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Preparation method for lithium cobalt oxide with high pole piece compaction density

A technology of compaction density, lithium cobalt oxide, applied in chemical instruments and methods, battery electrodes, cobalt compounds, etc. Simple equipment, improved compaction density and long cycle life

Active Publication Date: 2015-04-29
CAIHONG GRP ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, battery material manufacturers mainly adopt the method of reducing the central particle size of the product to increase the compaction density of the pole piece, but the reduction of the central particle size will reduce the versatility of the slurry formula, make it difficult to inject liquid into the battery cell, and reduce the number of cycles. and other shortcomings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step is the production of doped lithium cobalt oxide with small particle size.

[0026] Weigh 47.01Kg of battery-grade lithium carbonate, 100Kg of cobalt tetroxide with a particle size of 2.5-5μm, and 397.94g of titanium dioxide as a doping raw material, and use a ball mill mixer to add medium zirconia balls, including 150Kg of large balls with a diameter of 20mm and small balls with a diameter of 10mm. Ball 150Kg, ball mill rotating speed 40rpm, mixing time carried out the mixing of raw materials in 5 hours.

[0027] The mixed raw material is sintered once. The sintering system (process) is carried out according to the heating rate of 2.5°C / min, the holding temperature of 900°C, and the holding time of 14hr. After sintering, it is cooled with the furnace. The sintered product is coarsely and finely pulverized by a jaw crusher, a pair of rollers, and a jet mill, and passed through a 300-mesh sieve for use.

[0028] The second step is the production of large-g...

Embodiment 2

[0034] The first step is the production of doped lithium cobalt oxide with small particle size. Weigh 47.1Kg of battery-grade lithium carbonate, 100Kg of cobalt tetroxide with a particle size of 2.5-5μm, and 175.65g of magnesium oxide doped with a ball mill mixer. Ball 150Kg, ball mill rotating speed 40rpm, mixing time carried out the mixing of raw materials in 5 hours.

[0035] The mixed raw material is sintered once. The sintering system is carried out according to the heating rate of 2.5°C / min, the holding temperature of 890°C, and the holding time of 14hr. After sintering, it is cooled with the furnace. The sintered product is coarsely and finely pulverized by a jaw crusher, a pair of rollers, and a jet mill, and passed through a 300-mesh sieve for use.

[0036] The second step is the production of large-grained lithium cobalt oxide. Weigh 48.95Kg of battery-grade lithium carbonate, 100Kg of cobalt tetroxide with a particle size of 5-9μm, use a ball mill mixer, add mediu...

Embodiment 3

[0041] The first step is the production of doped lithium cobalt oxide with small particle size. Weigh 47.7Kg of battery-grade lithium carbonate, 100Kg of cobalt tetroxide with a particle size of 2.5-5μm, and 397.94g of titanium dioxide as a doping material, and use a ball mill mixer to add medium zirconia balls, including 150Kg of large balls with a diameter of 20mm and small balls with a diameter of 10mm 150Kg, ball mill rotating speed 40rpm, mixing time carried out the mixing of raw materials in 5 hours.

[0042] The mixed raw material is sintered once. The sintering system is carried out according to the heating rate of 2.5°C / min, the holding temperature of 900°C, and the holding time of 14hr. After sintering, it is cooled with the furnace. The sintered product is coarsely and finely pulverized by a jaw crusher, a pair of rollers, and a jet mill, and passed through a 300-mesh sieve for use.

[0043] The second step is the production of large-grained lithium cobalt oxide. ...

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Abstract

The invention relates to a preparation method for lithium cobalt oxide with high pole piece compaction density. The preparation method is characterized by comprising the following steps: (1) weighing battery grade lithium carbonate, cobaltosic oxide with the particle size of 2.5-5 mu m and a doped raw material-magnesium oxide, aluminum oxide, titanium oxide or zirconium oxide; and sintering a mixed raw material for the first time; (2) carrying out ball milling and mixing on the battery grade lithium carbonate and the cobaltosic oxide with the particle size of 2.5-5 mu m; and sintering a mixed raw material for the first time; and (3) weighing powder prepared in the steps (1) and (2) respectively, carrying out ball milling and mixing, and sintering for the second time. The preparation method has the advantages of capability of remarkably enhancing the pole piece compaction density, excellent pole piece processing performance, high commonality of a slurry formula, long cyclic life and the like, and particularly has the advantages of simple required production equipment and simplicity for change of production process conditions.

Description

technical field [0001] The invention relates to a preparation method of lithium cobaltate with high compacted density of pole pieces. Background technique [0002] Lithium cobalt oxide (LiCoO) is a cathode material for lithium-ion batteries. 2 ), is currently the most important cathode material for the commercialization of lithium-ion batteries. Lithium cobalt oxide is mainly used in the 3C market. With the improvement of people's use requirements, batteries using lithium cobalt oxide as the positive electrode material are developing in the direction of light weight and high energy density. In terms of increasing the energy density of the battery, it is a very effective method to increase the loading amount of the positive electrode material per unit volume of the battery, that is, to increase the compaction density of the lithium cobalt oxide pole piece under the same volume. [0003] At present, battery material manufacturers mainly adopt the method of reducing the centr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525C01G51/00
CPCY02E60/10
Inventor 樊波
Owner CAIHONG GRP ELECTRONICS CO LTD
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