8 results about "Lithium aluminate" patented technology

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.

An oxynitride ceramic material includes a Ca7-8 Al15-15.5Si17-18O56-57N5-6 material and a Li6-4La3Zr1.4Ta0.6O12 material in an amount of 10 to 80 percent by weight (wt. %) based on a total weight of the oxynitride ceramic material. The oxynitride ceramic material is crystalline and includes phases including a lanthanum zirconium oxide (La2Zr2O7) phase, a lanthanum tantalum oxynitride (LaTaON2) phase, a lithium aluminate (LiAlO2) phase, a zirconium silicate (ZrSiO2) phase, and a lithium aluminosilicate (LiAlSi3O8) phase.

This invention provides a nanoscale spinel-structured lithium aluminate, its preparation method, and its applications. The average particle size of the nanoscale spinel-structured lithium aluminate is 100-1000 nm, and the proportion of nanoscale spinel-structured lithium aluminate particles with a particle size between 200-500 nm is greater than or equal to 90%. The nanoscale spinel-structured lithium aluminate provided by this invention has a small particle size and concentrated particle size distribution, exhibiting good uniformity, which is beneficial for the application of nanoscale spinel-structured lithium aluminate. For example, it can be formed into a catalyst support through processes such as kneading and balling, thereby improving catalyst performance.

The application relates to the field of lithium ion batteries, and discloses a graphite composite negative electrode material and a preparation method thereof, a negative electrode sheet and a lithium battery. The preparation method disclosed by the application deposits silver on the surface and inside of porous graphite through a silver-ammonia reaction to improve the electronic conductivity of the graphite, coats aluminum oxide on the surface of the silver-doped graphite composite material through a liquid-phase coating method, and then sintered reacts with an inorganic lithium compound at high temperature to obtain lithium meta-aluminate, which has the characteristics of high ion conductivity. At the same time, the amorphous carbon obtained by carbonization of the carbon source can improve the electronic conductivity of the lithium meta-aluminate, so that the lithium meta-aluminate can play the characteristics of high outer-layer electronic and ion conductivity, and the fast-charging performance of the material is improved. The graphite composite negative electrode material composite disclosed by the application improves the electronic conductivity of the inner-core graphite by silver doping, improves the ion conductivity of the lithium meta-aluminate shell, and plays the synergistic effect between the two, thereby improving the fast-charging performance and cycle performance of the material.

The application selects lithium oxide, lithium vanadium phosphate, nickel cobalt lithium aluminate waste, niobium oxide and zinc borate as raw materials of the positive electrode lithium supplement agent, and the capacity retention rate and the lithium ion diffusion coefficient of the battery can be improved under the suitable ratio. Research shows that with the increase of the amount of lithium vanadium phosphate in the lithium supplement agent, the capacity retention rate and the lithium ion diffusion coefficient of the battery both show a trend of first increasing and then decreasing. Therefore, the amount of lithium vanadium phosphate should be strictly controlled in practice.

A lithium secondary battery cell, having a packaging component formed by a positive electrode current collector layer, a negative electrode current collector layer, and a plastic frame to enclose an electrochemical reaction system using a non-Newtonian fluid electrolyte formed from lithium tetrachloroaluminate as a salt and sulfur dioxide as a ligand, so as to minimize remaining space within the lithium secondary battery cell, thereby requiring volatilization of only a trace amount of the ligand to achieve a saturated vapor pressure, form a gas-liquid phase balance, and maintain normal operation of the lithium secondary battery cell; furthermore, at least any one of various material interfaces of the electrochemical reaction system has a ligand clamping region, which effectively resolves the issue of non-Newtonian fluid electrolytes generating electrolyte depletion regions. In addition, non-Newtonian fluid electrolytes will self-decompose at 120° C to 200° C to form chlorides and chloride ions, and passivate positive and negative active materials, thereby effectively resolving the problem of thermal runaway in lithium secondary battery cells.

This invention relates to the technical field of lithium battery materials, specifically to a lithium-rich lithium iron ferrite material, its preparation method, and its applications. The technical solution of this invention involves mixing talc powder, organic acid, and a soluble cobalt salt solution, heating and stirring, then drying and sintering to obtain a carbon-coated cobalt-doped powder. The doped powder, lithium source, and iron source are ball-milled and mixed, then sintered to form a powder-coated lithium iron ferrite structure. Cobalt doping enables the carbon material, talc powder, and lithium iron ferrite to bond tightly. The powder-coated lithium iron ferrite structure is then ball-milled and mixed with aluminum titanate, and heated for modification to obtain a modified lithium iron ferrite. This technical solution uses a carbon-coated cobalt-doped talc composite material to coat lithium iron ferrite, effectively improving the conductivity, stability, and lithium-ion diffusion rate of the cathode material. Residual lithium on the surface reacts with aluminum titanate to generate lithium aluminate and lithium titanate, reducing residual lithium on the surface of the lithium iron ferrite material and improving the ion conduction efficiency for lithium replenishment.

This invention relates to the field of lithium battery technology, and more particularly to a lithium-rich manganese-based cathode material, its preparation method, and a battery thereof. The lithium-rich manganese-based cathode material comprises a lithium-rich core: the lithium-rich core includes a lithium-rich manganese-based matrix and a non-metallic element-doped structure located on the surface of the lithium-rich manganese-based matrix; and a composite modification layer coating the surface of the lithium-rich core: the composite modification layer contains an oxygen-deficient transition metal oxide and an amorphous lithium salt glass phase; the transition metal element in the oxygen-deficient transition metal oxide is selected from one or more of Mo, W, V, Ti, Nb, Ce, and Zr, and the amorphous lithium salt glass phase is selected from one or more of lithium sulfate, lithium phosphate, lithium silicate, lithium borate, and lithium aluminate. The lithium-rich manganese-based cathode material provided by this invention can improve the interfacial stability and cycle performance of the material through the synergistic effect of near-surface doping and the composite modification layer.