10results about How to "Improve initial discharge capacity" patented technology

The present invention relates to a positive electrode material for a sodium ion battery, a method for preparing the same, a positive electrode composition comprising the same, a sodium ion secondary battery comprising the positive electrode composition, and a use of the sodium ion secondary battery. The positive electrode material comprises a layered oxide inner core and a layered oxide coating layer formed on the inner core, the positive electrode material has the following composition on the whole: Na1 + 2xNiu + x (1 + y) Cox (1-y) M1-uO2 + delta, the coating layer is represented by the following formula: Na2Ni1 + yCo1-yA alphaO4 + beta, the molar ratio of the coating layer to the inner core is x, x = 0.01-0.03, u = 0.40-0.49, y =-0.10-0.10, and the sum of the molar ratio of the coating layer to the inner core is 1: 1. M is at least two elements selected from the group consisting of metal elements Cu, Fe, Mn, Ti, Mg, Zn, Li, Al, Ca, Zr, Ta, Mo, W, La, Sr, Sb, Ce, Nb, Sn, and Y and includes Cu and Mn, delta =-0.4 to 0.4, A is a part or all of the element selected from the M element, 0 < alpha < 1, and 0 < beta < 2. The positive electrode material has excellent cycle performance.

The invention relates to a cobalt-free ultra-high nickel positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: ball-milling and mixing a nickel source, a lithium source and a dopant to obtain powder, and drying and sintering the obtained powder to obtain the cobalt-free ultra-high nickel positive electrode material, the doping agent comprises an aluminum-containing doping agent and a manganese-containing doping agent; the nickel source, the lithium source and the doping agent are mixed according to the molar ratio of the nickel element to the lithium element to the total doping element being (0.90-0.98): (1.03-1.06): (0.02-0.10). The Al and Mn elements are uniformly doped in the positive electrode material substrate through a solid-phase reaction method, the material performance is synergistically improved by utilizing the unique action mechanism of the doped elements, the electrochemical performance is synergistically improved on the premise of not depending on the cobalt element, and high initial discharge capacity, cycling stability and rate capability are kept in a wide voltage interval; and excellent capacity retention capability is shown in a wide multiplying power range.

The present invention proposes a lithium-ion battery positive electrode material and a preparation method and application thereof, belonging to the technical field of positive electrode materials. A Ni-Co-Mn precursor is prepared by coprecipitation, and the surface is coated with SiO 2 layer, after tannic acid modification, with UiO‑66‑NH 2 The positive electrode material of lithium ion battery prepared by the present invention improves the stability of the material, reduces the mixed arrangement of cations, improves the capacity retention rate after multiple cycles, improves the cycle stability and rate performance of the material, improves the initial discharge capacity and coulomb efficiency, and has broad application prospects.

This application discloses a solid electrolyte precursor, a solid electrolyte, and a solid lithium battery, relating to the technical field of solid electrolytes; the solid electrolyte precursor is processed to form a solid electrolyte containing thiourea structural units, the thiourea structural units containing N-H groups capable of participating in hydrogen bonding; the solid electrolyte exhibits an ionic conductivity of not less than 1.6 × 10⁻⁶ at 25°C. ‑4 S·cm ‑1 This application describes a solid electrolyte formed from a solid electrolyte precursor. The solid electrolyte contains thiourea structural units and forms a polymer network structure with modified inorganic fillers as connecting points. This improves the interfacial compatibility between inorganic and organic materials in the solid electrolyte and forms a continuous conductive path in the solid electrolyte, thereby increasing the ionic conductivity of the solid electrolyte.

The present invention relates to a novel method for producing a poly-spheroidal graphite, a poly-spheroidal graphite produced using the method, and a secondary battery comprising the poly-spheroidal graphite as an anode active material. Specifically, the present invention relates to a novel method for producing a spheroidized graphite having a small specific surface area (excellent initial efficiency and excellent high power for a secondary battery) using natural graphite, a spheroidized graphite produced using the method, and a secondary battery comprising the spheroidized graphite as an anode active material.

This invention relates to a method for preparing a composite PbO / ZnO three-dimensional porous lead-carbon battery additive, belonging to the field of lead-carbon battery technology. The invention involves pre-treating a titanium substrate by degreasing, followed by etching and activation in a nitric acid-hydrochloric acid mixture to obtain an activated titanium substrate. A three-dimensional hierarchical porous carbon, carbon black, and PVDF binder are mixed uniformly to obtain a mixture. N-pyrrolidone is added to the mixture, and the mixture is further mixed uniformly to obtain a three-dimensional hierarchical porous carbon slurry. The three-dimensional hierarchical porous carbon slurry is uniformly coated onto the surface of the activated titanium substrate and dried to obtain a carbon-based anode. Using a lead nitrate-zinc oxide mixed solution as the electroplating solution, the carbon-based anode is used as the anode, and a copper plate as the cathode. Electroplating is performed at 40–50°C with stirring for 1–2 hours. After electroplating, the anode is removed, washed with deionized water, and the electroplated layer is scraped off the titanium substrate surface and vacuum dried to obtain the composite PbO / ZnO three-dimensional porous lead-carbon battery additive. In this invention, PbO / ZnO is uniformly modified on the three-dimensional hierarchical porous carbon material, which, as a lead-carbon battery additive, can effectively inhibit the hydrogen evolution reaction.

The invention discloses a preparation method of a two-dimensional Salen-based covalent organic framework lithium-sulfur battery separator with a high electronegative group, a separator and a lithium-sulfur battery, and belongs to the technical field of batteries. The monomer 3,3'-((1E,1'E)-(ethane-1,2 diylbis(azoethylene))bis(methaneethylene))bis(4-hydroxybenzaldehyde) and the monomer 1,3,5-tris(4-aminophenyl)-1,3,5-triazine are used as a mixed solvent, 1,2-dichlorobenzene and mesitylene are used as a catalyst, and acetic acid is used as a catalyst to obtain a covalent organic framework material Salen-TAPT-COF doped with N and O atoms, which has high crystallinity and excellent stability. The slurry obtained by mixing with Ketjen black and PVDF after grinding is coated on the surface of a PP diaphragm. The obtained Salen-TAPT-COF / PP lithium-sulfur battery separator plays a vital role in the shuttling of polysulfides (Li2Sx) in lithium-sulfur batteries.

The invention relates to the technical field of electrode materials, and discloses a nickel single atom with a coordination structure and a preparation method and application of the nickel single atom with the coordination structure, and the general formula of the nickel single atom with the coordination structure is NiNxSy, wherein 3 > = x > = 1, 3 > = y > = 1; x and y are integers. The preparation method comprises the following steps: dispersing the Ni / ZIF-8 compound in a solvent in an inert gas atmosphere, mixing with a sulfur source, and pyrolyzing at 900-1200 DEG C for 1-4 hours to obtain the nickel monoatom with the coordination structure. The nickel monatomic with the coordination structure provided by the invention changes an electronic structure around a central Ni atom, so that the electron transfer capability of the nickel monatomic is enhanced, and electron transfer is promoted; and rich active sites are also provided, so that the polysulfide can be better anchored, the catalytic performance is improved, and the interaction between the nickel monatomic material with the coordination structure and the active substance sulfur and the oxidation-reduction reaction of the positive electrode of the lithium-sulfur battery are optimized.

This invention discloses a method for preparing a high-entropy sodium ferrous sulfate / carbon composite cathode material and its application in high-temperature sodium-ion batteries, belonging to the technical field of sodium-ion battery cathode materials. The general formula of the sodium ferrous sulfate / carbon composite cathode material is Na. 2.4‑ 2a Fe 1.8‑x+a M 2+ y N 3+ z (SO4)3 / C, where 2x = 2y + 3z, 0 ≤ a ≤ 0.2, 0 < x ≤ 0.2, 0.01 ≤ y ≤ 0.1, 0.01 ≤ z ≤ 0.1; M is selected from at least four of Mg, Ca, Mn, Co, Ni, Cu, Zn, and Ba, and N is selected from Al or Cr. This invention utilizes a high configurational entropy to suppress the dissolution of transition metals, structural collapse, and abnormal grain growth under high-temperature conditions, enabling the material to maintain structural integrity and performance stability during high-temperature cycling, thus possessing broad application prospects.

The invention provides a coated modified positive electrode material which comprises a positive electrode material matrix and a coating layer located on at least part of the surface of the positive electrode material matrix, and the coating layer is a composite material of La-doped MoP and carbon nanotubes. The modified positive electrode material is coated with the La-doped molybdenum phosphide and carbon nanotube composite material, so that the initial discharge capacity, the rate capability and the cycle performance of the battery can be obviously improved. The invention also provides a preparation method of the coated modified positive electrode material and a secondary battery based on the coated modified positive electrode material.