80results about How to "Improve charge and discharge cycle life" patented technology

The invention relates to a silicon / carbon composite microsphere negative electrode material as well as a preparation method and an application for the same. The silicon / carbon composite microsphere negative electrode material is silicon / carbon composite microspheres internally provided with pore structures; and each microsphere comprises a matrix material of hard carbon, and an active material of silicon powder. The preparation method for the silicon / carbon composite microsphere negative electrode material comprises the following steps of: uniformly mixing silicon powder, soft carbon, carbon black, a soluble carbon-containing organic adhesive and a solvent with formula amounts to obtain a slurry; and performing spray-drying and carbonization on the slurry to obtain the silicon / carbon composite microsphere negative electrode material. The silicon / carbon composite microsphere negative electrode material provided by the invention has the advantages of being high in tap density, high in reversible capacity, good in cyclicity, good in rate capability, safe and reliable, and high in first-week coulombic efficiency; the preparation method provided by the invention is simple in process, environment-friendly, low in energy consumption and cost, and easy to realize large-scale production.

The invention discloses a silicon-carbon composite material, a preparation method of the silicon-carbon composite material, and a lithium ion battery containing the silicon-carbon composite material. The preparation method comprises the following steps of: (1) reducing silicon dioxide by using metal with activity larger than that of silicon, so as to obtain a porous silicon-metal oxide composite; (2) corroding the metal oxide by acid, so as to obtain porous silicon; and (3) coating the surface of the porous silicon by carbon by taking a carbon source as a raw material, so as to obtain the silicon-carbon composite material. The silicon in the silicon-carbon composite material is prepared through using a metallothermic reduction method and porous silicon particles prepared through using the metallothermic reduction method are micron-sized and hardly agglomerate; the pore walls and the pore diameters in the porous silicon particles are nano-sized; compared with imporous micron-sized silicon powder, for the silicon-carbon composite material, the porous silicon particles have the characteristics that a diffusion path of a lithium ion in a silicon substrate is shortened, thus being beneficial to charging and discharging with large current, the pores can hold the volume expansion of silicon during silicon intercalation and the charging and discharging cycle life of the material is prolonged. The surfaces of the porous silicon particles are coated with a carbon layer with the certain pores and the conductivity of the silicon-carbon composite material is enhanced.

The invention relates to a method for manufacturing a super-thin electrolytic copper foil. (1) An electrolyte contains 90-130g / L copper, 130-150g / L sulphuric acid. (2) The electrolyte is heated 55-66 DEG. C, 5-12 parts dithio-bis-propylene sulfonic acid sodium salt, 0.1-0.9 parts urinary sulfur, 0.9-2.2 parts 2-mercaptobenzothiazole and 20-50 parts polyethyleneglycol molecular weight 400 by weight ratio are added into the electrolyte in 1000 volume part per hour for entering an anode groove after being mixing well. (3) In an electric field, the current density is 65-75A / dm(2) for reacting and obtaining the super-thin electrolytic copper foil. The super-thin electrolytic copper foil crystal is tiny and uniform, difference of thickness uniform is less than 0.3 mum, Ra is less than 0.2 mum, Rz is not larger than 2.0 mum, tensile strength is in between 380-420 N / mm(2). A lithium battery with big capacity manufactured by the super-thin electrolytic copper foil has long cycle life of charge / discharge, and is not easy rupture during over charge.

The present invention discloses a all-solid lithium secondary battery that has large chare and discharge output current denseness and excellent charge and discharge cycle life which can be easily manufactured at low cost. In the manufacturing process of the all-solid lithium secondary battery, a new lithium ion conductor with ionic conduction improved can be obtained through vitrification to mixed electrolytes by mixing Alpha-oxide of alumina in various sulfide system lithium ion conductivity solid electrolyte. The electrolytes layer 8 used the lithium ion conductor, and positive and negative electrode (I), (II) are formed by positive and negative electrode material 3, 7 are constituted. Subsequently, cascading at least 1 layer in positive and negative electrode (I), (II) with electrolytes layer, and producing battery while electrolytes not crystallizes by heating and compressing as a whole.

The invention provides a graphene oxide / metal organic framework composite material. The composite material is prepared from graphene oxide, cobalt acetate tetrahydrate and 2, 5-dihydroxyterephthalic acid which are mixed based on a certain proportion through a solvothermal method. The preparation method comprises the steps of (1) dispersing graphene oxide into a solvent to obtain a graphene oxide solution; (2) adding the cobalt acetate tetrahydrate and 2, 5-dihydroxyterephthalic acid into deionized water to form a mixed solution; (3) enabling the obtained mixed solution to be mixed with the obtained graphene oxide solution, and then putting the mixture into a reaction kettle; and (4) performing constant-temperature heating in a drying oven, taking out the product, washing and drying. According to the application of the composite material as a negative electrode material of a lithium ion battery, the specific capacity value can reach 520-600mAh g<-1> at current density of 100mAg<-1> in an electrochemical performance test. The composite material is high in cycling stability, long in charging-discharging service life, and has wide application prospect in the field of the lithium ion battery.

The invention discloses a silicon-carbon composite material and a preparation method thereof, and a lithium ion battery. The method comprises the following steps of (1) coating porous carbon on porous silicon dioxide; (2) reducing the porous silicon dioxide to porous silicon by using a metal more active than silicon to obtain a porous carbon-porous silicon-metal oxide composite; and (3) etching the metal oxide in the carbon-porous silicon-metal oxide composite to obtain the silicon-carbon composite material. In the silicon-carbon composite material, the porous silicon is prepared by a metallothermic method; the porous silicon particles prepared by the metallothermic method are in micron size, so that agglomeration rarely occurs; and pore walls in the porous silicon particles and apertures are in nano size. Compared with imporous micron silicon powder, the silicon-carbon composite material shortens diffusion paths of lithium ions in silicon matrix, thereby facilitating large-current discharge; the holes in the porous silicon particles can accommodate volume expansion in a silicon-embedding process; and charge-discharge cycle life of the material is prolonged.

The invention relates to lithium-aluminum alloy, and a production method and use thereof, which belong to the technical field of a secondary battery negative material. The lithium-aluminum alloy has a longer charging-discharging cycling life. The lithium-aluminum alloy consists of the following components according to weight percent: 0.1 to 4.0 percent of aluminum, and the balance of lithium and unavoidable impurities. By adding the aluminum in specific content to the lithium, the performance of the pure metal lithium is modified, and not only can the advantages of the lithium capacity be maintained, but also a dendritic crystal inhibition effect can be improved. A single phase is used in the charging and discharging processes, the phase change can be avoided, and thus the charging-discharging cycling life of the lithium-aluminum alloy can be prolonged.

The invention relates to a sulfonated polymer applied to a lithium battery electrode as a binder as well as a method for preparing the lithium battery electrode. The sulfonated polymer is used as the binder in electrode slurry of the lithium battery electrode, the obtained lithium battery electrode is used for assembling a lithium battery, and the lithium battery is relatively long in charging-discharge cycle life and stable in work under a relatively high current density. The sulfonated polymer with a sulfonic acid group has excellent capacity of transferring lithium ions, so that the lithium ions can be rapidly transmitted back and forth between an electrode active material and an electrolyte, and the lithium battery which is stable to run under the rapid charging-discharging condition can be obtained. The sulfonated polymer which is used as the binder is sufficient in cohesion force and binding strength, and the electrode active material and a conductive medium are stuck onto a current collector by the sulfonated polymer and are unlikely to fracture and dust, so that the lithium battery has sufficient capacity and cycle performance as well as excellent rate capacity.

A nonaqueous electrolyte secondary battery includes a nonaqueous electrolyte and a positive electrode including an active material containing lithium composite oxide powder, the lithium composite oxide powder includes secondary particles, exhibits a peak intensity ratio satisfying the following formula (4), satisfies the following formula (5), and has a particle distribution wherein a particle diameter at a volumetric cumulative frequency of 90% (D90) falls within the range of 10 to 25 μm, and the nonaqueous electrolyte contains a sultone compound including a ring having at least one double bond; 2≦(I003 / I104)<5   (4) 0.95≦(XLi / XM)≦1.02   (5)

The invention provides positive slurry of a lithium ion battery as well as a preparation method and application of the positive slurry of the lithium ion battery. The preparation method of the positive slurry of the lithium ion battery comprises the following steps: (1) uniformly agitating and mixing a solvent and an oily binding agent to obtain a mixture A; (2) adding graphene into the mixture A at 25-40 DEG C and agitating uniformly to obtain a mixture B; and (3) adding nickel cobalt lithium aluminate powder into the mixture B; agitating to obtain the positive slurry; and during the agitating period, adding oxalic acid to adjust the pH value of the slurry to 8-9.5. The battery prepared from the positive slurry of the lithium ion battery has the excellent charging / discharging circulating service life and has the high power and safety performance. The battery prepared by the invention is applicable to the fields of hybrid electric vehicles, telecommunication networks, outer spaces, defending equipment and the like.

The invention discloses a gelled electrolyte of a lead-acid storage battery and a preparation method thereof. The electrolyte comprises the following components: sulphuric acid, silicon dioxide, sodium sulfate, polyacrylamide, polyacrylate sodium, sodium molybdate, calcium molybdate, magnesium molybdate, sodium tungstate, potassium sulfate and deionized water; the method comprises the following steps of: adding the sodium sulfate into dilute sulphuric acid to obtain a dilute sulphuric acid mixed solution, then adding the dilute sulphuric acid mixed solution into a sodium silicate solution to obtain a silicon dioxide colloidal suspension, next firstly adding the sodium molybdate, the calcium molybdate, the magnesium molybdate and the sodium tungstate into a vapor-phase silicon dioxide nano-powder suspension to obtain a nano vapor-phase silicon dioxide powder suspension, then preparing a polyacrylamide solution and a polyacrylate sodium solution, then firstly uniformly mixing the silicon dioxide colloidal suspension and the nano vapor-phase silicon dioxide powder suspension, and then adding the polyacrylamide solution and the polyacrylate sodium solution into the mixed suspension to prepare the gelled electrolyte of the lead-acid storage battery. The gelled electrolyte of the lead-acid storage battery can be widely used in a storage battery with the capability of more than 20AH.

The invention provides an anode material, an anode and a lithium ion battery, and relates to the technical field of lithium ion batteries. The anode material includes the following components in weight percentage: 59-90% of anode active materials, 9.5-40% of lithium and manganese enriched solid solution materials, 0.1-10% of a conductive agent and 0.1-10% of an anode binder. Through adopting the anode material, the technical problems in the prior art that the preparation technology is complicated, the condition is strict, the cost is high and the effective control to the lithium supplement amount is difficult in reality as lithium powder or lithium sheets is adopted as a lithium supplement material in the silica-based cathode lithium ion battery are alleviated, so that the technical effects that preparation technology is simplified, and the lithium supplement cost is reduced are reached.

A nickel-series rechargeable battery whose cathode active material comprising a material containing an amorphous phase-bearing nickel hydroxide particulate which in X-ray diffraction using K alpha -rays of Cu as a radiation source, has a diffraction peak of a (001) face appeared near a diffraction angle 2 theta = 19 DEG having a half-value width of more than 1.2 DEG and has a diffraction peak of a (101) face appeared near a diffraction angle 2 theta = 38 DEG having a half-value width of more than 1.5 DEG . A process for the production of said rechargeable battery is also provided.

The invention relates to a zinc-polyaniline cell and a preparation method thereof. The technical problems of high cost, low specific energy, short service life and heavy pollution of the existing chargeable cell are solved. The cell comprises a cell positive electrode, a cell negative electrode, an electrolyte and a membrane, and the cell positive electrode is made of polyaniline and carbon composite materials. The cell can be widely applied to the field of cell preparation.

The invention discloses guanidinium salt ionic liquid electrolyte for a lithium secondary battery. The guanidinium salt ionic liquid electrolyte consists of guanidnium salt ionic liquid, lithium salts and an organic electrode solvent. The guanidinium salt ionic liquid electrolyte for the lithium secondary battery has the advantages of small viscosity, satisfactory electrochemical stability, excellent charge-discharge performance (in particular under big multiplying power), high coulomb efficiency, etc. As the melting point of the electrolyte is low, the invention can be used at low temperatures; as the steam pressure is extremely low, the invention does not volatilize after being heated so as to avoid the expansion and explosion of electromagnetic devices; and as the electrolyte is not easy to be combusted, the safety and stability of the invention is high. The granidinium salt ionic liquid electrolyte is composed of N,N,N',N'-tetramethyl-N'', N''-diethyl granidinium salt ionic liquid, lithium di(trifluoromethyl sulfuryl) imide with the molarity of 0.4mol / L and vinylene carbonate (the weight ratio of the vinylene carbonate and a ionic liquid is 1 to 20); in the button cell with LiCoO electrode as a positive electrode, when the charging and discharging multiplying power is 0.5C, the initial capacity of the battery is 128Ah / mg and after fifty times of cycles of charging and discharging processes, and the capacity is 118Ah / g so the conservation rate of the capacity is 92.2 percent.

The invention discloses a frequency converter LVRT supporting apparatus based on a super capacitor. Currently relatively severe voltage sags caused by certain power grid faults lead to the shutdown of a factory frequency converter. The apparatus is characterized in that a super capacitor energy-storage unit is connected with a frequency converter direct current link through a non-return diode; a frequency converter rectifying unit is prevented for bearing extra super capacitor charging currents by using the unidirectional conduction of the diode; the energy stored by the super capacitor is guaranteed to be only transmitted to a main circuit during a voltage drop period; the input side of a super capacitor charging unit is connected with an AC power supply; the output side of the super capacitor charging unit is connected with the super capacitor energy-storage unit; and a super capacitor voltage-sharing unit is connected with the super capacitor energy-storage unit. The apparatus which makes a common frequency converter have LVRT capabilities can satisfy frequency converter LVRT supporting demands in each industrial field.

The invention discloses a long-life lead acid secondary battery and intends to provide a long-life lead-acid battery which can effectively improve the problem of negative electrode vulcanization and reduce the occurrence of the negative electrode vulcanization failure, so as to effectively prolong the charging and discharging cycle life of the lead acid secondary battery. The long-life lead acid secondary battery comprises an electrode group, which comprises a plurality of positive and negative plates. The negative plates comprises a negative grid, which comprises a grid inner core made of highly conductive metal and a lead or lead alloy cladding layer cladding the surface of the grid inner core.

The invention relates to an all-solid-state power storage device which mainly comprises an electrode, a charge storage material and an insulating material. The charge storage material comprises a positive charge storage material and an electronic storage material which are separated by the insulating material, and a sandwich structure of an electrode / the positive charge storage material / the insulating material / the electronic storage material / an electrode is formed. The positive charge storage material contacts with a positive electrode, and the electronic storage material contacts with a negative electrode. The all-solid-state power storage device is high in energy density and power density, environment-friendly, and high in safety.

The invention provides an air electrode for a metal air battery and the metal air battery. The air electrode is made of a fibrous conductive material with a porous structure, a relatively good air electrode with a relatively stable mechanical performance is provided for the metal air battery, and a chemically stable and relatively conductive supporting structure is also provided for a catalyst; metal catalyst particles are deposited in the porous structure of the air electrode, so that the oxygen reduction reaction rate of the battery can be increased. The invention provides the metal air battery. The metal air battery comprises the improved air electrode, wherein an oxygen selectivity membrane is arranged at one side of the air electrode, and oxygen is selectively filtered from air, so that the oxidization reduction reaction rate can be increased by multiple times; compared with an existing metal air battery, the metal air battery is higher in output power and longer in charging-discharging cycle life and can be used as a battery of an electric car.

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are provided. The non-aqueous electrolyte solution includes an organic solvent, an ionizable lithium salt, a dinitrile compound including an ether bond represented by Chemical Formula 1, and an aliphatic dinitrile compound represented by Chemical Formula 2. The lithium secondary battery including the non-aqueous electrolyte solution having the possibility of generating a swelling phenomenon while storing or charging / discharging at a high temperature may be restrained. In addition, a cycle life of the charging / discharging may be improved.

The invention relates to a nanometer copper oxide composite material, a preparation method thereof, a super-capacitor electrode and a super-capacitor. The hydrothermal method is used for directly enabling a copper oxide nanometer structure to grow on the surface of foamy copper. The obtained three-dimensional net-like nanometer copper oxide composite material can be applied to construction of the super-capacitor electrode, so that the specific capacity of the super-capacitor is improved, and the cycle life is prolonged.

The invention discloses praseodymium-and-neodymium-free nickel AB5 type hydrogen storage alloy. The praseodymium-and-neodymium-free nickel AB5 type hydrogen storage alloy is characterized in that the formula of the AB5 type hydrogen storage alloy is La1-xCexNiaCobMncAldCUeMf, wherein M is one, two or more than two of Fe, Sn and B; x, a, b, c, d, e and f represent a molar ratio; x is more than or equal to 0.05 and less than or equal to 0.35; a is more than or equal to 3.70 and less than or equal to 4.2; b is more than 0 and less than or equal to 0.75; c is more than or equal to 0.15 and less than or equal to 0.42; d is more than or equal to 0.20 and less than or equal to 0.40; e is more than or equal to 0.02 and less than or equal to 0.30; f is more than or equal to 0 and less than or equal to 0.10; and the sum of a, b, c, d, e is more than or equal to 4.70 and less than or equal to 5.30. The hydrogen storage alloy does not contain praseodymium or neodymium, so production cost can be reduced, the corrosion resistance of the alloy can be improved, the service life of the alloy can be prolonged, and the alloy is easy to activate.

The present invention relates to an inner mixed and inner parallel hybrid lead-carbon battery. The structural feature of the battery is that a negative electrode of a lead-carbon battery is replaced with a negative electrode of an inner mixed lead-carbon battery. Since the charge acceptance capability, deep discharge capability and charge-discharge cycle stability of the negative electrode of theinner mixed lead-carbon battery are much higher than that of the negative electrode of the lead-carbon battery, the negative electrode of the inner mixed lead-carbon battery is introduced into an inner parallel lead-carbon battery, and the improvement of the output performance and stability of the battery is facilitated. An inner mixed and inner parallel hybrid lead-carbon super battery with different layout forms of negative electrodes has different properties, and different application requirements can be satisfied. The charge-discharge reaction reversibility, charge-discharge cycle life, and the charge acceptance capacity of the inner mixed and inner parallel hybrid lead-carbon battery are significantly better than that of a conventional lead-acid battery.

The invention relates to a negative electrode of a lead-carbon battery. The negative electrode contains 0.1-50wt% of modified carbon fibers, and the modified carbon fibers are obtained by activating and then poisoning carbon fibers. The cost of the lead-carbon battery is reduced, the internal resistance of the battery is reduced by a conductive network structure in a negative plate, the sulfationof the battery is effectively inhibited, the water loss during the cycle life process of the lead-carbon battery is reduced, the hydrogen evolution overpotential is improved, the high-rate partial state of charge (HRPSOC) of the lead-carbon battery in some nuclear power states is extended, and the battery charge acceptance ability and low temperature start performance are enhanced.

The invention relates to a negative electrode for a liquid-rich internal mixed lead-carbon battery and preparation and application thereof. The negative electrode comprises a lead material, and the negative electrode contains 0.1-10wt% of carbon material which is subjected to poisoning processing, wherein the carbon material is carbon fibers or activated carbon or a combination of the carbon fibers and the activated carbon. The liquid-rich internal mixed lead-carbon battery has an energy density similar to that of a lead-acid battery, high current impact resistance ability similar to that of an internal parallel type lead-carbon battery and a charge-discharge cycle life of 3 to 5 times of that of a liquid-rich lead-acid battery, and the liquid-rich internal mixed lead-carbon battery is suitable for the start-stop application of a new energy vehicle and the replacement of an existing fuel vehicle vehicle-borne battery.

The invention relates to a multi-hole nanometer copper oxide composite material, a method for preparing the multi-hole nanometer copper oxide composite material, supercapacitor electrodes and a supercapacitor. Multi-hole nanometer copper oxide materials directly grow on a copper substrate according to a hydrothermal method to acquire the multi-hole nanometer copper oxide composite material capable of being directly used for making the supercapacitor electrodes. Good conductivity of the metal copper substrate is combined with the superhigh capacitance performance of the nano copper oxide materials to improve the specific capacity of the supercapacitor and prolong the cycle life of the supercapacitor.

A standby power source for a dolly shot, which integrates the functions of power supply and charging, achieves a good heat dissipation effect and saves space, comprises a battery pack shell, wherein a battery pack cover is buckled above the battery pack shell; a battery pack bottom plate is designed below the battery pack shell; a battery pack plugboard is inserted and connected between the battery pack shell and the battery pack bottom plate; and the battery pack shell is fixedly connected with the battery pack plugboard. The standby power source is characterized in that a battery pack which comprises monomeric electric cores is mounted in the battery pack shell; the monomeric electric cores are fixedly connected and are ranked in a semi-close packed manner; a plug connector mounting groove is designed above the battery pack cover; the side surface of the battery pack is fixedly connected with a protective plate; a 45A red-black Anderson plug connector and a battery pack lead are pressed and connected onto the protective plate; and the 45A red-black Anderson plug connector is positioned in the plug connector mounting groove.

The invention discloses an anode active substance for a rechargable lithum battery, a manufacturing method thereof and a rechargable lithium battery containing the same. An embodiment of the invention provides an anode active substance which comprises a lithium manganese-based oxide core; and a coating on a surface of the lithium manganese-based oxide, the coating comprising particles, the particles comprising a zirconium compound or a zirconium compound and a fluoride.