43 results about "Lithium aluminate" patented technology

The invention discloses a long-life lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery positive electrode materials. The long-life lithium manganese iron phosphate positive electrode material comprises lithium manganese iron phosphate, a middle coating layer and a carbon coating layer, the surface of the lithium manganese iron phosphate is coated with the middle coating layer, the surface of the middle coating layer is coated with the carbon coating layer, the middle coating layer contains metal fluoride and aluminum-containing sinter, and the aluminum-containing sinter comprises aluminum oxide and lithium metaaluminate. The synergistic coating of the middle coating layer and the carbon coating layer can effectively reduce the contact between the positive electrode material and an electrolyte, inhibit the generation of surface side reactions, improve the stability of the electrode material structure, and have low manganese dissolution and excellent cycle life.

The invention discloses an in-situ polymerization gel polymer electrolyte, a preparation method thereof and a silicon-based lithium ion battery, and belongs to the technical field of solid electrolyte. Fluorine-atom-containing fluoromethacrylate is introduced into polyethylene glycol diacrylate for copolymerization modification, in-situ polymerization is carried out in the battery to form a three-dimensional network structure, and a copolymer of polyethylene glycol diacrylate (PEGDA) and fluoromethacrylate is used as a skeleton, so that liquid electrolyte can be firmly locked in a polymer matrix; a chemical integrated interface is generated in the battery curing stage, and the interface performance is improved. Compared with a liquid electrolyte, the electrolyte battery has the advantages that the cycle life is greatly prolonged and the safety is improved on the premise that the capacity is well exerted. Moreover, the positive electrode material is well compatible with various positive electrode materials such as nickel cobalt lithium manganate and nickel cobalt lithium aluminate, and a comprehensive solution for buffering volume change, stabilizing an interface and improving safety is provided for the silicon-based lithium ion battery.

This invention discloses a preform for the hot top of a crystallizer specifically for semi-continuous casting of aluminum-lithium alloys and its manufacturing method. Addressing the problems of severe interfacial reactions between existing refractory materials and molten aluminum-lithium alloys, resulting in poor forming quality of semi-continuous casting ingots, this invention employs a gradient composite structure design: lithium aluminate is introduced into the working layer to thermodynamically suppress interfacial reactions by increasing the intrinsic lithium chemical sites; the insulation layer contains β-lithium nepheline and lithium aluminate to improve the insulation performance and thermal shock resistance of the hot top. Furthermore, by using a gradient distribution of lithium compound concentrations and types, combined with a multi-stage sintering process, the interlayer bonding strength is improved. Results show that this invention not only significantly reduces the interfacial reaction between the molten aluminum-lithium alloy and the hot top during semi-continuous casting, improving the forming quality of aluminum-lithium alloy ingots, but also extends the service life of the preform.

The invention belongs to the technical field of quantum dot glass ceramics, and relates to high-modulus multiphase quantum dot glass ceramics as well as a preparation method and application thereof. The microcrystalline glass comprises eucryptite (LiAlSiO4), lithium aluminate (LiAlO2) and quantum dots (CsPbBr3), wherein the eucryptite (LiAlSiO4) and the lithium aluminate (LiAlO2) are main crystalline phases. The surface of the LiAlO2 crystal phase is coated with the LiAlSiO4 crystal phase or gaps of the LiAlO2 crystal phase are filled with the LiAlSiO4 crystal phase to form a multi-phase reinforced structure, and the CsPbBr3 quantum dot glass ceramic has excellent water stability and deformation resistance. The preparation method comprises the following steps: respectively preparing a basic glass batch and a CsPbBr3 quantum dot precursor, and carrying out melting, water quenching and grinding on the glass batch to obtain basic glass powder; the preparation method comprises the following steps: placing a quantum dot precursor at the bottom of a platinum crucible by adopting a layered loading process, then covering basic glass powder, and finally obtaining the quantum dot microcrystalline glass through melting homogenization, casting molding and controlled heat treatment. The method is simple in process and high in controllability; the obtained product is excellent in comprehensive performance and good in application prospect.

The invention discloses an electrochemical device and an electronic device, the electrochemical device comprises a positive pole piece, a negative pole piece and a non-aqueous electrolyte, the positive pole piece comprises a positive pole material layer, the negative pole piece comprises a negative pole material layer, and the negative pole material layer comprises a negative pole material; the positive electrode material layer comprises a nickel cobalt lithium manganate material and / or a nickel cobalt lithium aluminate material, the mass content of a nickel element in the positive electrode material layer is m%, and m is larger than or equal to 29 and smaller than or equal to 56.5; the negative electrode material comprises a silicon element, the mass content of the silicon element in the negative electrode material layer is e%, and e is larger than or equal to 3.5 and smaller than or equal to 60; the non-aqueous electrolyte comprises fluoroethylene carbonate and a compound shown in a formula I, based on the total mass of the non-aqueous electrolyte, the mass content of the compound shown in the formula I is a%, the mass content of fluoroethylene carbonate is b%, a is larger than or equal to 0.5 and smaller than or equal to 20, b is larger than or equal to 1 and smaller than or equal to 30, and a / b is larger than 0.2 and smaller than or equal to 4.

The present disclosure relates to a halogen-doped nickel-cobalt-lithium aluminate, a preparation method and application thereof, the method comprising the following steps: S1, mixing nickel hydroxide with an aluminum source in a first solid phase to obtain a first solid material; S2, mixing the first solid material with a cobalt source in a second solid phase, and performing a first heat treatment on the obtained mixture in a first oxygen-containing atmosphere to obtain a second solid material; S3, mixing the second solid material with a lithium source in a third solid phase, and performing a second heat treatment on the obtained mixture in a second oxygen-containing atmosphere; the cobalt source and / or the aluminum source contain halogen. The method has simple steps, is conducive to industrial scale-up implementation and batch production, and the prepared halogen-doped nickel-cobalt-lithium aluminate has relatively uniform mixing of elements; when used as a positive electrode material of a lithium ion battery, the halogen-doped nickel-cobalt-lithium aluminate has a high specific capacity and good cycle performance.

The application discloses a lithium aluminate composite saggar and a preparation method and application thereof, and belongs to the technical field of saggar, wherein the saggar comprises an inner surface working layer and an outer matrix layer from inside to outside; the thickness of the inner surface working layer is 1-3 mm; the inner surface working layer comprises the following preparation raw materials in parts by weight: synthetic lithium aluminate 5-20 parts, kaolin 2-10 parts, fused zirconium mullite 0-10 parts, zirconium oxide 0-15 parts, zirconium silicate 0-10 parts, spinel 60-80 parts, alumina 0-10 parts, organic binder 0-5 parts, and water 1-5 parts. The synthetic lithium aluminate is added in the saggar formula system, the structure is solidified during saggar firing, according to the principle of Fick's first law, the addition of lithium aluminate can slow down the alkali corrosion of the material to the saggar, effectively restrict the volume change in the positive electrode material, and effectively improve the service life of the saggar.

The invention relates to the technical field of batteries, in particular to a negative plate and a lithium ion secondary battery comprising the same. The negative plate comprises a negative active coating, the negative active coating comprises a silicon-based material, and the silicon-based material comprises silicon-carbon particles and a coating layer located on the outer surfaces of the silicon-carbon particles; the coating layer comprises a first coating layer and a second coating layer; the second coating layer at least comprises lithium metaaluminate; based on the total weight of the silicon-based material, the mass content of Al in the second coating layer is A, and the unit is ppm; a plurality of first concave parts are arranged on the surface of the negative electrode active coating on at least one side surface of the negative electrode current collector, the depth of each first concave part is H, and the unit is mu m; and the mass content A of Al in the silicon-based material and the depth H of the first concave part meet the condition that H / A is more than or equal to 0.002 and less than or equal to 0.669. According to the lithium ion secondary battery, the structural stability of the negative plate is remarkably improved, and the lithium ion secondary battery has excellent rate capability and cycle performance.

The invention relates to the technical field of lithium ion battery positive electrode materials, and discloses a modified high-nickel NCA positive electrode material and a preparation method and application thereof. The modified high-nickel NCA positive electrode material comprises an inner core, a first coating layer and a second coating layer which are sequentially arranged from inside to outside, the inner core comprises nickel cobalt lithium aluminate doped with a hafnium element; the first coating layer comprises copper oxide; and the second coating layer comprises a lithium fast ion conductor. In the modified high-nickel NCA positive electrode material provided by the invention, hafnium doping stabilizes a crystal structure from a bulk phase angle, double-layer coating synergistic effect inhibits side reaction from an interface angle, and the two layers cooperate to solve the problem of bulk phase-interface synergistic attenuation of the material, so that the positive electrode material has high capacity, long cycle life and excellent rate capability.

Method (200) for manufacturing a battery cell (10), comprising: in a vacuum or an inert atmosphere, applying (206) an etching process to remove a passivation layer from a primary surface (41, 42) of a solid electrolyte (40); subsequent application (208) of a surface coating (51, 52) to the primary surface (41, 42); and Arranging (210) the solid electrolyte (40) including the surface coating (51, 52) between an anode (20) and a cathode (30) in the battery cell (10); wherein the application (208) of the surface coating (51, 52) comprises the application of an ionically conductive coating to the primary surface (41, 42); wherein the application of the ionically conductive coating to the primary surface (41, 42) comprises the application of lithium aluminate, LiAlO2, or lithium niobate, LiNbO3, to the primary surface (41, 42); and wherein the solid electrolyte (40) is a lithium-filled garnet material.

The invention discloses lightweight low-carbon concrete and a preparation method thereof, and relates to the technical field of concrete. The coconut shell fibers are modified with the assistance of enzymolysis by utilizing triisopropanolamine, a physical adsorption layer is formed by the triisopropanolamine through microwave irradiation, then the physical adsorption layer cooperates with lithium aluminate in a concrete matrix, the condensation speed and the early strength of the concrete are improved, meanwhile, the volcanic slag is used as lightweight aggregate, and the cost is reduced. The preparation method comprises the following steps: firstly, preparing the concrete to improve the mechanical property and corrosion resistance of the concrete, then replacing part of cement with coconut shell ash, pretreating coconut shells with a calcium salt solution before the coconut shell ash is prepared to enhance the mechanical property of the concrete, and then during a calcining process, adding ammonia gas and silicon dioxide in the coconut shells to improve the mechanical property of the concrete. Meanwhile, calcium and ammonia gas react to generate calcium nitride, so that the corrosion resistance and the mechanical property of the concrete are further enhanced.

The invention discloses a lithium aluminate composite sagger and a preparation method and application thereof, and belongs to the technical field of saggers, the sagger comprises an inner surface working layer and an outer matrix layer from inside to outside; the thickness of the inner surface working layer is 1-3mm; the inner surface working layer comprises the following preparation raw materials in parts by weight: 5-20 parts of synthetic lithium aluminate, 2-10 parts of kaolin, 0-10 parts of fused zirconium mullite, 0-15 parts of zirconium oxide, 0-10 parts of zirconium silicate, 60-80 parts of spinel, 0-10 parts of aluminum oxide, 0-5 parts of an organic binder and 1-5 parts of water. The synthetic lithium aluminate is added into a sagger formula system, the structure is cured when the sagger is fired, and according to the principle of the Fick's first law, the added lithium aluminate can slow down the alkali corrosion of the material to the sagger, effectively restrict the volume change in the positive electrode material and effectively prolong the service life of the sagger.

The invention provides a lithium battery electrolyte as well as a preparation method and application thereof. The lithium battery electrolyte is prepared from the following raw materials: thionyl chloride, lithium tetrachloroaluminate, sulfur dioxide and nitrogen trifluoride. Nitrogen trifluoride is added into the electrolyte, the nitrogen trifluoride reacts with a metal lithium negative electrode to generate a lithium fluoride enriched solid electrolyte interface with high ionic conductivity on the surface of the electrode in situ, so that the lithium ion transmission efficiency is remarkably improved, and the voltage hysteresis phenomenon is effectively improved. The preparation method is simple in process and remarkable in effect, and a new solution is provided for development of high-performance lithium thionyl chloride batteries.

The invention discloses a silicon-carbon composite negative electrode material and a preparation method and application thereof. The silicon-carbon composite negative electrode material comprises an inner core and a coating layer coating the inner core, the inner core comprises one or more silicon nanowires with the pipe diameter of 2-10 nm and the pipe length of 10-20 nm, magnesium silicate is dispersed and distributed on the surface layers of the silicon nanowires, the magnesium silicate is one or two of Mg2SiO4 and MgSiO3, fast ion conductors are uniformly distributed on the surfaces of the nanowires, and the fast ion conductors are uniformly distributed on the surfaces of the nanowires. The fast ion conductor is one of lithium aluminate, lithium metaphosphate and lithium phosphate; and the coating layer is a high-conductivity outer carbon layer. The silicon-carbon composite negative electrode material provided by the invention has the advantages that the rate performance and the cycle performance of the material are improved, and the structural strength of the material is also improved.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive pole current collector and a positive pole material layer arranged on at least one surface of the positive pole current collector, the positive pole material layer comprises nickel cobalt lithium aluminate, based on the mole number of metal elements except lithium in the positive pole material layer, the molar percentage content of the aluminum element is C1%, and C1 is more than or equal to 2 and less than or equal to 20; the electrolyte comprises a first component, and the first component is at least one of lithium difluorophosphate, lithium tris (pentafluoroethyl) trifluorophosphate or lithium trifluoroacetate; based on the mass of the electrolyte, the mass percentage content of the first component is m1%, and m1 is larger than or equal to 0.2 and smaller than or equal to 6. The secondary battery provided by the invention can give consideration to high-temperature cycle performance, high-temperature storage performance and dynamic performance.