2460 results about "Lithium hydroxide" patented technology

A nonaqueous electrolyte battery includes a case, a positive electrode housed in the case and including a positive electrode active material containing a lithium-nickel composite oxide and at least one of lithium hydroxide and lithium oxide, the sum of lithium hydroxide and lithium oxide falling within not less than 0.1% to not more than 0.5% by weight based on the total amount of the positive electrode active material, a negative electrode housed in the case and capable of lithium intercalation-deintercalation, and a separator sandwiched between the positive electrode and the negative electrode and impregnated with a nonaqueous electrolyte containing γ-butyrolactone.

A reaction solution to be used for image recording with an ink containing a coloring material in a dissolved or dispersed state in order to achieve a high level of image density with stability, wherein the reaction solution contains a polyvalent metal ion and an organic solvent to destabilize the dissolved or dispersed state of the coloring material in the ink in contact with the ink, has a pH of 2 or higher, and has a buffering action for pH, wherein the buffering action means it can maintain pH variation within the range of 0.5 before and after the addition of 1.0 ml of a 0.1 N aqueous lithium hydroxide solution to 50 ml of the reaction solution.

The invention generally relates to methods of selectively removing lithium from various liquids, methods of producing high purity lithium carbonate, methods of producing high purity lithium hydroxide, and methods of regenerating resin.

The invention discloses a preparation method of a spherical doped Al-Ni lithium cobalt oxide for lithium-ion battery. The preparation steps are that: first, sulfate, nitrate or chlorate of Al-Ni-Co react with strong alkali that is added with complex agent in liquid phase; the pH value, the temperature and the feeding speed of the reaction solution are controlled so as to produce a spherical precursor of Al-Ni-Co hydroxide; then the spherical precursor of Al-Ni-Co hydroxide is dried and evenly mixed with lithium hydroxide, lithium nitrate or lithium carbonate and dried; the obtained mixture is roasted into a spherical doped Al-Ni lithium cobalt oxide. The spherical doped Al-Ni lithium cobalt oxide has comparatively high tap density and remarkable cycle stability in the process of high-rate charge/discharge cycle, which improves over charge performance of Ni-Co substance and first obviously enhances charge/discharge efficiency; in addition, the preparation method of the spherical doped Al-Ni lithium cobalt oxide has the advantages of being simple, controllable and suitable for industrialized production with low energy consumption, high efficiency, short reaction time and low cost.

A method for preparing uniformly scattered nanocrystal of iron-lithium phosphate by hydrothermal synthesis includes using ferrous salt and phosphoric acid as well as lithium hydroxide as raw materials to obtain reaction pioneer matter under temperature of 40-100deg.c first, then reacting on obtained pioneer matter in high pressure reactor with temperature of 150-200deg.c under hydrothermal condition and processing obtained product by high temperature under protection of inert gas to finally obtain said uniformly scattered nanocrystal with average particle diameter of 0.2-0.5micron.

The invention relates to a preparation method of Ni-Co lithium manganate which is a cathode material for a lithium ion battery, which pertains to the field of new energy material and preparative technique. The preparation method comprises the following steps: 1. a sulfate mixture solution of nickel, cobalt and manganese is prepared in accordance with a certain concentration; 2. the mixture solution, NH3 water and a sodium hydroxide solution are continuously injected into a reactor and stirred, and a spherical or quasi-spherical multiple hydroxide A of Ni, Co and Mn is obtained after the filtration, washing and drying are conducted over the mixture; 3. the dry multiple hydroxide A of Ni, Co and Mn is presintered to obtain a spherical multiple oxide B of Ni, Co and Mn; and 4. after being added with a right quantity of alcohol, the product B is evenly mixed with lithium hydroxide and the mixture is sintered, smashed and screened to obtain a spherical LizNixCoyMnxO2 cathode material C for the lithium ion battery. With the preparation method, the particle size and distribution of the product A and product B are easy to control and the spherical Ni-Co lithium manganate C with stable quality, high density, high capacity and high discharge plateau is obtained; therefore, the preparation method is applicable to stabilizing industrial production.

An ink jet ink composition including from 40.0 to 99.0% by weight of water; from 0.1 to 20.0% by weight of a pigment dispersed with an oleoyl methyl taurine salt dispersant from 0 to 70.0% by weight of a water miscible co-solvent; and from 0.1 to 20.0% by weight of a water-reducible addition polymer; wherein the weight average molecular weight of the polymer is from 2,000 to 100,000; the acid number is from 50 to 400; and the acid group on the polymer is neutralized by an alkaline metal hydroxide such as lithium hydroxide, sodium hydroxide potassium hydroxide, or a mixture thereof; and wherein all weight percentages are based on the total weight of the ink composition. An ink jet printing method is also disclosed.

The invention relates to a dissolvent for cellulose dissolution through freezing-unfreezing method or direct dissolution method, and process for preparing the regenerated cellulose fibers and films by utilizing the dissolvent, wherein the dissolvent is the water solution of lithium hydroxide and urea whose compositions are 3.0-7.0wt% of lithium hydroxide, 4.0-30.0.0wt% of urea, the rest is water. The water solution of lithium hydroxide and urea can directly dissolve cellulose through freezing-unfreezing method or by pre-cooling the dissolvent in advance to -10 deg. C - -4 deg. C. It can be used to obtain high dissolvability transparent concentrated cellulose solution. By using the concentrated cellulose solution and through 3-5wt% diluted acid water solution coagulation, regeneration, regenerated cellulose films and fibers can be prepared.

The invention discloses a method for preparing lithium hydroxide and lithium carbonate by utilizing a soluble lithium-salt solution. The method comprises the following steps: the soluble lithium-salt solution is used as a raw material to produce the battery-level lithium hydroxide, and a lithium hydroxide solution is utilized to produce the high-purity lithium carbonate. The method is characterized in that various soluble lithium-salt solutions (the lithium solutions are expressed as LiX in the description) can be utilized, and a bipolar membrane electrodialyzer is applied to treat the soluble lithium-salt solutions, so that a higher-concentration LiOH solution and a corresponding HX acidic solution are obtained; the HX acidic solution returns to a previous-stage process for preparing the lithium salt solution; and the LiOH solution is subjected to evaporation concentration and crystallization to obtain the battery-level lithium hydroxide solid, and the produced lithium hydroxide solution can be further reacted with a carbon dioxide gas through a gas-liquid reactor, so that the high-purity lithium carbonate is obtained. The method can realize continuous stable production with low energy consumption, free pollution and large scale, and realize low-cost and high-efficiency manufacture of the battery-level lithium hydroxide and the high-purity lithium carbonate.

This invention relates to LiCoO2 doped with Zr and P, positive material of Li ionic secondary cells and its preparation method characterizing that the chemical formula is: LiZrxCo(1-x-y)PyO2, in which, it is a laminated structure, and x=0.001-0.003, y=0.02-06, the preparation steps are as folow: 1, mixing Co3O4, CoCO3 or CoC2O4 with Li2CO3 or LiOH in the atomic ratio of Li and Co(0.9801.05) :1.00, 2, baking it for 6-24h under 600-1000deg.C, 3, crushing LiCoO2 to particles of 6-15mum, 4, mixing the LiCoO2 and water 1-3times weight into pulp, 5, adding ZrNO3 and phosphate at the same time, 6, spraying and drying it, 7, baking it for 4-12h under 600-1000deg.C, 8, crushing the doped LiCoO2 to particles of 6-15mum.

The invention provides a method for preparing complex lithium grease, comprising: part of base oil is mixed with C12-C24 monobasic organic acid and at least one C4-C18 binary organic acid; the mixture is heated up to 80-120 DEG C and then added with lithium hydroxide aqueous solution for saponification reaction, and then moisture is removed; the temperature is risen to 130-180 DEG C for refining at the constant temperature, the rest base oil is added into the mixture to reduce the temperature, and the mixture is ground. The invention adopts lower refining temperature to prepare the complex lithium grease with high dropping point, so as to not only save the power resource, but also have the equivalent performances compared with the grease prepared by the prior art. Meanwhile, the method reduces the oxidation of lubricating oil when in the preparation process and improves the oxidation stability of the grease.

The invention discloses a method for synthesizing a spherical gradient lithium-rich anode material, which comprises the following steps of: adding deionized water into MnSO4 and [Ni0.4Co0.2Mn0.4](OH)2 in a molar ratio of x:1-x to form suspension, and dripping 0.025 to 0.1mol/L NaCO3 solution into the suspension in a 60 DEG C water bath to form a compact manganese carbonate precipitate layer; filtering, washing, and drying at the temperature of between 80 and 120 DEG C; and uniformly mixing precursor particles and lithium hydroxide in a molar ratio of 1:1.15-1.45, performing heat treatment in air at the temperature of between 400 and 500 DEG C for 3 to 5 hours, raising the temperature for 22 to 32 hours, and sintering at the temperature of between 750 and 900 DEG C for 12 to 15 hours. The material synthesized by the method has certain Mn concentration gradient, improves the tap density of lithium-rich materials, has high cyclical stability and specific capacity, and keeps high rate performance.

The invention discloses a high-nickel single-crystal ternary cathode material with low surface residual alkali content and a preparation method thereof. The preparation method comprises the followingsteps: weighing lithium hydroxide, an oxide additive and a nickel-cobalt-manganese ternary precursor, and carrying out uniform mixing through a dry high-speed mixing process so as to prepare a mixed material; subjecting the mixed material to first sintering so as to obtain a first sintered material; crushing the first sintered material, and carrying out sieving so as to obtain a first crushed material; weighing the first crushed material, a coating agent and deionized water, and carrying out water washing under stirring so as to prepare a slurry, wherein the coating agent comprises an elementX which is one or more selected from the group consisting of B, Al, Ba, Zr, Mg, Ca, Ti, Si, V, Sc, Nb, Ta and Z; drying the slurry under a vacuum condition through a dynamic rotary drying process so as to obtain a dry material; subjecting the dry material to secondary sintering so as to obtain a secondary sintered material; and crushing the secondary sintered material, and carrying out sieving soas to obtain a product. The high-nickel single-crystal ternary cathode material and the preparation method thereof provided by the invention has the following advantages: alkali reduction by water washing and in-situ coating by a wet process can be synchronously completed; the process is simple; high compaction density is realized; and the content of residual alkali is low.

The invention relates to a novel method for producing lithium carbonate and lithium hydroxide, which belongs to the technical field of production of lithium salts. The method comprises the following steps of: baking spodumene concentrate; preparing a lithium sulfate solution; preparing lithium carbonate mother liquor; and preparing lithium hydroxide, wherein the lithium hydroxide can also be obtained by adding barium hydroxide into the lithium carbonate mother liquor. The method has the advantages that: lime is added into a lithium carbonate sinker mother liquor to produce the lithium hydroxide by causticizing and transforming, and the production of lithium carbonate is combined with the production of the lithium hydroxide, so that a process flow is simplified, investment and production costs are lowered, a production process is more flexible to regulate and control, and the quality of a lithium carbonate product is more stable. By adopting the method, the mother liquor of lithium carbonate is easier to treat, impurities in the lithium hydroxide mother liquor are easy to treat, and the product quality is not influenced.

The invention relates to a method for preparing a LiCoxNiyMnzO2 anode material for a lithium ion battery. The method comprises the following steps that soluble salts of nickel, cobalt and manganese undergo coprecipitation to prepare composite carbonate of nickel, manganese and cobalt; then, the carbonate is reacted with lithium hydroxide; moreover, when the carbonate is converted into hydroxide, lithium is deposited on the surface of the prior particles containing nickel, cobalt and manganese in the form of lithium carbonate. In this way, even mixing of lithium and elements such as nickel, cobalt and manganese is realized to obtain a top-quality precursor for preparing the LiCoxNiyMnzO2 material; moreover, the precursor can be made into a LiCoxNiyMnzO2 product with excellent properties after twice sintering. The method has the advantages of simple and easily controlled technological process, low production cost of prepared product and stable and controllable product performance, and can be used in industrial production.

The invention discloses a method for preparing chitosan fibers, which comprises the following steps: mixing 2.0 to 6.0 weight percent of chitosan, 4.0 to 6.0 weight percent of lithium hydroxide, 0.5 to 4.0 weight percent of urea, 0.1 to 3.0 weight percent of glycerol and the balance of water, and swelling to prepare chitosan spinning solution; and spinning by a wet-process spinning method, coagulating and precipitating in a coagulating bath to form protofilaments, washing, drawing, and drying to obtain the chitosan fibers. In the invention, the spinning solution is prepared by dissolving chitosan in an alkaline solvent, the chitosan macromolecular chains exist in a high-swelling state, the arrangement of the chitosan macromolecular chains is more compact, the high instability of the chitosan in acidic solution is overcome, the hydrolysis of the chitosan macromolecular chains and the breakage of the glucosidic bonds are avoided, the oriented arrangement of the macromolecular chains is promoted, and the mechanical properties of the chitosan fibers are improved.

This invention relates to a method for preparing carbamide-lithium base grease. It is characterized by: C8-C24 organic amine and isocyanate are melted respectively in base oil, after mixing, they are reacted, and then being added with at least one kind of C10-C20 fatty acid; after the acid being melted, adding lithium hydroxide water solution and reacting, then rising temp. to 190-220 deg.C, then proceeding temp.-keeping, cooling and homogenization. In this invention, carbamide-base grease and lithium-base grease are in same single reaction caldron at same time, so simplification prepn. process, with same result as prior art prodn. process.