32results about How to "Improved cycle rate performance" patented technology

The invention relates to a composite binder for a lithium ion battery, a positive pole slurry of the lithium ion battery and the lithium ion battery and belongs to the technical field of lithium ion batteries. The composite binder for the lithium ion battery is prepared from, by weight, 94-98 parts of adhesive and 1-3 parts of ethylene carbonate. The composite binder for the lithium ion battery contains the adhesive, is also added with the ethylene carbonate and is adopted to prepare a pole piece, the compatibility of the binder and electrolyte in the pole piece can be improved, change of an electrode material layer on the pole piece can be avoided in the charge and discharge process of the lithium ion battery, the stability of the electrode material layer is improved, and further the cycle performance of the lithium ion battery is improved.

The invention provides a quasi-solid polymer electrolyte for a lithium ion secondary battery and a preparation method. The electrolyte has a fixed shape and is in a quasi-solid mode with certain fluidity, and a polymer membrane is a copolymer formed by PEGMEM (poly (ethylene glycol)methyl ether methacrylate) monomers and SMA (stearyl methacrylate) monomers and doped with organic lithium salt. The PEGMEM-co-SMA amorphous solid prepared through a polymerization reaction is doped with the organic lithium salt to obtain a mixture, and the mixture is dissolved in an organic solution, is dropped on a diaphragm material and is subjected to vacuum drying by an evaporation solvent to obtain the polymer electrolyte. According to the PEGMEM-co-SMA copolymer, crystallization of ethylene oxide (EO) segments in the PEGMEM monomers is effectively inhibited, the electrical conductivity of the all-solid-state polymer electrolyte is improved, further, the polymer appearance is in a high-adhesion amorphous state, the polymer can be sufficiently contacted with a positive pole and a negative pole and has high interface stability and electrochemical performance, and accordingly, the circulating rate performance of the battery is improved.

The invention discloses a sodium ion battery anode material for reducing graphene oxide and supporting antimony and a preparation method thereof, and relates to the technical field of electrochemical energy storage. The invention uses antimony trichloride, ammonia water and flake graphite as raw materials, uses chemical oxidation method and exfoliation method to prepare graphene oxide, improves liquid phase synthesis method to load antimony precursor particles on the graphene oxide sheet layer, and finally conducts thermal reduction treatment The anode material of sodium ion battery supported by reduced graphene oxide with antimony is obtained. The sodium ion battery negative electrode material of the reduced graphene oxide supported antimony of the present invention has excellent cycle rate performance; at 2A g ‑1 After 100 cycles at high current density, Sb‑rGO still maintains 140mAh g ‑1 The above capacity is maintained, and the coulombic efficiency is maintained at more than 97%; the preparation method provided by the present invention does not need to add surfactants and reducing agents, the method is simple, the cost is low, and it is suitable for large-scale preparation.

The invention provides an activation method of a high-capacity lithium ion battery negative electrode material. The activation method comprises the following steps of 1) performing film formation on agraphene oxide aqueous solution in a porous template by a drop-coating method, and allowing to stand; 2) spraying the graphene oxide aqueous solution onto the dried three-dimensional graphene oxide / template attachment material, and drying for use; 3) impregnating the material in an aqueous solution dissolved with an activation agent, and allowing to stand after ultrasonic processing; and 4) placing the product in a tubular furnace for oxygen-free sintering after drying, cooling the sintered product to a room temperature, washing the product with deionized water until washing water is neutral,and drying, thereby obtaining the activated graphene / template negative electrode material. By the activation method, the inherent characteristic of a two-dimensional graphene sheet is maintained, meanwhile, graphene and the porous template are more uniformly distributed, the active sites of graphene phase-template phase-electrolyte phase catalytic reaction are remarkably improved, and the power density and the cycle rate performance are remarkably improved.

The invention discloses a preparation method of a submicron regular octahedral structure nickel manganate material. The manganese source, the nickel source and the lithium source are accurately weighed according to the stoichiometric ratio; the manganese source and the nickel source obtained by weighing are mixed and mixed together Carry out ball milling; dry the mixture of manganese source and nickel source obtained by ball milling into powder; weigh a certain amount of oxalic acid, and mix the above-mentioned oxalic acid, the weighed lithium source and the mixture of manganese source and nickel source dried into powder by ball milling ; Add a certain amount of PEG to the mixture obtained above, stir to obtain a black-gray colloidal mixture, and preheat the black-gray colloidal mixture; first heat the mixture obtained by preheating at 300 ° C for 1 to 5 h, and then The temperature is raised to 800° C. for 1 to 5 hours, and then annealed to room temperature to obtain a submicron regular octahedral structure lithium nickel manganate material. The present invention utilizes a low-cost high-temperature solid-phase method combined with a polymer-assisted method to obtain a submicron regular octahedral structure lithium nickel manganate material, which greatly improves the cost performance.

The invention relates to the technical field of lithium ion batteries, and discloses a modified nickel-cobalt lithium aluminate cathode material, a preparation method and application thereof. The positive electrode material has a composition shown in general formula I: Li 1+α Ni x co y Al z m d G e P f o 2 Formula I, wherein, 0≤α≤0.1, 0.80≤x≤0.99, 0.01≤y≤0.20, 0.01≤z≤0.06, 0≤d≤0.005, 0≤e≤0.004, 0≤f≤0.04, M is selected from At least one of Ca, Sr, Ba, Zr, Y, Ce, Mg, Ti and Mn; G is selected from at least one of Ca, Sr, Ba, Zr, Y, La, Ce, Mg, Ti, B and W One; P is at least one selected from Ni, Co, Al, Nb, W and Mn; wherein, d, e and f are not 0 at the same time. The positive electrode material has high cycle rate performance and low surface residual Li, and the battery made from it has good cycle stability, thermal stability and safety performance.

The invention discloses an SnS2-C negative electrode nanocomposite and a preparation method and an application therefor. The composite negative electrode material consists of SnS2 nanoparticles and a carbon material wrapping the SnS2 nanoparticles; the grain diameter of the SnS2 nanoparticles is less than 100 nm, and the SnS2 nanoparticles are uniformly distributed in the carbon material; and the mass ratio of the SnS2 nanoparticles to the carbon material is 0.625-12.5:1. The preparation method for the SnS2-C negative electrode nanocomposite comprises the following steps: performing ball milling on stannic disulphide for the first time to obtain the SnS2 nanoparticles; adding the SnS2 nanoparticles into a glucose solution for performing ball milling for the second time to obtain a mixture; and drying the mixture and then performing thermal treatment on the dried mixture to obtain the SnS2-C nanocomposite. The SnS2-C negative electrode nanocomposite is high in circulation rate capability, high in capacity retention ratio, can be applied to the field of a lithium ion battery, and is bright in the application and industrial prospects.

The present invention relates to an intrinsically safe electrolyte for a secondary lithium-sulfur battery and a preparation method thereof. The electrolyte comprises a lithium salt and an organic solvent, and the organic solvent is a phosphate solvent or a phosphate solvent and a hydrofluoroether. A mixed solvent composed of a similar solvent; lithium salt is added to the organic solvent, and the electrolyte is uniformly stirred to form an electrolyte, that is, an intrinsically safe electrolyte for a secondary lithium-sulfur battery is prepared. Compared with the prior art, the lithium-sulfur battery after using the electrolyte can realize safe cycling, which is embodied in the uniform lithium deposition morphology, no obvious dendrites and complete flame retardancy. On this basis, the electrochemical performance is significantly improved. , which is more advantageous than other sulfur materials and lithium metal batteries.

The invention provides a ternary precursor with a composite hetero-structure. The molecular formula of the ternary precursor is Ni<1-a-b>CoM(OH)2@Ni<1-x-y>Co<x>M<y>O<z>, wherein 0<a<1, 0<b<1, 0<a+b<1, 0<x<1, ,0<y<1, 0<x+y<1, 1<z<1.5, and M represents Mn or Al. The ternary precursor comprises a ternary oxide precursor and a ternary hydroxide precursor. The ternary hydroxide precursor is coated on the surface of the ternary oxide precursor. The molecular formula of the ternary oxide precursor is Ni<1-x-y>Co<x>M<y>O<z>, and the molecular formula of the ternary hydroxide precursor is Ni<1-a-b>CoM(OH)2. The invention further provides a preparation method of the ternary precursor. According to the preparation method, a spray pyrolysis method and a co-precipitation method are combined, the ternary oxide precursor obtained by spray pyrolysis is taken as the seed crystal, then a layer of ternary hydroxide precursor is coated on the surface of the ternary oxide precursor through theco-precipitation method to obtain the ternary precursor, and the ternary precursor and lithium salts are mixed and sintered to prepare the ternary cathode material. The ternary cathode material has the advantages of good layered structure, high initial efficiency, high specific capacity, and excellent circulating ratio performance.

The invention discloses a magnesium-based composite material and application of the material in a lead acid storage battery as well as a method for preparing the lead acid storage battery by utilizing the material. The preparation method of the magnesium-based lead acid storage battery with ultra-low temperature, long service life and high capacity comprises the following steps: preparing a magnesium alloy at first; preparing the magnesium-based composite material; mixing the prepared magnesium-based composite material with positive and negative electrode materials of the lead acid battery to prepare paste; preparing an un-formed magnesium-based lead acid storage battery according to the preparation method and the process condition of the standard lead acid storage battery; and preparing the magnesium-based lead acid storage battery according to a certain formation condition. The prepared magnesium-based lead acid storage battery has the characteristics of ultra-low temperature, high capacity, high magnification and long cycle life, and has a good industrial application prospect; the performance of the magnesium-based lead acid storage battery is obviously superior to that of the traditional lead acid storage battery.