Sagger for mullite-cordierite lithium battery cathode material and preparation method thereof

A positive electrode material, mullite technology, applied in the field of mullite-cordierite lithium battery positive electrode material sintering sagger and its preparation, can solve the problem that the sagger is difficult to recycle, has weak corrosion resistance, and is difficult to apply on a large scale and other problems, to achieve the effect of short preparation and firing time, excellent thermal shock resistance and low cost

Inactive Publication Date: 2019-09-27
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a necessary carrier for the sintering of lithium battery positive electrode materials, sagger has the advantages of good thermal shock resistance, high strength, and good corrosion resistance of lithium battery positive electrode materials. Development is of great significance. In addition, saggers are difficult to recycle at this stage, resulting in a serious waste of resources. Research on long-term use of saggers is of great significance to resource conservation.
[0003] "A kind of mullite foam ceramics and its preparation method" (CN104311117A) patent technology, using sugar, aluminum and silicon fine powder as raw materials, using foaming technology to fire at high temperature, although it has low cost and high additional value, but due to the single phase formed in the material, its thermal shock performance is low
[0004] "A kind of cordierite honeycomb ceramics and its preparation method" (CN101045629A) patent technology, with LiO 2 , talc, calcined kaolin, alumina, aluminum hydroxide and silicon micropowder are used as raw materials, and finished products are obtained through post-mixing, mud refining, extrusion, wet billet cutting, drying, dry billet cutting, firing and other processes. strength, but the cost of raw materials is too high to be applied on a large scale
[0005] "A lightweight cordierite-mullite composite ceramic material and its preparation method" (CN103922713A) patent technology, diaspore, amorphous silica, talcum powder and clay as raw materials, after stirring, molding, drying and then Fired at high temperature, although the strength and thermal shock resistance are good, but because cordierite is easy to react with the positive electrode material of lithium battery, the corrosion resistance of the material is weak and the service life is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A mullite-cordierite lithium battery cathode material sintering sagger and a preparation method thereof. The preparation method described in this embodiment is:

[0035] Step 1. Mix 30-32wt% mullite particles, 20-22wt% mullite fine powder, 33-35wt% cordierite particles, 4-7wt% dextrin and 5-7wt% Guangxi white mud Place in a mixer and stir for 1-1.2 hours to obtain Mixture A.

[0036]Step 2. Put 30-32wt% mullite fine powder, 33-35wt% magnesium-aluminum spinel fine powder and 35-36wt% andalusite fine powder in a mixer, stir for 1-1.2h, Dry at 100-110°C for 1-2 hours, grind until the particle size is ≤0.048mm, and obtain the mixture B.

[0037] Step 3: Put the mixture A in the mold first, then evenly sprinkle a layer of mixture B on the surface of the pressure head, and machine press it under the condition of 120-130MPa with the mouth of the bowl facing down, and then press it under the condition of 100-100MPa. Dry at 110°C for 20 to 24 hours, and heat at 1300 to 1325°C...

Embodiment 2

[0039] A mullite-cordierite lithium battery cathode material sintering sagger and a preparation method thereof. The preparation method described in this embodiment is:

[0040] Step 1. Mix 31-33wt% mullite particles, 21-23wt% mullite fine powder, 32-34t% cordierite particles, 4-7wt% dextrin and 5-7wt% Guangxi white mud Place in a mixer and stir for 1-1.2 hours to obtain Mixture A.

[0041] Step 2. Put 31-33wt% mullite fine powder, 32-34wt% magnesium-aluminum spinel fine powder and 35-36wt% andalusite fine powder in a mixer, stir for 1-1.2h, Dry at 100-110°C for 1-2 hours, grind until the particle size is ≤0.048mm, and obtain the mixture B.

[0042] Step 3: first place the mixture A in the mold, then evenly sprinkle a layer of mixture B on the surface of the pressure head, and machine press it under the condition of 130-140 MPa with the mouth of the bowl facing down, and then press it at 100-100 MPa. drying at 110° C. for 20 to 24 hours, and holding at 1325 to 1350° C. for 5...

Embodiment 3

[0044] A mullite-cordierite lithium battery cathode material sintering sagger and a preparation method thereof. The preparation method described in this embodiment is:

[0045] Step 1. Mix 32-34wt% mullite particles, 22-24wt% mullite fine powder, 31-33wt% cordierite particles, 4-7wt% dextrin and 5-7wt% Guangxi white mud Place in a mixer and stir for 1-1.2 hours to obtain Mixture A.

[0046] Step 2. Put 32-34wt% mullite fine powder, 31-33wt% magnesium-aluminum spinel fine powder and 35-36wt% andalusite fine powder in a mixer, stir for 1-1.2h, Dry at 100-110°C for 1-2 hours, grind until the particle size is ≤0.048mm, and obtain the mixture B.

[0047] Step 3: first place the mixture A in the mold, then evenly sprinkle a layer of mixture B on the surface of the pressure head, and machine press it under the condition of 140-150 MPa with the mouth of the bowl facing down, and then press it at 100-100 MPa. Drying at 110°C for 20-24 hours, and heat preservation at 1350-1375°C for ...

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Abstract

The invention relates to a sagger for a mullite-cordierite lithium battery cathode material and a preparation method thereof. According to the technical scheme, by weight, 30-35 of mullite particles, 20-25% of mullite fine powder, 30-35% of cordierite particles, 4-7% of dextrin and 5-7% of Guangxi white mud are mixed and stirred to obtain a mixture A; by weight, 30-35% of mullite fine powder, 30-35% of magnesium aluminate spinel fine powder and 35-36% of andalusite fine powder are stirred, dried and ground to obtain a mixture B; then, the mixture A is placed into a mold, the mixture B is uniformly sprayed on the surface of a pressure head, mechanical pressing is performed in the mode that a bowl opening faces downwards, drying is performed under the temperature of 1,300-1,400 DEG C, and the temperature is kept constant for 5-6 h to obtain the sagger for the mullite-cordierite lithium battery cathode material. The sagger is low in cost, simple in technology and high in yield; the prepared sagger for the mullite-cordierite lithium battery cathode material is high in volume density, high in compression strength, good in thermal shock resistance and good in corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of saggers for sintering positive electrode materials of lithium batteries. In particular, it relates to a mullite-cordierite lithium battery cathode material sintering sagger and a preparation method thereof. Background technique [0002] As a necessary carrier for the sintering of lithium battery positive electrode materials, sagger has the advantages of good thermal shock resistance, high strength, and good corrosion resistance of lithium battery positive electrode materials. Development is of great significance. In addition, saggers are difficult to recycle at this stage, resulting in a serious waste of resources. Research on long-term use of saggers is of great significance to resource conservation. [0003] "A kind of mullite foam ceramics and its preparation method" (CN104311117A) patent technology, using sugar, aluminum and silicon fine powder as raw materials, using foaming technology to fire at hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/18F27D5/00
CPCC04B35/18C04B35/185C04B2235/3222C04B2235/3481C04B2235/349C04B2235/77C04B2235/96C04B2235/9669F27D5/0012
Inventor 赵惠忠单峙霖张寒李述党陈建威马九宏单文春王相辉
Owner WUHAN UNIV OF SCI & TECH
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