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

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 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 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 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 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 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.