126results about How to "Improve the effect of current collection" patented technology

A lithium secondary battery has a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode has a negative electrode current collector and a negative electrode mixture layer containing a negative electrode conductive agent, a negative electrode binder, and negative electrode active material particles made of a material containing silicon. The negative electrode mixture layer is sintered and disposed on the negative electrode current collector. The negative electrode active material particles have an average particle size of from 5.0-15.0 μm before being charged. The negative electrode conductive agent is made of a graphite material having an average particle size of from 2.5-15.0 μm. The amount of the graphite material added is from 3-20 mass % with respect to the negative electrode active material. The theoretical electrical capacity ratio of the positive electrode to the negative electrode is 1.0 or less.

The invention relates to a rear-contact solar cell and to a method for producing the same. The rear-contact solar cell comprises a semiconductor substrate on the rear side surface of which emitter regions, contacted by emitter contacts, and base regions, contacted by base contacts, are defined. The emitter regions and the base regions overlap at least in overlap regions, the emitter regions in the overlap regions reaching deeper into the semiconductor substrate than the base regions, when seen from the rear side surface of the solar cell. As a result, a large area percentage of the rear side of the semiconductor substrate can be covered with a charge-collecting emitter, said emitter being at least partially buried in the interior of the semiconductor substrate so that there is no risk of the base contacts provoking a short circuit towards the buried emitter regions.

The invention relates to a lithium-sulfur battery positive pole material and a preparation method thereof, and belongs to the technical field of battery materials. The provided positive pole material has abundant micropores and mesopores; porous nano carbon thin sheets with a three-dimensional communicated net structure are taken as the skeleton; nano sulfur dots are filled into the pores of the net structure, and the outer layer of the skeleton is wrapped by reduced oxidized graphene. The preparation method comprises the following steps: mixing porous nano carbon thin sheets with a sulfur single substance, subjecting the mixture to ball milling, carrying out reactions at a temperature of 180 to 200 DEG C in an enclosed environment in the absence of oxygen and water under the protection of inert gas to obtain a porous nano carbon thin sheet/nano sulfur compound; dissolving the compound into an ethanol solution, dispersing the compound by ultrasonic waves, adding oxidized graphene, adjusting the pH to 10.1 by ammonia water, carrying out ultrasonic dispersion, carrying out hydrothermal reactions at a temperature of 80 to 100 DEG C, filtering, washing the reaction product until the reaction product becomes neutral, and drying to obtain the positive pole material. The positive material has the advantages of high specific capacity and stable electrochemical circulation performance, moreover, the preparation method is simple, the price is low, and the positive material is environment-friendly and can be easily produced in batches.

Provided are a three-dimensional net-like aluminum porous body in which the diameter of cells in the porous body is uneven in the thickness direction of the porous body; a current collector and an electrode each using the aluminum porous body; and methods for producing these members. The porous body is a three-dimensional net-like aluminum porous body in a sheet form, for a current collector, in which the diameter of cells in the porous body is uneven in the thickness direction of the porous body. When a cross section in the thickness direction of the three-dimensional net-like aluminum porous body is divided into three regions of a region 1, a region 2 and a region 3 in this order, the average cell diameter of the regions 1 and 3 is preferably different from the cell diameter of the region 2.

The invention relates to a flexible cell based on metallic oxide/graphene composite macroscopic fibers and a preparation method. The preparation method comprises the following steps: after mixing an anionic metal oxide aqueous solution with graphene oxide to obtain a spinning solution, adding the spinning solution in wet spinning equipment to obtain nascent fibers; repeatedly washing the obtained nascent fibers with deionized water, and drying the nascent fibers to obtain metallic oxide and graphene oxide composite fibers; reducing the metallic oxide and graphene oxide composite fibers with hydroiodic acid, and then washing and drying the metallic oxide and graphene oxide composite fibers to obtain the metallic oxide and graphene composite fibers; placing the composite fibers, lithium lines and lithium manganate loaded carbon cloth fibers in a shrinkable tube in parallel; and adding diaphragms and electrolyte so that half cells and total cells can be assembled respectively. The preparation process is simple and controllable, and large-scale production is facilitated. The metallic oxide and graphene composite fibers which are prepared by the preparation method for the first time have unlimited prospects in the field of energy storage of flexible cells.

The invention belongs to the technical field of solid oxide fuel cells, and discloses an anti-carbon metal-supported solid oxide fuel cell and a preparation method thereof. The anti-carbon metal-supported solid oxide fuel cell comprises a porous catalytic reforming layer, a porous metal supporting layer, a porous anode functional layer, a dense electrolyte layer and a porous cathode layer which are sequentially and tightly combined; wherein the porous catalytic reforming layer comprises a Ni-M alloy and an oxygen storage-water absorbing oxide; the porous metal supporting layer comprises a Ni-Malloy and MgO; and the porous anode functional layer comprises a Ni-M alloy and a fluorite structural oxide or comprises a Ni-M alloy and a (ionic conductive) perovskite structural oxide. The invention further discloses the preparation method of the corresponding cell. When hydrocarbons are used as fuel, the anti-carbon metal-supported solid oxide fuel cell can operate steadily in a long term inthe hydrocarbon fuel, and the fuel cell has low preparation process cost, is suitable for large-area single cells and scale production and manufacturing, and has broad application prospects.

A negative electrode (2) for a lithium secondary battery having a negative electrode current collector (21) having an arithmetical mean surface roughness Ra of 0.01 μm or greater and a negative electrode active material layer (22) formed on the negative electrode current collector (21). The negative electrode active material layer (22) contains a negative electrode active material (22a) including a material capable of alloying with lithium. A conductive layer (23) including a material not intercalating or deintercalating lithium is formed on the negative electrode active material layer.

The invention discloses a lithium ion power battery with bidirectional current collectors, which comprises a battery case (1). A battery core electrode group (100) is arranged in the battery case (1). An anode current collector (31) and a cathode current collector (32) are fixedly arranged at the upper and lower ends of the battery core electrode group (100) respectively. Cylindrical terminal posts (300) are arranged at the left and right ends of each of the anode current collector (31) and the cathode current collector (32) respectively. Battery covers (2) are arranged on the outer surfaces of the anode current collector (31) and the cathode current collector (32). The lithium ion power battery with the bidirectional current collectors adopts bidirectionally led-out external current collector structures, realizes a shortest current path and uniform current density, has increased energy density, improved rate discharge performance and relatively better current collection effect, and can be widely applied in the field of traffic and transportation.

The invention discloses a negative current collector, a negative pole piece and an electrochemical device. The negative current collector comprises a support layer and a conductive layer arranged on at least one of two opposite surfaces in the thickness direction of the support layer, wherein the density of the support layer is smaller than that of the conductive layer; the thickness D1 of the conducting layer is larger than or equal to 300 nm and smaller than or equal to 2 micrometers, and preferably, D1 is larger than or equal to 500 nm and smaller than or equal to 1.5 micrometers. When thetensile strain of the negative current collector is 1.5%, the square resistance growth rate T of the conductive layer is less than or equal to 5%. The negative electrode current collector provided bythe invention can simultaneously consider low weight and good conductivity and current collection performance, so that the electrochemical device can simultaneously consider relatively high weight energy density and good comprehensive electrochemical performance.

The invention discloses a method for preparing the anode of a high-power nickel-hydrogen battery. The method comprises the following steps: a) weighing a fixed quantity of an active substance; b) adding a defined amount of nanometer-scale conductive agent to the active substance, mixing and stirring the nanometer-scale conductive agent and the active substance to form a powder mixture; c) placing the powder mixture into an ultrasonic dispersion machine for ultrasonic vibration so that the nanometer-scale conductive agent is uniformly absorbed on the surface of the active substance; d) filling the powder mixture onto a foam nickel substrate in a physical filling manner; and e) spot-welding current collectors on the foam nickel substrate to finally obtain the anode. The nanometer-scale conductive agent is added to anode material, thereby reducing the internal resistance of the battery, efficiently promoting the conducting efficiency of an anode, promoting the high-power discharging property of the battery, shortening the activating period of the battery and improving the consistency of the battery.

This invention relates to a Li sub-battery cathode carrier. Composition and content of the slurry include 3-9 acetylene black, 0.2-1.5 Cu-electrolyte powder and 20-120 adhesives. The prepared-slurry is pressed to format or stacked on an under-pan to be caked and foamed for at least 15h under 180deg.C-200deg.C to increase its mechanical structure performance of the cathode carrier.

The invention discloses an anode lug bending and sealing body press-in device for a cylindrical lithium battery, which is characterized by comprising an anode lug bending mechanism and a press-in mechanism, wherein the press-in mechanism is positioned right above a sealing port to be pressed in; the anode lug bending mechanism comprises a limiting assembly and an ejecting and pressing rod; the limiting assembly is positioned at one side of an anode lug; the ejecting and pressing rod is positioned at the other side of the anode lug; the limiting assembly is provided with a space for accommodating the bent anode lug; the space is provided with an opening which is towards the anode lug; and in the bending process, the anode lug is ejected and pressed by the ejecting and pressing rod to generate bending deformation and the bent anode lug enters the space from the opening. The anode lug bending and sealing body press-in device for the cylindrical lithium battery has the advantages that the device has good controllability; after the anode lug is bent and the sealing body is pressed into a steel shell of the battery, the anode lug is generally of an S shape; the battery leakage phenomenon caused by the case the anode lug is clamped between the steel shell of the battery and a sealing ring is avoided; the anode lug has a good current collecting effect; discharge capacity of the lithium battery can be effectively ensured; and the produced lithium battery has good sealing performance.

The invention discloses a lithium battery negative electrode and a lithium battery negative electrode current collecting method. The lithium battery negative electrode includes a lug (1) and a metal negative electrode (2). Steps of lithium battery negative electrode current collecting comprise: placing the lug (1) on one side of the metal negative electrode (2), wherein the lug (1) is wrapped by the metal negative electrode (2), using a press machine to planish the part of the lug (1), wrapped by the metal negative electrode (2) under certain pressure, to obtain the negative electrode. The method has relatively simple operation, and is low in cost and easy in realization. On the premise of ensuring current collecting effect, proportion of non-active substances in a battery is effectively reduced, thereby facilitating improvement of energy density of the lithium battery. The method and has large industrial and commercial application value.

The invention discloses a novel wound lithium-ion battery with high capacity and high power performance and a manufacturing method thereof. In the technical proposal of the novel wound lithium-ion battery, an electrode group is arranged in a shell to form an electrode group winding device; the electrode group comprises a cathode plate, a diaphragm and an anode plate, which are stacked in sequence; the diaphragm covers the cathode plate from the bottom thereof; and the end surfaces of the anode and the cathode of the electrode group are respectively welded with an anode ear and a cathode ear. The manufacturing method of the novel wound lithium-ion battery comprises the following steps; at first, the cathode plate, the diaphragm and the anode plate are sequentially stacked to form the electrode group; the metal foil bodies preset on the anode plate and the cathode plate being stacked are arranged in the opposite directions; the anode plate and the cathode plate are stacked in sequence and wound to form a circular electrode group; then the anode ear and the cathode ear are respectively welded on the upper end surface and the lower end surface of the electrode group; and finally the assembly is completed. The invention adopts the novel winding method of 'first stacking, then winding' when the electrode group is wound, thereby realizing high capacity and high power performance.

The invention relates to a lithium battery, which is made up of a shell, a bottom film, metal lithium negative electrode, side film, a positive electrode cover, a upper cover film, flow gathering barrel, sealed pin, connecting nickel band, top cover, a glass insulator, a positive end. the character lies in: one end of the flow gathering pin or the gathering pole is connected to a metal flow gathering ring, forms the multiple flow gathering body to replace the flow gathering barrel, the pin or the pole are inserted into the positive electrode cover. The uncontrollable change of positive electrode size and shape can be avoided when inserting the flow gathering barrel into the positive electrode cover, the uniformity and controllability of the battery can be improved, and the performance is improved.

The invention discloses a current collector and a lithium ion battery containing the current collector. The current collector comprises a conductive layer, an insulating layer and a reinforcing layer,wherein the number of the conducting layers is two, an insulating layer is arranged between the two conducting layers, and a reinforcing layer used for reinforcing conductivity is further arranged between the conducting layers and the insulating layer. The conductive layer, the enhancement layer and the insulating layer are compounded by adopting vacuum electroplating or electrolytic electroplating; the conductive layer is made of a metal material, wherein the thickness of the conductive layer is 0.1-1 [mu]m; the insulating layer is made of an organic polymer insulating material, wherein thethickness of the insulating layer is 2-8 microns; the enhancement layer is made of at least one of a carbon-based conductive material and a nano conductive ceramic material, wherein the thickness of the enhancement layer is 0.1-1 micron. The insulating layer is arranged between the two conductive layers, and the reinforcing layer is arranged between the conductive layers and the insulating layer,so the weight of the current collector is reduced, the conductivity of the current collector is ensured, the toughness of the current collector can be improved, and the consistency and safety of products are improved.

In a method for manufacturing a metal-made three-dimensional substrate, a metal foil is passed between a pair of rollers 21 and 22 . Each surface S of a pair of the rollers 21 and 22 is provided with protrusion portions 23 arranged in a grid pattern, and the protrusion portions 23 are arranged so that protrusions 23 of the one roller 22 are oriented toward the center 27 of a virtual quadrangle having four adjacent protrusion portions 23a to 23d of the other roller 21 as the apices.

The invention provides a film photovoltaic solar cell component and a manufacturing method thereof. A flexible solar cell comprises at least two flexible photovoltaic solar cell units. Each of the flexible photovoltaic solar cell units comprises a flexible battery substrate, a semiconductor material layer and a light receiving layer which are orderly stacked. The light receiving layer is provided with a conductive bus bar. The series connection mode of the two adjacent flexible photovoltaic solar cell units is that ohmic connection is formed between the conductive bus bar of one flexible photovoltaic solar cell conductive bus bar and the substrate of the other flexible photovoltaic solar cell to realize series connection. The invention also discloses a manufacturing method of an interconnected type flexible solar cell. The process operation is simple, ohmic contact is easy to form, and the safety performance is good.