High voltage type lithium cobalt oxide and preparation method thereof

A lithium cobalt oxide, high voltage technology, applied in chemical instruments and methods, circuits, electrical components, etc., to achieve the effects of high compaction density, stable product performance, and high specific capacity

Active Publication Date: 2017-07-28
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this is still far from the theoretical gram capacity of 274mAh / g of lithium cobaltate, so the preparation method of high-voltage lithium cobaltate needs to be further improved

Method used

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  • High voltage type lithium cobalt oxide and preparation method thereof
  • High voltage type lithium cobalt oxide and preparation method thereof
  • High voltage type lithium cobalt oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the high-voltage lithium cobalt oxide provided in this embodiment 1 comprises the following steps:

[0028] Step 1. Select cobalt oxide containing doping elements with a median particle size of 15 μm, wherein the doping amount of the Al element is 3500 ppm, the doping amount of the Mg element is 1000 ppm, and the doping amount of the Ir element is 200 ppm; The molar ratio of cobalt is 1.05, and the amount of doping element is 2000ppm (the doping element is Mn). Weigh cobalt oxide, lithium carbonate and manganese dioxide, mix them by ball milling for 3 hours, place them in a roasting furnace, and place them in an air atmosphere. Roast at 1050°C for 10 hours; crush and sieve the roasted product to obtain a median particle size D 50 18μm lithium cobalt oxide material;

[0029] Step 2. Select cobalt oxide containing doping elements with a median particle size of 2 μm, wherein the doping amount of the Al element is 3500 ppm, the doping amount of th...

Embodiment 2

[0035] The preparation method of the high-voltage lithium cobalt oxide provided in this embodiment 2 comprises the following steps:

[0036]Step 1. Select cobalt oxide containing doping elements with a median particle size of 20 μm, wherein the doping amount of Al element is 2500 ppm, the doping amount of Mg element is 2000 ppm, and the doping amount of Ir element is 500 ppm; The molar ratio of cobalt is 1.05, and the amount of doping elements is 2000ppm. Weigh cobalt oxide, lithium carbonate and manganese dioxide, mix them by ball milling for 3 hours, place them in a roasting furnace, and roast them at 1050°C for 10 hours in an air atmosphere; After the product is pulverized and sieved, the median particle size D 50 22μm lithium cobalt oxide material;

[0037] Step 2. Select cobalt oxide containing doping elements with a median particle size of 8 μm, wherein the doping amount of the Al element is 3500 ppm, the doping amount of the Mg element is 1000 ppm, and the doping amoun...

Embodiment 3

[0043] The preparation method of the high-voltage type lithium cobalt oxide provided in the third embodiment comprises the following steps:

[0044] Step 1. Select the cobalt oxide with a median particle size of 20 μm doping, wherein the doping amount of the Al element is 2500 ppm, the doping amount of the Mg element is 2000 ppm, and the doping amount of the Ir element is 500 ppm; by the mole of lithium cobalt The ratio is 1.008. Weigh cobalt oxide and lithium carbonate, add 2000ppm alumina and 1000ppm trichromium tetroxide, mix them by ball milling for 5 hours, place them in a roasting furnace, and roast them at 1050°C for 18 hours in an air atmosphere; pulverize the roasted products After sieving, the median particle size D 50 22μm lithium cobalt oxide material;

[0045] Step 2. Select cobalt oxide containing doping elements with a median particle size of 8 μm, wherein the doping amount of the Al element is 2500 ppm, the doping amount of the Mg element is 1000 ppm, and the ...

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Abstract

The invention provides a high voltage type lithium cobalt oxide with a high specific capacity and a cycle performance and a preparation method thereof. The preparation method of the high voltage type lithium cobalt oxide is characterized by comprising the following steps of: S1, selecting cobalt oxide A containing a doping element M, and ball-milling and mixing, sintering and crushing the cobalt oxide A with a lithium source and a source compound of a doping element N to obtain a lithium cobalt oxide material C1; S2, selecting cobalt oxide A' containing a doping element M', and ball-milling and mixing, sintering and crushing the cobalt oxide A' with a lithium source and a source compound of a doping element N' to obtain a lithium cobalt oxide material C2; and S3, proportioning and mixing the two lithium cobalt oxide materials C1 and C2 in a weight ratio of 5: 5 to 9: 1, and adding a secondary surface doping element Z to ball-mill and mix, and then roasting and crushing the mixture to obtain the high voltage type lithium cobalt oxide.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high-voltage lithium cobalt oxide and a preparation method thereof. [0002] technical background [0003] Lithium cobalt oxide has the advantages of stable and reliable preparation process, high charge and discharge capacity, stable charge and discharge voltage, and many cycle times. It is currently a widely used cathode material for lithium-ion batteries, especially in 3C batteries. It occupies an absolute dominant position. status. [0004] In order to release more energy in a smaller space, lithium cobalt oxide is developing in the direction of high voltage and high compaction density. Studies have shown that the specific capacity of lithium cobalt oxide increases with the increase of charging voltage, but its cycle performance decreases with the increase of charging voltage. In order to overcome this bottleneck problem, the method of doping and coating lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/36H01M4/525H01M4/485H01M10/0525
CPCC01G51/42C01P2002/52C01P2002/72C01P2004/01C01P2004/61C01P2006/40H01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 许开华徐世国丁文秀栗志涛潘骅
Owner GEM JIANGSU COBALT IND CO LTD
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