CN111981856A - A non-burning sagger for sintering positive electrode material of lithium battery - Google Patents

Abstract

The invention relates to the technical field of superhard materials, in particular to a non-burning sagger for sintering positive electrode materials of lithium batteries. Including a saggar base made of mullite material and a saggar body made of cordierite material, the saggar base is provided with a groove for embedding the saggar body, and the saggar body is embedded and arranged In the groove; the saggar body includes two symmetrically arranged long-side bowl walls, two symmetrically arranged short-side bowl walls, and a bottom plate, the two long-side bowl walls, A rectangular parallelepiped structure with an open top is enclosed between the two short-side bowl walls and one of the bottom plates, and arc-shaped cooling grooves are provided on both the long-side bowl walls and the short-side bowl walls. The invention solves the problems in the prior art that the sagger is sintered and dried unevenly on the positive electrode material of the lithium battery, the drying depth is insufficient, and the corrosion resistance is poor.

Description

A non-burning sagger for sintering positive electrode material of lithium battery

technical field

The invention relates to the technical field of superhard materials, in particular to a non-burning sagger for sintering positive electrode materials of lithium batteries.

Background technique

The main constituent materials of lithium-ion batteries include electrolytes, separator materials, positive and negative electrode materials, etc. The positive electrode material occupies a large proportion (the mass ratio of positive and negative electrode materials is 3:1~4:1), because the performance of the positive electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery.

Saggar is one of the kiln furniture. In the process of firing ceramics, in order to prevent gas and harmful substances from damaging and fouling the body and glaze, the ceramics and body are placed in a container made of refractory materials for roasting. , this kind of container is called sagger, also known as box.

In the prior art, conventional saggars are used for drying the cathode material of conventional lithium batteries. The conventional saggar structure is usually a square, or circular, or oval shaped container, so that when calcining and drying the cathode material of lithium batteries, , there are problems of uneven drying, insufficient drying depth, and poor corrosion resistance.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a non-burning sagger for sintering a positive electrode material of a lithium battery with uniform drying, sufficient drying depth and strong corrosion resistance.

In order to solve the above-mentioned technical problems, the technical scheme of the present invention is: a non-fired sagger for sintering the positive electrode material of a lithium battery, comprising a saggar base made of mullite material and a saggar body made of cordierite material, The saggar base is provided with a groove for embedding the saggar body, and the saggar body is embedded in the groove; the saggar body includes two symmetrically arranged long sides of the saggar body wall, And two symmetrically arranged short-side pot body walls, and a bottom plate, two described long-side pot body walls, two described short-side pot body walls and one described bottom plate form a cuboid structure with an open top and both the long-side bowl body wall and the short-side bowl body wall are provided with arc-shaped cooling grooves.

There are several saggar bodies, and the several saggar bodies are stacked in sequence from bottom to top.

The bottom plate is provided with a "cross"-shaped groove, and the "cross"-shaped groove is integrally arranged on the bottom surface of the bottom plate.

The depth of the groove is not higher than one-fifth of the height of the saggar body.

Compared with the prior art, the beneficial effects of the present invention are:

In the present invention, by using mullite as the production material of the saggar base, the saggar base made of the mullite material has the properties of mullite, so that it not only has high strength, but also is wear-resistant and high-temperature resistant, which can improve the use of the saggar base. In addition, a groove is arranged in the base to embed the saggar body, so that the saggar body will not move during the sintering and drying process, so as to avoid the movement of the positive electrode material of the lithium battery placed in it, thus solving the problem of During the sintering process, the saggar body is easy to move due to the increase of the sintering temperature and the increase of the stress; further, the saggar body made of artificially synthesized cordierite has the characteristics of cordierite, so that it not only has the characteristics of cordierite. It has high temperature resistance and corrosion resistance, and its thermal expansion coefficient is lower, and the thermal stress generated during use is smaller, so that it is more uniform when drying the positive electrode material of lithium battery, and is matched with the arc-shaped heat sink set on the wall of the bowl. , making its use better.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the structural representation of the saggar base of the present invention;

Fig. 3 is the bottom surface structure schematic diagram of the saggar body of the present invention;

Fig. 4 is the three-dimensional structure schematic diagram of the saggar body of the present invention;

5 is a schematic view of the saggar of the present invention after being corroded;

FIG. 6 is a schematic view of a commercially available saggar after being corroded.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help the understanding of the present invention, but do not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

1-4, a non-fired sagger for sintering a positive electrode material of a lithium battery of the present invention includes a saggar base 1 made of mullite material and a saggar body 2 made of cordierite material. The saggar base 1 is provided with a groove 3 for embedding the saggar body 2, and the saggar body 2 is embedded in the groove 3; the saggar body 2 includes two symmetrically arranged long Side pot body wall 21, and two symmetrically arranged short side pot body walls 22, and a bottom plate 23, two described long side pot body walls 21, two described short side pot body walls 22 and a piece of said bottom plate A cuboid structure with an open top is formed between 23 , and arc-shaped cooling grooves 4 are provided on both the long-side pot body wall 21 and the short-side pot body wall 22 . In the present invention, in the process of making the saggar body 2, the cordierite material is added with mullite material, and the addition ratio is mixed according to the ratio of cordierite to mullite of 4:6, and then poured after mixing Forming, the thermal expansion coefficient of the saggar body 2 made in this way is relatively small, so that the sintering and drying process of the positive electrode material of the lithium battery can be improved, so that the drying is more uniform.

In order to facilitate the sintering and drying of the positive electrode material of the lithium battery, several sagger bodies 2 are provided, and the several sagger bodies 2 are sequentially stacked from bottom to top. Therefore, during the stacking process, the arc-shaped heat dissipation groove 4 provided on the wall of the saggar body 2 will play a role, that is, the saggar body 2 will not be stacked on the other saggar body 2, so that the saggar body 2 will not be damaged. It is covered by sealing, so that the temperature in the saggar body 2 is too high, which affects the drying effect.

In order to improve the service life of the present invention and prevent it from cracking during sintering, a "cross"-shaped groove 5 is provided on the bottom plate 23, and the "cross"-shaped groove 5 is integrally provided on the bottom plate 23. The bottom surface of the base plate 23 is provided with a "cross"-shaped groove 5, so that when the base plate 23 is sintered, the expansion caused by the increase in temperature will not cause the saggar body 2 to crack, which greatly improves the The service life of the saggar body 2.

In order to ensure the drying effect of the material inside the bottommost saggar body 2, the depth of the groove 3 is not higher than one-fifth of the height of the saggar body 2, so that the bottommost saggar body 2 is The drying effect of the cathode material of the internal lithium battery makes it dry more uniformly.

Specifically, in the present invention, by using mullite as the material for the base of the saggar, the base of the saggar made of mullite material has the properties of mullite, so that it not only has high strength, but also is wear-resistant and high-temperature resistant. Improve its service life, and set grooves in the base to embed the saggar body, so that the saggar body will not move during the sintering and drying process, and avoid the movement of the positive electrode material of the lithium battery placed in it. Therefore, the problem that the saggar body is easily moved due to the increase of the sintering temperature and the increase of stress during the sintering process is solved; further, the saggar body made of artificially synthesized cordierite has the characteristics of cordierite, which makes the saggar body easy to move. It not only has the properties of high temperature resistance and corrosion resistance, but also has a lower coefficient of thermal expansion and less thermal stress during use, so that it is more uniform when drying the positive electrode material of lithium batteries, and is matched with the arc set on the wall of the bowl. Shaped heat sink, making its use better.

In order to verify the corrosion resistance of the saggars of the present invention and the prior art, a comparison experiment of the corrosion resistance of the saggars purchased on the market and the present invention was carried out. According to lithium oxide: cobalt oxide, molar ratio 1:1. The test results are shown in Figures 5 and 6, and it can be seen from the figures that the corrosion resistance of the present invention is significantly better than that of the commercially available saggar.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions and alterations can be made to these embodiments, which still fall within the protection scope of the present invention.

Claims (4)

1. The utility model provides a lithium cell cathode material sintering is with not burning saggar which characterized in that: the structure comprises a sagger base (1) made of mullite material and a sagger body (2) made of cordierite material, wherein a groove (3) used for being embedded into the sagger base (2) is formed in the sagger base (1), and the sagger body (2) is embedded into the groove (3); the box pot body (2) comprises two long-edge pot body walls (21) which are symmetrically arranged, two short-edge pot body walls (22) which are symmetrically arranged, and a bottom plate (23), wherein the long-edge pot body walls (21), the short-edge pot body walls (22) and the short-edge pot body walls (22) form a cuboid structure with an opening at the top between the bottom plate (23), and arc-shaped heat dissipation grooves (4) are formed in the long-edge pot body walls (21) and the short-edge pot body walls (22).

2. The lithium battery positive electrode material sintering non-firing sagger as claimed in claim 1, wherein: the box pot bodies (2) are arranged in a plurality, and the box pot bodies (2) are sequentially stacked from bottom to top.

3. The lithium battery positive electrode material sintering non-firing sagger as claimed in claim 1, wherein: the bottom plate (23) is provided with a cross-shaped groove (5), and the cross-shaped groove (5) is integrally arranged on the bottom surface of the bottom plate (23).

4. The lithium battery positive electrode material sintering non-firing sagger as claimed in claim 1, wherein: the depth of the recess (3) is not greater than one fifth of the height of the cassette bowl (2).

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