6 results about "Cobalt compounds" patented technology

This invention discloses a method for synthesizing acetate-promoted amidine cobalt complexes. Specifically, when an N,N'-dialkyl-substituted amidine alkali metal salt reacts with a cobalt precursor, acetate is added as a promoter. The chelating effect of acetate regulates the reaction activity and selectivity, enabling the efficient preparation of amidine cobalt compounds. The reaction yield can reach up to 95%, with a product purity >98%. This invention features readily available raw materials, simple operation, mild reaction conditions, good selectivity for the target product, high synthesis efficiency, and convenient post-processing, making it promising for industrial applications.

This invention discloses an in-situ surface-coated LiF-coated water-resistant 4.7V lithium cobalt oxide cathode material, its preparation method, and its applications. The chemical formula of the cathode material of this invention is Li. 1‑2x‑2y Co 1‑ z Mg x Ni y Al z O2@LiF, where 0≤x≤0.05, 0≤y≤0.05, 0≤z≤0.05, and x, y, and z cannot all be 0; LiF is Li 1‑2x‑2y Co 1‑z Mg x Ni y Al z O2 material coating layer. This invention mixes lithium metal salts, cobalt compounds, and an F-containing dopant to obtain a mixture; the mixture is sintered once at a high temperature, then cooled and ground uniformly, followed by a second sintering and cooling to obtain the in-situ surface-coated water-resistant 4.7V lithium cobalt oxide material. This invention constructs a complete, continuous, and uniformly distributed hydrophobic protective layer on the surface of lithium cobalt oxide particles through in-situ coating technology, effectively blocking the corrosion of the material by electrolyte and moisture; the simultaneously formed elemental doping enhances the metal-oxygen bond binding energy, synergistically improving the bulk structural stability and jointly ensuring the long cycle life of the electrode material.

This invention relates to a highly dispersed medium-high nickel single-crystal ternary cathode material, its preparation method, and a lithium-ion battery. The medium-high nickel single-crystal ternary cathode material comprises single-crystal matrix particles, a symbiotic intermediate layer enriched at the interface of the single-crystal matrix particles, and a lithium fluorine-cobalt compound coating layer covering the surface of the symbiotic intermediate layer. The preparation method includes: mixing a nickel-cobalt-manganese hydroxide precursor, a lithium source, and a high-valence dopant, sintering, cooling, crushing, and sieving to obtain a highly dispersed primary sintered material; then mixing the obtained primary sintered material with a coating agent, sintering, crushing, and sieving to obtain the highly dispersed medium-high nickel single-crystal ternary cathode material. This invention can prevent excessive fusion at the interface of the single-crystal matrix particles, ensure that the primary sintered material is easily crushed and dissociated, avoid affecting subsequent coating processes, and avoid the wastewater problems caused by molten salt washing and the problems of short cycle life and low capacity under high voltage and high temperature due to particle interface degradation.

Electrode active material comprising (A) a core material according to general formula Li1+x1TM1−x1O2 wherein TM is a combination of Ni and at least one of Mn, Co and Al, and, optionally, at least one more metal selected from Mg, Ti, Zr, Nb, Ta, and W, and x1 is in the range of from −0.05 to 0.2, and (B) particles of cobalt compound(s) and of aluminum compound(s) and of titanium compound(s) or zirconium compound(s) wherein the molar ratio of lithium to cobalt in said particles is in the range of from zero to below 1 and wherein said particles are attached to the surface of the core material.

This invention belongs to the field of wet processing technology for copper-containing materials, and relates to a method for recovering copper and cobalt from copper-cobalt-containing materials. The method includes the following steps: S1, performing a first-stage atmospheric pressure leaching treatment on the copper-cobalt material to obtain a first-stage leachate and a first-stage leachate residue; S2, performing a second-stage pressure leaching treatment on the first-stage leachate residue to obtain a second-stage leachate and a second-stage leachate residue, wherein the second-stage leachate includes residual acid that was not completely reacted during the second-stage pressure leaching treatment; S3, returning the second-stage leachate to step S1 for a first-stage atmospheric pressure leaching treatment, and then sequentially performing neutralization, extraction, back-extraction, and electrowinning treatment on the first-stage leachate from step S3 to obtain electrowinning copper; S4, subjecting the copper extraction residue after extraction treatment to a cobalt precipitation reaction to obtain a cobalt product. This method, by returning the liquid after the second-stage pressure leaching in step S2 to step S1 for a second-stage atmospheric pressure leaching, significantly extracts metallic copper, metallic cobalt, and copper and cobalt elements from some copper-cobalt compounds from the copper-cobalt raw material.

Disclosed herein are cathode active materials including:(A) a core material according to general formula Li1+xTM1-xO2 where TM is a combination of Ni and at least two of Mn, Co and Al, and, optionally, at least one more metal selected from Mg, Ti, Zr, Nb, Ta, and W, and x is in the range of from −0.05 to +0.05, and where the nickel content is in the range of from 80 to 99 mol-% of TM,(B) particles of cobalt compound(s) in which at least some cobalt is in the oxidation state of +III, and(C) a shell including an oxide of at least one of B or W, andwhere the core material (A) is a polycrystalline material whose secondary particles are composed of primary particles, and particles of cobalt compounds (B) are enriched at the surface of said the secondary particles.