39results about How to "Reduce interfacial internal resistance" patented technology

The invention discloses a flexible current collector, an electrode containing the flexible current collector, and a battery. The flexible current collector comprises a textile fabric base and a metal conductive coating; the fiber of the textile fabric is coated with the metal conductive coating; the thickness of the metal conductive coating is 200 nm to 5 microns. An electrode active material of the electrode containing the flexible current collector is loaded on the surface and / or in the hole of the flexible current collector. By adoption of the battery prepared from the electrode provided by the invention, the interface resistance of the battery can be effectively reduced, the electrode mass of unit area is reduced, and the mass energy density is improved; the flexible current collector provided by the invention has higher machining property relative to that of the traditional metal foil, so the production efficiency of the battery can be improved, and the production cost of the battery can be reduced; the current collector base is a macromolecular material and can be shrunk and fused at high temperature, so the safety performance of the battery is improved.

The present invention relates to a preparation method of a solid state lithium battery composite cathode film, belonging to the technical field of battery cathode materials. In order to solve the problems that sintering aids are required being added and the internal resistance of the interface is high in the prior art, the present invention provides a preparation method of a solid state lithium battery composite cathode film. The method comprises the steps of: performing uniform mixing and ball milling of active cathode particles and LLZO solid electrolyte particles in proportion, then dryingthe mixture to obtain composite cathode powder body particles, wherein the mass content of the LLZO solid electrolyte particles in the composite cathode powder body particles is 5.0-35wt%; mixing thecomposite cathode particles, a binder, adhesives, a dispersing agent, a plasticizer and a solvent to form a composite cathode slurry; and performing tape casting of the composite cathode slurry to prepare a composite cathode blank film, performing drying and rubber discharging of the composite cathode blank film, and performing low-temperature sintering processing at a temperature of 650-850 DEG Cto obtain a composite cathode film. The preparation method of the solid state lithium battery composite cathode film can effectively improve the interface densification, can reduce the interface impedance and can reduce the interface charge transfer resistance.

The invention relates to a composite cathode for a solid-state battery. The composite cathode comprises a composite cathode sheet and an electrolyte membrane formed by coating solid-state electrolyteslurry on the composite cathode sheet. The composite cathode sheet is formed by coating composite cathode slurry on a cathode current collector. The solid-state electrolyte slurry comprises a polymerand a lithium salt in a mass ratio of 1 to 5. The composite positive electrode slurry comprises a positive electrode active material, a conductive agent, a binder, a polymer and a lithium salt in a mass ratio of 250 - 350: 5 - 35: 5 - 35: 1 - 5: 1. The invention effectively reduces the internal resistance of the interface, improves the interface impedance, reduces the ion transmission distance, thereby improving the capacity of the solid-state battery, effectively improving the tensile strength, and thus improving the capacity and safety performance of the solid-state battery. In addition, thesolid-state battery of the present invention is used in a plurality of battery systems such as NCM111, NCM523, NCM622, NCM811, LFP, LCO, and the like, and has a wide application range.

A method of inhibiting gas generation in battery formation and a lithium ion battery formed by adopting the method are disclosed. The method includes S1) pre-charging the lithium ion battery according to a preset voltage, S2) putting the pre-charged lithium ion battery into a vacuum device and performing vacuumizing treatment with a low vacuum degree, S3) feeding a protective gas into the lithium ion battery, S4) charging the lithium ion battery at a constant temperature after the protective gas is fed, and S5) putting the lithium ion battery charged in the step S4) into the vacuum device and performing vacuumizing treatment with a high vacuum degree. Gas generation due to electrolyte decomposition in a formation process of the lithium ion battery is effectively inhibited by the method, thus effectively avoiding a ballooning phenomenon, and providing safety for lithium ion battery production and application. In addition, the initial capacity of the battery is increased, the battery interface internal resistance is reduced, electrochemical performance stability of the battery is effectively improved and the cyclic life of the battery is greatly prolonged.

The invention provides a preparation method of a positive electrode material precursor. The preparation method comprises the following steps of A) mixing a nickel-containing compound, a cobalt-containing compound, a manganese-containing compound and water to obtain a mixed solution; B) mixing the mixed solution, a precipitant and a complexing agent, and performing co-precipitation reaction to obtain a Ni-Co-Mn precursor solution, wherein the Ni-Co-Mn precursor is shown in a general formula (I); and C) mixing an oxidization agent and the Ni-Co-Mn precursor solution during the co-precipitation reaction process, and performing partial oxidization reaction to obtain the positive electrode material precursor, wherein the positive electrode material precursor is a secondary spherical particle composite precursor formed by accumulating primary particles shown in the general formula (I) and a general formula (II), the general formula (I) is Ni<x>Co<y>Mn<1-x-y>CO<3>, the general formula (II) isNi<x>Co<y>Mn<1-x-y>O, 0<x<1, 0<y<1, and (x+y)<1.

The invention discloses a synthetic method for graphene-based three-dimensional polyaniline array nanocomposite, which is different from the previously reported methods. In the synthetic method, graphene and polyaniline are connected by chemical bonds rather by physical acting force. The graphene-based three-dimensional polyaniline array is a nanocomposite with an array structure. The invention further provides a synthetic method of the nanocomposite. The synthetic method comprises the following steps: finally adding aminobenzene monomer and an oxidant under acidic conditions so as to initiate in-situ polymerization to obtain the graphene polyaniline array. Different from the graphene-based three-dimensional polyaniline composite connected through physical adsorption, the nanocomposite has the advantages of being good in thermal stability, small in resistance, good in electric chemical property and the like.

The invention provides a positive electrode material precursor. The positive electrode material precursor has the general formula shown as formula (I): NixCoyMnzAl1-x-y-z (OH)2 (I), wherein the positive electrode material precursor is spherical particles composed of positive electrode material precursor hexagonal sheets, and positive electrode material precursor nano particles are compounded on the positive electrode material precursor hexagonal sheets. According to the method, the precursor of a ternary or quaternary positive electrode material is obtained, and the spherical particles are formed by the hexagonal sheets; the precursor hexagonal sheets are further compounded with the precursor nano particles, and the multi-layer hexagonal sheets and the nano particles on the surfaces thereof form spherical particles, so that the structure is complete and uniform, the processing performance of the positive electrode material can be effectively improved by virtue of the nano particles onthe surfaces of the hexagonal sheets, the structural stability of the positive electrode material is improved, and the cycling performance of the positive electrode material is improved; and the specific surface area of the material is increased by virtue of the nano particles on the surfaces of the hexagonal sheets, the internal resistance of the material in the circulation process is lowered, and the rate performance of the material is improved.

The invention belongs to the field of laser processing, and relates to an ultrafast laser three-dimensional micro-nanometer texturing method for the surfaces of copper foil current collectors on negative poles of lithium ion batteries. Ultrafast laser is adopted for three-dimensional micro-nanometer texturing of the surfaces of the copper foil current collectors; the screening process comprises the following steps: glaze copper foil current collectors and characteristic-different three-dimensional micro-nanometer textured copper foil current collectors are assembled with batteries; the performances of the batteries are tested to build a relation between the different three-dimensional micro-nanometer texturing characteristics and the performances of the batteries; and the three-dimensionalmicro-nanometer texturing characteristics for improving the performances of the batteries are screened, and are textured on the surfaces of the copper foil current collectors. The method is used formicro-nanometer texturing of the copper foil current collectors by the ultrafast laser to form functional surface microstructures on the surfaces of the current collectors; the characteristics and thefunctions thereof are improved; the copper foil current collectors and electrode materials are tightly engaged, so that the interface internal resistance and the volume change degree of the electrodematerials are reduced, the specific surface area of the current collectors and the adhesion quantity of the electrode materials are improved, the corrosion of the current collectors by electrolyte isreduced, and the performances of the batteries are improved; and the method is scientific and reasonable, and is accurate and reliable in result.

The invention discloses a solid-state lithium battery and a production method thereof.The solid-state lithium battery comprises a positive plate, a negative plate and a solid-state electrolyte, and the solid-state electrolyte is arranged between the positive plate and the negative plate; a polymer gel electrolyte is also arranged in at least one of the inside of the negative plate, between the negative plate and the solid electrolyte, the inside of the solid electrolyte, between the solid electrolyte and the positive plate, and the inside of the positive plate; and the polymer gel electrolyte in the solid battery can inhibit an interface reaction between the solid electrolyte and the positive and negative electrodes, and also can improve the mechanical toughness of the solid electrolyte and reduce the interface internal resistance among ceramic particles. The battery design can effectively reduce the internal resistance of the solid-state lithium battery and improve the safety and electrochemical performance of the battery.

The invention discloses a sodium-ion battery diaphragm and a preparation method thereof. The specific method comprises the following steps: adding a certain amount of mixed powder of PVDF and PAN (indifferent mass ratios) into an appropriate solvent; placing the mixture on a constant-temperature magnetic stirrer at a certain temperature, stirring the mixture for 2 hours to completely dissolve PVDF and PAN, then performing stirring at normal temperature for 12 hours to obtain uniform spinning solution with a certain concentration, placing the uniform spinning solution silently in a vacuum environment for a period of time, and removing bubbles in the spinning solution; and then sucking the spinning solution into an injector after standing and defoaming, preparing a PVDF / PAN composite nano-microporous diaphragm by utilizing an electrostatic spinning technology, and then drying and storing the prepared diaphragm for later use. The preparation method is simple in process and low in cost, and the prepared PVDF / PAN composite nano-diaphragm has the advantages of high ionic conductivity, high porosity, uniform pore size distribution, good electrolyte wettability, good cycle performance andthe like.

The invention discloses a preparation method of an integrated all-solid-state lithium ion battery. The preparation method comprises the following steps: preparation of a solid-state inorganic electrolyte, preparation of an organic-inorganic hybrid electrolyte and preparation of the all-solid-state lithium ion battery. The method has the advantages that a certain amount of electrolyte is added intothe electrode, and the electrode is artificially infiltrated into the electrolyte, so that the active contact sites of the electrode and the electrolyte are increased, and the mutual infiltration degree of the interface of the electrode and the solid electrolyte of the all-solid-state lithium ion battery after annealing treatment is deepened; more channels are provided for lithium ion conduction,and the interface internal resistance between the prepared all-solid-state lithium ion battery electrode and the electrolyte is reduced.

The invention discloses a graphene-modified copper foil electrode used for a power battery with a silica-based cathode. The copper foil electrode includes a copper foil base body, and the copper foilbase body is sequentially provided with a graphene buffering layer and an active material layer; the graphene buffering layer is formed on the copper foil base body and forms a flow gathering layer along with the copper foil base body; the active material layer is a silica-based alloy cathode coating layer, and the silica-based alloy cathode coating layer includes compound ingredients including C,Si, GeP5 and GeS, wherein the mass ratio of the compound ingredients including C, Si, GeP5 and GeS is (1-10):(1-10):(1-10):(1-10). The graphene-modified copper foil electrode has the advantages thatthe contact area between the flow gathering layer and the active materials is enlarged, and electronic migration potential barriers and interface internal resistance are reduced; the compatibility andbonding strength between the active materials and flow gathering bodies are enhanced; the physical, chemical and electrochemical properties are stable, and the stability of copper foil under an electrochemical condition and the battery safety are improved.

The invention provides a low-internal-resistance all-solid-state battery and a preparation method thereof. The low-internal-resistance all-solid-state battery comprises a positive electrode layer and a composite negative electrode layer, a solid electrolyte layer is arranged between the positive electrode layer and the composite negative electrode layer, the solid electrolyte layer and the positive electrode layer are integrally prepared through solidification, and the composite negative electrode layer comprises a negative electrode layer and a buffer layer; the buffer layer is composed of hard carbon and a conductive polymer, and the buffer layer and the negative electrode layer are integrally prepared. The hard carbon and the conductive polymer are used as the buffer layer, so that the problem of pole piece expansion in the charging and discharging process of the negative electrode is inhibited, the negative electrode is in good interface contact with the solid electrolyte, the interface stability between the solid electrolyte and the negative electrode is improved, and the interface internal resistance is reduced.

The invention discloses a negative electrode and a positive electrode for a lithium ion battery, and the lithium ion battery and a preparation method thereof. The negative electrode comprises a negative plate and a graphene / cellulose composite material layer on one side surface of the negative plate. The positive electrode comprises a positive plate and a graphene / cellulose composite material layer on one side surface of the positive plate. The graphene / cellulose composite material layer comprises graphene and cellulose. A coating can effectively inhibit the growth of dendritic crystals on thesurface of the negative plate so as to improve the cycle performance and safety performance of the battery; and the coating can effectively reduce the direct internal interface resistance of the surface of the positive and negative plates and an electrolyte so as to enhance the capacity of the corresponding battery. The lithium ion battery prepared by using the negative electrode and / or the positive electrode has high cycle capacity and cycle stability and good cycle safety. The preparation method for the lithium ion battery is simple in process, mild in reaction conditions, short in production cycle, and capable of realizing large-scale industrial production.

The invention relates to an electrochemical sensor for monitoring the nitrogen content. The sensor comprises a solid electrolyte layer which takes Y2O3-doped zirconia (YSZ) as a matrix material, and an auxiliary electrode layer which takes nitrogen-doped Y2O3 stabilized zirconia (YNSZ) formed by replacing partial oxygen ions in the YSZ with nitrogen ions as a matrix material. The invention furtherprovides a manufacturing method for the electrochemical sensor. A high-temperature surface nitriding treatment method is used for generating the YNSZ auxiliary electrode layer with a certain thickness in situ on the surface of the prepared YSZ solid electrolyte, so that the process is rapid and simple, the YNSZ auxiliary electrode layer is compact and pore-free and is tightly and firmly combinedwith the matrix of the YSZ solid electrolyte, the compatibility is good, and the interface resistance is small; and therefore, the nitrogen content electrochemical sensor with the excellent performance can be further obtained by means of the manufacturing method.

The invention provides a copper-aluminum composite material and a preparation method thereof. The copper-aluminum composite material comprises a Cu metal plate and an Al metal plate which are compounded into a whole through cold rolling. Before cold rolling compounding, Cu nano sol particles are evenly sprayed to the surfaces of the metal plates, rich active sites are formed through in-situ etching, a three-dimensional rough structure is constructed on the Cu and / or Al metal surface, and the copper-aluminum composite material is formed. The method comprises the steps that the Cu nano sol particles are synthesized through a sol-gel method; the Cu nano sol particles are evenly sprayed to the surfaces of the Cu and / or Al metal plates, rich active sites are formed through in-situ etching, thethree-dimensional rough structure is constructed on the Cu and / or Al metal surface, and the Cu and / or Al metal plates with the surfaces subjected to in-situ activation etching are obtained; and then the Cu and Al metal plates with the surfaces subjected to in-situ activation etching are subjected to cold rolling compounding solid state connection, and the copper-aluminum composite material is obtained. The copper-aluminum composite material and the preparation method thereof are simple in process, high in production efficiency and low in manufacturing cost.

The invention provides a lithium ion battery electrode and a preparation method thereof and a lithium ion battery. The preparation method of the lithium ion battery electrode comprises the following steps: carrying out pattern engraving treatment on the surface of a current collector by adopting a laser device; spraying an electrode material slurry on the surface of the current collector subjectedto pattern engraving treatment; and drying the current collector sprayed with the electrode material slurry to obtain the lithium ion battery electrode, wherein in the step 1, when the laser device is adopted to perform pattern engraving treatment on the surface of the current collector, an included angle between the laser head of the laser device and the surface of the current collector is 30-60degrees. According to the invention, laser treatment enables a current collector to generate a groove forming an angle with the surface of the current collector, and an electrode material can be fully embedded into the designed groove, so that the electrode material is difficult to fall off from the surface of the current collector; and according to the electrode prepared by the method, the contact area of the current collector and the electrode material is greatly increased, the resistance interface impedance is reduced, and the assembled battery is low in interface internal resistance and high in cycling stability.

The invention provides a multistage reaction system, a lithium ion multi-element positive electrode material precursor, a preparation method of the lithium ion multi-element positive electrode material precursor and a preparation method of a lithium ion multi-element positive electrode material. According to the multi-stage reaction system provided by the invention, two stages of reaction kettlesare arranged, a circulating device is arranged between the two stages of reaction kettles, the multi-element positive electrode material precursor prepared by the system and the preparation method iscontrollable and uniform in particle size, regular in morphology and high in tap density, and the structural stability of the positive electrode material can be improved; the primary particle interlayer spacing of the positive electrode material precursor is reduced, the specific surface area of the material is increased, and the tap density of the material is improved; and meanwhile, the processreduces the interface internal resistance of the positive electrode material in the circulation process, so that the electrochemical performance, especially the circulation performance and the rate capability, of the material are improved, the energy density of the lithium ion battery is improved, and the process is suitable for industrial batch production.

The invention relates to fabrication method and application of a nickel-fabric current collector, and belongs to the technical field of a flexible current collector. The fabrication method comprises the steps of taking gauze as a substrate, and sequentially performing roughing, sensitization, activation, reduction, chemical nickel plating and post-treatment process on the substrate so that a metalconductive nickel layer is uniformly coated on fiber of the substrate and the nickel-fabric current collector is fabricated. The pure-cotton absorbent gauze is sensitized and activated by a one-stepmethod, the operation program can be greatly simplified, and the qualified rate of a product is improved; a normal-temperature alkali chemical plating liquid is employed, the problem of plating liquidwaste caused by instability of the plating liquid under a high-temperature condition is prevented, the maintenance of a solution is facilitated, and operation is facilitated; and moreover, a lithiumion battery and a supercapacitor which are fabricated by employing the nickel-fabric current collector have the advantages of small interface internal resistance, high energy density and high pseudo capacitance, the production efficiency of the battery is greatly improved, the production cost is reduced, and the fabrication method is suitable for industrial production on a large scale.

The invention discloses a graphene substrate and a thin film lithium battery with the same. The thickness of the graphene substrate is 0.5-10 [mu]m, and the square resistance value of the graphene substrate is 0.1-2 ohm / sq. As the graphene substrate has extremely high conductivity, excellent mechanical strength and mechanical property, excellent thermal stability and super chemical stability, when the graphene substrate is applied to the thin-film lithium battery, perfect matching with a solid positive electrode material and a solid negative electrode material can be realized at the same time; therefore, the electrochemical corrosion defect of other metal collectors in the multiple charging and discharging processes of the battery can be avoided. As an excellent adhesion substrate of a solid positive electrode material and a solid negative electrode material, the graphene substrate provided by the invention can provide super-strong binding force between the positive electrode material and the negative electrode material, and does not generate any influence on normal vapor deposition of the positive electrode material, a solid electrolyte material and the negative electrode material of the thin-film lithium battery.

The invention discloses a preparation method of a composite negative electrode of a lithium battery. The preparation method comprises the following steps: S1, preparing an inorganic solid electrolyte through an electrostatic spinning method; S2, compounding zinc oxide, an organic solid electrolyte and a lithium salt to the surface of the inorganic solid electrolyte through a solution casting method to obtain a composite solid electrolyte; and S3, casting metal lithium in a molten state on one side of the composite solid electrolyte, and performing cold press molding to obtain the composite solid electrolyte-metal lithium composite negative electrode. The lithium battery negative electrode prepared by the invention has good conductivity and good flexibility.