191results about How to "Low self-discharge rate" patented technology

Disclosed is an electrochemical cell comprising a lithium anode and a sulfur-containing cathode and a non-aqueous electrolyte. The cell exhibits high utilization of the electroactive sulfur-containing material of the cathode and a high charge-discharge efficiency.

The invention provides an off-grid and grid-connected operation light and storage joint power supply system which comprises a DC/AC converter for connecting a direct current bus and an alternating current bus. The alternating current bus is connected with a power grid. The alternating current bus and the direct current bus are connected with an alternating current load and a direct current load respectively. The direct current bus is connected with a photovoltaic array and a battery system through a photovoltaic DC/DC converter and an energy storage DC/DC converter respectively. According to the off-grid and grid-connected operation light and storage joint power supply system, control strategies of the off-grid and grid-connected operation light and storage joint power supply system are provided and include the off-grid state operation control strategy and the grid-connected state operation control strategy. By means of the system and a method, the defects that an existing photovoltaic power supply system is instable in power supply quality, poor in schedulability, single in operation mode, low in energy conversion efficiency and the like are overcome.

The invention provides a lithium ion battery positive plate made from a ternary material and a method for preparing the same, which relate to a lithium ion battery. The lithium ion battery positive plate made from the ternary material is provided with a current collector, both the right side and the back side of the current collector are coated with a conductive layer respectively, and the conductive layer comprises the following components by mass percentage: 1 to 5 percent of conductive agent, 3 to 5 percent of binder, and the balance of anode active substances. The method comprises the following steps: stirring the binder with an organic solvent until the white binder is dissolved completely to obtain a transparent colloidal binder, standing the transparent colloidal binder, adding the conductive agent into the transparent colloidal binder, and stirring the mixture to obtain conductive gel; adding the anode active substances into the conductive gel, and stirring the mixture to obtain slurry; stirring the slurry, adjusting the viscosity, and sieving the slurry for standby; performing corrosion treatment on the current collector with an alkali liquor first, and then washing and drying the current collector; and coating the sieved slurry on the right side and the back side of the current collector evenly, drying the current collector to finish the coating so as to obtain the lithium ion battery positive plate made from the ternary material.

The invention is a lithium battery anode active matter, and anode dressing and the preparing method thereof. And the anode active matter comprises trinary material LiNixCoyMn1-x-yO2 and lithium cobaltate; the anode dressing comprises anode active matter, graphite conductive agent, charcoal black conductive agent, and adhesive; and the preparing method comprises: 1. ball-milling: a. ball-milling the trinary material, lithium cobaltate and graphite conductive agent in proportion; b. after a, adding the charcoal black conductive agent into ball-mill tank in proportion; and blending: a. taking the adhesive in proportion and blending with organic solvent, and when blending until no bubbles, stilling and serving; b. adding mixed material and other additives to colloid and blending thickly; and c. filtering for coating.

Disclosed herein is a smart wearable lens mounted with an all-solid-state thin film secondary battery including a flexible substrate, a cathode current collector, a cathode, a solid electrolyte, an anode, and an anode current collector. The smart wearable lens mounted with the all-solid-state thin film secondary battery may be stably and continuously supplied with power and has a low self-discharge rate. In addition, the smart wearable lens may minimize aversion when humans are wearing the smart wearable lens and be suitably used for a curved lens, especially a micro-lens such as a contact lens.

The invention relates to a lithium nickel cobalt manganese oxide material precursor and a preparation method thereof and a lithium-ion battery prepared from the precursor. The lithium nickel cobalt manganese oxide material precursor is in a spherical form, primary particles are in the shape of emissive strips and the chemical formula is Ni(1-x-y)Co<x>Mn<y>(OH)<2>, wherein x is smaller than 0.2 and greater than 0 and y is smaller than 0.2 and greater than 0, the tap density is 1.6-1.9g/cm<3>, the median particle size D50 is 6-18 microns and the average pore size is 14-18nm. The preparation method of the lithium nickel cobalt manganese oxide material precursor is improved on the basis of a traditional one-step method, and the precursor prepared through the method has the characteristics of a precursor product under a single anti-oxidation condition and also has the characteristics of a precursor product under a single oxidation condition; and a ternary positive electrode material prepared from the precursor has the advantages of high capacity and high cycle performance, and also has the advantages of high compaction density, good heat stability and low self-discharge rate.

The invention relates to a precursor nickel-cobalt-manganese hydroxide of a ternary material used for lithium batteries and a preparing method thereof. The nickel-cobalt-manganese hydroxide is characterized in that: the general chemical formula of the nickel-cobalt-manganese hydroxide is NixCoyMnz(OH)2, wherein the sum of the x, the y and the z is 1, the x is less than 1 and more than 0, the y is less than 1 and more than 0 and the z is less than 1 and more than 0. The ternary material prepared from the nickel-cobalt-manganese hydroxide is high in compaction density, good in cyclic performance, high in thermal stability and low in self-discharge and has good comprehensive performance. The preparing method introduces a single-kettle batch production mode into a continuous production mode. A product with wide particle size distribution and more small particles is prepared by continuous production. Based on the product of the continuous production, batch production is utilized, the production process is free of generation of new small particles, only original small particles grow to be more compact, other larger particles grow at the same time, and the finished product is still wide in particle size distribution.

The invention relates to a lithium ion battery comprising a shell, an electric core arranged inside the shell and electrolyte, wherein the electric core comprises a positive electrode, a negative electrode, and a membrane for separating the positive electrode from the positive electrode; the positive electrode comprises a positive electrode piece and a positive electrode material layer coated on the surface of the positive electrode piece; the negative electrode comprises a negative electrode piece and a negative electrode material layer coated on the surface of the negative electrode piece; the density of the coating face of the positive electrode material layer is 25-36mg/cm<2>; the density of the coating face of the negative electrode material layer is less than or equal to 36mg/cm<2>; and a ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is (1.2:1)-(1.5:1). The negative electrode comprises the negative electrode piece, a negative electrode inner coating coated on the surface of the negative electrode piece, and a negative electrode outer coating coated on the surface of the negative electrode inner coating. The lithium ion battery has high multiplying power, high working voltage, high energy density, and low self discharge rate. The invention simultaneously provides a preparation method of the lithium ion battery.

The invention provides a soft carbon anode material for a lithium-ion power and energy storage battery as well as a preparation method and application of the soft carbon anode material. According to the preparation method, a low-concentration purifying reagent and a mesophase carbon microsphere precursor are stirred and mixed, so as to enable the low-concentration purifying reagent to react with impurities to generate water-soluble substances, and the water-soluble substances are washed by purified water, so that the impurity content is reduced, the product purity is improved, the carbon content is greater than 99.3%, and the self-discharge rate is obviously reduced; through low-temperature carbonization, and through surface activation modification of a material by a lithium-containing compound and/ or an activating reagent, a dense film similar to an SEI (solid electrolyte interface) component is formed on the surface of the material, which facilitates the reduction of L<i+> consumed in the SEI film forming process during the charging and discharging process of the battery, thereby improving the initial coulombic efficiency and improving the cycle performance; the porosity is increased, lithium intercalating and de-intercalating active sites are increased, the capacity of the material is increased, and thus the energy density of the whole battery is increased.

The invention discloses a novel process for preparing a low-cost battery-grade iron phosphate material by using iron hydroxide. The process comprises the following steps: mixing a zero-valent iron source and corrosive acid in a molar ratio, and adding a certain amount of primary water and ammonia water; stirring to react for 0 to 24 hours, and slowly adding hydrogen peroxide until the iron source disappears and the solution turns to orange; adding surfactant which is 1 to 5 percent that of the mass of the iron source into the solution; adding a reagent containing phosphate radicals into the solution according to a certain molar ratio of iron element to phosphor element under a stirring condition to obtain iron phosphate precipitate; filtering and washing the product 3 to 5 times with the primary water which is 3 to 7 times the weight of the iron phosphate; drying in vacuum for 4 to 12 hours at 50 and 80 DEG C to obtain FePO4.2H2O. The process for preparing battery grade iron phosphate is simple and easy to carry out and low in cost; and the prepared product has good product crystal structure, few impurities and uniform granularity and is suitable for industrial scale production; moreover, the lithium iron phosphate prepared by the process has high specific capacity, low self-discharge, high tap density, stable product performance and good processing performance.

The invention discloses a high-performance lithium ion secondary battery. The active substance of the anode of the battery is lithium-containing compound oxide of the chemical formula: LiFe(1-y)MyPO4, wherein M is one element selected from Co, Ni, Mn, Al, S, Ca, K, Na, Mo and Cr, y is more than 0 but less than or equal to 0.75. A water-soluble polymer is used as an adhesive. The anode of the inventive lithium ion secondary battery is prepared by mixing LiFe(1-y)MyPO4 compound with the water-soluble polymer at a given weight ratio, adding a conductive substrate and water as an solvent, mixing, stirring and filtering to obtain a homogenous slurry, coating the flurry on the surface of an aluminum foil, drying at 55-150 DEG C to obtain an anode piece, winding together with a cathode piece, assembling, infusing, standing, pre-charging with a 0.01C-0.65C current, standing again, and fractioning volumes. The inventive high-performance lithium ion secondary battery has the advantages of good property of high-current charge and discharge, long cycle life, high safety, environmental friendliness, and low cost.

The invention discloses an electrolyte used for an ion state mixed crystal salt storage battery. The electrolyte comprises the following components in percentage by weight: 52-80% of hydrosulphate, 0.1-8% of corrosion inhibitor, 0.4-3% of antiager, 3-12% of strong acid salt agent, 0.1-10% of ester ion concentration control agent, 1-13% of lead-acid storage battery activating agent, 1-10% of chemically pure sulfuric acid of which the concentration is larger than or equal to 98%, and the balance of distilled water. The electrolyte disclosed by the invention has the advantages that the environment pollution caused by sulfuric acid in the electrolyte of the existing lead-acid storage battery is effectively avoided, a system is enabled to have stable and mild reactivity, the stable electrochemical performance of the storage battery is improved, the high and low ambient temperature adaptability is strong, the effective discharge capacity and the self discharge rate are small, and the service life of the battery can be effectively prolonged.

The diaphragm is a hot melted and rolled product from non-woven fabrics of nylon backing material in one, two or three layers. In total weight of raw fiber, nylon fiber is in 40-60 wt%, and hot melted composite fiber with dual constituents in low melting point is in 40-60 wt%; or, nylon fiber is in 40-60 wt%, hot melted composite fiber with dual constituents in low melting point is in 30-45 wt%, superfine vinylon fiber is in 10-15 wt%. The method includes steps: using different techniques prepares non-woven fabrics of nylon backing material in different structures; using hot rolling machine with three rollers rolls non-woven fabrics of nylon backing material in one, two or three layers. Features are: simple method, small investment easy of obtaining materials and low cost. The diaphragm is accorded with requirements of nickel cadmium SC cell: high capacitance 1500man-2000man, and discharging in 10C-15C high multiplying factors.

The invention discloses a preparation method for a lithium ion battery negative pole slurry. The preparation method comprises the following steps: adding solid raw materials comprising, by mass, 90 to 95% of powdered carbon, 1 to 3% of a conductive agent, 1 to 4% of a binder LA133 and 1 to 3% of SBR into deionized water in an environment with a temperature of 15 to 35 DEG C, wherein a mass ratio of the solid raw materials to the deionized water is 1:1; carrying out vacuum-pumping and then stirring in a stirrer for 5.1 to 9.4 h so as to obtain a mixture A; and adding NMP accounting for 0.5 to 1% of the mass of the mixture A 1 to 2 h before discharging of the mixture A and carrying out filtration so as to obtain the negative pole slurry. According to the invention, since a CMC glue solution does not need to be prepared in advance, preparation time for the slurry is shortened, the problem of dusting of a negative pole piece is overcome, and thus, self-discharge of a battery is mitigated, and influence on the service life of the battery resulting from introduction of sodions by CMC is avoided.

The embodiment of the invention discloses a lithium battery which comprises a shell, wherein both ends of the shell are open to form two opening ends; one opening end is connected and matched with an anode cover board; the other opening end is connected and matched with a cathode cover board; a battery pole rod body is coated in the shell; the winding initial position of the battery pole rod body is connected with a middle bracket tube; the middle bracket tube runs through the battery pole rod body; the anode of the battery pole rod body is connected with the anode cover board through one end of the middle bracket tube to form an anode end of the lithium battery; and the cathode of the battery pole rod body is connected with the cathode cover board through the other end of the middle bracket tube to form a cathode end of the lithium battery. The embodiment of the invention also discloses an assembling method of the lithium battery. The lithium battery is in a stud structure and has a low self-discharge rate, strong current conveyance capacity and high battery comprehensive performance. Moreover, the lithium battery has a simple assembling process, a simple manufacturing process and a low cost.

The invention discloses a low-impedance interface processing method of a solid-state lithium battery positive electrode and a positive electrode structure. By the method, impedance of two interfaces between active material particle in a positive electrode plate and solid-state electrolyte particle and between the positive electrode plate and an electrolyte piece can be effectively reduced, so thatthe capacity of active positive electrode particle in the solid-state lithium battery can be effectively developed. The dual-layer structure ceramic piece comprising a solid-state electrolyte layer and a positive electrode layer and fabricated by the method is excellent in performance and has favorable application prospect in the field of solid-state lithium batteries.

The invention discloses an anode active matter, which comprises a nickel hydroxide particle (1) and an oxide of cobalt and/or hydroxid packing layer (2) which is coated on the surface of the nickel hydroxide particle, wherein, the anode active matter is covered with a second packing layer (3) on the surface of the oxide of cobalt and/or hydroxid packing layer (2). The second packing layer (3) is the oxide of metal and/or hydroxid which is selected from one or more from magnesium, barium, zinc, calcium, titanium, aluminum, tantalum, manganese, yttrium, chromium, cadmium, strontium and oxide of lanthanides lanthanon and/or hydroxid. The anode active matter of the invention is covered with the second packing layer on the surface of oxide of cobalt and/or hydroxid packing layer for protecting the oxide of cobalt and/or hydroxid from reducing by hydrogen generated by hydrogen separating reaction. At the same time, the oxygen separation overpotential is improved, thereby greatly reducing self discharging rate of battery and improving circulation performance and charging and discharging efficiency.

The invention provides an integrated structure of an ultrathin lithium-manganese battery. The integrated structure comprises a positive structure, a negative structure and a diaphragm structure, wherein in the positive structure, an aluminum net is coated by manganese dioxide, a conductive agent and a binding agent; in the negative structure, an ultrathin lithium strip is compounded with a punched copper film; in the diaphragm structure, two sides of a diaphragm are coated with adhesives with stable electrochemical properties; a positive plate and a negative plate and the diaphragm are adhered together to form an integrated structure; a nickel/copper-plated nickel positive lug, a nickel/copper-plated nickel negative lug and the integrated structure are packaged. By fully utilizing the limited volume, the maximum energy is obtained; the integrated structure is reasonable in design and simple to make; automatic production is easily realized; the integrated structure is suitable for preparing the ultrathin lithium-manganese battery with a thickness of less than 0.45mm. The ultrathin lithium-manganese battery prepared by adopting the structure has high energy density, and good flexibility and stability; when bent and deformed, the battery can not cause electrode dislocation to lead micro short circuit.