Preparation method of high-durability kiln furniture for positive electrode material of lithium power battery

Abstract

The invention discloses a preparation method of high-durability kiln furniture for a positive electrode material of a lithium battery power battery. An inner layer and an outer layer of the kiln furniture are made of different materials respectively; a substrate layer of the outer layer and a corrosion-resistant layer of the inner layer are laminated and molded and then subjected to firing treatment; a laminating integral forming technology is adopted, so that one-time forming of the substrate layer and the corrosion-resistant layer is realized, and strong binding force, high yield and low cost of a green body are ensured; due to the design of the inner layer and the outer layer, the outer layer can be used for obtaining good heat resistance, the inner layer can also be used for obtainingstrong alkali resistance, and on the premise that the mechanical strength is not sacrificed, the kiln furniture weight and the corrosion resistance are both considered.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing high-durability kiln furniture for positive electrode materials of lithium batteries. Background technique [0002] With the further improvement of the standard of lithium battery new energy vehicles on the mileage requirements, the corresponding higher requirements are put forward for the capacity of the power battery. ring. At present, the high-nickel ternary system is the first choice for high-end power batteries, and in order to meet the maximum energy density of power batteries pursued by new energy vehicle manufacturers, the world's well-known cathode material manufacturers have compared the corresponding material systems and preparation processes of cathode materials. There is a huge improvement over the conventional power ternary, mainly in two aspects: one is that the ternary system is moving towards high nickel (such as 811 system or hi...

AI Technical Summary

Problems solved by technology

Among them, cordierite and corundum containers are the most used. By appropriately increasing the high-alumina raw materials in the sagger material, the conventional ternary system cathode material system and process can be basically met simultaneously, including the later 622 or 811 system, but with the new generation With the upgrading of the high-nickel ternary process, the traditional saggers that simply increase the aluminum content and increase the alkaline refractory raw materials are gradually unsuitable for two reasons: First, if a large amount of raw material components with high aluminum content are increased, the sagger Its own weight is too large (a sagger with a specification of 330*330*100 weighs more than 8 kg), which leads to excessive bearing pressure on the kiln sticks, resulting in a reduction in loading capacity and serious consequences of "broken rods and arched furnaces"; second, new technology Lithium hydroxide is used as the lithium source in the system, which has stronger activity and greater alkalinity, making the PH value of the ternary precursor system as high as above 13, and the corrosion of the sagger during the high-temperature firing process is extremely increased, and the content of 99% Pure alumina cannot meet the requirements of alkaline corrosion resistance

Images