titanium dioxide). In the preparation process, a lithium oxide is used as a substrate, and a titanium source, an oxygen source and a lithium source are deposited on the substrate by using a deposition system to obtain the coated lithium ion battery positive electrode material. According to the positive electrode material provided by the invention, the Li4Ti5O12, the TiO2 and the Ti4O7 are coated on the inner core, so that the coating of a high-ionic-conductivity and high-electron-conductivity material is realized, the overall structural stability of the material can be improved, the reversible specific capacity and the cycling stability of the material are further improved, and the positive electrode material has a good application prospect.

The invention provides a lithium cobalt oxide cathode material with a surface coated with a tin-containing compound. The cathode material can be prepared by a dry method or a wet method. The coating layer effectively reduces the direct contact between lithium cobalt oxide particles and an electrolyte, reduces the generation of a side reaction and dissolution of cobalt in the electrolyte and improves the utilization rate of the cathode material in the cycle process so as to effectively improve the cycle stability and the coulombic efficiency of the lithium cobalt oxide cathode.

The invention discloses a high-temperature-resistant positive electrode material and electrolyte composition, a lithium battery and a preparation method, the high-temperature-resistant positive electrode material comprises an inner core and a shell layer, the inner core comprises a nickel-cobalt-manganese ternary positive electrode material and doping elements, and the shell layer is a solid electrolyte; the ionic conductivity of the electrolyte is larger than or equal to 9.8 mS/cm, and the functional additive in the electrolyte is at least one of TMSPi + VC, HFiP, LiTFSI and VC + LiPF6. The functional additive in the electrolyte and the solid electrolyte jointly form a thicker and stable protective film, so that the cycle performance of the battery cell is greatly improved.

The invention discloses a molybdenum disulfide/sulfur-doped graphene composite material and a preparation method and application thereof. The molybdenum disulfide/sulfur-doped graphene composite material comprises a carbon layer, molybdenum disulfide and sulfur-doped graphene. The preparation method comprises the following steps: mixing raw materials of molybdenum salt, graphene oxide dispersion liquid, dimethyl trisulfide and an oxygen-containing organic carbon source, then carrying out hydrothermal reaction, and carrying out heat treatment to obtain the molybdenum disulfide/sulfur-doped graphene composite material. The preparation method disclosed by the invention is simple to operate, mild in reaction condition and suitable for industrial production; and according to the molybdenum disulfide/sulfur-doped graphene composite material prepared by the preparation method, the electronic conductivity, the ionic conductivity and the specific capacity are greatly improved, and the cycling stability is good.

The invention discloses an electrophoretic deposition-microwave sintering combined processing method for a nickel-chromium baked porcelain denture. The method includes depositing a porcelain layer with a specific thickness on the surface of a nickel-chromium alloy by an electrophoretic deposition method and cladding the porcelain layer on the nickel-chromium alloy by means of microwave heating so as to obtain the nickel-chromium baked porcelain denture. The nickel-chromium baked porcelain denture prepared by the method is uniform in coating and good in bonding force, and accordingly the method can be widely applied to a nickel-chromium baked porcelain denture processing process.