141results about How to "Higher quality than capacity" patented technology

A preparation method for a flexible graphene-modified knittable carbon nanofiber belongs to the technical field of chemical industry. The preparation method comprises the following steps: at first, graphene oxide is taken to be placed in a container filled with DMF (Dimethyl Formamide) to obtain a graphene oxide saturated solution with the brown-yellow upper layer, then, polyacrylonitrile macromolecules are dissolved in the DMF to obtain a transparent macromolecular solution, the graphene oxide saturated solution and the macromolecular solution are mixed to obtain a precursor solution, a grapheme-modified polyacrylonitrile fiber is obtained through the electrostatic spinning technology or the melt spinning technology, the drying and stabilizing are performed, and at last, the carbon nanofiber is prepared from the dried polyacrylonitrile fiber in the inert gas environment or the vacuum condition. The carbon nanofiber prepared by the method can be applicable to lithium ion batteries or electrochemical capacitors, and besides, is also applicable to the fields of the war industry and the aerospace.

The invention provides a preparation method of a manganese-based compound positive pole material for a secondary lithium ion battery. The general constitution formula of the positive pole material is Li (LixMn2-x-yMy) O4 / Az, wherein x is more than or equal to 0 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 2, and z is more than or equal to 0 and less than or equal to 0.5; and M is a doped modified element, and A is an oxide of a coating element or a phthalocyanines large-ring transition metal complex. When the positive pole material is prepared, a lithium source and an M source are added into mixing equipment containing a medium and a dispersing agent to be mixed and dried; then the mixture and a manganese source are added into the mixing equipment containing the medium and the dispersing agent to be mixed and dried; then the new mixture is roasted and then is cooled to a room temperature; and the new mixture and an A source are added into the mixing equipment containing the medium and the dispersing agent to be mixed and dried, are roasted again, are cooled to the room temperature and are mixed and crushed to obtain the manganese-based compound positive pole material. The preparation method disclosed by the invention has the advantages of simple process, low raw material cost and processing cost, simple process route, short period and low energy consumption. The produced manganese-based compound positive pole material has the advantages of high energy density, mass specific capacity, power performance, high-temperature circulating performance and high-temperature storage performance; and the capacity efficiency of the material is high at -40 DEG C.

The invention relates to a lithium ion battery high specific capacity silicon-carbon composite cathode material. The high-performance lithium ion battery silicon-carbon cathode material comprises a Si-SiOx / C / DC composite system with a specific surface area of 1-30 square meters per gram, wherein the composite system comprises C matrix, Si-SiOx compound stuck in the C matrix, carbon nanotube distributed in C matrix and Si-SiOx-C, and an organic pyrolytic carbon coating on the outermost layer. The high-performance lithium ion battery cathode material has high quality specific capacity, good cycle stability and long service life, and can be used as high energy density cell cathode material for portable mobile terminals and digital products.

The invention relates to a sodium-ion intercalated Ti3C2 MXene material and a preparation method thereof. The technical scheme includes that the preparation method includes the steps: matching materials titanium aluminum carbon powder, hydrochloric acid solution and lithium fluoride powder according to the weight ratio of (1.0-2.0):(2.0-4.0):1, performing water bath stirring in a polyethylene plastic container, and ultrasonically and centrifugally treating mixture to obtain solid I; alternately washing the solid I by the aid of deionized water and ethyl alcohol until liquid supernatant is neutral, and filtering mixture to prepare the Ti3C2 MXene material; placing the Ti3C2 MXene material into NaOH solution to perform water bath stirring, ultrasonically and centrifugally treating mixture, alternately washing the mixture by the aid of deionized water and ethyl alcohol until liquid supernatant is neutral, and performing vacuum drying to prepare the sodium-ion intercalated Ti3C2 MXene material. The preparation method has the advantages of mild preparation condition and easiness in control, and the prepared sodium-ion intercalated Ti3C2 MXene material is wide interlayer spacing and large in specific surface area and has higher mass specific capacity when being applied to lithium and sodium ion batteries.

The invention discloses an organic cathode material for a sodium ion battery capable of being repeatedly charged and discharged, and belongs to the field of batteries. According to the organic cathode material for the sodium ion battery disclosed by the invention, an active substance of the organic cathode material is para-phthalate or a mixture of different para-phthalates; the chemical composition of the para-phthalate is C8H4O4.Rx, wherein R is Li, K, Rb, Cs, Mg, Ca, Sr, Ba, Ni, Cu, Sn, Fe, Zn, Cr, Al or Mn, and x is equal to 2 / 7, 1 / 3, 2 / 5, 1 / 2, 2 / 3, 1 or 2. The organic cathode material disclosed by the invention has low reaction potential, high quality specific capacity and excellent electrochemical cycle stability, and is simple in synthetic method and good in repeatability; the production cost is reduced, the requirement of sustainable development is met, and the organic cathode material has a wide application prospect in the field of sodium ion batteries.

The invention discloses a pseudocapacitor anode based on a three-dimensional multi-level nanostructure of cobalt-nickel sulfide core shell and a preparation method of the pseudocapacitor anode. The anode comprises a foamed nickel substrate 1, cobalt-nickel sulfide nanosheets 2 positioned on the foamed nickel substrate 1 and distributed in an array manner and cobalt-nickel sulfide blades 3 connected to the two sides of the cobalt-nickel sulfide nanosheets 2 and distributed in a growing array manner, wherein the cobalt-nickel sulfide nanosheets 2 are perpendicular to the foamed nickel substrate 1; the cobalt-nickel sulfide blades 3 and the cobalt-nickel sulfide nanosheets 2 are in the opposite directions along the foamed nickel substrate 1 by 0 to 90 degrees. According to the disclosed anode structure, the cobalt-nickel sulfide nanosheet array is directly grown on the highly conductive foam nickel substrate, so that the anode has the very high electron mobility and is beneficial to realization of rapid charge and discharge; meanwhile, the cobalt-nickel sulfide blades are continuously grown on the nanosheet array in situ, so that the available active surface of an electrode can be expanded, the energy density of the electrode can be increased, and the action speed of an active material and an electrolyte can be increased.