Preparation process for anticorrosion saggar for calcination of lithium battery cathode material

Abstract

The invention discloses a preparation process for an anticorrosion saggar for calcination of a lithium battery cathode material. The preparation process includes the steps of primary aggregate preparation, secondary aggregate preparation, matrix material preparation and saggar preparation. The steps of primary aggregate preparation and secondary aggregate preparation sequentially comprise the procedures of powder preparation, ball milling slurry preparation, slurry preparation, slurry storage, blank preparation, blank drying and blank calcination. The step of matrix material preparation sequentially includes the procedures of matrix material burdening, matrix material ball milling and matrix material screening. The step of saggar preparation sequentially includes the procedures of saggar material preparation, bundling pressing, maintenance drying and high-temperature firing. Primary aggregates, secondary aggregates and a matrix material are mixed according to the process ratio to form a saggar material. The anticorrosion saggar has the alkali-resistant and anti-corrosion functions, and pure magnesium hydrate, aluminum oxide and silicon dioxide are calcinated to obtain high-purity cordierite material aggregates; magnesium-aluminum-rich spinel powder is added for preparing the matrix material, and the saggar is small in heat expansion coefficient, high in heat impact resistance and long in service life.

Description

technical field [0001] The invention relates to the field of refractory and corrosion-resistant sagger kiln furniture technology and equipment, in particular to a process for preparing a corrosion-resistant sagger for calcined lithium battery cathode materials. Background technique [0002] With the development and popularization of electronic products, lithium battery positive electrode materials have been used unprecedentedly. The powder of lithium battery positive electrode materials must be calcined in a high-temperature kiln, and the firing must be loaded in a sagger. At this time, by carrying lithium carbonate and basic metal oxides in the sagger for high-temperature reaction, the basic oxide and the acidic oxide silica and amphoteric oxides such as mullite (3Al 2 o 3 2SiO2 2 ) undergoes a chemical reaction to produce a vitreous substance; the sagger is reused after cold and hot, and generally it will be scrapped after being used for 3-5 times. [0003] In the prior...

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Problems solved by technology

[0003] In the prior art, the sagger has two structures. One is made of a single composite material. This kind of sagger will be infiltrated and corroded by the positive electrode material of the lithium battery after use, resulting in a small amount of positive electrode material on the surface of the sagger that cannot be cleaned. , can only be buried, resulting in industrial waste; once it is buried in the ground, it will inevitably cause heavy metal pollution; the other is a double-layer structure, that is, spraying on the surface of the base layer, after a certain number of uses, the surface of the saggar The physical and chemical properties of the sprayed layer and the substrate change, and the surface of the sagger begins to peel off, which not only pollutes the positive electrode material, resulting in a relatively low yield, but also easily leads to safety accidents of subsequent lithium batteries

[0004] The disadvantages in the prior art are: due to the decomposition of lithium oxide with strong permeability and reactivity, the sagger will be corroded, resulting in peeling and pulverization of the sagger, and the service life of the sagger will be reduced; the corrosion resistance of the sagger and service life, research and development of good corrosion resistance, long-life sagger plays an important role in the production and technological progress of lithium battery cathode materials

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