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A kind of preparation method and sagger of lithium cobalt oxide cathode material

A cathode material, lithium cobalt oxide technology, applied in chemical instruments and methods, cobalt compounds, battery electrodes, etc., can solve problems such as rework of finished products, increased processing costs, and scrapping.

Active Publication Date: 2020-12-18
三明厦钨新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, in the current production process of lithium cobaltate, since the sintering temperature is as high as 950°C, under standard atmospheric pressure, the melting point of lithium carbonate is 618°C, the melting point of lithium hydroxide is 471°C, and the melting point of lithium nitrate is 264°C. Lithium carbonate, lithium hydroxide or lithium nitrate in the molten state will bond and corrode the sagger, and a large amount of Al and Mg impurities mixed into the finished product will cause the finished product to be reworked or even scrapped, which increases the processing cost and even reduces the product quality. metal yield

Method used

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  • A kind of preparation method and sagger of lithium cobalt oxide cathode material
  • A kind of preparation method and sagger of lithium cobalt oxide cathode material
  • A kind of preparation method and sagger of lithium cobalt oxide cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take a sagger with a mass percent content of alumina of 59.32 wt % and a mass percentage content of magnesium oxide of 15.31 wt %.

[0036] The raw materials comprising tricobalt tetroxide and lithium carbonate are uniformly mixed by a ball mill mixer to obtain a primary mixture, and the molar ratio of lithium and cobalt (Li / Co) in the primary mixture is 1.03, with reference to Table 1, in comparative example 1, the sagger The bottom is not lined with paper each time. In each test example, different types or layers of filter paper are evenly placed at the bottom of the sagger every time. The filter paper is laid flat on the bottom of the sagger without wrinkling. In Comparative Example 2 , every time the bottom of the sagger is uniformly filled with original wood pulp paper, and the original wood pulp paper is laid flat on the bottom of the sagger without wrinkling.

[0037] Afterwards, take 5Kg of the primary mixture and evenly pack it into the saggers of the above-men...

Embodiment 2

[0047] A sagger with a mass percent content of alumina of 25 wt % and a mass percentage content of magnesium oxide of 17 wt % is taken.

[0048] The raw materials comprising tricobalt tetroxide and lithium carbonate are uniformly mixed by a ball mill mixer to obtain a primary mixture, the mol ratio of lithium and cobalt (Li / Co) in the primary mixture is 1.0, with reference to Table 2, in each test example A layer of slow-moving qualitative filter paper is evenly placed on the bottom of the sagger each time, and the filter paper is laid flat on the bottom of the sagger without wrinkling.

[0049] Get the described primary mixture of 5Kg afterwards and evenly pack in the sagger of each above-mentioned test example, compact after mixing, scrape off and cut into pieces.

[0050] Put the primary mixed material in the bowl into the high-temperature roller sintering furnace for sintering. The high-temperature roller furnace includes a closed heating zone and a sintering zone. The tem...

Embodiment 3

[0059] A sagger with a mass percent content of alumina of 76 wt % and a mass percentage content of magnesium oxide of 2 wt % is taken.

[0060] The raw materials comprising tricobalt tetroxide and lithium hydroxide were uniformly mixed by a ball mill mixer to obtain a primary mixture, and the molar ratio of lithium to cobalt (Li / Co) in the primary mixture was 1.07, referring to Table 3, in each test example 1 layer of slow-moving qualitative filter paper is evenly placed on the bottom of the sagger each time, and the filter paper is laid flat on the bottom of the sagger without wrinkling. Get 5Kg primary mixed material afterwards and evenly pack in the sagger of above-mentioned each test example, compact after mixing, scrape off and cut into pieces.

[0061] Put the primary mixture in the bowl into the high-temperature roller sintering furnace for sintering. The high-temperature roller furnace includes a closed heating zone and a sintering zone. The temperature of the closed h...

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Abstract

The invention discloses a preparation method of a lithium cobaltate cathode material, and a sagger. The preparation method comprises the following steps: a) uniformly mixing raw materials containing tricobalt tetroxide and lithium compounds to obtain a primary mixture; b) laying at least one layer of filter paper on the bottom of the sagger, wherein the ash content of the filter paper is lower than 0.15%; c) loading the primary mixture into the sagger on which the filter paper is laid, compacting and flattening to obtain a saggered primary mixture; d) placing the saggered primary mixture in asintering furnace for sintering, and coarsely crushing and finely pulverizing an obtained sintering block to obtain the lithium cobaltate cathode material. The lithium cobaltate prepared according tothe preparation method provided by the invention has a low content of Mg and Al impurities; the service life of the sagger is obviously prolonged.

Description

technical field [0001] The present invention relates to a preparation method of a lithium battery cathode material, in particular to a preparation method and a sagger of a lithium cobalt oxide cathode material. Background technique [0002] The industrial method for preparing lithium cobalt oxide positive electrode materials is to use a sagger to load lithium cobalt oxide sintering raw materials and sinter them at high temperatures. The commonly used saggers include mullite and alumina. Lithium or lithium nitrate, etc. are decomposed to produce Li with strong permeability and reactivity. 2 O, Li 2 O can precipitate Si, Al or Mg plasma in mullite and alumina, destroy the microstructure of the sagger, and the sagger is eroded, resulting in damage to the refractory material on the surface of the sagger and easy bonding to the sintered product at the bottom. [0003] In addition, in the current production process of lithium cobaltate, since the sintering temperature is as high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525
CPCC01G51/42
Inventor 罗小成颜泽宇赵来安王静任罗春漳李加勤
Owner 三明厦钨新能源材料有限公司