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

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 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.

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 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.