54 results about "Interfacial resistance" patented technology

The invention provides high-wettability glass powder, a preparation method of the high-wettability glass powder and BC battery conductive silver paste, and belongs to the technical field of photovoltaic battery paste. The glass powder comprises the following components in parts by mass: 50-60 parts of a first component, wherein the first component is PbO and Bi2O3; 30 to 40 parts by mass of a second component, wherein the second component is TeO2 and SiO2; the third component is prepared from the following components in parts by mass: Li2CO3, Na2CO3 and K2CO3; and 0.1 to 5 parts by mass of a fourth component, wherein the fourth component is at least one of MoO3, In2O3, SeO2, WO3, Al2O3 and ZnO. The glass powder disclosed by the invention has good wettability, and the problems of high interface resistance and low filling factor caused by non-uniform thickness of a glass layer in the prior art are solved.

This invention provides a functional current collector, its preparation method, and its application, belonging to the field of battery materials technology. The functional current collector comprises a stacked metal layer, a metal-carbon composite layer, and a carbon layer. Starting from the material and structural design of the functional current collector, this invention introduces a metal-carbon composite layer between the carbon layer and the metal layer. This not only reduces the amount of metal used and increases energy density but also enhances mechanical properties, achieving excellent flexibility and tensile strength. Furthermore, the metal-carbon composite layer significantly reduces interfacial resistance and improves the adhesion between the carbon layer and the metal layer. In addition, the metal-carbon composite layer exhibits good resistance to electrolyte corrosion, improving the stability of each interface and ensuring good structural stability of the functional current collector, thus enhancing its stability during battery use. The bipolar battery prepared based on this method exhibits excellent cycle performance.

The present invention relates to a positive electrode including a positive electrode active material layer including a first positive electrode active material and a second positive electrode active material having an average particle diameter different from each other, in which the average particle diameter D50 of the first positive electrode active material is larger than the average particle diameter D50 of the second positive electrode active material, the first positive electrode active material and the second positive electrode active material include single-particle-type particles, the interface resistance of the positive electrode having a SOC of 50% measured in a coin half cell manufactured using the positive electrode is 6.5 Omega to 8.5 Omega, and the interface resistance of the positive electrode having a SOC of 10% measured in a coin half cell manufactured using the positive electrode is 15 Omega to 19 Omega.

This invention provides an anode material, its preparation method, and its application. The anode material includes a silicon-carbon material and a modified coating layer covering the surface of the silicon-carbon material. The silicon-carbon material includes a core and a carbon layer covering the surface of the core. The core includes porous carbon and silicon deposited in the pores of the porous carbon. The modified coating layer, in the direction away from the silicon-carbon material, sequentially includes a first coating layer and a second coating layer. The first coating layer is made of tin and tin sulfide, and the second coating layer is made of a tin-modified sulfide solid electrolyte. Tin compensates for irreversible capacity loss and improves first-time efficiency. Tin and tin sulfide have high ionic conductivity, and the "point-to-surface" conductive network formed by tin and the carbon layer can significantly reduce interfacial resistance. The plasticity of the tin-modified sulfide solid electrolyte itself can optimize the interfacial contact between the anode and the electrolyte, reduce interfacial impedance, and buffer the volume expansion stress of the silicon material during charging and discharging. The synergistic effect of the above structures can effectively suppress the volume expansion of the silicon material.

The present invention relates to an all-solid-state battery structure and a manufacturing method therefor, the structure comprising: a pressing jig including first and second plates facing each other; an all-solid-state battery interposed between the first and second plates; and a pad positioned between the first plate and the all-solid-state battery and / or between the second plate and the all-solid-state battery, wherein the pad sequentially includes a first pad and a second pad having different hardnesses, the second pad being closer than the first pad to the all-solid-state battery, and the ratio of Shore A hardness of the second pad to Shore A hardness of the first pad is 1.8 to 5. Pressurization can be uniform and all-solid-state battery damage is controlled while interfacial resistance between layers is lowered, and thus an all-solid-state battery structure having excellent discharge capacity characteristics, high-rate discharge efficiency and cycle performance, and a manufacturing method therefor can be provided.

This invention discloses a functionalized carbon coating slurry for lithium batteries and its preparation method, relating to the field of lithium battery materials technology. The method includes the following steps: preparing a multifunctional aminobenzoate-modified polyacrylate copolymer aqueous dispersion, comprising polymerizing monomers including acrylic acid, butyl acrylate, and ethyl para-aminobenzoate intermediates via free radical copolymerization; preparing a conductive pre-dispersion, comprising mixing a conductive agent, a dispersant, and deionized water under high-speed shear dispersion conditions; and preparing the functionalized carbon coating slurry, comprising mixing the conductive pre-dispersion with the multifunctional aminobenzoate-modified polyacrylate copolymer aqueous dispersion under planetary stirring conditions, followed by static degassing. This invention achieves chemical bonding between the coating components through a multifunctional binder, significantly improving coating adhesion, toughness, and high-temperature stability, while reducing interfacial resistance, thus comprehensively improving the battery's cycle performance, rate performance, and processing reliability.

To provide a dry electrode having high dispersibility of a conductive material.SOLUTION: The dry electrode obtained by the manufacturing method according to the present disclosure has high dispersibility of the conductive material in the electrode active material layer. Accordingly, when the content of the conductive agent in the electrode is constant, the internal resistance of the electrode active material layer and the interfacial resistance with the current collector are reduced as the dispersibility is higher. Also, in a case in which the dry electrode having high dispersibility is applied to a battery, since ohmic resistance is reduced during the operation of the battery, a voltage drop may be improved, and high output efficiency may be improved. In a case in which the dispersibility of the conductive agent is extremely poor, the deterioration of the electrode active material may be non-uniform depending on the position in the electrode, which is disadvantageous for the life characteristics of the battery. In addition, the evaluation tool according to the present invention can confirm the dispersibility of the conductive material in the electrode as a quantitative value.SELECTED DRAWING: Figure 1

According to an embodiment, an electrode is provided, comprising a current collector and an active material layer located on the current collector. The active material layer contains an active material and a conductive agent. The active material comprises a lithium nickel cobalt manganese composite oxide. The specific surface area S of the active material layer obtained by nitrogen adsorption is... BET The specific surface area S of the micropores containing the active material layer obtained by mercury intrusion porosimetry Hg Satisfying 0.8 BET / S Hg The relationship is <2.0. The volume resistivity R of the layer containing the active material is... V The interfacial resistance R at the interface between the current collector and the layer containing the active material is below 10 Ω·cm. I 0.5Ω·cm 2 Below. Volume resistivity R V With interface resistance R I The ratio of R V / R I 3cm ‑1 Above and 20cm ‑1 the following.​

This invention discloses an oil-based conductive slurry, its preparation method, and its application. The oil-based conductive slurry comprises an oil-based solvent, a conductive material, and an oil-based binder. The oil-based binder is polyvinylidene fluoride (PVDF), and the conductive material is one or a mixture of several of acetylene black, Ketjen black, conductive carbon black, conductive graphite, graphene, and carbon nanotubes. The oil-based conductive slurry is coated on both sides of an aluminum foil and dried to obtain a coating on the aluminum foil, resulting in a carbon-coated current collector. The carbon-coated current collector is used to prepare a positive electrode sheet. The uniform distribution of the conductive material in the oil-based solvent forms a continuous conductive network, which effectively reduces the surface resistance of the aluminum foil, promotes rapid electron conduction, and improves the charge / discharge efficiency and energy density of the battery. The formation of a conductive carbon layer between the aluminum foil and the positive electrode coating reduces the interfacial resistance and improves conductivity.

The application belongs to the technical field of solid-state battery manufacturing, and relates to a manufacturing method of a low-interface-resistance solid-state battery, comprising the following steps: 1) preparing a positive electrode material, a solid-state electrolyte material and a negative electrode material; 2) preparing composite positive electrode powder and solid-state electrolyte raw material based on the prepared positive electrode material and solid-state electrolyte material respectively; 3) forming a solid-state battery positive electrode and a solid-state battery electrolyte by using an indirect 3D printing process respectively; 4) assembling the formed solid-state battery positive electrode and solid-state battery electrolyte to form an assembly; and 5) introducing the negative electrode material to the assembly to form a solid-state battery. The application provides a manufacturing method of a low-interface-resistance solid-state battery which can improve interface wettability, can improve ion conductivity and can realize batch manufacturing.

The invention relates to the technical field of battery manufacturing, and discloses a battery welding process based on screw fixation and soldering tin conduction, and the process comprises the following steps: applying a solid dormant soldering flux composition to a to-be-connected area, and curing to form a film; the connecting piece is fixed through cold pressing and riveting, and the scaling powder film is broken through mechanical force so as to expose the internal active agent in situ; low-temperature welding flux is preset on the base part of the connecting piece; and local low-temperature heating is conducted, so that the welding flux is melted and infiltrated under the action of the active agent, and a conductive path is formed. The composition comprises a frangible polymer matrix and an active agent coated by the matrix. A force and chemical cooperation mechanism is established, the scaling powder is activated through mechanical force, and the technical problem that the surface of the aluminum alloy is difficult to wet by low-temperature solder is solved; and meanwhile, local low-temperature heating avoids thermal damage of high temperature to the battery cell, and safe and reliable battery connection with high mechanical strength and low interface resistance is realized.

The invention provides a lithium ion secondary battery. The electrolyte in the lithium ion secondary battery comprises an isothiocyanate additive; the oxidation potential of the isothiocyanate additive is 3.7 to 4.1 V, the fluorine ion affinity is-11 to-7 kcal / mol, and the LUMO (lowest unoccupied molecular orbital) energy level is-2.2 to-1.1 eV; the positive electrode active material of the positive plate comprises LiaNixCoyMzAdO2, wherein 0.85 < = a < = 1, 0.8 < = x < = 1, 0.05 < = y < = 0.15, 0 < z < = 0.05, and 0 < = d < = 0.05; m comprises Mn and / or Al, and A comprises at least one of Mg, Ca, Sr, Ba, Al, Sc, Ga, In, Ti, Zr, Sn, Hf, Ta, Nb, W, Mo, V, Cr, Y, La, Ce, Pr and Nd. The lithium ion secondary battery has excellent cycle performance and relatively low interface resistance at a high temperature.

This invention discloses a self-supporting, high-efficiency OER Mo / Ru-Ni / NF electrocatalyst and its preparation method, belonging to the field of electrocatalytic materials technology. Addressing the problems of insufficient exposure of active sites, poor conductivity, and high interfacial resistance due to the need for binders in existing catalysts, this invention uses nickel foam as a substrate and employs a two-step electrodeposition method combined with a calcination process to prepare a composite catalyst with a cauliflower-like porous structure. This material optimizes the electronic structure and oxygen intermediate adsorption energy by introducing strongly electron-deficient Mo centers to modify the Ru-Ni heterojunction interface; the unique self-supporting porous structure increases the active area, promoting mass transfer and electron transport. This catalyst requires no binder, exhibits low overpotential, a small Tafel slope, and excellent long-term stability, significantly improving the catalytic performance of the oxygen evolution reaction (OER) and making it suitable for high-efficiency water electrolysis for hydrogen production.

The present invention relates to a lithium secondary battery comprising: a positive electrode; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and an electrolyte, wherein the positive electrode includes first and second positive electrode active materials having different average particle diameters (D50). The average particle diameter (D50) of the first positive electrode active material is larger than the average particle diameter (D50) of the second positive electrode active material. The first and second positive electrode active materials include single particle type particles. The negative electrode includes a silicon-based negative electrode active material, and the lithium secondary battery has an interfacial resistance factor (IRF) value defined by the following Equation 1 of 1 to 1.4. In Equation 1, each variable is the same as described in the specification. [Equation 1].

This invention discloses an organochlorosilane-modified zinc electrode sheet, its preparation method, and its application, belonging to the field of aqueous zinc-ion battery technology. The preparation method specifically includes the following steps: (1) acid washing and alcohol washing of the zinc electrode sheet sequentially; (2) arranging the electrode sheet on a glass petri dish and drop-coating with organochlorosilane; (3) sealing the top and treating with high temperature; (4) cooling to room temperature and allowing it to stand, washing with alcohol, and allowing it to stand again to obtain the electrode. The organochlorosilane-modified layer of this invention has hydrophobic properties and possesses zinc-loving ion sites. The zinc electrode sheet (OTS-Zn) prepared thereby has lower interfacial resistance, good cycle stability, and rate performance, improving problems such as dendrite growth and hydrogen evolution reaction at the interface of traditional zinc anodes.

The invention discloses urea-coated titanium dioxide nanowire powder, a preparation method and application of the urea-coated titanium dioxide nanowire powder in a rigid-flexible matrix digital controllable intelligent material. The preparation method of the urea-coated titanium dioxide nanowire powder comprises the following steps: adding anatase type titanium dioxide nanowire powder into a saturated urea solution for ultrasonic treatment, and then carrying out heating treatment, standing and drying to obtain the urea-coated titanium dioxide nanowire powder. Compared with the prior art, wetting and dispersion of the urea-coated titanium dioxide nanowire powder in silicone oil are improved, agglomeration of the urea-coated titanium dioxide nanowire powder in an electric field is reduced, and interface resistance is improved to inhibit injection and micro-discharge, so that electric leakage is reduced, breakdown field strength is improved, response is faster, delay is smaller, and more stable electrorheological performance is kept under damp and hot and circulating conditions.

The invention discloses a ternary lithium battery stability analysis method, device and equipment, a medium and a product, and relates to the field of lithium battery stability analysis, and the method comprises the following steps: storing a ternary lithium battery in-situ electrochemical cell within a preset time period and at a preset temperature; in the storage process, circuit parameters and the concentration of each gas are obtained in real time, and the interface resistance value is obtained at an interval preset sampling frequency; obtaining the content of each component in the positive pole piece and the negative pole piece after storage; performing principal component analysis on the acquired circuit parameters, the concentration of each gas, the interface resistance value and the content of each component in the pole piece to obtain parameters remarkably related to the stability degradation of the ternary lithium battery; according to the obtained values of the parameters significantly related to the stability degradation of the ternary lithium battery, the stability degradation time period is determined, and the stability analysis efficiency can be improved.

This application belongs to the field of electrocatalysis and photoelectrocatalysis materials technology, specifically relating to a nickel phosphide-iron phosphide self-supporting electrode, its preparation method, and its application. This application provides a method for preparing a nickel phosphide-iron phosphide self-supporting electrode, which directly constructs an active layer on a conductive nickel foam substrate through in-situ hydrothermal growth combined with a gas-phase phosphating strategy. The nickel foam not only acts as a conductive current collector but also participates in the growth of the precursor as a reaction substrate, enhancing the bonding force between the active layer and the substrate, completely avoiding the use of binders, and effectively reducing interfacial resistance. The phosphating treatment transforms the nickel-iron precursor into a phosphide with metal-like properties, significantly improving the electrode's conductivity and intrinsic catalytic activity, thereby solving the problem of slow reaction kinetics.

A modified current collector for a secondary battery includes a substrate and a conductive layer applied to one or both sides of the substrate, in which the conductive layer includes a conductive material and a binder material, in which the binder material includes a fluorine-containing copolymer. The invention also discloses conductive layer slurry which can be used for preparing a conductive layer of a modified current collector. Within the electrode containing the modified current collector, the presence of the conductive layer inhibits corrosion of the substrate and reduces interface resistance between the electrode layer and the substrate. In addition, the fluorine-containing copolymer makes the conductive layer waterproof, and when the aqueous electrode layer is formed on the conductive layer, the conductive layer can be prevented from being disintegrated. Therefore, the battery comprising the electrode shows excellent electrochemical performance.

This invention provides a technique for reducing the interfacial resistance between the current collector and the electrode composite layer while maintaining the mechanical strength of the electrode composite layer. [Solution] The electrodes of the battery include a current collector and an electrode composite layer disposed on the current collector, which includes active material particles and a binder. The electrode composite layer includes a first electrode composite layer disposed directly on the current collector and a second electrode composite layer disposed directly or indirectly on the first electrode composite layer. In at least the second electrode composite layer, at least a portion of the binder is fibrillated. The degree to which the binder in the second electrode composite layer is fibrillated is higher than the degree to which the binder in the first electrode composite layer is fibrillated.

This invention belongs to the field of solid-state battery technology, and relates to a P / Sn compound modified solid-state electrolyte, its preparation method, and its application. A lithium layer is deposited on the surface of LLZTO, and a modified layer is disposed between the lithium layer and LLZTO. The modified layer is composed of a lithium-tin alloy and lithium phosphostane. The preparation method is as follows: Sn4P3 powder is coated onto the surface of LLZTO to form a Sn4P3 powder layer; a lithium metal layer is attached to the surface of the Sn4P3 powder layer to obtain a composite precursor material; the composite precursor material is heat-treated at 350–450°C under an inert atmosphere to obtain the final product. This invention can effectively reduce the interfacial resistance between the solid-state electrolyte and the negative electrode, improve the inhibition of lithium dendrite growth, and improve cycle performance.

The present invention relates to an electrode comprising an electrode current collector and an electrode active material layer on the electrode current collector wherein the electrode active material layer comprises an electrode active material, a single-walled carbon nanotube structure, a first dispersant comprising a hydrogenated nitrile-based copolymer, and a second dispersant comprising a hydrogenated nitrile-based copolymer, the second dispersant contains a fluorine-based polymer, the average diameter of the single-walled carbon nanotube structure is 60 nm to 300 nm, and the interfacial resistance between the electrode active material layer and the electrode current collector, as measured by a multi-probe resistance (MP resistance) measurement method, is 0.43 Omega * cm2 or less.

This invention relates to current collectors and electrodes and secondary batteries including the same, said current collector comprising an underlayer containing a conductive material, a binder, and a thickener (wherein the conductive material has a BET specific surface area of ​​170 m²). 2 ( / g or larger multi-walled carbon nanotubes), thus exhibiting excellent adhesion strength to the electrode active material layer, low interfacial resistance and excellent scratch resistance.

The present invention relates to an electrode for an energy storage device and an energy storage device comprising same. More specifically, when manufacturing an electrode for an energy storage device by a dry process, calendering process conditions can be changed to control the degree of fiberization of a binder to improve the porosity, tensile strength, or interfacial resistance of the electrode and thereby improve the energy density of the energy storage device.

To provide NCM positive electrode particles coated with LLZO and a glass phase.SOLUTION: NCM (lithium nickel manganese cobalt oxide) large particles, wherein the NCM large particles have a glass phase on the outside of the NCM large particles, the glass phase is used to prevent the NCM large particles from directly contacting the electrolyte, and the glass phase is used to reduce interfacial side reactions, and at the same time, the glass phase reduces the interfacial resistance when lithium ions enter and leave the NCM large particles, and a plurality of LLZO fine particles distributed in the glass phase or on the surface of the glass phase to form a composite NCM particle as a whole. The periphery of the composite NCM particles is covered with a plurality of carbon nanotubes, and positive electrode particles covering the carbon nanotubes are formed. The plurality of nano-scale amorphous carbon is coated on the outside of the positive electrode particles coated with the carbon nanotubes, and is located in gaps formed by the plurality of carbon nanotubes crossing each other.SELECTED DRAWING: Figure 1

This invention discloses a solar cell, its grid structure, a grid fabrication method, a tandem cell, and a photovoltaic module, belonging to the field of photovoltaic technology. The grid structure of this invention includes a first metal layer and a second metal layer. The first metal layer serves as a seed layer and uses a first paste. Along the length of the grid line, the surface profile of the first metal layer includes alternately distributed raised and recessed regions, wherein there is a height difference between the raised and recessed regions. The second metal layer uses a second paste, and metal particles of different sizes are interleaved within the second metal layer. The silver content of the first paste is greater than that of the second paste, and the first and second metal layers at least partially overlap or intersect. This invention optimizes the surface morphology and horizontal surface roughness distribution of the first metal layer, thereby effectively reducing the silver content in the paste and the battery manufacturing cost, while also reducing the interfacial resistance between the two metal layers and preventing an increase in the line resistance of the solar cell.

The present invention pertains to the field of battery technology and provides a 3DP-nano-micro composite electrode material for high-performance lithium-ion storage, along with its preparation method. In this disclosure, a the V2O5—Ti2C3—Au nanocomposite cathode material featuring a hierarchical heterostructure for high-performance lithium ion energy storage is disclosed, comprising a 3D-printed V2O5—Ti2C3—Au cathode, in which an in-situ TiO2 interface forms via synergistic interactions between V2O5, Ti2C3Tx, and Au nanoparticles. The TiO2 interface introduces abundant oxygen vacancies that act as Li+ adsorption sites. Au nanoparticles contribute to interfacial redox dynamics, catalysis, and conductivity, forming Au—Ti intermetallics that act as conductive bridges, reduce interfacial resistance, and reinforce mechanical stability. The 3D-printed nanocomposite cathode is manufactured by DIW printing technology, which can accurately control the structure and spatial distribution of the active material, thereby shortening the ion / electron pathway and improving the electrochemical kinetics.

The application discloses a solid-state laminated aluminum electrolytic capacitor with a transition conductive layer, and a core comprises a plurality of single pieces arranged in a stack; the single piece comprises a positive electrode area and a negative electrode area; the negative electrode area comprises an aluminum foil, an oxide film formed on the aluminum foil, a polymer conductive polymer layer, a transition layer and a negative electrode lead-out layer, the polymer conductive polymer layer is formed on the surface of the oxide film of the negative electrode area, and the transition layer is arranged between the polymer conductive polymer layer and the negative electrode lead-out layer; the transition layer comprises a polymer conductive polymer, carbon powder and graphene nanosheets, and the weight of the graphene nanosheets and the carbon powder in the transition layer accounts for 2.5%-10% of the weight of the polymer conductive polymer. In the application, the transition layer is arranged between the polymer conductive polymer layer and the negative electrode lead-out layer, so that the interfacial resistance between the polymer conductive polymer layer and the negative electrode lead-out layer can be effectively reduced; and the overall conductivity of the composite cathode is increased by about 10%-30% compared with the case without the transition layer.

To provide a secondary battery excellent in impact resistance, and a manufacturing method thereof.SOLUTION: A positive electrode, a negative electrode, and an exterior body that accommodates the positive electrode and the negative electrode, wherein the positive electrode and the exterior body, and the negative electrode and the exterior body are connected to each other at at least two locations on one side of the exterior body, the value of the interfacial resistance is 2.0 * 10-3 Ω·cm2 or less, the value of the interfacial resistance being obtained by performing inverse problem analysis using measured potentials obtained by measuring the surfaces of the negative electrode active material layers with a plurality of measuring probes and calculated potentials calculated by a model of electrodes composed of the current collector layers, the active material layers, and the interfacial resistance layers.SELECTED DRAWING: Figure 1

One embodiment of the present invention relates to a negative electrode material and a secondary battery including same, the negative electrode material comprising: a first layer; a second layer disposed on one surface of the first layer; and a third layer disposed on a surface of the second layer facing away from the first layer, wherein the first layer includes lithium metal, the second layer includes carbon, and the third layer includes a lithiophilic material, and wherein a carbon coating layer and a coating layer including a lithiophilic material are disposed on the surface of the negative electrode material, thereby reducing interfacial resistance of lithium metal and improving lifespan characteristics.