405results about "Electrode molding" patented technology

Provided are an all-solid state battery with a better quality of contact among particles of an active material and with an enhanced discharge capacity; an electrode for an all-solid state battery; and a method of manufacturing the same. The all-solid state battery is manufactured through the steps of: causing a deliquescent solid electrolyte to deliquesce, the deliquescent solid electrolyte having ionic conductivity, electronic conductivity and a deliquescent property; preparing an electrode mixture by mixing the deliquescent solid electrolyte having deliquesced and an active material together; heat-treating and shaping the electrode mixture to produce an electrode; and bonding the thus-produced electrode and a solid electrolyte layer with the solid electrolyte layer interposed between the electrode and another electrode which are paired to serve as a positive electrode and a negative electrode.

The invention relates to an anode for lithium secondary battery comprising vapor grown carbon fiber uniformly dispersed without forming an agglomerate of 10 μm or larger in an anode active material using natural graphite or artificial graphite, which anode is excellent in long cycle life and large current characteristics. Composition used for production for the anode can be produced, for example, by mixing a thickening agent solution containing an anode active material, a thickening agent aqueous solution and styrene butadiene rubber as binder with a composition containing carbon fiber dispersed in a thickening agent with a predetermined viscosity or by mixing an anode active material with vapor grown carbon fiber in dry state and then adding polyvinylidene difluoride thereto.

A manufacturing method for a non-aqueous electrolyte secondary battery includes: forming a powder; forming a sheet-like green compact; and forming a heat-resistant layer. The powder contains composite particles and a solvent. The composite particles contain inorganic filler particles and a binder. The green compact is formed by pressing the powder in a state in which the solvent remains. The heat-resistant layer is formed by disposing the green compact on a surface of at least any of a positive electrode mixture layer and a negative electrode mixture layer after the green compact is formed.

A method for making an electrode including a particle based film is disclosed in which the film is coated and/or impregnated with veins of conductive material. A support backing is placed adjacent to one side of the film to provide support and prevent damaging the film while the conductive material is applied onto the opposite side of the film. The film is bonded directly to a current collector of an energy storage device.

The present invention is directed to battery technologies and processing techniques thereof. In various embodiments, ceramic electrolyte powder material (or component thereof) is mixed with two or more flux to form a fluxed powder material. The fluxed powder material is shaped and heated again at a temperature less than 1100° C. to form a dense lithium conducting material. There are other variations and embodiments as well.

An electrochemical battery cell comprising a cell housing defining an inner space, a first terminal and a second terminal; and at least one pre-formed pellet disposed within the inner space of the cell housing. The pellet includes an outer electrode portion formed from a material to geometrically define the pellet in a solid form. The outer electrode portion is in electrical communication with the first terminal of the cell housing. The pellet also includes an inner electrode encapsulated by a separator and embedded within the material of the outer electrode portion. The inner electrode is in electrical communication with the second terminal of the cell housing and electrically insulated from the outer electrode material. In a preferred embodiment, the inner electrode comprises an anode and the outer electrode portion comprises a cathode portion. The integrated anode/cathode pellet configuration facilitates lowers costs, a more robust design and ease of manufacturability while maintaining and allowing increased performance characteristics of the battery cell.

The present invention relates to a method for preparing a lithium vanadium phosphate material comprising mixing water, lithium dihydrogen phosphate, V₂O₃ and a source of carbon to produce a first slurry; wet blending the first slurry; spray drying the wet blended slurry to form a precursor composition; milling the precursor composition to obtain a milled precursor composition; compacting the milled precursor to obtain a compacted precursor; pre-baking the compacted precursor composition to obtain a precursor composition with low moisture content; and calcining the precursor composition with low moisture content at a time and temperature sufficient to produce a lithium vanadium phosphate. The lithium vanadium phosphate so produced can optionally be further milled to obtain the desired particle size. The electrochemically active lithium vanadium phosphate so produced is useful in making electrodes and batteries and more specifically is useful in producing cathode materials for electrochemical cells.

The non aqueous secondary battery electrode of the present invention includes a mixture layer and a porous layer formed on the surface of the mixture layer. The mixture layer includes an electrode material expressed by the composition formula SiO_x where x in the composition formula satisfies 0.5≦x≦1.5, a conductive material and at least one binder selected from the group consisting of polyimide, polyamideimide and polyamide. The porous layer includes an insulating material unreactive with Li.

A graphite particle obtained by assembling or binding together a plurality of flat-shaped particles so that the planes of orientation are not parallel to one another, or a graphite particle in which aspect ratio is 5 or less or specific surface area is 8 m2/g or less or the size of crystallite in the direction of c-axis of the crystal is 500 Å or more and the size of crystallite in the direction of plane is 1,000 Å or less as measured by X ray broad angle diffraction, or a graphite particle in which pore volume of the pores having a size falling in a range of 102 to 106 Å is 0.4 to 2.0 cc/g per weight of graphite particle or pore volume of the pores having a size falling in a range of 1x102 to 2x104 Å is 0.08 to 0.4 cc/g per weight of graphite particle is suitable for production of negative electrode of lithium secondary battery, and a lithium secondary battery obtained therefrom is excellent in rapid charge-discharge characteristics, cycle characteristics, etc.

The present invention generally relates to batteries and, in particular, to electrodes for use in batteries such as non-aqueous metal-air batteries, for example, lithium-air batteries, as well as in other electrochemical devices. Such devices may exhibit improved performance characteristics (e.g. power, cycle life, capacity, etc.). One aspect of the present invention is generally directed to electrodes for use in such devices containing one or more pores or channels for transport of gas and/or electrolyte therein, e.g., forming an open porous network. In certain embodiments, the electrolyte may be a gel or a polymer. In some embodiments, there may be network of such channels or pores within the electrode such that no active site within the electrode is greater than about 50 micrometers distant from a gas channel. In some embodiments, such systems may be created using electrodes containing gel or electrolyte polymers, and/or by forming electrodes having different wettabilities such that certain regions preferentially attract the electrolyte compared to other regions, thereby causing self-organization of the electrolyte within the electrode. Other aspects of the invention are generally directed to methods of making such batteries or electrochemical devices, methods of using such batteries or electrochemical devices, kits involving such batteries or electrochemical devices, or the like.

The invention provides a buffer layer for a sulfide solid-state battery. The buffer layer comprises a polymer material and ethylene carbonate, and is formed in situ on an electrode plate through a buffer layer solution; and due to the existence of a polymer, poor physical contact between an electrode and an electrolyte caused by volume deformation of a positive electrode material in a charging/discharging process can be improved. The buffer layer is existent between the positive electrode and the solid electrolyte of the solid-state battery and between the negative electrode and the solid-state electrolyte, so that the solid-solid interface impedance can be reduced; and meanwhile, good ionic conductivity of the buffer layer can improve the lithium ion transmission capacity. The sulfide composite positive electrode in the solid-state battery provided by the invention contains the polymer material, and the existence of the polymer can improve the poor physical contact between the electrode and the electrolyte caused by the volume deformation of the positive electrode material in the charging/discharging process; and meanwhile, the solid-state battery contains the buffer layer, so that the solid-state battery has low interface resistance and high ionic conductivity, and is excellent in capacity and cycling performance.

The invention discloses a production method of a composite lithium ribbon. Roll forming is adopted, a protection film is adopted to cover a lithium ribbon or a lithium alloy ribbon during rolling, and the protection film, the lithium ribbon or the lithium alloy ribbon and a current collector synchronously run during roll production. A rolling machine is adopted for roll forming and provided with a rack, an upper roller and a lower roller are mounted on the rack, a current collector unwinding device, a lithium ribbon unwinding device and a protection film unwinding device are arranged on the upper reach of the rollers, an unwinding guide roller is arranged on the lower reach of the protection film unwinding device, a composite lithium ribbon winding device and a protection film winding device corresponding to the protection film unwinding device are arranged on the lower reach of the rollers, and a winding guide roller is arranged on the uppe reach of the protection film winding device. Rolling technology is adopted, the protection film is adopted to protect the lithium ribbon or the lithium alloy ribbon in the process of production, automatic roll production can be realized, small-amount piece production can be realized, production efficiency can be improved greatly, and product quality is well guaranteed.

An electrode plate for a secondary battery with a nonaqueous electrolyte composed of a collector and an active material layer which is formed of at least an active material and a binder disposed on the collector, and said electrode plate is provided with a terminal mounting portion provided with a collector surface exposed to mount a terminal. In such electrode plate, the exposed collector surface of the terminal mounting portion has the same shape and size substantially as those of an area to which the terminal is actually mounted. The electrode plate may further be provided with an identification mark made by forming the active material layer in shape of pattern on an area at which the collector surface is exposed or by exposing the collector surface in the shape of pattern on an area at which the collector is covered with the active material layer.

An electrochemical battery cell in accordance with the invention has a high electrode interfacial surface area to improve high rate discharge capacity, and the shapes of the electrodes facilitate the manufacture of cells of high quality and reliability at high speeds suitable for large scale production. The interfacial surfaces of the solid body electrodes have radially extending lobes that increase the interfacial surface area. The lobes do not have sharp corners, and the concave areas formed between the lobes are wide open, to facilitate assembly of the separator and insertion of the other electrode into the concave areas without leaving voids between the separator and either electrode.

The invention relates to a composite current collector with electrical interconnection and a through-hole structure, a preparation method thereof, battery pole pieces and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method of the composite current collector includes the following steps: (1) coloring, casting and forming to prepare a polymer base layer; (2) carrying out first vacuum metal plating on the surface of the polymer base layer; (3) making holes in the surface of the metal-coated polymer layer; and (4) carrying out second vacuum metal plating on the surface of the polymer layer. The prepared current collector is of an inner and outer double-layer structure with the through-hole structure. The inner layer is a polymer layer withthe through-hole structure, and the surface layers are metal coatings. The metal coatings cover the surface of the through holes, the through holes communicate the metal coatings. The preparation method is simple and easy in large-scale production, and can customize the thickness and hole structure distribution according to specific application indicator. Compared with a conventional foil material, the composite current collector with the electrical interconnection and the through-hole structure has the advantages of light weight, bending resistance, low cost and the like, and has a significant effect on the energy density improvement of the battery.

A nonaqueous electrolyte secondary battery includes: a positive electrode collector core material; and a sheet body including a plurality of granulation bodies. The sheet body is disposed on the positive electrode collector core material. The granulation bodies each contain a first positive electrode active material particle, a second positive electrode active material particle, and expanded graphite, the first positive electrode active material particle including lithium-nickel composite oxide, the second positive electrode active material particle including lithium iron phosphate.

The invention discloses a production method of an ultrathin lithium belt. The production method comprises the following steps: S10, diaphragm pre-cooling: reducing the temperature of a cell diaphragm in advance by a pre-cooling device; S20, lithium ingot melting: raising the temperature of a metal lithium ingot by a heating device so as to convert the solid metal lithium into melt lithium liquid; S30, lithium liquid coating: coating the melt lithium liquid over the surface of the pre-cooled cell diaphragm; S40, diaphragm final cooling: reducing the temperature of the cell diaphragm, which has been coated by the lithium liquid, by a final cooling device so as to solidify the lithium liquid to form a lithium belt. The invention further discloses production equipment using the preparation method mentioned above to produce ultrathin lithium belts. The provided production method and production equipment of ultrathin lithium belt replace the conventional ultrathin lithium belt production mode, which produces ultrathin lithium belt through rolling and pressing, thus solve the problems of color fading and uncontrollable thickness uniformity of ultrathin lithium belt during the rolling and pressing process, and can produce ultrathin lithium belts simply, high efficiently, and reliably.

A method for producing an electrode assembly includes: obtaining a porous active material molded body by molding a constituent material containing a lithium multiple oxide in the form of particles by compression, and then performing a heat treatment at a temperature of 850° C. or higher and lower than the melting point of the used lithium multiple oxide; forming a solid electrolyte layer by applying a liquid containing a constituent material of an inorganic solid electrolyte to the surface of the active material molded body including the inside of each pore of the active material molded body, and then performing a heat treatment; and bonding a current collector to the active material molded body exposed from the solid electrolyte layer.