364results about "Chemical electrode manufacturing" patented technology

Disclosed are compositions and methods for alleviating the problem of reaction of lithium or other alkali or alkaline earth metals with incompatible processing and operating environments by creating a ionically conductive chemical protective layer on the lithium or other reactive metal surface. Such a chemically produced surface layer can protect lithium metal from reacting with oxygen, nitrogen or moisture in ambient atmosphere thereby allowing the lithium material to be handled outside of a controlled atmosphere, such as a dry room. Production processes involving lithium are thereby very considerably simplified. One example of such a process in the processing of lithium to form negative electrodes for lithium metal batteries.

This invention provides a hybrid nano-filament composition for use as an electrochemical cell electrode. The composition comprises: (a) an aggregate of nanometer-scaled, electrically conductive filaments that are substantially interconnected, intersected, or percolated to form a porous, electrically conductive filament network comprising substantially interconnected pores, wherein the filaments have an elongate dimension and a first transverse dimension with the first transverse dimension being less than 500 nm (preferably less than 100 nm) and an aspect ratio of the elongate dimension to the first transverse dimension greater than 10; and (b) micron- or nanometer-scaled coating that is deposited on a surface of the filaments, wherein the coating comprises an anode active material capable of absorbing and desorbing lithium ions and the coating has a thickness less than 20 μm (preferably less than 1 μm). Also provided is a lithium ion battery comprising such an electrode as an anode. The battery exhibits an exceptionally high specific capacity, an excellent reversible capacity, and a long cycle life.

Disclosed is a method of producing a hybrid nano-filament composition for use in a lithium battery electrode. The method comprises: (a) providing an aggregate of nanometer-scaled, electrically conductive filaments that are substantially interconnected, intersected, physically contacted, or chemically bonded to form a porous network of electrically conductive filaments, wherein the filaments comprise electro-spun nano-fibers that have a diameter less than 500 nm (preferably less than 100 nm); and (b) depositing micron- or nanometer-scaled coating onto a surface of the electro-spun nano-fibers, wherein the coating comprises an electro-active material capable of absorbing and desorbing lithium ions and the coating has a thickness less than 10 μm (preferably less than 1 μm). The same method can be followed to produce an anode or a cathode. The battery featuring an anode or cathode made with this method exhibits an exceptionally high specific capacity, an excellent reversible capacity, and a long cycle life.

Provided are an anode active material for a lithium secondary battery having high reversible capacity and excellent charge/discharge efficiency, comprising a complex composed of ultra-fine Si phase particles and an oxide surrounding the ultra-fine Si phase particles, and a carbon material; and a method for preparing the same. The present invention also provides a method for preparing an anode active material for a lithium secondary battery comprising producing a complex composed of ultra-fine Si particles and an oxide surrounding the ultra-fine Si particles by mixing a silicon oxide and a material having an absolute value of oxide formation enthalpy (ΔH_for) greater than that of the silicon oxide and negative oxide formation enthalpy by a mechanochemical process or subjecting them to a thermochemical reaction to reduce the silicon oxide; and mixing the Si phase-containing oxide complex and carbon material.

The invention features a rechargeable alkaline battery comprising an anode; a cathode; and an electrolyte; wherein at least one of anode, the cathode and the electrolyte includes a solid, ionically conducting polymer material, and methods for the manufacture of same.

A positive electrode active material for a non-aqueous electrolyte secondary battery of this invention includes: a lithium nickel composite oxide containing lithium, nickel, and at least one metal element other than lithium and nickel; and a layer containing lithium carbonate, aluminum hydroxide, and aluminum oxide, the layer being carried on the surface of the lithium nickel composite oxide. The lithium nickel composite oxide is composed such that the ratio of the nickel to the total of the nickel and the at least one metal element is 30 mol % or more. The layer is composed such that the amount of the lithium carbonate is 0.5 to 5 mol per 100 mol of the lithium nickel composite oxide. The total of aluminum atoms contained in the aluminum hydroxide and the aluminum oxide is 0.5 to 5 mol per 100 mol of the lithium nickel composite oxide.

The present invention aims to realize a battery having high output voltage, high energy density and excellent charge and discharge cycle characteristics through a constitution different from those of conventional batteries. Specifically, one of the following negative electrode base members is used as a negative electrode base member for lithium ion secondary batteries: a negative electrode base member wherein a metal film is formed on a support having an organic film; such a negative electrode base member wherein the surface layer of the organic film is covered with a metal oxide film; a negative electrode base member wherein a metal film is formed on a support having a composite film formed from a composite film-forming material containing an organic component and an inorganic component; and a negative electrode base member wherein a silica coating is formed, on a support having a photoresist pattern, from a silica film-forming coating liquid and a metal film is formed on the support after removing the photoresist pattern.

To provide a method for forming a storage battery electrode including an active material layer with high density in which the proportion of conductive additive is low and the proportion of the active material is high. To provide a storage battery having a higher capacity per unit volume of an electrode with the use of a storage battery electrode formed by the formation method. A method for forming a storage battery electrode includes the steps of forming a mixture including an active material, graphene oxide, and a binder; providing a mixture over a current collector; and immersing the mixture provided over the current collector in a polar solvent containing a reducer, so that the graphene oxide is reduced.

An active manganese dioxide electrode material that exhibits improved electrochemical performances compared with conventional manganese dioxide materials includes at least one dopant. The doped manganese dioxide electrode materials may be produced by a wet chemical method (CMD) or may be prepared electrolytically (EMD) using a solution containing manganese sulfate, sulfuric acid, and a dopant, wherein the dopant is present in an amount of at least about 25 ppm.

The number of steps is reduced in the formation process of an electrode. Deterioration of the electrode is suppressed. A highly reliable lithium secondary battery is provided by suppressing the deterioration of the electrode. A method for forming a negative electrode and a method for manufacturing a lithium secondary battery including the negative electrode are provided. In the method for forming the negative electrode, graphene oxide, a plurality of particulate negative electrode active materials, and a precursor of polyimide are mixed to form slurry; the slurry is applied over a negative electrode current collector; and the slurry applied over the negative electrode current collector is heated at a temperature higher than or equal to 200° C. and lower than or equal to 400° C. so that the precursor of the polyimide is imidized. The graphene oxide is reduced in heating the slurry to imidize the precursor of the polyimide.

The invention discloses a lithium metal negative electrode dual protection method and application. The method comprises the steps of: infiltrating a lithium metal negative electrode in a mixture of ametal halide and an additive, and forming a composite protective layer in situ on the surface of the lithium metal negative electrode, wherein the composite protective layer comprises combination of an alloy and an inorganic salt; and coating the surface of a membrane with an organic polymer solution to obtain a membrane having an inner surface coated with an elastic organic modifying layer. The lithium metal negative electrode dual protection method and application are simple to operate, high in controllability, low in raw material cost, easy to obtain the raw materials and low in cost, and can form a layer of stable composite protective layer at the surface of the lithium metal negative electrode. The protective layer can effectively inhibit the growth of the lithium dendrites and can reduce the side reaction generated by contact of the lithium metal negative electrode and the electrolyte, and the obtained modified lithium metal negative electrode is stable in cycle performance to effectively inhibit the generation of the dendrites of the lithium metal negative electrode and can be widely applied to the novel high specific energy electrochemical energy storage device, such as a lithium ion battery and a lithium-sulfur battery.

To provide graphene oxide that has high dispersibility and is easily reduced. To provide graphene with high electron conductivity. To provide a storage battery electrode including an active material layer with high electric conductivity and a manufacturing method thereof. To provide a storage battery with increased discharge capacity. A method for manufacturing a storage battery electrode that is to be provided includes a step of dispersing graphene oxide into a solution containing alcohol or acid, a step of heating the graphene oxide dispersed into the solution, and a step or reducing the graphene oxide.

To provide a storage battery electrode including an active material layer with high density that contains a smaller percentage of conductive additive. To provide a storage battery having a higher capacity per unit volume of an electrode with the use of the electrode for a storage battery. A slurry that contains an active material and graphene oxide is applied to a current collector and dried to form an active material layer over the current collector, the active material layer over the current collector is rolled up together with a spacer, and a rolled electrode which includes the spacer are immersed in a reducing solution so that graphene oxide is reduced.

A cathode material particle comprising a plurality of cathode material cores and each cathode material core having plurality of grains and each grain being uniformly covered with a nano-metal oxide layer, wherein a thickness of the nano-metal oxide layer is 1 nm to 100 nm. The cathode material has excellent safety (good thermal stability), high-capacity, good cycleability and-high-rate charging or discharging capability.

A battery capable of improving cycle characteristics is provided. An anode includes: an anode current collector, and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including silicon (Si), and including a pore group with a diameter ranging from 3 nm to 50 nm both inclusive, and the volumetric capacity per unit weight of silicon of the pore group with a diameter ranging from 3 nm to 50 nm both inclusive is 0.2 cm³/g or less, the volumetric capacity being measured by mercury porosimetry using a mercury porosimeter.

The claimed invention relates to electrical engineering, and in particular to production of rechargeable electrochemical energy storage devices of high specific power. Positive and negative electrodes for electrochemical energy storage device of high specific power according to the invention comprise active element interacting with aqueous alkaline electrolyte in the process of redox charge-discharge reactions made of electron-conductive electrolytic alloy having composition M_(l-x-y)O_xH_y, where M for positive electrode is nickel or nickel-based alloy, M for negative electrode—a metal out of the group: iron, nickel, cobalt or an alloy on the basis of a metal out of this group, x is atomic fraction of absorbed oxygen in the electrolytic alloy being within the limits of 0.01≦x≦0.4, for positive electrode preferably in the limits of 0.05≦x≦0.4, y is atomic fraction of absorbed hydrogen in the electrolytic alloy being within the limits of 0.01≦y≦0.4, for negative electrode preferably in the limits of 0.05≦y≦0.4, the said electrolytic alloy functioning simultaneously as current-carrying collector and as active material.

Electrochemical energy storage devices of high specific power according to three embodiments of the invention comprise at least one negative and one positive electrodes submerged in aqueous alkaline electrolyte and divided by a separator—a layer of ion-conductive but non electron-conductive material.

Enhancement of service life owing to increase in number of recharge cycles under conditions of elimination of ecological harmful cadmium is the technical result achieved by the invention.

Methods for making a recycled or refurbished electrode material for an energy-storage device are provided. One example method comprises harvesting a lithium-deficient electrode material from a recycling or waste stream, and replenishing at least some lithium in the lithium-deficient electrode material. A second example method comprises breeching an enclosure of a cell of an energy storage device, replenishing at least some lithium in a lithium- deficient electrode material of the cell, and sealing the enclosure of the cell.

Provided is a Ni—Fe battery comprising an iron electrode which is preconditioned prior to any charge-discharge cycle. The preconditioned iron electrode used in the Ni—Fe battery is prepared by first fabricating an electrode comprising an iron active material, and then treating the surface of the electrode with an oxidant to thereby create an oxidized surface.

A method and apparatus are disclosed wherein a battery comprises at least one electrode formed from a graphitic carbon nanostructured surface wherein the nanostructured surface consists of a plurality of nanoposts formed from graphitic carbon such that the graphitic nanoposts serve both as an operational feature (i.e., dielectric/electrode) and control feature of the battery itself. In one embodiment, the nanostructured surface consists of a plurality of nanoposts wherein a select portion of each nanopost is formed to serve as the dielectric of the nanostructured battery, and the balance of each nanopost is utilized to impart the control features to the nanostructured battery.

A method for making a solid state cathode comprises the following steps: forming an alkali free first solution comprising at least one transition metal and at least two ligands; spraying this solution onto a substrate that is heated to about 100 to 400° C. to form a first solid film containing the transition metal(s) on the substrate; forming a second solution comprising at least one alkali metal, at least one transition metal, and at least two ligands; spraying the second solution onto the first solid film on the substrate that is heated to about 100 to 400° C. to form a second solid film containing the alkali metal and at least one transition metal; and, heating to about 300 to 1000° C. in a selected atmosphere to react the first and second films to form a homogeneous cathode film. The cathode may be incorporated into a lithium or sodium ion battery.

[Problem] By obtaining a compound hydroxide that has a sharp particle diameter distribution, the present invention aims to improve the cycle properties of a nonaqueous electrolyte secondary cell obtained using the nickel-cobalt compound hydroxide as the precursor. [Solution] In the present invention, a slurry contains a nickel-cobalt compound hydroxide that is obtained by reacting and continuously feeding to a reactor an aqueous solution containing at least nickel and cobalt, an aqueous solution that serves as an ammonium ion donor, and an aqueous caustic alkali solution. The slurry is continuously extracted and the slurry is separated by grading into large particle diameter portions and small particle diameter portions. The small particle diameter portion is continuously circulated back to the reactor. The resulting nickel-cobalt compound hydroxide is represented by the general formula Ni1-x-yCoxMy (OH)2 (where 0.05 ≤ x ≤ 0.50, 0 ≤ y ≤ 0.10, 0.05 ≤ x + y ≤ 0.50, M is at least one metal element selected from Al, Mg, Mn, Ti, Fe, Cu, Zn, and Ga), wherein the correlations of (D50-D10)/D50 ≤ 0.30 and (D90-D50)/D50 ≤ 0.30 are established between D10, D50, and D90.

The invention discloses a method for realizing in-situ growth of cobalt-manganese double-metal hydroxide composite material through using nickel foam as a substrate. The method comprises the steps ofperforming in-water ultrasonic dispersion of cobalt salt, manganese salt, urea and ammonium fluoride to uniform, thereby obtaining cobalt-manganese double-metal hydroxide precursor solution; immersingthe preprocessed nickel foam into the cobalt-manganese double-metal hydroxide precursor solution, performing a hydro-thermal reaction, and after reaction, performing filtering, washing and drying forobtaining a nickel foam/cobalt-manganese double-metal hydroxide composite electrode material. The composite material according to the invention has advantages of excellent conductive performance, stable chemical property and controllable morphology. The needle-shaped cobalt-manganese double-metal hydroxide is uniformly arranged on the three-dimensional nickel foam, thereby sufficiently increasingspecific surface area of the composite material. Furthermore the prepared composite material does not require a binder in electrochemical testing, thereby realizing simple and convenient operation. The material can be used as an ideal supercapacitor, a high-performance electrocatalysis material and an electrode material of new energy devices such as a lithium ion battery.