76results about How to "Guaranteed cycle life" patented technology

The invention belongs to the technical field of lithium-ion secondary batteries, and in particular relates to a first-time charging forming method for a lithium-ion secondary battery. The method comprises the following steps that: carrying out aging treatment on the lithium-ion secondary battery poured with electrolyte, then gradually increasing the charging current to carry out a sectional charge formation on the battery in the state of negative pressure, and sealing the battery when the voltage reaches 3.6 volts; and carrying out aging treatment on the battery, carrying out constant-current charging to 3.8-4.0 volts at a rate of 0.5 C-1 C, then carrying out constant-current charging to 4.2 volts at a rate of 0.2 C-0.5 C, and carrying out constant-voltage charging in the state of 4.2 volts at last. Compared with the prior art, the invention adopts the method of sectional charge formation to charge the battery to 3.6 volts firstly, so as to exhaust the harmful gas produced in the process of forming SEI (solid electrolyte interface), ensure the migration of Li<+> better, enable the formed SEI to be more uniform, stable and compact, and thus improving the cycling performance and high rate discharging performance.

The invention relates to the technical field of lithium ion batteries, in particular to lithium ion battery electrolyte and a lithium ion battery using same; the electrolyte is prepared from lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is prepared from fluoroethylene carbonate, nitrile compounds and a compound with a structure as shown in formula I; R1, R2, R3, R4 and R5 in the formula I are separately selected from hydrogen, an amide group and alkyl or alkoxy with a carbon number being 1-3; R1, R2, R3, R4 and R5 at least contain one amide group. Compared with the prior art, the lithium ion battery electrolyte is excellent in wetting effect and excellent in fast charge performance under a high-voltage condition by virtue of a synergistic effect generated by the fluoroethylene carbonate, the nitrile compounds and an amide pyridine compound with a structure as shown in formula I; moreover, the lithium ion battery electrolyte has the comprehensive performance of a long cycle life and a low high-temperature storage expansion rate.

The invention relates to a colloid lead-acid storage battery cathode lead plaster for an electric power assisted vehicle and a preparation method, aiming to improve the 2hr capacity and the low-temperature capacity at -15 DEG C of a storage battery and prolong the service life. Raw materials of the lead plaster contain the following substances in parts by weight: 100 parts of lead powder, 0.03-0.06 part of fiber, 0.1-0.5 part of acetylene carbon black, 1.0-1.3 part of barium sulfate, 0.1-0.2 part of sodium lignosulphonate, 0.1-0.3 part of humic acid and 0.1-0.3 part of polyethylene glycol. Proved by repeated research trials, the lead plaster integrates the characteristics of strong low-temperature capacity of the sodium lignosulphonate and strong charge receptivity of the humic acid; meanwhile, the use of a colloid electrolyte is considered, and the polyethylene glycol is added to the lead plaster raw materials; through tests, the optimal proportions of all raw material components are determined so as to form a novel cathode mixed organic expanding agent, thereby the 2hr capacity, the low-temperature capacity at -15 DEG C, the cycle life, the charge receptivity and the water retention capacity of the storage battery are guaranteed, and the problem of low-temperature property attenuation of the sodium lignosulphonate is solved.

The invention relates to a water-based high-viscosity glued diaphragm, a preparation method thereof and an application of the diaphragm in a battery. The water-based high-viscosity glued diaphragm comprises a base membrane, and a positive polymer layer and a negative polymer layer which are respectively arranged at two sides of the base membrane, wherein a positive ceramic layer is arranged between the base membrane and the positive polymer layer, and/or a negative ceramic layer is arranged between the base membrane and the negative polymer layer; a binder in the positive polymer layer and a battery positive electrode piece is the same type of binder, and a binder in the negative polymer layer and a battery negative electrode piece is the same type of binder. The diaphragm disclosed by theinvention has the characteristics of small coating amount of coatings on two sides, light and thin coatings, high cohesiveness and the like, so the shaping effect of a battery cell is optimal, and module boxing is facilitated; meanwhile, a module limiting effect is achieved. Moreover, the risk of hole blockage of the diaphragm is low, so the internal resistance of the battery cell is stable and controllable, the lithium precipitation risk is reduced, and the cycle life and safety performance of the battery cell are ensured.

The invention provides a chained static synchronous compensator with an active power adjusting capacity. The chained static synchronous compensator with the active power adjusting capacity comprises three phases of cascading chain links, connection reactors and breakers. Each phase of the cascading chain link comprises n cascading units which are connected in series at the alternating current side. One ends of the three phases of the cascading units are connected to form a neutral point of the static synchronous compensator, and the other ends of the three phases of the cascading units are connected into a three-phase grid through the corresponding connection reactors and the corresponding breakers. The invention further provides a corresponding cascading unit. An STATCOM and a BESS are combined, the capacity of controlling active power and reactive power at the same time is achieved, grid connection of medium voltage and high voltage is achieved in a manner of cascading multiple cascading units, a power switch device which is low in voltage resistance is used for achieving energy conversion of high voltage levels, modularization and redundancy design are easy to achieve, the function of balancing a battery is achieved, meanwhile, a bidirectional DC/DC converter is introduced at the direct current side, and ensuring the cycle life of the battery is facilitated.

The invention provides a testing method for prolonging the cycle life of a lithium iron phosphate power lithium battery. The technical problems that the cycle life of lithium battery is short, and thetesting time is long can be solved. The testing method the steps of two-to-three-step constant-current charge and one-step constant-current discharge, wherein during constant-current charge, a largecurrent is used firstly for conducting constant-current charge till the voltage exceeds the platform voltage, and then a small current is used for conducting constant-current charge till the voltage is the charge cut-off voltage; and after still standing, constant-current discharge is conducted till the voltage is the discharge cut-off voltage. Through the cycle testing method adopting convertingof large-current constant-current charge into small-current constant-current charge, the charge rate of the charge tail section is decreased, and thus polarization of the battery is reduced; on the one hand, the testing period of the cycle life can be shortened on the basis that the cycle life of the battery is ensured; on the other hand, the testing method is closer to a vehicle charge mode, andeffective suggestions can be provided for the charge control strategy of vehicles.

The invention relates to a metal conductive agent and a lithium ion battery using the conductive agent. The metal conductive agent is made of metal which has stable properties under a negative pole potential, such as silver, copper, nickel, stainless steel, nickel-plated silver or nickel-plated copper; and the metal conductive agent has a powder shape or spring shape or hollow semispherical shape or other hollow shapes. In a negative pole, the hollow metal conductive agent is used; by controlling the compaction density of a pole piece, the conductive agent keeps a certain hollow structure after being ground; when a silicon-containing negative pole is charged and expanded, the metal conductive agent is deformed along the expansion direction of negative pole particles to form a certain space, so that the staggering and stripping of the negative pole particles are inhibited to a certain extent; and meanwhile, the contact area of metal and the negative pole particles keeps unchanged or is relatively large when the negative pole particles are extruded and enough conductivity is kept, so that the cycling service life is maintained.

The invention provides a copper nitride modified lithium battery material and a preparation method and application thereof, wherein the lithium battery material comprises a lithium battery base material and a copper nitride coated on or incorporated into the lithium battery base material, wherein the copper nitride is of the formula CuAN, wherein 0.5 <= A <= 4. The copper nitride modified lithiumbattery material provided by the invention can effectively inhibit the lithium dendrite growth of the lithium battery and improve the cycling performance. The battery provided by the invention has better safety, cycle life, power density, magnification performance, energy efficiency and storage life.

The invention discloses a lithium ion battery silicon-carbon composite negative electrode material composite conductive agent, a negative plate and a preparation method of the negative plate. In termsof mass percentage, the composite conductive agent comprises the following solid components: 60-95% of a silicon-carbon composite material, 0.05-0.1% of carbon nanotubes, 0.5-2% of graphene, 0-20% ofan auxiliary carbon black conductive agent, 1-6% of carbon nanofibers, 1-5% of a dispersing agent and 2-8% of a binder. The invention also discloses a negative plate of the composite conductive agentand a preparation method of the negative plate. The lithium ion battery using the silicon-carbon composite negative electrode material composite conductive agent for the lithium ion battery providedby the invention is low in impedance and long in cycle life; and the overall performance of the lithium ion battery is greatly improved, the long-time use requirements of electronic products can be met, the market application prospect of products of battery manufacturers can be improved, and the important production practice significance exists.

The invention belongs to the technical field of chemical-looping combustion, which particularly relates to a method for applying a mesocellular silica hollow sphere iron-based oxygen carrier in the chemical-looping combustion of combustible gas. The method uses a mesocellular silica hollow sphere serving as a carrier and Fe2O3 serving as an active kernel to prepare an iron-based oxygen carrier based on the mesocellular silica hollow sphere. In the oxygen carrier, the mass percent of the Fe2O3 is 60-90%. By utilizing the oxygen carrier, the chemical-looping combustion of single components including H2, CO, CH4 and the like or combustible gas can be achieved. The mesocellular silica hollow sphere serving as the carrier not only has a large cavity structure, but also can store much Fe2O3, and further is provided with a through mesocellular channel so that matter diffusion is not affected. In addition, an inert carrier SiO2 does not react with the Fe2O3, thereby avoiding loss of the Fe2O3. Furthermore, the Fe2O3 kernel is separated through a mesocellular casing, thereby avoiding sintering of the Fe2O3. The oxygen carrier has good reaction activity and stability and long service life in the chemical-looping combustion process of the combustible gas.

The invention provides a sorting method of lithium ion power batteries. According to the sorting method, by means of three reference quantities of the lithium ion power battery capacity, the charge-discharge instant internal resistance and voltage values corresponding to battery different SOCs, the lithium ion power batteries are sorted, the lithium ion power batteries consistent in parameter can be sorted out accurately and reliably so that battery cells good in consistency can be assembled into battery packs, the cycle life and charge-discharge performance of the paired battery packs are guaranteed, and the battery packs can provide electricity for electric equipment safely, stably and efficiently; and the cycle life of the battery packs is prolonged, the charge-discharge performance of the battery packs is increased, and therefore the aim of reducing the cost of the battery packs is achieved.

The invention discloses an electrolyte of a high-voltage fast-charging lithium ion battery and the lithium battery. The electrolyte comprises a non-aqueous organic solvent, an electrolyte salt and anadditive, and the mass percentages of the non-aqueous organic solvent, the electrolyte salt and the additive in the electrolyte are 65%-90%, 10%-20% and 0-15% respectively. The electrolyte can improvethe normal-temperature quick charge cycle performance, the high-temperature storage performance and the low-temperature discharge performance of the high-voltage battery at the same time. The lithiumion battery prepared by adopting the electrolyte has lower surface density, is beneficial to reducing the impedance of the lithium ion battery, is smoother in lithium ion migration, can effectively improve the rate charge-discharge performance, and obviously improves the low-temperature discharge performance at the same time; the electrolyte of the high-voltage fast-charging lithium ion battery has the relatively high charging cut-off voltage, the capacity of the lithium ion battery can be improved by about 15%, and energy density reduction caused by surface density reduction is made up; andcompared with a conventional battery, the lithium ion battery has wider tabs, so that the ohmic impedance of the lithium ion battery is effectively reduced to facilitate electron transmission.

The invention discloses a solvated composite solid electrolyte and a preparation method and application thereof. The method comprises the steps: preparing a composite solid electrolyte film which takes vinylidene fluoride-co-hexafluoropropylene as a main phase and is doped with polyoxyethylene and Li1.5Al0.5Ge1.5(PO4)3 through employing a solution pouring method; soaking the composite solid electrolyte film in solvated ionic liquid to finally obtain the composite solid electrolyte. The composite solid electrolyte prepared by the invention has ionic conductivity equivalent to that of a liquid electrolyte, has good interface compatibility, has certain mechanical strength, has good electrochemical stability and has good safety. The preparation process is simple and the solvated composite solid electrolyte can be produced and used in a large scale. When the solvated composite solid electrolyte is applied to a lithium battery, a high-safety lithium battery can be constructed, and the cyclelife and the cycle performance of the battery can be ensured.

The invention discloses a lithium ion battery ternary positive electrode material with a hollow microsphere structure and a preparation method thereof. The material is prepared from hollow microspheres formed by assembling LiNixCoyMnzO2 primary particles; the diameters of the microspheres are not greater than 20mum; the diameters of the primary particles are not greater than 600 nanometers; x, y and z are proportions of the molar numbers of corresponding elements in the total molar number of three elements of Ni, Co and Mn respectively; x is greater than or equal to 0.5 and small than or equal to 0.6; y is greater than or equal to 0.1 and smaller than or equal 0.2; z is greater than or equal to 0.1 and less than or equal to 0.3; x+y+z=1. A sol-gel method is adopted for preparing the lithium ion battery ternary positive electrode material. The microspheres with hollow structures have large specific surface area, fully contact electrolyte, and are beneficial to reduction of lithium ion diffusion impedance. The positive electrode material has high cycling stability, and damage to the structure of the material caused by size expansion in a cycling process can be reduced.

The invention provides a charging circuit and a mobile terminal, relates to the electronic field, and solves problems that when a lithium battery is normally charged in a low-temperature environment, the circulation life of the battery can be reduced in the prior art, and an existing solving scheme is not suitable for the mobile terminal. The charging circuit comprises a detection module, a first charging module and a second charging module, wherein the detection module is used for detecting the temperature of the battery; the first charging module is used for charging the battery by using first current when the temperature of the battery is more than or equal to a preset value; the second charging module is used for charging the battery by using second current when the temperature of the battery is less than the preset value; the first current is less than the second current. The scheme disclosed by the invention can be used for effectively solving the problem that the lithium battery and the like can not be normally charged in the low-temperature environment, and the charging circuit can be used for ensuring the battery charging efficiency and the battery circulation life, and can be effectively suitable for portable mobile terminal application environments.

The invention discloses a lithium ion battery charging method and device and a computer storage medium. The method comprises the following steps of: carrying out constant-current charging on a lithiumion battery by adopting a first set current value, acquiring a first charging capacity of the lithium ion battery when the current voltage of the lithium ion battery reaches a set voltage, acquiringa second charging capacity of the lithium ion battery based on the first charging capacity of the lithium ion battery, and charging the lithium ion battery until the capacity of the lithium ion battery reaches the second charging capacity, and stopping charging the lithium ion battery.

The invention discloses a storage battery charging formation acid extraction and acid control process. The process comprises the following steps: 1) charging before acid extraction, powering off after charging, and standing for 1-3 hours; 2) carrying out 14.8V/piece -14.6V/piece of constant voltage charging, extracting acid with an acid extraction machine within 2-5 hours in the constant voltage charging process; 3) after acid extraction, carrying out online charging validation, using 0.1C2A current to charge for 10-15 minutes; and troubleshooting the process one by one, absorbing overflowed acid in time if an acid overflowing phenomenon exists, and extracting 2-3ml of internal acid. In order to achieve the uniform acid content in batteries, the process optimally designs the charging voltage, the charging current and the concrete acid extraction time during free acid extraction at the last phase of storage battery charging formation. The amount of electrolyte in the internal parts of the batteries is effectively controlled, and both the consistency and the cycle life of the batteries are ensured.

The invention discloses a high-conduction grid structure of a lead acid storage battery and a processing method of the high-conduction grid structure. The grid structure comprises a grid, wherein a tab is arranged at one side of the grid, at least one high-conduction rib is arranged on the grid, one end of the high-conduction rib is fixedly connected with the tab, and the other end of the high-conduction rib is fixedly connected with a side edge of the grid. The processing method comprises the following steps of (a) covering an acid corrosion-resistant material on a surface of the high-conduction rib, and cutting the high-conduction rib after being covered with the acid corrosion-resistant material to segments; (b) fixing the high-conduction rib which is cut to segments and the grid; and (c) detecting the high-conduction rib and the grid which are fixed so that the high-conduction rib and the grid are enabled to be in a conduction state. The invention aims to provide the high-conduction grid structure of the lead acid storage battery and the processing method of the high-conduction grid structure, which can be used for improving the electrical conducted of the grid and current uniformity during the charge-discharge process.

The invention discloses a high-safety electrolyte, and a preparation method and an application of the electrolyte. The electrolyte utilizes the electronegativity and the low polarity of a fluorine atom in fluoroalkyl ether, so that a freezing point of a mixed solvent consisting of ionic liquid and the fluoroalkyl ether is reduced; the lightning is increased; the oxidation resistance is improved; and the wettability to an electrode is also improved to some extent. A low-viscosity and stable electrolytic solution can be easily obtained on the premise that the high oxidability of the existing electrolyte is not lost. An interfacial film formed by an electrolyte system is high in ionic conductivity and stable, has a relatively wide electrochemical window, and has very high safety.

The invention provides an automation production method used for producing high-voltage lithium cobalt oxide. The method is characterized in that a uniformly-mixed material is filled in a saggar through filling equipment, the saggar is subjected to calcining in a fix-array double-layer roller-way kiln, the material comprises lithium carbonate and cobalt oxide, a manipulator is used for sending thematerial in the calcined saggar into crushing apparatus for crushing, the crushed material is subjected to screening, blending, magnet removal and automation package in order, and the packaged semi-finished product high-voltage lithium cobalt oxide is obtained; the semi-finished product high-voltage lithium cobalt oxide is subjected to wet-method cladding, secondary calcining, pneumatic conveying,screening, magnet removal and automation package in order, and the finished product high-voltage lithium cobalt oxide is obtained. The method has the advantage of easy and accurate control, and is benefit for keeping stable process, the whole system realizes isolation with extraneous foreign matters, effectively controls the foreign matter index of magnetic objects, and guarantees the stability and cycle life of the product under high voltage.