12results about How to "Reduce interfacial internal resistance" patented technology

The invention belongs to the technical field of lithium ion batteries, and relates to a high-load positive pole piece, a preparation method and a high-specific-energy battery. The positive pole piece is an electrode of a double-layer structure and comprises a current collector, a first electrode layer and a second electrode layer, wherein the first electrode layer and the second electrode layer are far away from the current collector. The specific gravity of the active substance small-particle single crystal ternary material of the first electrode layer is smaller than that of the large-particle polycrystalline ternary material, and the specific gravity of the active substance small-particle single crystal ternary material of the second electrode layer is larger than that of the large-particle polycrystalline ternary material. According to the dual-structure electrode plate, Li < + > migration paths are distributed in a tortuous gradient mode, large and small particles have a synergistic effect, a rapid electrolyte diffusion channel and a rapid lithium ion diffusion channel are achieved, the first electrode layer serves as a rapid transmission layer, the second electrode layer serves as a reaction balance layer, the concentration polarization problem in a thick electrode is effectively solved, the positive electrode capacity can be brought into play, and the service life of the electrode plate is prolonged. The battery energy density is improved. Meanwhile, the prepared positive electrode slurry is heated, high solid content is achieved, the use amount of a solvent is reduced, cracking of a high-load pole piece during coating is prevented, simultaneous coating and integrated preparation of the first electrode layer and the second electrode layer are achieved through the double-layer coating die head, and the interface internal resistance is reduced.

The invention belongs to the technical field of lithium ion batteries, and discloses a method for preparing a self-repairing polysilazane gel electrolyte by an in-situ polymerization method at room temperature and application of the self-repairing polysilazane gel electrolyte. The gel electrolyte is composed of glycidyl ether monomers containing two or more terminal group ethylene oxide, amine monomers, an initiator, a solvent and a lithium salt, wherein one of the two monomers at least contains a Si-O bond component. The method can be used for in-situ preparation of the gel electrolyte on the surfaces of the positive and negative electrodes of the lithium metal battery. The method provided by the invention is simple and easy to implement, can polymerize at the temperature of about room temperature, and can be used for large-scale production. Through the dynamic balance property of siloxane in a polysilazane network, the gel electrolyte has a certain self-repairing capability. In addition, the gel electrolyte based on in-situ polymerization has good matching performance with common positive electrode materials such as LiFePO4, high-voltage NCM811 and the like, and the assembled button cell shows excellent cycle performance and rate capability.

The present application relates to the technical field of conductive foil, specifically to a multilayer composite conductive foil and its preparation method and application, specifically comprising the following steps: S1. aluminum foil is immersed in NaOH solution and then cleaned with deionized water, dried to obtain pretreated aluminum foil; S2. using a magnetron sputtering instrument, using a Ti-Zn-C-Ni composite target material to sputter the pretreated aluminum foil, and obtaining a transition layer conductive foil after deposition; S3. the modified functional slurry is coated on the surface of the transition layer conductive foil by a doctor blade coater, then added to an oven for segmented curing, and then annealed, and after cooling to room temperature, a multilayer composite conductive foil is obtained. The present application forms a strong adhesion bottom layer with the substrate through the composite process design of sputtering and coating, blocks the corrosion of electrolyte to the substrate, and also bears the conductive and catalytic functions. The two functional layers obtained by the two processes are further fused through annealing treatment, forming a gradient interface, eliminating interlayer stress, and improving the overall structural stability.

The invention provides a lithium-carbon composite material, a preparation method thereof and a negative electrode containing the lithium-carbon composite material. The lithium-carbon composite material comprises a carbon sintered porous skeleton containing carbon nanotubes and silver wires, wherein gaps of the carbon sintered porous skeleton are filled with lithium alloy and metal lithium. The lithium-carbon composite material disclosed by the invention is high in structural strength (tensile strength) and suitable for industrial production. In addition, the negative electrode adopting the lithium-carbon composite material disclosed by the invention is high in energy density and stable in structure in a battery cycle process, so that the cycle life of the battery is long.

This invention provides a bipolar electrode and a bipolar all-solid-state battery. The bipolar electrode comprises a positive electrode film, a current collector, a bulk material layer, and a carbon material layer. Through the design of the carbonaceous framework and nucleating agent in the bulk material layer, efficient and dense lithium metal deposition is achieved under high voltage conditions. The carbon material layer significantly improves the interfacial contact between the bulk material layer and the all-solid-state electrolyte, reduces interfacial resistance, and improves the deposition and extraction efficiency of lithium metal in the bulk material layer. Furthermore, the carbon material layer provides storage space for lithium metal deposited from the positive electrode, mitigating volume changes during lithium metal deposition in the bulk material layer and improving the stability of the bipolar electrode. The bipolar all-solid-state battery fabricated using the bipolar electrode exhibits high rate capability and long lifespan.

The invention relates to a current collector module and a preparation method thereof, an electrode plate and a battery. The preparation method comprises the following steps: providing a current collector; performing plasma activating treatment on the surface of the current collector; and depositing a bonding enhancement layer on the surface of the current collector subjected to plasma activation treatment to obtain a current collector module, wherein the thickness of the bonding enhancement layer is less than 1 [mu] m. The current collector module prepared by the preparation method of the current collector module provided by the invention has relatively good bonding performance, and can effectively bond the active material layer, so that the electrode plate has relatively good use performance.

The invention relates to the technical field of battery materials, in particular to a porous carbon composite material and a preparation method thereof, a negative pole piece and a solid-state battery. The preparation method of the porous carbon composite material comprises the following steps: preparing a metal ion salt solution A containing a lithium source, a lanthanum source and a zirconium source, and preparing a precipitant solution B containing a precipitant; mixing the metal ion salt solution A, the precipitant solution B and the porous carbon material, so that the lithium source, the lanthanum source, the zirconium source and the precipitant are uniformly distributed in pores of the porous carbon material to obtain a precursor solution C; enabling a lithium source, a lanthanum source and a zirconium source to react with a precipitator through a coprecipitation method to generate lithium lanthanum zirconium oxide, and depositing the lithium lanthanum zirconium oxide in pores of the porous carbon material to obtain the porous carbon composite material. After the porous carbon composite material prepared by the invention is prepared into a negative pole piece and is assembled into a solid-state battery, the solid-state battery shows the advantages of high discharge capacity, good cycle performance, low interface internal resistance and high safety, and large-scale industrial application of the solid-state battery is facilitated.

The present invention provides a composite structure electrode and a preparation method and application thereof, which belongs to the field of electric vehicle power batteries. The composite structure electrode provided by the present invention uses a current collector, a positive electrode active material, a solid electrolyte material, a conductive agent and an auxiliary agent as preparation raw materials, performs an isostatic pressing treatment at a temperature not higher than 600°C, and then coats the solid electrolyte material and the auxiliary agent, and performs a secondary isostatic pressing treatment at a temperature not higher than 600°C in the presence of an auxiliary organic solvent to obtain the electrode. The composite structure electrode provided by the present invention can effectively avoid the reaction of the interface between the oxide electrolyte and the positive electrode active material during the preparation process, and avoid the phenomenon of crystal structure phase transformation when the positive electrode active material is secondary sintered under high temperature conditions.

The application provides a battery aluminum foil and a preparation method thereof, and relates to the technical field of battery aluminum foils.The preparation method is as follows: S1, hot rolling of an aluminum foil blank to obtain an aluminum foil intermediate body with a thickness of 3.5-4.1 mm; S2, multi-pass cold rolling of the aluminum foil intermediate body under ultrasonic vibration system using lubricating oil to obtain a foil rolling blank with a thickness of 0.35-0.45 mm, wherein, when the cold rolling is rolled to an intermediate pass thickness of 0.6-0.9 mm, complete recrystallization annealing is carried out under nitrogen protection, and the annealing temperature is 400-450 DEG C; S3, foil rolling of the foil rolling blank to obtain an aluminum foil with a thickness of 0.01-0.015 mm; and S4, corona treatment of the aluminum foil, coating of modified paint on the surface of the aluminum foil, drying, and obtaining of the battery aluminum foil.The battery aluminum foil has excellent electrochemical performance, high strength, and high surface roughness.

The application provides a composite manganese-based positive electrode material, a preparation method thereof and a lithium ion battery, and the composite manganese-based positive electrode material comprises a manganese-containing positive electrode material and a coating layer coated on the surface of the manganese-containing positive electrode material, and the coating layer comprises a dioxole-containing organic matter and a 2-oxazolidone-containing organic matter. The manganese-containing positive electrode material is modified by the dioxole-containing organic matter and the 2-oxazolidone-containing organic matter, and the surface of the manganese-containing positive electrode material is physically formed into a film under the action of physical adsorption, which makes the ethylene oxide free radicals in the dioxole-containing organic matter and the 2-oxazolidone in the 2-oxazolidone-containing organic matter rapidly crosslink with each other in the charging and discharging process, so that a uniform, thin and stable CEI film with small polarization degree is formed on the surface of the positive electrode material, the dissolution of manganese is effectively inhibited, the interface resistance is reduced, and the cycle and rate performance of the positive electrode material are improved.

The invention discloses a solid-state battery charging method and a prepared solid-state battery, and the solid-state battery charging method comprises the following steps: S1, assembling a negative electrode plate, an electrolyte composite material containing an organic solvent, a positive electrode plate and a shell into a battery cell; s2, performing staged formation on the assembled battery cell: in a first stage, under a negative pressure condition, performing constant-current charging to reach a metal lithium deposition starting potential; in the second stage, under the negative pressure condition, charging is performed until the battery reaches 100% SOC, and meanwhile, the organic solvent in the battery electrolyte composite material is discharged until the electrolyte is gelatinized or fully cured; and in the third stage, the battery is discharged to discharge cut-off voltage, and the shell is sealed. The negative electrode, the electrolyte composite material layer and the positive electrode can be integrated, the interface internal resistance of the electrolyte, the positive electrode and the negative electrode is effectively reduced, dendritic crystals are avoided, the power density of the battery is improved, and stable SEI can be formed at the negative electrode through staged formation, so that the cycle life of the battery is prolonged.

This application provides an electrolyte, a secondary battery, and an electrical device. The electrolyte includes a lithium salt, a non-aqueous solvent, a first additive, and a second additive. The first additive is a compound having a structure as shown in Formula I: Formula I, where n is a natural number, 1 ≤ n ≤ 8. The second additive includes at least one of lithium difluorooxalatoborate, lithium difluorodioxalatophosphate, and lithium fluorosulfonate. Adding a trithiocarbonate additive containing cyano and trimethoxysilane substituents, as well as a lithium salt-based second additive, to the electrolyte can significantly improve the interfacial stability and reduce the interfacial internal resistance of the secondary battery, thereby enhancing the electrochemical performance of the secondary battery at high voltages.