792results about "Lithium oxides/hydroxides" patented technology

The present invention relates to a process for producing high purity lithium hydroxide monohydrate, comprising following steps: concentrating a lithium containing brine; purifying the brine to remove or to reduce the concentrations of ions other than lithium; adjusting the pH of the brine to about 10.5 to 11 to further remove cations other than lithium, if necessary; neutralizing the brine with acid; purifying the brine to reduce the total concentration of calcium and magnesium to less than 150 ppb via ion exchange; electrolyzing the brine to generate a lithium hydroxide solution containing less than 150 ppb total calcium and magnesium, with chlorine and hydrogen gas as byproducts; producing hydrochloric acid via combustion of the chlorine gas with excess hydrogen and subsequent scrubbing of the resultant gas stream with purified water, if elected to do so; and concentrating and crystallizing the lithium hydroxide solution to produce lithium hydroxide monohydrate crystals.

A method for making an active material comprises the steps of forming a slurry, spray drying the slurry to form a powdered precursor composition, and heating the powdered precursor composition at a temperature and for a time sufficient to form a reaction product. The slurry has a liquid phase and a solid phase, and contains at least an alkali metal compound and a transition metal compound. Preferably the liquid phase contains dissolved alkali metal compound, and the solid phase contains an insoluble transition metal compound, an insoluble carbonaceous material compound, or both. Electrodes and batteries are provided that contain the active materials.

A method for making a lithium mixed metal compound includes: preparing a reactant mixture that contains a metal compound, a lithium compound, and optionally, a phosphate-containing compound; and exposing the reactant mixture to an atmosphere in the presence of suspended carbon particles, and conducting a reduction to reduce oxidation state of at least one metal ion of the reactant mixture at a temperature sufficient to form a reaction product containing lithium and the reduced metal ion.

The present invention provides a ceramic material allowing a pellet having higher density and satisfactory Li ion conduction to be obtained. The ceramic material contains Li, La, Zr, Al and O and has a garnet-type or garnet-like crystal structure, the ratio of the number of moles of Li with respect to La being 2.0 or greater to 2.5 or lower.

The present invention relates to a cathode active material with whole particle concentration gradient for a lithium secondary battery, a method for preparing same, and a lithium secondary battery having same, and more specifically, to a composite cathode active material, a method for manufacturing same, and a lithium secondary battery having same, the composite cathode active material having excellent lifetime characteristics and charge/discharge characteristics through the stabilization of crystal structure as the concentration of a metal comprising the cathode active material shows concentration gradient in the whole particle, and having thermostability even in high temperatures.

The LixMn2O4 powder for cathode active material of a lithium secondary battery of the present invention is prepared by a method of comprising the steps of mixing an acetate aqueous solution using Li acetate and Mn acetate as metal precursors, and a chelating agent aqueous solution using PVB, GA, PAA or GC as a chelating agent; heating the mixed solution at 70 DIFFERENCE 90 DEG C. to form a sol; further heating the sol at 70 DIFFERENCE 90 DEG C. to form a gel precursor; calcining the produced gel precursor at 200 DIFFERENCE 900 DEG C. for 5 DIFFERENCE 30 hours under atmosphere. The cathode active material, LixMn2O4 powder for a lithium secondary battery in accordance with the present invention has a uniform particle size distribution, a high crystallinity and a pure spinel-phase, and a particle size, a specific surface area, a lattice of a cubic structure and the like can be controlled upon the preparing conditions. The present invention also provides a method of preparing LiNi1-xCoxO2 powder, which comprises the steps of providing a gel precursor using PAA as a chelating agent and hydroxide, nitrate or acetate of Li, Co and Ni as metal precursors; heating the gel precursor at 200 DIFFERENCE 900 DEG C. for 5 DIFFERENCE 30 hours to form a powder. The LixMn2O4 and LiNi1-xCoxO2 powder of the present invention can be used for a cathode active material of a lithium secondary battery such as a lithium ion battery or lithium polymer battery.

The present invention provides a powdery composite precursor, which comprises a core of a lithium transition metal oxide, and an aluminum hydroxide-based precipitate layer coated on the surface of the core, and a process to prepare the composite precursor. The preparation process comprises the formation of a water based slurry by dispersing lithium transition metal oxide powder in water, and a precipitation reaction of an aluminum salt solution with a base solution where the lithium transition metal particles act as seed particles, whereby a mechanically stable precipitate layer of homogeneous thickness can be achieved. The composite precursor can be converted into aluminum-containing, e.g., aluminum-doped, lithium transition metal oxide suitable for a cathode active material of lithium rechargeable battery by heat treatment.

The invention relates to cathode materials for Li-ion batteries in the quaternary phase diagram Li[Li_1/3Mn_2/3]O₂—LiMn_1/2Ni_1/2O₂—LiNiO₂—LiCoO₂, and having a high nickel content. Also a method to manufacture these materials is disclosed. The cathode material has a general formula Li_a((Ni_z(Ni_1/2Mn_1/2)_yCo_x)_1-kA_k)_2-aO₂, wherein x+y+z=1, 0.1≦x≦0.4, 0.36≦z≦0.50, A is a dopant, 0≦k≦0.1, and 0.95≦a≦1.05, and having a soluble base content (SBC) within 10% of the equilibrium soluble base content.

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.

In the production process of lithium hydroxide monohydrate, lithium sulfate solution and caustic soda are made to produce metathetic reaction to form mixture solution of sodium sulfate and lithium hydroxide, and sodium sulfate and lithium hydroxide monohydrate are then separated by means of the obvious difference in low temperature solubility. The production process includes the following steps: adding sodium hydroxide into lithium sulfate solution obtained through serial production steps to obtain mixture solution of sodium sulfate and lithium hydroxide; cooling to minus 10 deg.c to 5 deg.c for the crystallization and separation of sodium sulfate; heating to concentrate the separated clear liquid; crystallization and separation to obtain coarse lithium hydroxide monohydrate product; water dissolving coarse lithium hydroxide monohydrate, adding barium hydroxide to form insoluble barium sulfate, filtering, concentrating filtrate, crystallizing to separate wet lithium hydroxide monohydrate; and drying.

The invention relates to manganese department positive electrode material of a lithium secondary battery, which can combine with electrolyte solution or solid electrolyte, and negative electrode active material to form lithium secondary battery. Its characteristics are: the positive electrode material of lithium secondary battery is LiMn1-x-y NixMyO2(x is not less than 0.2 and not larger than 0.8, y is not less than 0 and not larger than 0.6, and x+y is not larger than 1.), M is chosen from Li, Mg, Co, Ni, Fe, Al, Cr. The manufacturing method for manganese department positive electrode material of the lithium secondary battery, includes preparation of usher containing Mn; decorate to the covering of usher particle containing Mn; mix with lithium salt and prepare particle; sintering and other steps. By decoration of the surface of particle to usher 6 of positive electrode containing Mn or active material itself, state of material or apparent condition of material can be changed and its capacity of powerful charge and discharge, cycle performance and thermal stability can be raised. The invention has notable advantages including low cost, capacity of powerful charge and discharge, super-long cycle performance, excellent safety, super-long circulation property and resistance to overcharge .

A cathode active material including at least two agglomerates of primary particles and a cathode and a lithium secondary battery containing the same are disclosed. In the cathode active material, a secondary particle includes a nickel-based lithium transition metal oxide, an average particle diameter of each primary particle is in a range from about 3 to about 5 µ m, and the at least one secondary particle comprises at least one selected from the group consisting of a first particle having an average particle diameter in the range from about 5 µm to about 8µm and a second particle having an average particle diameter in the range from about 10 µm to about 20 µm, and wherein a full width at half maximum of a (003) peak is in the range from about 0.120° to about 0.125° in an X-ray diffraction (XRD) spectrum analysis.

The invention provides a process for preparing battery grade lithium hydroxide monohydrate, comprising: (1) adding sodium hydroxide in lithium sulfate purification fluid and obtaining solid of Na2SO4, 10H2O and liquid of LiOH after completely dissolving and cooling, (2) obtaining liquid of LiOH after filtering and separating, (3) evaporating and concentrating the liquid of LiOH and filtering, separating and leaching the liquid of LiOH after cooling and crystallizing to obtain one-time crude product of LiOH, H2O, (4) adding deionized water in the one-time crude product of LiOH, H2O and obtaining re-dissolving solution of the one-time crude product of LiOH, H2O, (5) adding refining agent in the re-dissolving solution of the one-time crude product of LiOH, H2O and obtaining filtrate of LiOH refined liquor after filtering and separating, (6) filtering and separating the LiOH refined liquor after evaporating, concentrating, cooling and crystallizing to obtain solid of battery grade wet product of LiOH, H2O and (7) taking out the battery grade wet product of LiOH, H2O after drying to obtain battery product of LiOH, H2O. The invention is simple in production process, easy operation and perfect product quality.

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.

A process for preparing the composite oxide of Li and transition metals in order to use is as positive electrode of rechargeable Li or Li-ion battery features that the oxides, hydroxides or salts of Li and transition metal (Co, Ni and Mn) are used as raw materials, and the oxide, hydroxide or salt of Co, Ni, Mn, Cr, Al, or Mg is used as doping element, and includes mixing them with fusable salt, heating, constant-temp calcining, cooling, watshing to remove residual salt and baking. Its advantages are high reaction speed, and high specific capacity of product.

The invention relates to a high density spherical shape LiNixCoyMn(1-x-y)O2 and a preparation method thereof, and belongs to the products of chemical industry, in particular to the preparation of the high density spherical shape LiNixCoyMn(1-x-y)O2 which is mainly used for manufacturing a lithium ion battery. Firstly, a high density spherical shape nickel cobalt and manganese predecessor body is synthesized by controlling the synthetic technology, secondly, the high density spherical shape nickel cobalt and manganese predecessor body is mixed with a lithium source and then is calcined under the specified conditions, so the high density spherical shape LiNixCoyMn(1-x-y)O2 can be obtained. The LiNixCoyMn(1-x-y)O2 is a spherical shape crystal, the mean grain size is 3-20 micrometers, the loose packed density is more than or equal to 1.0g/cm<3>, and the tap density is more than or equal to 2.0g/cm<3>. The synthesized LiNixCoyMn(1-x-y)O2 is of a single spherical shape, has better tap density, and can improve the volume ration capacity of the battery. The LiNixCoyMn(1-x-y)O2 is formed by calcining the predecessor body which has a spherical shape particle, high density, and complete crystalline form structure, compared with the synthetic technology of the predecessor body, the preparation method is simple, the cost is low, and the particle size can be controlled, and the industrialization is easy.

In a lithium transition metal oxide having a layered structure, one is provided, which is particularly excellent as a positive electrode active material of a battery on board of an electric vehicle or a hybrid vehicle in particular. A lithium transition metal oxide having a layered structure is proposed, wherein the ratio of the crystallite diameter determined by Measurement Method 1 according to the Rietveld method with respect to the mean powder particle diameter (D50) determined by the laser diffraction/scattering-type particle size distribution measurement method is 0.05 to 0.20.

The disclosed Li-Mn composite oxide for positive of secondary Li cell comprises the core LiaMn2-bXbO4 and a coating layer, wherein 0. 97<=a<=1. 06, 0 <=b<=0. 5, X for other metal (except Li and Mn) or Si; the coating layer comprises one of more of Li-B composite oxide, Li-Co oxide, Li-V oxide, Al oxide, Al phosphate, Ti oxide, Cr. Oxide, Mg oxide, and Ca oxide This invention improves material performance, special the circulation performance at high temperature.

A lithium metal oxide powder for use as a cathode material in a rechargeable battery, consisting of a core material and a surface layer, the core having a layered crystal structure consisting of the elements Li, a metal M and oxygen, wherein the Li content is stoichiometrically controlled, wherein the metal M has the formula M=Co_1-aM′_a, with 0≦a≦0.05, wherein M′ is either one or more metals of the group consisting of Al, Ga and B; and the surface layer consisting of a mixture of the elements of the core material and inorganic N-based oxides, wherein N is either one or more metals of the group consisting of Mg, Ti, Fe, Cu, Ca, Ba, Y, Sn, Sb, Na, Zn, Zr and Si.

A lithium nickel manganese cobalt complex oxide powder for a lithium secondary battery positive electrode material, which is composed of a crystal structure having a layered structure, and the composition thereof is expressed by the following formula:

Li[Li_z/(2+z){(Li_xNi_(1−3x)/2Mn_(1+x)/2)_(1−y)Co_y}_2/(2+z)]O₂

• • wherein 0.01≦x≦0.15, 0≦y≦0.35, and 0.02(1−y)(1−3x)≦z≦0.15(1−y)(1−3x).