61 results about "Lithium-ion battery" patented technology

Positive electrode active materials are described that have a very high specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. Some materials of interest have the formula Li_1+xNi_αMn_βCO_γO₂, where x ranges from about 0.05 to about 0.25, α ranges from about 0.1 to about 0.4, β ranges from about 0.4 to about 0.65, and γ ranges from about 0.05 to about 0.3. The materials can be coated with a metal fluoride to improve the performance of the materials especially upon cycling. Also, the coated materials can exhibit a very significant decrease in the irreversible capacity lose upon the first charge and discharge of the cell. Methods for producing these materials include, for example, a co-precipitation approach involving metal hydroxides and sol-gel approaches.

The invention relates to a capacitor of a lithium ion battery. The capacitor comprises a capacitor shell, an organic electrolyte arranged in the capacitor shell, a winding core formed by isolating a positive plate from a negative plate through an ion permeability microporous membrane and winding, wherein the positive plate and the negative plate are respectively connected with a positive lug and a negative lug and are led out by the positive lug and the negative lug to a positive end and a negative end of the capacitor shell. A negative active material comprises a material A and a material B, wherein the material A comprises at least one of hard carbon and soft carbon, the material B comprises at least one of natural graphite, modified graphite and synthetic graphite, the material A accounts for 50.0%-95.0% of the capacity percentage of the negative active material, and the material B accounts for 5.0%-50.0% of the capacity percentage of the negative active material. The capacitor has the high-energy density characteristic of the lithium ion battery and the high-power density characteristic of a double electric layer capacitor.

The invention relates to a surface coating modified lithium ion battery cathode material and a preparation method thereof. The surface coating modified lithium ion battery cathode material has a general chemical formula of LiNi<1-a-b>CoaAlbO2/M, wherein a is more than 0.1 and less than 0.3, b is more than 0.01 and less than 0.2, and M refers to a coating layer. The material is coated by adopting a dry method; the coating layer refers to one or a mixture of two of lithium iron phosphate and lithium ferric manganese phosphate; and the mass ratio of the coating layer to LiNi<1-a-b>CoaAlbO2 is (0.01-0.2):1. The surface coating modified lithium ion battery cathode material and the preparation method thereof disclosed by the invention have the advantages that the stability of the cathode material is improved, and the safety performance of the material is improved; and moreover, in the dry-method coating process, waste liquor is not produced, high-temperature sintering is not needed, and the energy consumption and cost can be reduced.

The invention discloses an alumina coating method of a lithium ion battery positive electrode material. The method comprises the following steps: adding ammonia water to a positive electrode material suspended aluminum nitrate solution in a dropwise manner to form a precipitate coated by Al(OH)3, and heating the precipitate in an air atmosphere muffle furnace to form an alumina coated positive electrode material. The coating method can improve the charge and discharge capacity of the lithium ion battery and prolong the cycle life.

The present invention relates to a method for winding coil core of lithium ion battery which comprises of steps of: unreeling the first membrane and the second membrane by unwinders of their own respectively at the same time, sending two source of two membranes connected between upper briquetting and lower briquetting of unwinder to be clamped, puncturing coiling needle, and inserting two electrode slices, driving upper briquetting and lower briquetting closed to clamp the next first membrane and the second membrane making the clamped parts of two membranes are connected, starting membrane cutter to cut the two membranes, pressing and binding the coiled coiling core rudiment, the winding coil core of lithium ion battery is obtained. Comparing to the present technique, the present invention can reduce cost of winding coil core of lithium ion battery, and at the same time, is suitable for semi-automatic and full-automatic unwinder and improves the production efficiency.

The invention relates to an electrolyte for a ternary cathode material lithium ion battery. The electrolyte comprises a lithium salt, organic solvent and an additive, wherein the lithium salt is an imidodisulfuryl fluoride lithium salt of which the concentration is greater than 1 mol/L; the organic solvent comprises cyanogen carboxylate and other non-water organic solvent; the addition mass of the cyanogen carboxylate is 5-35% of the total mass of the organic solvent; the cyanogen carboxylate is a combination of one or more selected from the following structural formulae in the specification; and at least one of R1 and R2 is a cyanogen radical or a cyanogen radical containing group. By using the electrolyte provided by the invention, the cycle performance of the ternary cathode material lithium ion battery at normal temperature can be stabilized, the aging and swelling phenomena of the ternary cathode material lithium ion battery under high-temperature conditions can be inhibited, and the internal resistance of the ternary cathode material lithium ion battery is reduced.

The invention discloses method for improving the low-temperature performance of a lithium iron phosphate anodic material for lithium batteries and lithium batteries. The method is to add lithium cobaltate into the formula of the lithium iron phosphate anodic material for lithium batteries. In the invention, based on the characteristic that the low-temperature discharging performance of the lithium cobaltate is high, the problem of low-temperature performance of the conventional lithium iron phosphate batteries is solved, the conventional production process is not changed, and the lithium iron phosphate batteries with high low-temperature performance are manufactured. In the invention, by optimizing and screening the added amount of lithium cobaltate, the low-temperature discharging volume retention rate is increased, the discharging time is prolonged, and better effect is obtained.

The invention discloses a composite phosphate type anode material for a lithium ion battery, and a preparation method thereof. The composite phosphate type anode material can cause the raw material containing metals, lithium and phosphorus source and/or superfine LiMPO4 and/or superfine Li5-yM'2(PO4)3 to react under inert or reducing atmosphere and high temperature to synthesize LiMPO4 and Li5-yM'2(PO4)3 composite phosphate with combined chemical bonds, and by adding a conductive agent ball grinder, the composite anode material with excellent electrochemical performance can be obtained. The composite anode material prepared by the method has the advantages of low cost, unique process method and good electrochemical performance; the industrialization is easy to achieve.

The invention discloses a modified lithium-rich manganese-based cathode material for a lithium ion battery. The structural general formula of the material is (La<1-x>Sr<x>)MnO<3-delta>, wherein x is equal to or greater than 0 and less than or equal to 0.3, a is equal to or greater than 0.8 and less than or equal to 1, and delta is equal to or greater than 0 and less than or equal to 0.75; the modified lithium-rich manganese-based cathode material is prepared through the method 1 or method 2 as follows: method 1: lanthanum salt, strontium salt and manganese salt are mixed according to the stoichiometric proportion to prepare a (La<1-x>Sr<x>)MnO<3-delta> precursor solution, then a complexing agent is added into the solution and stirred uniformly, the lithium-rich manganese-based cathode material is added into the solution, heating is performed to evaporate the solution to form gel, and finally the dried gel is calcined, so that the modified cathode material is obtained; method 2: a precursor solution is prepared according to the method 1, a complexing agent is added into the solution and stirred uniformly, then the mixed solution is heated until the solution is burnt into powder, the powder is pre-burnt and is mechanically mixed with the lithium-rich manganese-based cathode material, and the mixture is calcined, so that the modified cathode material is obtained.

The invention relates to a device and method for detecting an environmental parameter in a lithium ion battery explosion process. The device comprises a sealed observation device provided with an oxygen-free environment therein and an observation window; a clamping device for fixing a lithium ion battery, disposed in the sealed observation device and detachably connected with the sealed observation device; an electric signal input device disposed outside the sealed observation device and connected with the positive and negative poles of the lithium ion battery via wires; a data acquisition device disposed in the sealed observation device and fixedly connected with the sealed observation device; a data output device disposed outside the sealed observation device and connected with the data acquisition device via a wire. The device and method provide a safe detection environment for the explosion tests of the lithium ion battery, separate testing equipment from testing environment, and guarantee accurate environmental parameter acquisition in the lithium ion battery explosion process.

The invention provides a manufacturing method of a winding type lithium ion battery and the winding type lithium ion battery, and relates to the technical field of lithium ion batteries. The method comprises the following steps: punching a foil on one side of a positive pole piece and a foil on one side of a negative pole piece to be saw-toothed to form a saw-toothed positive pole piece and a saw-toothed negative pole piece; arranging an isolating film between the saw-toothed positive pole piece and the saw-toothed negative pole piece in a laminating mode for winding to form multiple layers of positive tabs and multiple layers of negative tabs. The battery comprises an outer composite aluminum plastic film and a multi-tab lithium ion cell, wherein the multi-tab lithium ion cell comprises the positive pole piece, the isolating film and the negative pole piece which are laminated and then wound; one side of the positive pole piece and one side of the negative pole piece adopt saw-toothed structures, and the positive pole piece and the negative pole piece are wound to form the multiple layers of positive tabs and the multiple layers of negative tabs. The production efficiency of a Z-shaped lamination battery is improved, the potential safety hazard of a Z-shaped lamination process in assembly is reduced, the internal resistance of the battery is reduced, and large current discharge is achieved.

The invention belongs to the technical field of new energy materials, in particular to an all-solid-state lithium ion battery and an integrated composite sintering preparation process thereof. The all-solid-state lithium ion battery comprises at least one electrode-electrolyte composite electrode sheet. The electrode of the electrode-electrolyte composite electrode sheet is made of lithium oxide positive electrode or oxide negative electrode material, and the electrode is a solid oxide electrolyte. The interface problem of the all-solid-state lithium battery can be effectively improved and theinterface bonding degree and the interface structure stability between the electrode and the solid electrolyte can be remarkably enhanced so that the single cell has higher density and energy densityand also has very excellent safety performance and is suitable for large-scale production and application.

The invention discloses a flexible lithium-ion battery capable of working around the clock and a preparation method thereof. According to the battery, a membrane assembled by a stretched carbon nanotube macroscopic tube continuous body is taken as a current collector for positive and negative electrodes; and the membrane is subjected to porous treatment and electrolyte infiltration treatment in the membrane-forming process and an electrolyte can be stored into a carbon nanotube membrane as the current collector, so that the obtained battery still can normally work in harsh environments, such as extremely high temperature, extremely low temperature, vacuum and water. A battery main body comprises a positive electrode plate, a membrane and a negative electrode plate which are sequentially stacked. The invention further provides a preparation method of the battery. According to the flexible lithium-ion battery, the problem of a failure of an existing lithium-ion battery due to the fact that the current collector cannot store the electrolyte in the harsh environments can be effectively solved; the preparation process is in full integration with a production technology of an existing mainstream lithium-ion battery; mass production under existing production conditions is facilitated; and the flexible lithium-ion battery has very high practicability.

The invention provides a system for continuously recycling a waste ternary lithium-ion battery and belongs to the technical field of recycling of lithium-ion batteries. The system comprises a pre-treatment unit, an acid leaching unit, a primary impurity removal unit, a co-precipitation unit, a secondary impurity removal unit and an ammonia recycling unit, wherein the pre-treatment unit comprises apulverizer, a pulse dust collection device, a positive and negative electrode powder cabin and a separation machine; the acid leaching unit comprises a leaching reaction kettle and a micro-filteringmachine I; the primary impurity removal unit comprises an impurity removal reaction kettle and a squeezing machine; the co-precipitation unit comprises a material preparation kettle, a co-precipitation reaction tank and a centrifugal machine; the secondary impurity removal unit comprises a secondary impurity removal reaction kettle and a micro-filtering machine II; the ammonia recycling unit comprises a heater, an evaporation crystallization device, a condenser and an ammonia liquid receiving tank. The invention further provides a technology for continuously recycling the waste ternary lithium-ion battery by utilizing the system. According to the system provided by the invention, a prepared nickel-cobalt-manganese ternary material precursor has high purity and large tap density; grains have a small grain diameter and narrow distribution and are uniformly mixed; a lithium sulfate solution can be directly used for producing lithium carbonate.

The invention relates to a layered lithium-rich manganese oxide positive electrode material suppressing capacity/voltage attenuation during a circulation process effectively and a preparation method therefor and an application thereof. The preparation method of the layered lithium-rich manganese oxide positive electrode material comprises the following steps of: during a preparation process of a precursor of the layered lithium-rich manganese oxide positive electrode material of a lithium ion battery, adding the raw material precursor of LiNiO2; and performing high temperature heat treatment to obtain a layered lithium-rich manganese oxide composite positive electrode material. The Ni element in the layered lithium-rich manganese oxide positive electrode material can effectively suppress the migration of transitional metal elements during the circulation of the layered lithium-rich manganese positive electrode material and suppress the formation of a spinel phase, thereby effectively suppressing the capacity/voltage attenuation during the circulation process. The positive electrode and the lithium ion battery that use the material belong to the technical field of energy materials and energy conversion. The material used as the positive electrode material of the lithium ion battery has the advantages of high energy density, cycling stability, and good rate capability.

A method of producing a powder mass for a lithium battery, the method comprising: (a) mixing graphene sheets and an elastomer or its precursor in a liquid medium or solvent to form a suspension; (b) dispersing a plurality of particles of an anode active material in the suspension to form a slurry; and (c) dispensing the slurry and removing the solvent and/or polymerizing/curing the precursor to form the powder mass, wherein the powder mass comprises multiple particulates of the anode active material, wherein at least one of the particulates is composed of one or a plurality of the particles encapsulated by a thin layer of graphene/elastomer composite having a thickness from 1 nm to 10 μm, a lithium ion conductivity from 10⁻⁷ S/cm to 10⁻² S/cm and an electrical conductivity from 10⁻⁷ S/cm to 100 S/cm.

The invention discloses a rapid baking method for a square lithium ion battery, which comprises the following steps of 1, in a preparation stage, vacuumizing a vacuum drying oven in which the square battery is placed to P0 for the vacuumizing time of t0, and then filling nitrogen to normal pressure, 2, in a preheating stage, preheating and drying the vacuum drying oven in which the square battery is placed, 3, in a heat and pressure maintaining stage, maintaining the vacuum degree P2 in the vacuum baking oven for the preheated battery, 4, in a circulation stage, repeating the step 3 for circulation times of X0, 5, in a nitrogen cooling circulation stage, filling nitrogen into the baking device to normal pressure, keeping the normal pressure for t3, and keeping the normal pressure for t4 under the vacuum degree P3, 6, repeating the step 5 for circulation times of X1, and 7, ending the baking. According to the method, air exchange operation is carried out in the vacuum drying oven before baking, the moisture content of gas in the oven body before baking can be removed, what is guaranteed is that the moisture content of the battery baking environment is low, and the performance of the battery is brought into play.

The invention discloses an online self-learning measurement device for an internal resistance of a lithium battery and a measure method thereof. The measurement device comprises a lithium battery body, and further comprises a current sensor for detecting a current signal of the lithium battery body; an electricity sensor for detecting and calculating current electricity of the lithium battery body; a temperature sensor for detecting temperature of the surface of the lithium battery body; a cycle counter for calculating the cycle numbers of the lithium battery body that has been used; a controller for calculating a current internal resistance of the lithium battery body with the current signal parameter, the current electricity parameter, the temperature parameter, the voltage signal parameter and the cycle numbers; a voltage controller for converting a terminal voltage analog signal of the lithium battery body into a digital signal; a correction load for online learning and correctionof the internal resistance measurement device. The online self-learning measurement device for internal resistance of lithium battery can combine offline detection, calibration and online self-learning correction for remaining use time of the lithium battery and has the characteristics of good robustness, high precision and online self-adaptation.

The invention discloses a method for producing a ytterbium-doped lithium nickel cobalt manganese oxide material used for a lithium ion battery. The method comprises the following steps: a) weighing the raw materials according to stoichiometric ratio; b) adding absolute ethyl alcohol in the raw materials, performing ball milling and taking the materials out and drying the materials; c) adding acetate fibre, potassium chloride and sodium chloride in the raw materials obtained in the step 2) for mixing with molten salt and absolute ethyl alcohol, performing ball milling and drying the materials; and d) sintering the raw materials obtained in the step c), cooling the materials, washing the obtained powder, and drying to obtain the material. The ytterbium-doped lithium nickel cobalt manganese oxide material has higher discharge capacity and gram capacity; and has a hollow tube structure, through further processing, the tube wall is loosening so as to alleviate the volume expansion problem; inorganic filling material titanium dioxide in the acetate fibre is used, and is doped into crystal lattice of the ytterbium-doped lithium nickel cobalt manganese oxide material, so that stability of the ytterbium-doped lithium nickel cobalt manganese oxide material is improved, and the capacity attenuation problem of the lithium ion battery is improved.

The invention relates to the field of lithium ion batteries and discloses a safe flexible package lithium ion battery tab. The tab comprises a tab body and a PTC coating applied to the surface of thetab body, wherein the PTC coating is formed by curing PTC slurry, and the PTC slurry comprises a PTC base material, a dispersant, a binder and a solvent; the PTC base material is selected from at least one of BaTiO3 and BaPbO3. The PTC material is applied to positive and negative tabs of a flexible package lithium battery, so that thermal runaway of the battery is effectively controlled, and the safety of the battery is greatly improved.