Sol-bonded sagger for sintering of a lithium battery cathode material and preparation method thereof

A positive electrode material and lithium battery technology, which is applied in the sol-bonded lithium battery positive electrode material sintering sagger and its preparation field, can solve the problems of single phase and low thermal shock performance of the sagger, and achieve short production cycle, good chemical Stability, thermal shock resistance improvement effect

Active Publication Date: 2019-12-20
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared sagger has high strength, the thermal shock performance of the prepared sagger is low due to the single phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of described mullite sol. The raw materials and contents of the mullite sol are: 40-50wt% of aluminum nitrate; 40-45wt% of dehydrated alcohol; 8-12wt% of tetraethyl silicate; 2-50wt% of polyvinyl butyral 5wt%. According to the raw material and content of the mullite sol, first dissolve the aluminum nitrate in the absolute ethanol to obtain an aluminum nitrate solution, then add the tetraethyl silicate to the aluminum nitrate solution, Stir for 0.5-2 hours to obtain a mixed solution; then add the polyvinyl butyral to the mixed solution, adjust the pH value to 8-11, and stir for 6-10 hours in a water bath at 20-60°C to obtain Mo Come stone sol.

[0032] The corundum is more than one of tabular corundum, fused white corundum and fused brown corundum, and the Al of the corundum 2 o 3 ≥95.0wt%; the particle size of the corundum particles is greater than 1 and less than or equal to 3mm, and the particle size of the corundum fine powder is 0.044-1mm....

Embodiment 1

[0040] A sol-bonded sagger for sintering positive electrode materials of lithium batteries and a preparation method thereof.

[0041] The raw materials and contents of the sagger for sintering the positive electrode material of the lithium battery are: 20-21wt% of corundum particles, 18-20wt% of corundum fine powder, 23-25wt% of cordierite, and 23-23wt% of magnesium aluminum spinel 25wt%, silica powder 2-4wt%, and clay 5-7wt%.

[0042] The preparation method of the sagger for sintering the positive electrode material of the lithium battery is:

[0043] Step 1: Mix the corundum fine powder, the cordierite, the magnesium-aluminum spinel, the silicon micropowder and the clay, and ball mill for 1-3 hours to obtain a premix.

[0044] Step 2: Stir the corundum particles and the mullite sol accounting for 2-3.5 wt% of the raw material evenly to obtain a premixed aggregate.

[0045] Step 3: adding the premixed aggregate into the premixed material, then adding mullite sol accounting ...

Embodiment 2

[0048] A sol-bonded sagger for sintering positive electrode materials of lithium batteries and a preparation method thereof.

[0049] The raw materials and contents of the sagger for sintering the positive electrode material of the lithium battery are: 21-23wt% of corundum particles, 16-18wt% of corundum fine powder, 22-24wt% of cordierite, and 22-22wt% of magnesium aluminum spinel 24wt%, silica powder 4-6wt%, clay 6-8wt%.

[0050] The preparation method of the sagger for sintering the positive electrode material of the lithium battery is:

[0051] Step 1: Mix the corundum fine powder, the cordierite, the magnesium-aluminum spinel, the silicon micropowder and the clay, and ball mill for 1-3 hours to obtain a premix.

[0052] Step 2: Stir the corundum particles and the mullite sol accounting for 2.5-4 wt% of the raw material evenly to obtain a premixed aggregate.

[0053] Step 3: adding the premixed aggregate into the premixed material, then adding mullite sol accounting for ...

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Abstract

The invention relates to a sol-bonded sagger for sintering of a lithium battery cathode material and a preparation method thereof. According to a technical scheme, 20-25wt% of corundum particles are adopted as aggregate, 12-20wt% of corundum fine powder, 20-25wt% of cordierite, 20-25wt% of magnesia-alumina spinel, 2-10wt% of silica powder and 5-10wt% of clay are adopted as the matrix, and the aggregate and the matrix are called raw materials. The preparation method includes: carrying out ball milling on the matrix for 1-3h to obtain a premix; stirring the aggregate and a mullite sol accountingfor 2-5wt% of the raw materials uniformly to obtain premixed aggregate; and then adding the premixed aggregate into the premix, adding a mullite sol accounting for 2-5wt% of the raw materials, conducting stirring, mechanical pressing molding and drying, and carrying out heat preservation at 1300DEG C-1400DEG C for 2-4h to obtain the sol-bonded sagger for sintering of the lithium battery cathode material. The preparation method has simple in process and short production period, and the prepared product has good sintering performance, large volume density, high compressive strength, excellent thermal shock resistance and good erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of saggers for sintering positive electrode materials of lithium batteries. Specifically relates to a sol-bonded lithium battery positive electrode material sintering sagger and a preparation method thereof. Background technique [0002] As the battery with the highest energy density at present, lithium battery has attracted widespread attention, and the demand for sagger materials for firing positive electrode materials is also increasing. The industrial production method of lithium battery cathode material and its sagger for sintering is also attracting attention. [0003] During the preparation process of lithium battery positive electrode materials sintering (hereinafter referred to as saggers), the saggers are stacked and extruded, continuously loaded, transported, and demolded, and are easily damaged by external mechanical forces; Repeated entry and exit in the furnace, large temperature fluctuations...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/66C04B35/622C04B35/63
CPCC04B35/101C04B35/622C04B35/6316C04B2235/3481C04B2235/3222C04B2235/349C04B2235/3418C04B2235/3463C04B2235/77C04B2235/9607C04B2235/96C04B2235/9669
Inventor 聂建华鞠茂奇梁永和蔡曼菲张青霞
Owner WUHAN UNIV OF SCI & TECH
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