KR-20260063378-A - SINTERING APPARATUS FOR CATHODE ACTIVE MATERIAL

KR20260063378AKR 20260063378 AKR20260063378 AKR 20260063378AKR-20260063378-A

Abstract

A calcination device for an anode active material according to the present invention comprises: a chamber provided with an internal space divided into a plurality of cells; a conveying device provided in the chamber and conveying a refractory casing assembly containing raw material powder of a lithium-based anode material from one side to the other along a conveying direction; a plurality of heaters configured to heat the internal space; and a plurality of side air supply devices that control the atmosphere of the internal space by supplying a target gas in a lateral direction perpendicular to the conveying direction to the internal space; wherein one cell may comprise a first side air supply device; a second side air supply device located above the first side air supply device; and a third side air supply device located above the second side air supply device.

Inventors

이학봉
최창민
이의태
김정민

Assignees

(주)포스코퓨처엠

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (12)

A chamber provided with an internal space divided into multiple cells; A transfer device provided in the above chamber and transferring a refractory casing assembly containing raw material powder of a lithium-based cathode material from one side to the other along the transfer direction; A plurality of heaters configured to heat the internal space; and It includes a plurality of side air supply devices that control the atmosphere of the internal space by supplying a target gas in a lateral direction perpendicular to the transfer direction to the internal space. A cell comprises a first side air supply device; a second side air supply device located above the first side air supply device; and a third side air supply device located above the second side air supply device. Calcination device for positive electrode active material.
In paragraph 1, The above-mentioned first side air supply device is located on the side of the kiln corresponding to a height range of 23 to 33% of the total height of the refractory casing assembly. Calcination device for positive electrode active material.
In paragraph 1, The second side air supply device is located on the side of the kiln corresponding to a height range of 56 to 66% of the total height of the refractory casing assembly. Calcination device for positive electrode active material.
In paragraph 1, The above-mentioned third side air supply device is located on the side of the kiln corresponding to a height range of 89 to 99% of the total height of the refractory casing assembly. Calcination device for positive electrode active material.
In paragraph 1, The above refractory assembly comprises a first refractory; a second refractory located on the first refractory; and a third refractory located on the second refractory. Calcination device for positive electrode active material.
In paragraph 5, The ratio of the total area of the windows located on the side wall of the second refractory box to the total area of the windows located on the side wall of the first refractory box is 0.75 to 1.25. Calcination device for positive electrode active material.
In paragraph 5, The total area of the window located on the side wall of the first refractory box and the total area of the window located on the side wall of the second refractory box are the same. Calcination device for positive electrode active material.
In paragraph 1, The plurality of side air supply devices are located in the 0 to 75% range from the inlet to the outlet of the kiln. Calcination device for positive electrode active material.
In paragraph 1, The average flow rate provided to one cell from the plurality of side air supply devices is 5 to 60 m³ /hr, Calcination device for positive electrode active material.
In paragraph 1, The apparatus further includes a plurality of lower air supply devices that control the atmosphere of the internal space by supplying a target gas from the bottom of the mixture to the internal space. Calcination device for positive electrode active material.
In paragraph 1, The apparatus further comprises at least one exhaust device configured to discharge gas within the internal space. Calcination device for positive electrode active material.
In Paragraph 11, The above exhaust device is located on the upper surface of the chamber, Calcination device for positive electrode active material.

Description

Sintering apparatus for cathode active material These embodiments relate to a calcination apparatus for positive electrode active materials. Driven by the recent explosive demand for electric vehicles and the need for increased driving range, the development of high-capacity, high-energy-density secondary batteries to meet these demands is actively underway worldwide. In order to improve electrochemical properties by improving the characteristics of the positive electrode active material included in the secondary battery, a method is proposed to form single particles or similar single particles with the size of the primary particles maximized by increasing the calcination temperature and performing calcination for a long time during the manufacture of lithium nickel metal oxide. However, this method requires firing at a relatively high temperature for a long time compared to conventional processes, which can lead to oxygen vacancy. As a result, crystal defects in the layered structure of the final cathode active material may occur, which can degrade electrochemical properties such as capacity and output. Therefore, there is a need to develop a calcination device for cathode active materials capable of calcining the cathode active material within a short period of time. FIG. 1 is a schematic diagram of a calcination apparatus used in a method for manufacturing a positive electrode active material according to one embodiment of the present invention, viewed from the side. Figure 2 is a schematic diagram of one cell of the firing apparatus of Figure 1 viewed from the front. FIG. 3 is a schematic diagram of a refractory armor assembly according to one embodiment of the present invention. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings. Terms such as first, second, and third are used to describe various parts, components, regions, layers, and/or sections, but are not limited thereto. These terms are used solely to distinguish one part, component, region, layer, or section from another part, component, region, layer, or section. Accordingly, the first part, component, region, layer, or section described below may be referred to as the second part, component, region, layer, or section without departing from the scope of the present invention. The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. As used in the specification, the meaning of "comprising" specifies certain characteristics, areas, integers, steps, actions, elements, and/or components, and does not exclude the presence or addition of other characteristics, areas, integers, steps, actions, elements, and/or components. When it is stated that one part is "above" or "on" another part, it may be directly above or on the other part, or other parts may be involved in between. In contrast, when it is stated that one part is "directly above" another part, no other parts are interposed in between. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined. In this specification, the term “combination(s) of these” described in the Markush-type expression means one or more mixtures or combinations selected from the group consisting of the components described in the Markush-type expression, and means including any one or more selected from the group consisting of said components. Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodime