37results about How to "Excellent cycle characteristics" patented technology

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

A battery includes: a first electrode; a second electrode; and an electrolyte solution, wherein the first electrode includes a current collector and an active material layer, the active material layer contains BiNi, and the BiNi has a crystal structure, a space group of the crystal structure belonging to C2 / m.

A separator for an energy storage device is provided, comprising: a porous substrate, a layer containing inorganic filler disposed on a first main surface of the porous substrate, and a layer containing a thermoplastic polymer disposed on the surface of the layer containing inorganic filler and on a second main surface of the porous substrate, wherein the coverage area S of the layer containing thermoplastic polymer on the surface of the layer containing inorganic filler is provided. c The coverage area S of the thermoplastic polymer-containing layer on the second main surface of the porous substrate is between 30% and 100%. p The thickness t of the thermoplastic polymer layer on the inorganic filler layer exceeds 0% and is less than 30%. c The thickness t of the thermoplastic polymer-containing layer on the second main surface of the porous substrate p Satisfy t c / t p The relationship is >1.00.

An object of the present application is to provide a battery active material capable of maintaining good initial coulombic efficiency and cycle characteristics and increasing discharge capacity to, for example, 800 mAh / g or more, a battery composite active material containing the battery active material, and a secondary battery containing these materials in a negative electrode. The battery active material of the present application is an amorphous silicon-based material composed of elements including Si, O, and C, and has a solid solution structure in which Si, O, and C are mixed at the atomic level. The battery active material of the present application is characterized by having a specific surface area of 0.1 m2 / g or more and less than 20 m2 / g, a pore volume of 0.01 cm3 / g or more and less than 0.5 cm3 / g, and a pore diameter of 2 nm or more and less than 20 nm. 29 The ratio (A / B) of the total value A of the integral values of the respective peaks attributed to SiO2C2 and SiO3C to the integral value B of the peak attributed to SiO4 in the range of chemical shifts 20 ppm to -150 ppm of the Si-NMR spectrum is 0.5 or more and 5.0 or less.

This invention provides a lithium secondary battery, comprising: a battery casing; an electrode assembly housed within the battery casing; and an electrolyte, wherein the electrode assembly includes a positive electrode comprising a positive electrode active material, a separator, and a negative electrode comprising a negative electrode active material, and the electrolyte comprises LiPF6 as a lithium salt and ethylene carbonate as an organic solvent, wherein the ratio of the diameter (r) to the height (h) of the battery casing of the lithium secondary battery (shape factor ratio) is 0.4 or more, and satisfies the condition of mathematical formula (1), wherein in mathematical formula (1), h is the height (mm) of the battery casing, r is the diameter (mm) of the battery casing, and W LiPF6 The amount of LiPF6 relative to the total weight of the electrolyte, expressed as a percentage (%), W EC It is the amount of ethylene carbonate relative to the total weight of the electrolyte, expressed as a percentage (%), and W EL This represents the total weight (g) of the electrolyte contained in the lithium secondary battery. [Mathematical formula (1)]

A secondary battery includes a positive electrode for a secondary battery, a negative electrode, and an electrolytic solution. The positive electrode for a secondary battery includes a positive electrode active material for a secondary battery. The positive electrode active material for a secondary battery includes first particles and second particles. The first particles have a median diameter D50 of greater than or equal to 15 micrometers and less than or equal to 30 micrometers and each include a lithium-containing compound. The second particles have a median diameter D50 of greater than or equal to 1 micrometer and less than or equal to 10 micrometers and each include a center part that includes a lithium-containing compound and a covering part provided on a surface of the center part. The covering part includes, in order from a side closer to the center part, an underlayer and a surface layer. The underlayer includes a reaction product of a first metal alkoxide in which no alkyl group is bonded to a metal atom. The surface layer includes a reaction product of a second metal alkoxide in which the alkyl group is bonded to the metal atom. The reaction product of the second metal alkoxide is bonded to the reaction product of the first metal alkoxide.

This invention provides a method for manufacturing a sheet for an all-solid-state secondary battery, a method for manufacturing an all-solid-state secondary battery manufactured by the method, and the sheet for an all-solid-state secondary battery and the all-solid-state secondary battery. In the method for manufacturing the sheet for the all-solid-state secondary battery, an inorganic solid electrolyte composition containing an inorganic solid electrolyte and a dispersion medium is coated onto a substrate to form a film. Either or both of the preparation temperature of the inorganic solid electrolyte composition and the temperature before coating are set to 35-90°C.

In one embodiment of the present invention, the porous carbon particles used in the positive electrode of an air battery for forming a porous carbon film satisfy all of the following a) to g): a) The full width at half maximum (FWHM) of the D band peak in the Raman spectrum is 30 cm. ‑1 Above and 60cm ‑1 Below; b) The full width at half maximum (FWHM) of the G-band peak in the Raman spectrum is 32 cm. ‑1 Above and 80cm ‑1 The following are examples: c) The ratio of the intensity of the D band peak to the intensity of the G band peak in the Raman spectrum, i.e., an R value of 0.8 or higher; d) The surface spacing of the (002) plane of carbon based on X-ray diffraction (XRD) is d 002 e) The portion with a diameter greater than 0.336 nm and less than 0.355 nm; e) The volume of pores with a diameter greater than 1 nm and less than 1000 nm, determined by the BJH method from the adsorption isotherm obtained by nitrogen adsorption, is 1.5 cm³. 3 / g or more and 10.0cm 3 / g or less; f) The volume of pores with a diameter of 1 nm or more and less than 100 nm, determined by the BJH method from the adsorption isotherm obtained by nitrogen adsorption, is 1.0 cm³. 3 / g or more and 8.0cm 3 / g or less; g) The specific surface area obtained by the BET method from the adsorption isotherm obtained by nitrogen adsorption is 500 cm². 2 / g or more and 2000cm 2 / g or less.

The present invention provides a pre-dispersant composition including a hydrogenated nitrile-butadiene rubber and an amide -based dispersion medium, wherein viscosity (Brookfield viscometer, 25°C) is in a range of 70 cPs to 3,000 cPs, and a moisture content is 0.9 wt% or less, an electrode slurry composition including the same, and an electrode for a secondary battery and a secondary battery which are prepared by using the electrode slurry composition.

The present application provides an electrolyte capable of improving the high-temperature storage characteristics and cycle characteristics of an electrochemical device. The electrolyte contains at least one compound represented by General Formula (1-1) (in the formula, R 101 is an alkyl group having 1 to 7 carbon atoms which can be fluorinated, etc., and can also contain O, etc. in the structure) and General Formula (1-2) (in the formula, R 102 and R 103 (i) are independently H, F, an alkyl group having 1 to 7 carbon atoms which can be fluorinated, etc., or (ii) are a hydrocarbon group which is linked to each other to form a 5- or 6-membered heterocycle together with the nitrogen atom, and can also contain O, etc. in the structure).

The present invention aims at providing a positive electrode in which life characteristics are excellent while high capacity is achieved by using a positive electrode additive of ZrO2-x(0<x<2) to complement structural stability of a high-nickel positive electrode active material, a method of preparing the same, and a lithium secondary battery including the positive electrode.

This negative electrode for a rechargeable battery, according to an exemplary embodiment, comprises: a core; and a mixture layer formed on the core. The mixture layer includes: a first mixture layer; and a second mixture layer disposed on the first mixture layer. The first mixture layer and the second mixture layer have mutually different pore size distributions. In a case where a pore size corresponding to the maximum peak of the pore size distribution of the first mixture layer is defined as pore size A and a pore size corresponding to the maximum peak of the pore size distribution of the second mixture layer is defined as pore size B, the ratio of pore size A to pore size B (A / B) is greater than 0.01 and less than 1.

The present application aims to provide a slurry composition for a full solid secondary battery, which can form a solid electrolyte-containing layer that can allow a full solid secondary battery to exhibit excellent output characteristics and cycle characteristics. The slurry composition of the present application contains a solid electrolyte, a particulate polymer, and an organic solvent. The particulate polymer has a core-shell structure having a core portion and a shell portion covering at least a part of the outer surface of the core portion, the glass transition temperature of the polymer constituting the core portion is -60°C or higher and -10°C or lower, and the glass transition temperature of the polymer constituting the shell portion is 15°C or higher and 100°C or lower. Furthermore, the polymer constituting the shell portion contains a nitrogen-containing functional group monomer unit at a proportion of 10% by mass or more and 90% by mass or less.

A lithium secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode is an electrode in which lithium metal is deposited by charging and dissolved in the nonaqueous electrolyte by discharging. The nonaqueous electrolyte contains an oxygen-containing acid compound containing an O-X bond and a fluorine-containing ether. Element X is at least one selected from the group consisting of elements capable of forming an alloy with lithium, N, and S.

A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material, and the positive electrode active material includes a lithium-transition metal composite oxide containing Ni, Mn, and Al. The proportions of Ni, Mn, and Al in metal elements other than Li contained in the lithium-transition metal composite oxide are, respectively, Ni: 50 atm% or more, Mn: 10 atm% or less, and Al: 10 atm% or less. When the lithium-transition metal composite oxide contains Co, the proportion of Co in the metal elements other than Li is 1.5 atm% or less. The nonaqueous electrolyte contains an oxalate compound, and the oxalate compound contains a lithium cation and an oxalate complex anion.

One embodiment of the present application is a composite particle containing silicon and carbon, having the following features. The cross-sectional diameter and the silicon content of the composite particle are measured by cross-sectional SEM-EDS, and when composite particles having a cross-sectional diameter of less than 1 / 2 of the number average of the cross-sectional diameters are referred to as small-diameter composite particles, the ratio of the number of the small-diameter composite particles to the number of the measured composite particles is 5% or more and 50% or less, the ratio of the average silicon content (mass%) of the particles other than the small-diameter composite particles to the average silicon content (mass%) of the small-diameter composite particles is 0.90 or less, and the silicon content of the entire composite particle is 45 mass% or more.

This invention relates to the field of electrode materials technology, specifically to a method for preparing a manganese-rich precursor for cathode materials. The invention first synthesizes a manganese-nickel bimetallic organic framework using nickel acetate tetrahydrate and manganese acetate tetrahydrate as metal sources and 3,3',5,5'-biphenyltetracarboxylic acid and 2-aminoterephthalic acid as ligands. Then, through the action of a main complexing agent and a co-complexing agent, manganese acetate tetrahydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate, and lithium acetate tetrahydrate are deposited on the surface of the manganese-nickel bimetallic organic framework to obtain the manganese-rich precursor for cathode materials. Lithium-ion batteries prepared using this manganese-rich precursor exhibit high coulombic efficiency, excellent cycle stability, and rate performance.

A negative electrode active material composite particle according to one embodiment is a composite particle for a negative electrode active material, the composite particle including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and a resin-calcined material. The resin-calcined material containing at least one element selected from F and N. The composite particle has a porosity of 10% or less, for example, and the content of the resin-calcined material is 1-20% by mass with respect to the mass of the composite particle.

A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material, the positive electrode active material includes a lithium-transition metal composite oxide containing Ni, Mn, and Al, and the proportions of Ni, Mn, and Al in metal elements other than Li contained in the lithium-transition metal composite oxide are, respectively, Ni: 50 atm% or more, Mn: 10 atm% or less, and Al: 10 atm% or less. When the lithium-transition metal composite oxide contains Co, the proportion of Co in the metal elements other than Li is 1.5 atm% or less. The nonaqueous electrolyte includes an organophosphorus compound represented by a general formula (1). In the general formula (1), R1 and R2 are each independently an alkyl group with 1 to 4 carbon atoms, and R3 is a fluorinated alkyl group with 1 to 4 carbon atoms.

Provided is a method for manufacturing a separator for an electricity storage device, the method comprising a step for forming a molded body by extruding powdered polyethylene, granular polypropylene, and a plasticizer in the form of a sheet by means of an extruder, and a step for making the molded body porous by means of a wet process.

The present invention relates to a method for activating a lithium secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, in which the lithium secondary battery comprises a positive electrode active material made of a lithium metal oxide containing manganese in an amount of 50 mol% or more but less than 100 mol% based on the total metal content excluding lithium, the method includes activating the lithium secondary battery by a CC-CV charging method in which constant current (CC) charging is performed until a specified state of charge (% SOC) is reached, and then constant voltage (CV) charging is performed, in which the CC-CV charging of the activation step ends at a point in time at which an activation charging depth defined by the following mathematical formula 1 becomes 5.17% to 15.00%, [Mathematical formula 1] Depth of charge for activation (%) = (charge capacity for CV charge interval / total charge capacity for activation step) * 100.

This invention relates to a positive electrode for a secondary battery, comprising: a positive electrode active material layer, which further comprises a positive electrode active material, a conductive material, a binder, and a positive electrode additive. The positive electrode additive contains substituents having a cyclic sulfonate (sulfonolactone) or cyclic sulfate structure, thereby inhibiting oxygen release from the positive electrode active material, which improves the structural stability of the positive electrode active material.

This invention provides a secondary battery assembly that exhibits excellent cycle characteristics when used in a secondary battery. The secondary battery assembly comprises a metal complex represented by formula (1): where M is an n-valent metal, m is an integer of 0 or greater and (n-1) or less, Q is a ligand selected from: unsubstituted or substituted 8-hydroxyquinoline salts, unsubstituted or substituted 2-(2-pyridyl)phenol salts, and unsubstituted or substituted 2-(2',2''-bipyridin-6'-yl)phenol salts; and L is a ligand selected from phenol salts and naphthol salts.

A battery includes a first electrode, a second electrode, and a solid electrolyte layer disposed between the first electrode and the second electrode, the first electrode includes a current collector and an active material layer disposed between the current collector and the solid electrolyte layer, the active material layer contains BiNi, and the BiNi has a crystal structure of space group C2 / m.

The invention discloses a zinc-based flow battery electrolyte and application thereof, and belongs to the technical field of electrochemical energy storage. The electrolyte is an aqueous solution containing a zinc salt and an additive, and the additive comprises a calcium salt and a magnesium salt; the additive also comprises one or more of lithium salt, sodium salt and strontium salt. Wherein Ca < 2 + > and Mg < 2 + > can strongly interact with water molecules, and a hydrogen bond network in the electrolyte is effectively weakened, so that the freezing point is remarkably reduced; and a small amount of other added metal cations generate a synergistic effect with Ca < 2 + > and Mg < 2 + >, so that the electrolyte still keeps excellent electrochemical properties such as high ionic conductivity and the like while obtaining an ultra-low freezing point. On the basis, the electrolyte successfully realizes stable circulation of the zinc-iodine flow battery in an extremely low-temperature environment. The electrolyte is low in cost, safe and environment-friendly, and a reliable technical scheme is provided for widening the application scene of the zinc-based flow battery to the extreme low-temperature field.

This invention provides an adhesive composition for energy storage devices. The electrode slurry has excellent defoaming and adhesion properties, and can produce energy storage device electrodes that suppress electrode expansion during repeated charging and discharging, thereby improving the cycle life characteristics of energy storage devices. The adhesive composition for storage devices of the present invention contains a polymer (A) and a liquid medium (B). When the total number of repeating units contained in the polymer (A) is set to 100% by mass, the polymer (A) contains 1 to 40% by mass of repeating units (a1) from unsaturated carboxylic acids and 5 to 40% by mass of repeating units (a2) from α,β-unsaturated nitrile compounds, and satisfies the following conditions: <Condition> 0.30g of the polymer (A) is taken as solids and placed in a petri dish with a diameter of 5cm. It is dried in a constant temperature bath at 130°C for 30 minutes. 0.30g of the resulting film is cut into 5mm wide pieces. All the slices of the resulting film are immersed in 30mL of a 0.01M sodium hydroxide aqueous solution at pH 12 and stirred in a warm water bath at 65°C for 2 hours. After stirring, the components dissolved to the aqueous layer are separated and dried. The content of nitrogen element in the dried solid is set as N. B Let the content of nitrogen element in the polymer (A) be defined as N. A When, its proportion (N) B / N A The value is below 0.10.

Battery (1000) according to the present disclosure includes first electrode (101), second electrode (103), and electrolyte solution (102). First electrode (101) includes a base material that is a porous body and an active material layer located on a surface of the base material. The active material layer contains an alloy containing Bi and Ni. The active material layer may contain an alloy containing Bi and Ni as a main component of the active material. In battery (1000), for example, first electrode (101) may be a negative electrode, and second electrode (103) may be a positive electrode.

The present invention relates to a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. The present invention addresses the problem of providing a positive electrode for a lithium ion secondary battery having excellent adhesion to a current collector and suppressed cracks, and a lithium ion secondary battery having excellent cycle characteristics. A positive electrode for a lithium ion secondary battery, which contains a current collector, a coating layer that contains a conductive material and a non-aqueous binder, and an active material layer, and wherein the non-aqueous binder contains a conjugated diene copolymer having a specific element, and the amount of the conjugated diene copolymer is 100 parts by mass per 100 parts by mass of the coating layer. The content of the conductive material is from 40.0 parts by mass to 99.9 parts by mass (inclusive) with respect to 100 parts by mass of the coating layer, and the content of the non-aqueous binder is from 0.1 parts by mass to 60.0 parts by mass (inclusive) with respect to 100 parts by mass of the coating layer.

The present invention relates to a separator, a method of preparing the same, and a secondary battery including the same, the separator including a porous substrate, a ceramic coating layer disposed on at least one surface of each surface of the porous substrate, and a positively charged self-assembled monolayer disposed on the ceramic coating layer.

Provided is an electrolyte solution capable of providing a lithium-sulfur secondary battery that has excellent cycle characteristics and that is less likely to generate gas. The electrolyte solution is intended to be used in a lithium-sulfur secondary battery that includes: a positive electrode containing a sulfur-containing electrode active material that includes at least one selected from the group consisting of simple sulfur, lithium polysulfide (Li2Sn: 1 < n < 8), an organic sulfur compound, and an inorganic sulfur compound; and a negative electrode containing a material that occludes and releases a lithium ion. The electrolyte solution contains a non-aqueous electrolyte and a solvent. The solvent contains an acyclic diether having a Σ{σ × P(σ)} value, where σ ≥ 0.01 (e / Å2), falling within a range indicated by the following formula (1) : 0<∑σ×Pσ<0.24 wherein σ represents a screening charge density and P(σ) represents an σ-profile.