5 results about "Zirconium doping" patented technology

The application provides a multiple modified positive electrode precursor, a preparation method of the multiple modified positive electrode precursor, a positive electrode material and a battery, and the multiple modified positive electrode precursor comprises a zirconium-doped precursor core, a zirconium-scandium co-doped precursor transition layer and a scandium-doped precursor coating layer which are sequentially coated on the surface of the zirconium-doped precursor core; the concentration of zirconium elements in the zirconium-scandium co-doped precursor transition layer decreases from the inside to the outside, and the concentration of scandium elements in the zirconium-scandium co-doped precursor transition layer increases from the inside to the outside. According to the application, zirconium and scandium are selectively and gradiently doped in the inside and the shell of the positive electrode precursor, and multiple components are synergistically used, so that the generation of micro-cracks can be inhibited from the inside, the diffusion resistance of lithium ions is reduced, surface lattice oxygen can be stabilized during high-voltage charging, oxygen release is inhibited, and the structural stability of the prepared positive electrode material in the cycle process is improved.

This invention provides a zirconium-doped sodium metaborate-coated cathode material and its preparation method. The preparation method includes the following steps: co-precipitation to prepare a zirconium-doped nickel-cobalt-manganese hydroxide precursor; mixing a lithium source with the zirconium-doped nickel-cobalt-manganese hydroxide precursor and sintering in an oxygen-containing atmosphere to obtain a zirconium-doped nickel-cobalt-manganese cathode material; dispersing the zirconium-doped nickel-cobalt-manganese cathode material in a sodium metaborate precursor solution, evaporating the solvent to allow the sodium metaborate precursor to adhere to the surface of the zirconium-doped nickel-cobalt-manganese cathode material; and heat-treating in an oxygen-containing atmosphere to obtain the zirconium-doped sodium metaborate-coated cathode material. This invention improves the electrochemical performance of the zirconium-doped sodium metaborate-coated cathode material through Zr bulk doping and sodium metaborate surface coating, and the preparation method is simple and easy to scale up for industrial production.

This invention provides a nickel-rich cathode precursor, its preparation method, and its application. The nickel-rich cathode precursor includes a core and a coating layer covering the surface of the core; the core includes a cathode precursor matrix material and boron oxide and zirconium doped into the cathode precursor matrix material; the zirconium doping amount gradually increases along the direction from the center of the core to the surface of the cathode precursor matrix material; the coating element in the coating layer includes zirconium. This invention, by directly doping boron oxide into the precursor, while simultaneously coordinating with gradient doping and coating of zirconium, significantly reduces the uneven surface stress distribution of the subsequently prepared cathode material, reduces the generation of microcracks, stabilizes the material structure, and improves safety and electrochemical performance.

This invention discloses a method for micro-oxidation and coating treatment of tungsten copper powder surface to inhibit polyoxymethylene (POM) decomposition, relating to the fields of powder metallurgy and metal powder surface modification technology. This method involves particle size classification, followed by pulsed weak oxidation and oxygen plasma doping treatments to passivate the catalytic activity of conventional tungsten copper powder. Nano-sized tungsten copper powder is then organically coated to form a formaldehyde-capturing layer. Finally, the two modified powders are compounded with a POM matrix, synergistically inhibiting POM decomposition through multiple mechanisms to obtain a stable feedstock suitable for injection molding. This invention reduces the catalytic activity of conventional tungsten copper powder through surface passivation and zirconium doping, and endows the nano-powder with formaldehyde-capturing capabilities through organic coating. The two work synergistically in the feedstock process, blocking the catalytic reaction pathway between the metal and the POM matrix while eliminating decomposition products, thus improving the processing stability of the feedstock and the product lifespan. This provides a new path for the development of high-performance tungsten copper feedstocks.

The application relates to the field of ceramic sintering, in particular to high-packing-density yttrium oxide ceramic and a preparation method thereof, and provides a yttrium oxide ceramic sintering method which can be operated under non-pressurized conditions, utilizes a trace amount of fluxing agent for doping, simultaneously utilizes zirconium tetrachloride to form a uniform zirconium doping system in a grinding process, and through a special temperature rising and falling sintering process, can realize the ceramic sintering effect with high transparency and high density without additional pressure.