33results about How to "Reduce surface residual alkali content" patented technology

The invention belongs to the technical field of positive electrode materials for lithium-ion batteries and particularly relates to a polyaniline / polyethylene glycol-co-coated composite ternary positive electrode material. The composite ternary positive electrode material comprises a ternary positive electrode material, polyaniline and polyethylene glycol, wherein the polyaniline and the polyethylene glycol coat the surface of the ternary positive electrode material. The invention further provides a preparation method and application of the composite ternary positive electrode material. According to the composite ternary positive electrode material, the electrical property of the obtained composite ternary positive electrode material is cooperatively improved through the surface action between the ternary positive electrode material and the polyaniline and the polyethylene glycol, and the coating effect and the chemical stability are improved. Furthermore, a wet coating method is innovatively adopted, so that the process is simple; the coating effect can be further improved through component cooperation; the performance of the material is improved; and the polyaniline / polyethylene glycol-co-coated composite ternary positive electrode material has the advantages of being simple in operation and high in consistency.

The invention provides a high-nickel positive electrode material coated with a conductive polymer and a transition metal oxide and a preparation method thereof. The center layer is a spherical high-nickel ternary material, and the surface of the center layer is a cladding layer, and the cladding layers are sequentially arranged from the inside to the outside. Poly(3,4‑ethylenedioxythiophene / polystyrene sulfonate PEDOT‑PSS, MnO 2 , the three-layer structure of poly 3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, the chemical formula of the high-nickel ternary material is Li z Ni x co y mn 1‑x‑y o 2 , where 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1. The invention has higher discharge capacity, better cycle stability and rate performance, and the surface coating layer can effectively reduce the residual amount of lithium ions on the surface of the cathode material, thereby greatly inhibiting the propagation of LiF and HF during the cycle process, Thereby reducing the dissolution of transition metal ions and the formation of cycle electrode cracks.

The invention provides a treatment process for improving the stability and conductivity of a high-nickel positive electrode material, and carbon dioxide annealing treatment and carbon dioxide plasma treatment are respectively performed on the high-nickel positive electrode material obtained by sintering in an ozone atmosphere. The method can not only shorten the sintering time of materials, increase production capacity, reduce the amount of gas, and reduce costs, but also can reduce the degree of lithium-nickel mixing of high-nickel cathode materials, improve the consistency and stability of materials, and prolong the service life of batteries; After the sintering, carbon dioxide gas is continuously introduced for annealing treatment, which can react with the residual lithium hydroxide on the surface of the high-nickel cathode material, reduce the residual alkali content on the surface of the material, reduce the sensitivity of the material to air, prolong the storage time of the material, and improve the The processing performance of the material; finally, carbon dioxide plasma treatment is performed to coat a carbon layer on the surface of the material to increase the electrical conductivity of the material, thereby improving the rate performance of the material.

Belonging to the technical field of lithium ion batteries, the invention discloses a lithium ion battery cathode material and a preparation method thereof. The chemical molecular formula of the cathode material is Lix(NiaCobMnc)1-yMyO2, wherein x is greater than or equal to 0.96 and smaller than or equal to 1.04, y is greater than or equal to 0.01 and smaller than or equal to 0.06, a is greater than or equal to 0.8 and smaller than or equal to 0.9, and a+b+c=1, M has a general formula of BzM'1-z, M' is composed of one or several of the following elements: Al, Mg, Ti and Zr, and z is greater than or equal to 0.1 and smaller than or equal to 0.5. The cathode material is coated by a layer of compound containing L, B, Ni, Co and Mn, the content of B in the outermost surface of the coating layer is at least two times that of the B in the innermost layer of the coating layer. According to the invention, the high capacity cathode material is acquired from a high nickel content ternary system, additionally multielement doping is employed to stabilize the crystal structure of the material, and then by means of washing, boron element surface modification and two-step sintering process, the material surface structure can be improved, and the surface residual alkali content can be reduced to improve the interface stability. The whole technological process of the invention is simple, and is easy for large scale production.

The invention belongs to the field of positive electrode materials for lithium ion batteries, and discloses a double-modified high-nickel ternary material and a preparation method thereof. The method includes: (1) first calcining a mixture containing a high-nickel ternary precursor and a lithium salt to obtain a high-nickel ternary base material; (2) mixing the high-nickel ternary base material with nano-ZrO 2 mixed to obtain ZrO 2 Coated high nickel ternary material; (3) the ZrO 2 The coated high-nickel ternary material is subjected to a second calcination to obtain Li 2 NiZrO 4 Double-modified high-nickel ternary materials with cladding and subsurface doping of Zr. The method provided by the invention effectively reduces the surface activity of the ternary material, thereby reducing the residual alkali content on the surface of the material and improving the cycle performance of the ternary material.

The invention discloses a method for preparing a high-rate nickel cobalt lithium aluminate anode material. The method comprises the following steps: (1) preparing a nickel cobalt lithium aluminate precursor; (2) performing lithium-site doping and modifying on potassium ions; and (3) constructing a cladding layer of a lithium-containing compound. According to the method, the dispersing speed of lithium ions is effectively increased by lithium-site replacement of potassium ions, and the rate capability of a material can be improved; the lithium-containing compound layer constructed on the material surface can be used for reducing the content of alkali remained on the material surface and reduce later cell bubbling; side reaction can be effectively inhibited, and the material structure stability in the cycling process can be promoted; and the lithium-containing compound layer has high conducting performance for lithium ions, embedding and separating of lithium ions can be accelerated, the problem of poor lithium ion conductivity when conventional metal oxide is used as the cladding layer can be solved, and the cycling performance and rate performance of the material can be improved.

The invention discloses a layered positive electrode material for a lithium-ion battery. The layered positive electrode material comprises a body and a B2O3 coating layer, wherein a chemical formula of the body is Li<x>(NiCoMn<c>)<1-y>M<y>O<2>, wherein x is smaller than or equal to 1.04 and greater than or equal to 0.96, y is smaller than or equal to 0.06 and greater than or equal to 0.01, ais smaller than or equal to 0.9 and greater than or equal to 0.8, a+b+c is equal to 1, and M is selected from at least one of an Al element, a Mg element, a Ti element and a Zr element. The inventionfurther discloses a preparation method of the layered positive electrode material for the lithium-ion battery. The method comprises the following steps of mixing a nickel-cobalt manganese hydroxide,a lithium source and a nano oxide additive evenly and carrying out first sintering to obtain unmodified powder; stirring the unmodified powder and water, carrying out centrifugal separation to obtaina solid material, drying and crushing to obtain washing powder; adding LIBOB to an organic solvent for dissolving, adding the washing powder for mixing, stirring, evaporating and carrying out second sintering to obtain the layered positive electrode material for the lithium-ion battery.

The invention discloses a high-nickel positive electrode material and a preparation method thereof. The base material of the high-nickel positive electrode material is Li x (Ni a co b mn c )O 2 Type NCM ternary material, wherein 1.0≤x≤1.06, a+b+c=1, a≥0.8, characterized in that the base material is coated with a surface-modified nano-metal oxide passivation layer , the substance used in the surface modification is a low melting point inorganic salt. The base material is covered with a layer of nano-metal oxide passivation layer modified by low-melting point inorganic salt surface. In the ternary system with increased nickel content, the surface modification is completed by two annealing treatments to stabilize the high-nickel cathode material. crystal structure and reduce the residual alkali content on the surface of the material, the prepared high-nickel cathode material has high capacity and good cycle.

The invention discloses a lithium battery material additive, a lithium battery material and a preparation method thereof, belonging to the technical field of lithium batteries. The preparation method of the lithium battery material additive includes the following steps: mixing a citric acid solution with an acetate solution containing a coating element, and then adjusting the pH to 6-10 with a pH adjuster; the coating element includes Sr, Zr, B, Al and At least two of Ti; the volume ratio of the citric acid solution and the acetate solution is 1.5-2:1, the concentration of the citric acid solution is 0.08-0.12mol / L, and the concentration of the coating element in the acetate solution is 0.008 ‑0.012mol / L. By using the sol-gel method to prepare lithium battery material additives containing various coating elements, various coating elements can be uniformly mixed and have better material consistency. The surface is uniformly coated, and the surface residual alkali content of the high-nickel ternary material can also be effectively reduced.