13results about How to "High initial capacity" patented technology

The invention relates to the field of lead storage batteries, and discloses a lead storage power battery positive electrode lead paste additive and application thereof. The additive is composed of a tin-antimony compound, 4BS and graphite, the addition amount of the tin-antimony compound is 0.1%-0.5% of the weight of lead powder used in the positive electrode of the lead storage power battery, the addition amount of the 4BS is 0.5%-2% of the weight of the lead powder used in the positive electrode of the lead storage power battery, and the addition amount of the graphite is 0.1%-0.3% of the weight of the lead powder used in the positive electrode of the lead storage power battery. The additive disclosed by the invention is used in the positive lead plaster of the lead storage power battery, and can improve the porosity of a polar plate, improve the charge-discharge efficiency and the initial capacity of the battery and guarantee the cycle service life of the battery at the same time.

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a method for preparing a lithium ion battery negative electrode material based on a biomass material, and the method comprises the following steps: 1, pretreating the biomass material, including cleaning and drying to remove impurities and moisture; step 2, carrying out enzyme catalytic degradation on the pretreated biomass material by utilizing cellulase to generate a porous structure material with a high specific surface area; and step 3, carrying out nitrogen-sulfur double-doping reaction in the degraded biomass material, which comprises taking urea and sodium thiosulfate as doping sources, and carrying out reaction under the condition of 40-60 DEG C through nitration enzyme catalysis. Through an enzyme catalytic degradation process, the specific surface area of the biomass material is effectively increased, a porous structure is generated, and the improvement provides more lithium ion intercalation / deintercalation active sites, so that the initial capacity and the overall electrochemical performance of the negative electrode material are remarkably improved.

This invention discloses a high-performance polymer electrolyte based on a functionalized fluorinated ether diluent and its preparation method, relating to the field of electrochemical energy storage materials technology. The high-performance polymer electrolyte comprises: a polymer matrix, a lithium salt, an organic dispersion solvent, and a functionalized fluorinated ether diluent. By introducing a fluorinated ether diluent with a specific structure, this invention synergistically regulates the crystallization behavior of the polymer matrix and the lithium-ion solvation structure, solving core problems in traditional polymer electrolytes such as low ionic conductivity, poor interfacial stability, and lithium dendrite growth. The resulting electrolyte possesses high ionic conductivity, high lithium-ion transference number, and excellent interfacial stability, making it suitable for high-energy-density lithium metal batteries.

The application discloses a carbon-based negative electrode material and a preparation method and application thereof. The carbon-based negative electrode material comprises a porous carbon base and an encapsulant for converting open pores on the surface of the porous carbon base into closed pores; and the encapsulant is discrete encapsulating particles and / or a continuous encapsulating layer. The carbon-based negative electrode material disclosed by the application has high capacity, high initial efficiency, super-long cycle stability, excellent rate performance and wide temperature range adaptability.

Provided is a secondary battery electrode mixture having good properties, a secondary battery electrode mixture sheet containing the electrode mixture, and a secondary battery using the secondary battery electrode mixture sheet. Also provided is a method for producing an electrode mixture sheet containing a polytetrafluoroethylene resin having a fine fiber structure. The secondary battery electrode mixture includes an electrode active material and a binder. The binder is a polytetrafluoroethylene resin, and the polytetrafluoroethylene resin has a fibrous structure with a fibril diameter (median value) of 70 nm or less. In addition, the secondary battery electrode mixture sheet contains that electrode mixture.

The present invention relates to a lithium secondary battery and a method for manufacturing a lithium secondary battery, in which the lithium secondary battery comprises: a positive electrode comprising a positive electrode current collector and a positive electrode active material layer provided on the positive electrode current collector; a negative electrode including a negative electrode current collector, a negative electrode active material layer provided on the negative electrode current collector, and a solid electrolyte layer provided on the negative electrode active material layer; a separator disposed between the positive electrode and the negative electrode; and an electrolyte, wherein the A value in the following mathematical formula 1 may be 10% or more. [mathematical formula 1] A = {(F + C) / (F + C + G + M + E)} * 100F and C are respectively a fluorine-containing group content (unit: [mu] g / cm < 2 >) and a carbonate group content (unit: [mu] g / cm < 2 >), which are determined by capillary electrophoresis (CE) analysis of the solid electrolyte layer, and G, M, and E are respectively an ethylene glycol group content (unit: [mu] g / cm < 2 >), a methyl group content (unit: [mu] g / cm < 2 >), and an ethyl group content (unit: [mu] g / cm < 2 >), which are determined by capillary electrophoresis (CE) analysis of the solid electrolyte layer. This is determined by Nuclear Magnetic Resonance (NMR) spectroscopic analysis of the solid electrolyte layer.

The invention discloses lead paste for a lead-acid battery and a preparation process of the lead paste, and belongs to the technical field of lead-acid batteries, the lead paste comprises the following raw materials in parts by weight: 90-100 parts of lead powder, 0.1-0.2 part of high-strength short fiber, 15-20 parts of lead tetraoxide, 1-1.5 parts of tetrabasic lead sulfate, 5-12 parts of modified graphene, 0.2-0.3 part of bismuth oxide, 0.1-0.15 part of stannous mono-sulphate, 10-15 parts of sulfuric acid solution and 8-16 parts of deionized water; the modified graphene is prepared by the following steps: uniformly mixing concentrated sulfuric acid and sodium nitrate in a reaction flask, and slowly adding graphite powder under an ice-water bath condition. By optimizing the formula and the preparation process of the lead paste for the lead-acid battery, and particularly introducing the modified graphene, the conductivity and the thermal stability of the lead paste are remarkably improved, the binding force between the lead paste and a grid is enhanced, and the falling of active substances is reduced, so that the cycle life of the battery is remarkably prolonged, and the capacity of the battery is remarkably improved.

The invention discloses a method for constructing a three-dimensional structure material based on a metal modified conjugated covalent organic plane Co-TCNB COF and application, and the method comprises the following steps: adding 1, 2, 4, 5-tetracyanobenzene and cobalt metal salt into an organic solution, and mixing; the preparation method comprises the following steps: heating to react, collecting precipitate, carrying out vacuum drying to obtain Co-TCNB COF, adding the Co-TCNB COF and piperazine or pyrazine into a solution to react under the assistance of ultrasonic waves, centrifuging, and carrying out vacuum drying to obtain the three-dimensional structure material. An interlayer bridging ligand piperazine or pyrazine is introduced on the basis of a Co-TCNB planar material to construct a Co-TCNB-PIP or Co-TCNB-PA material with a stable three-dimensional structure, the interlayer bridging ligand can avoid a serious pi-pi lamination phenomenon between the planar materials and promote transfer of interlayer charges, and when the Co-TCNB-PIP or Co-TCNB-PA material is used as a lithium battery negative electrode material, the material has a good application prospect. And the material has higher cycling stability, high conductivity and better ion diffusion dynamic characteristics.

The present invention provides a negative electrode active material having improved conductivity and durability by restoring damage to silicon crystals during secondary granulation. An embodiment of the present invention provides a negative electrode active material comprising: second silicon particles formed by aggregating first silicon particles; and a carbon layer on the second silicon particles, the carbon layer satisfying the formula 1 in a differential capacity plot of a half-cell including the negative electrode active material, the differential capacity plot of the half-cell including the negative electrode active material.

The invention relates to the technical field of sodium metal negative electrodes, in particular to a sodium metal negative electrode self-supporting material and a preparation method and application thereof. According to the preparation method of the sodium metal negative electrode self-supporting material, commercial carbon cloth is subjected to ultrasonic cleaning and drying and then is treated in a plasma treatment machine under atmospheric pressure, and the sodium metal negative electrode self-supporting material is obtained. According to the invention, the carbon cloth is treated through atmospheric pressure plasmas for the first time, high electronegativity elements such as N and O are introduced to the carbon cloth to improve the sodium affinity of the carbon cloth, and the carbon cloth is used as a self-supporting material of a sodium metal negative electrode. The carbon cloth subjected to plasma treatment shows lower nucleation overpotential for sodium metal, and a symmetrical battery assembled by a sodium metal negative electrode shows better electrochemical performance, has smaller voltage distribution and is more stable in operation. The total battery assembled by matching the sodium metal negative electrode with the sodium vanadium phosphate positive electrode has higher initial capacity, smaller polarization and better capacity stability.

The invention discloses a preparation method of water vapor modified chemical capacitance carbon, which comprises the following steps: (1) taking an intermediate of current commercial chemical capacitance carbon, namely activated carbon which is not calcined at a high temperature, as a carbon material, putting the carbon material into a corundum boat, and putting the corundum boat into a tubular furnace; (2) introducing inert gas into the tubular furnace, heating to 250 DEG C at the heating rate of 10-15 DEG C / nim, switching the inert gas into water vapor with the flow of 0.15-0.35 L / min and the constant heating rate, continuously heating to 850-950 DEG C, and keeping the temperature for specified time; and (3) naturally cooling to 750 DEG C, switching to inert gas, continuously cooling to room temperature, and taking out to obtain the modified capacitor carbon. The capacitor carbon modified by the chemical carbon has the properties of the capacitor carbon prepared by a physical method, and the capacitor assembled by the carbon is resistant to high temperature and stable in performance.

The present application discloses a fast-charging graphite negative electrode material and its manufacturing method and application, which belongs to the technical field of graphite negative electrode materials. The composition of the fast-charging graphite negative electrode material of the present application includes graphite with an internal complete structure and a surface topological defect structure and S2-S6 oligosulfur molecules, and the S2-S6 oligosulfur molecules are chemically bonded to the surface topological defect structure; the fast-charging graphite negative electrode material is obtained by mixing and heat-treating graphite with a sulfur source substance having an internal complete structure and a surface topological defect structure under an inert atmosphere. The fast-charging graphite negative electrode material of the present application not only maintains the inherent internal structure of graphite, so that the prepared fast-charging graphite material retains its intrinsic structure, but also the S2-S6 oligosulfur molecules chemically bonded to the graphite surface participate in the formation process of the solid electrolyte interface, which can improve the stability of the solid electrolyte interface, thereby giving the graphite negative electrode material excellent fast-charging performance and good electrochemical performance.

This application discloses a battery and its fabrication method, belonging to the field of battery technology. The battery includes: a negative electrode sheet and an electrolyte; the negative electrode sheet includes a negative current collector, a negative electrode coating layer disposed on at least one side surface of the negative current collector, and a graphene interface layer, the graphene interface layer being located between the negative current collector and the negative electrode coating layer; the electrolyte includes: a film-forming additive, the film-forming additive being selected from at least one of fluoroethylene carbonate, difluoroethylene carbonate, and vinylene carbonate. The synergistic effect of these two additives enables the battery to simultaneously achieve high initial discharge capacity, improved rate performance, and cycle stability.