78results 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 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≦(X_Li/X_M)≦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 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 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.

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 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 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.

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.