46results about How to "Good fast charge and discharge capability" patented technology

The invention provides a linear porous titanium dioxide material and a preparation method and application thereof. The linear porous titanium dioxide material is of an anatase-phase structure and a monocrystalline structure, and structurally consists of a plurality of particles; each particle has the fixed growth direction. The invention also provides the preparation method and application of thelinear porous titanium dioxide material. The titanium dioxide porous nanometer line has the advantages that the long axis of the structure is suitable for the effective transfer of electrons, so as tofacilitate the hydrogenation by photolysis of water, or degradation of organic pollutants by photocatalysis; the porous structure is suitable for the quick embedding-in and embedding-out process of lithium ions, sodium ions or potassium ions; the large specific surface area is suitable for the contact area between an electrolyte and an electrode, so that the current density is reduced, and the better battery quick charge and discharge property is realized.

The invention belongs to the secondary lithium ion battery key material technical field, and provides a method for preparing a carbon-lithium titanate double-layer coated silicon negative electrode material. With chelating agents as carbon sources, a soluble Ti compound as a titanium source, a nano silicon source and various lithium compounds as lithium sources, the carbon-lithium titanate double-layer coated silicon negative electrode material is synthesized by a double-chelating-agent sol-gel method. Through combination of advantages of lithium titanate and the silicon material, a prepared lithium ion battery has high specific capacity, excellent cycling stability and quite high consistency, allows the high specific capacity and the high stability to be organically gathered together, and has wide application prospects.

The invention discloses a preparation method of a lithium ion battery adopting a lithium titanate cathode. The preparation method comprises the following steps: preparing slurry; making an anode plate and a cathode plate, and assembling into a laminated flexible packaging battery together with a diaphragm; drying and dewatering; filling ionic liquid-containing electrolyte; performing film-forming activation primarily; filling commercial lithium ion battery electrolyte; performing film-forming activation secondarily; storing at high temperature; charging and discharging; degassing; sealing to obtain the lithium ion battery. By the preparation method, a dense and stable composite SEI film with excellent performance can be easily obtained on the surface of an electrode and a swelling phenomenon of the lithium ion battery using the lithium titanate cathode in charging and discharging processes can be effectively prevented; the developed lithium ion battery has the advantages of long cycle life, excellent rapid charging and discharging capacities and high safety.

The invention relates to a method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite, belonging to the technical field of the preparation of energy storage material. The invention comprises the steps that: first, mixed solution containing graphitizing catalyst, water and alcohol is formulated, then graphite, asphalt powder and conductive agent are added therein for being mixed for several hours, the resultant mixture is dried in an atmosphere of the air, the asphalt is then pyrolyzed in an atmosphere of Aror N2, and in the end, salpeter solution is used to remove the graphitizing catalyst by means of dissolution, and the high rate lithium ion capacitor battery cathode material with pyrolyzed asphalt covering the graphite is obtained by sufficient washing and drying. The cathode material obtained according to the method has the characteristics of high capacity and good high rate performance, is simple in process flow and includes tremendous application value.

The invention provides a lithium titanate material with a linear hierarchical structure and its preparation and application. The crystal phase of the lithium titanate material is a spinel crystal phase, or a monoclinic crystal phase or their composite crystal phase; the lithium titanate material is mainly composed of a linear hierarchical structure; the linear graded The aspect ratio of the structure is greater than 10; the surface constituents of the lithium titanate material of the linear hierarchical structure are nanosheets. The long axis of the linear structure is conducive to the effective transfer of electrons, the sheet-like hierarchical structure is conducive to the rapid intercalation and intercalation of lithium ions, sodium ions or potassium ions, and the large specific surface area is conducive to the contact area between the electrolyte and the electrode, reducing The current density has better battery rapid charge and discharge performance.

An active material for batteries according to one embodiment includes a composite oxide represented by the general formula: Lix(Nb1-yTay)2+0.5zTi1-zM0.5zO7 (0≤x≤5, 0≤y≤1, 0 <z≤1). In the formula, M is at least one metal element selected from the group consisting of Sc, Y, V, Cr, Fe, Co, Mn, Al and Ga.

The invention relates to a power lithium-ion battery negative electrode material with a core-shell structure of an electric automobile and a preparation method thereof. The power lithium-ion battery negative electrode material comprises a graphite core and a shell, wherein the shell has a single-layer structure or a double-layer structure and is formed by one cladding or two cladding through a solid-phase cladding method; the shell with the single-layer structure is a hard-carbon and soft-carbon mixed carbide layer; the shell with the double-layer structure consists of an inner layer and an outer layer, the inner layer is a hard-carbon and soft-carbon mixed carbide layer, and the outer layer is a pure soft carbon carbide layer. The shell is prepared by the following steps: uniformly mixing and cladding the crushed hard-carbon and soft-carbon mixed coatings and isotropic graphite in a conical mixer, performing carbonization in an inert atmosphere, cooling, crushing and screening to obtain the shell formed by one cladding or a shell formed by two cladding. The compatibility of the graphite negative electrode material on an electrolyte solution is enhanced, and the problems that a lithium ion battery is poor in rate charge and discharge performance in high / low-temperature environments and a graphite structure is easily damaged in a charge and discharge process are solved.

The invention provides an electrode, a nonaqueous electrolyte battery, a battery pack and a vehicle. Electrodes are provided according to an embodiment. The surface composition ratio (Li+C+O) / P of the electrode measured by X-ray photoelectron spectroscopy XPS is within the range of 2 to 14.

The invention provides a three-dimensional current collector for metal lithium negative poles of primary / secondary batteries, which is composed of carbon nanotubes or a nano network with a porous structure formed by clustering and weaving of carbon nanotubes. The three-dimensional current collector used in the primary / secondary battery lithium metal negative electrode provided by the present invention refers to a three-dimensional porous structure woven into carbon nanotubes or carbon nanotube bundles, and the porous structure is used to accommodate metal lithium, which may be able to inhibit the secondary use of metal lithium. Growth of lithium dendrites in batteries, three-dimensional carbon nanotube network materials for high-capacity discharge at high current densities. The primary / secondary battery metal lithium negative electrode prepared by using the three-dimensional current collector provided by the invention has extremely high long-term cycle stability and can be charged and discharged multiple times with a very high specific capacity; at the same time, the composite negative electrode shows good fast charge and discharge capability.