34results about How to "Improve interface impedance" patented technology

The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a high-voltage lithium-ion battery electrolyte. The high-voltage lithium-ion battery electrolyte comprises non-aqueous solvent, lithium salt and an additive. The additive comprises the mixture of phosphonitrile, annular sulphate and hydrogen fluoroether. The high-voltage lithium-ion battery electrolyte can form a film on the surface of an electrode through the synergistic effect of the phosphonitrile, the annular sulphate and the hydrogen fluoroether, oxygenolysis of the electrolyte is restrained, and the cycle performance of 4.5 V and 5.0 V high-voltage lithium-ion batteries is obviously improved.

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium salt and a functional additive, wherein the functional additive comprises 4,4'-dipinacol borate diphenyl sulfone, dipyridyl carbonate and lithium difluorophosphate. When the electrolyte provided by the invention is applied to a lithium ion battery of ahigh-nickel ternary material / graphite system, the impedance of the lithium ion battery can be remarkably reduced, the power performance of the lithium ion battery can be improved, gas production of the lithium ion battery in circulation and storage processes can be remarkably inhibited, and the rate capability, the normal-temperature cycle performance, the high-temperature cycle performance, thehigh-temperature storage performance and the safety performance of the lithium ion battery are remarkably improved.

The invention discloses a preparation method of a solid electrolyte with a surface coating. The preparation method comprises the steps of preparation of an LLZO ceramic chip, preparation of FS glue, formation of the solid electrolyte and the like. The invention further provides a solid-state electrolyte battery which comprises the solid electrolyte prepared by the preparation method of the solid electrolyte with the surface coating, and further comprises a positive electrode layer and a negative electrode layer which are arranged on the two sides of the solid electrolyte. The solid electrolyteprepared by the method has the advantages that firstly, an inorganic ceramic material is doped with Ga and Nb elements, so that the cubic phase structure of LLZO is stabilized, and the ionic conductivity is correspondingly improved; secondly, the two sides of the inorganic solid electrolyte are coated with the mixed fumed silica in the lithium ion electrolyte, so that the problem of interface contact is effectively solved, and the lithium ion conductivity of the lithium ion electrolyte is ensured; and the solid electrolyte of the solid electrolyte battery is prepared by the preparation methodof the solid electrolyte with the surface coating, and has the advantages of small interface impedance, high lithium ion conductivity and the like.

The invention provides a solid electrolyte membrane, a preparation method thereof and a battery comprising the solid electrolyte membrane. The solid electrolyte membrane comprises a base membrane anda first polyoxyethylene membrane laminated on one surface of the base membrane, only the surface, facing the outer side, of the first polyoxyethylene membrane comprises a -C2H4-xFxO- structure, and xis an integer of 1-4. According to the invention, the surface of a PEO membrane is subjected to fluoridation treatment, so that the oxidation resistance of the electrolyte membrane is improved and theservice life of the battery is prolonged on the premise that the total influence on the lithium ion transmission performance of the membrane is minimum; meanwhile, a fluorinated layer has a relatively strong bonding effect on the surface of a pole piece, so that the interface impedance of the electrolyte membrane and pole piece can be improved, and the cycle performance of the battery is improved.

The invention belongs to the technical field of solid-state batteries, and discloses an alkali metal negative electrode-electrolyte integrated material and application of a preparation method of the alkali metal negative electrode-electrolyte integrated material to assembly of a solid-state battery in air. The method comprises the following steps: dissolving or dispersing an electrolyte component with an alkali metal protection function in an organic solvent, stirring to form electrolyte slurry, coating the slurry on the surface of an alkali metal material in a protective atmosphere, and volatilizing the organic solvent to obtain the alkali metal negative electrode-electrolyte integrated material. The process is simple and convenient, the operability is high, the coating area and thickness of the material are easy to control, and mass production is easy. The material can effectively block air and water so as to effectively protect an alkali metal negative electrode, the material can be used for assembling an alkali metal solid-state battery in an air environment, the assembling difficulty and environmental requirements can be reduced, and the production cost is further reduced. The material can also effectively reduce the interface contact resistance of an alkali metal negative electrode and an electrolyte, can inhibit the generation of alkali metal dendritic crystals, and improves the cycling stability of the prepared solid-state battery.

The invention provides a preparation method of a solid electrolyte, which comprises the following steps: dispersing a lithium precursor and a central atom ligand in an organic solvent to form a reaction primary mixed solution; dispersing borate in an organic solvent to form a modified solution; mixing the reaction primary mixed solution with the modified solution, and drying to obtain an initial product; conducting grinding, cold pressing and heat treatment on the initial product to obtain the solid electrolyte. According to the preparation method provided by the invention, borate is used as adoping raw material to modify the sulfide solid electrolyte, and the B and O co-doped sulfide solid electrolyte can be obtained; in the doping modification process, sufficient mixing between the sulfide electrolyte raw material and borate is realized; the borate is completely decomposed at the phase-forming temperature of the sulfide electrolyte, so that the introduction of impurities or the residue of reactants is reduced, the ionic conductivity of the prepared sulfide solid electrolyte is remarkably improved, and the energy density of the all-solid-state battery is favorably exerted.

The invention discloses a preparation method of a solid electrolyte with a surface coating. The preparation method comprises the steps of preparation of an LLZO ceramic chip, preparation of FS glue, formation of the solid electrolyte and the like. The invention further provides a solid-state electrolyte battery which comprises the solid electrolyte prepared by the preparation method of the solid electrolyte with the surface coating, and further comprises a positive electrode layer and a negative electrode layer which are arranged on the two sides of the solid electrolyte. The solid electrolyteprepared by the method has the advantages that firstly, an inorganic ceramic material is doped with Ga and Nb elements, so that the cubic phase structure of LLZO is stabilized, and the ionic conductivity is correspondingly improved; secondly, the two sides of the inorganic solid electrolyte are coated with the mixed fumed silica in the lithium ion electrolyte, so that the problem of interface contact is effectively solved, and the lithium ion conductivity of the lithium ion electrolyte is ensured; and the solid electrolyte of the solid electrolyte battery is prepared by the preparation methodof the solid electrolyte with the surface coating, and has the advantages of small interface impedance, high lithium ion conductivity and the like.

The invention discloses a preparation method and a battery of a solid electrolyte for controlling the orderly growth of lithium dendrites. Lamination with double-sided conductive adhesive, on the one hand, can control the growth direction of lithium dendrites in an orderly manner in the gap between the solid electrolyte and the metal lithium bonding surface, so that lithium dendrites can grow oppositely in the gap and avoid lithium dendrites. Piercing the solid electrolyte, on the other hand, the carbon coating can improve the interfacial impedance between the solid electrolyte and the cathode material and improve the conduction efficiency of lithium ions.

The invention relates to a high-safe solid state electrolyte, a preparation method thereof and an application in lithium secondary batteries. The solid electrolyte precursor solution includes a lithium salt, an isocyanate-containing compound and a polymer monomer containing a hydroxyl group. The solid electrolyte is obtained by polymerization of the precursor solution, and the polymerization temperature range is 20-80°C. The solid electrolyte precursor solution also includes one or more of plasticizers, active monomers, initiators and catalysts. The solid electrolyte contains polymerizable groups, which can undergo a polymerization reaction at a temperature higher than 100°C to form a polymer with a cross-linked network structure, so that the lithium battery does not have an internal short circuit under extreme high temperature conditions such as thermal abuse, and improves the lithium battery. Battery safety performance.

The invention discloses a gel composite positive pole plate. The gel composite positive pole plate is characterized by comprising a positive active substance, a conductive agent, a gel electrolyte, abinding agent and a current collector, wherein the binding agent, the conductive agent, the gel electrolyte and the positive active substance form a layered structure on a surface of the current collector, and the conductive agent and the gel electrolyte are uniformly dispersed in the positive active substrate and are associated via the binding agent. The invention also discloses a method for preparing the gel composite positive pole plate and a method for preparing an all-solid-state lithium battery.

The invention provides a solid electrolyte membrane, its preparation method and battery containing it. The solid electrolyte membrane includes a base film and a first polyethylene oxide film laminated on one surface of the base film, and only the surface of the first polyethylene oxide film towards the outside includes -C 2 h 4‑x f x O‑structure, where x is an integer from 1‑4. The present invention improves the oxidation resistance of the electrolyte membrane and improves the battery life by performing fluorination treatment on the surface of the PEO membrane on the premise that the overall influence on the lithium ion transmission performance of the membrane is minimal; at the same time, the fluorination layer has a strong The bonding effect can improve the interface impedance of the electrolyte membrane-electrode sheet and improve the cycle performance of the battery.

The invention belongs to the field of optical absorption, and discloses a high-optical-absorption carbon nanomaterial which comprises carbon black and carbon nanowalls which grow on the surface of the carbon black through a chemical vapor deposition method and have light trapping capacity, and light absorption is achieved through gap structures between the walls. A radio frequency plasma enhanced chemical vapor deposition process is adopted, a mode of increasing plasma energy density by using inert gas is adopted, chemical bonds of carbon source gas are opened under the action of reducing gas hydrogen, a vertically arranged carbon nano wall is constructed on the surface of carbon black through the processes of nucleation, migration, orientation, growth and the like, the effective refractive index is close to 1, the material has good interface impedance matching, incident light penetrates through the surface of the material to enter clearance spaces of walls in an almost non-reflection mode and is finally absorbed and converted into heat energy through multiple times of reflection between the walls, and efficient optical absorption in ultraviolet-visible light wave bands is achieved under the combined action of the physical mechanisms.

The invention provides a functionalized polyolefin composite diaphragm and its preparation method and application. The functionalized polyolefin composite diaphragm of the present invention is composed of carbon nanotubes, lithium salts, inorganic nano-silicon dioxide and polyolefin components. The invention provides The preparation method of the composite separator is as follows: the binder and the solution of functionalized carbon nanotubes are mixed with nano-silica to obtain a coating solution, and then the polyolefin separator is placed in an ethanol solution of lithium salt to obtain a lithium salt-modified polyolefin membrane. Olefin separator, and then the coating solution is evenly coated on the lithium salt modified polyolefin separator, and then after vacuum drying, functionalized carbon nanotubes and lithium salt coated polyolefin separator are obtained. The prepared separator has excellent mechanical properties Strength, high stability, high active surface area, good electrolyte wettability, excellent lithium ion conductivity and electrochemical performance, can be well used in the field of lithium ion batteries.

The application provides a method for preparing a solid electrolyte, comprising: dispersing a lithium precursor and a central atom ligand in an organic solvent to form a reaction mixture; dispersing a borate ester in an organic solvent to form a modified solution; The initial reaction mixture is mixed with the modified solution, and dried to obtain an initial product; the initial product is ground, cold-pressed, and heat-treated to obtain a solid electrolyte. In the preparation method provided in this application, the sulfide solid electrolyte is modified with boric acid ester as the doping raw material, and a B and O co-doped sulfide solid electrolyte can be obtained. During the doping modification process , to realize the sufficient mixing between the sulfide electrolyte raw material and the borate; and the borate is completely decomposed at the phase-forming temperature of the sulfide electrolyte, reducing the introduction of impurities or reactant residues, and the prepared sulfide solid electrolyte The ionic conductivity of the battery has been significantly improved, which is also conducive to the energy density of the all-solid-state battery.