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4.40V high-voltage lithium cobalt oxide material and production method thereof

A lithium cobalt oxide, high-voltage technology, applied in circuits, electrical components, battery electrodes, etc., to achieve the effect of improving morphology and ensuring cycle performance

Active Publication Date: 2018-05-11
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a 4.40V high-voltage lithium cobalt oxide material and a preparation method thereof, aiming at solving the problem of existing lithium cobalt oxide materials.

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preparation example Construction

[0024] The preparation method of the 4.40V high-voltage lithium cobaltate material provided by the invention comprises the following steps:

[0025] S1. Select cobalt oxide A, mix with lithium source, compound containing doping elements Mg, Al, Ti, W, sinter, crush, sieve, and remove iron to obtain lithium cobalt oxide material C1.

[0026] The lithium source is a mixture of one or more of lithium carbonate, lithium hydroxide and lithium oxalate, the median particle size of cobalt oxide A is 11-20 μm, and the molar ratio of lithium-cobalt is (0.90-1.10):1 , the median particle size of the obtained lithium cobalt oxide material C1 is 13-22 μm. The compound containing doping elements Mg, Al, Ti and W is derived from one or two of oxides, hydroxides and fluorides of each element. In this step, the sintering temperature is 1000-1100° C., and the holding time is 3-12 hours.

[0027] S2. Select cobalt oxide B, mix with lithium source, compound containing doping elements Mg, Ni, Mn...

Embodiment 1

[0039] Cobalt oxide with a D50 of 15 μm is selected, and the sources of doping elements Mg, Al, Ti, and W are magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide, respectively. The molar ratio of lithium to cobalt is 1.025, and the amount of doping elements Mg-1000ppm, Al-550ppm, Ti-500ppm, W-500ppm takes cobalt oxide, lithium carbonate, magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide. After they are mixed, they are sintered in a box furnace at 1100°C for 9 hours in an air atmosphere; after the sintering is completed, the primary sintered product is crushed, iron-removed, and sieved to obtain a lithium cobalt oxide material C1 with a D50 of 20.2 μm.

[0040] Cobalt oxide with a D50 of 3 μm is selected, and the sources of doping elements Mg, Ni, and Mn are magnesium hydroxide, nickel oxide, and manganese dioxide, respectively. According to the molar ratio of lithium-cobalt being 1.0, the amount of doping elements Mg-1200ppm, Ni-700ppm...

Embodiment 2

[0045] Cobalt oxide with a D50 of 15 μm is selected, and the sources of doping elements Mg, Al, Ti, and W are magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide, respectively. The molar ratio of lithium to cobalt is 1.025, and the amount of doping elements Mg-1000ppm, Al-550ppm, Ti-500ppm, W-500ppm takes cobalt oxide, lithium carbonate, magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide. After they are mixed, they are sintered in a box furnace at 1100°C for 9 hours in an air atmosphere; after the sintering is completed, the primary sintered product is crushed, iron-removed, and sieved to obtain a lithium cobalt oxide material C1 with a D50 of 20.2 μm.

[0046] Cobalt oxide with a D50 of 3 μm is selected, and the sources of doping elements Mg, Ni, and Mn are magnesium hydroxide, nickel oxide, and manganese dioxide, respectively. According to the molar ratio of lithium-cobalt being 1.0, the amount of doping elements Mg-1200ppm, Ni-700ppm...

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Abstract

The invention is suitable for the technical field of lithium batteries and provides a 4.40V high-voltage lithium cobalt oxide material and a production method thereof. Surface coating modification iscarried out on a lithium cobalt oxide material by adopting large and small particle mixing and double-coating means; a layer of lithium-ion conductor material containing the elements, namely Ni, Mg, Al and Si can uniformly cover the surface of the lithium cobalt oxide material after sintering is completed; meanwhile, the shape and form of a coating layer are greatly improved through the introducedelement P; and the original structure of the lithium cobalt oxide material can be effectively prevented from being damaged in the charge-discharge process, so that the cycle performance of the battery is ensured. Compared with an existing coating method in the market, the method provided by the invention has the advantages that the compaction capacity and the cycle performance of the material aregreatly improved, and meanwhile, the method also plays a great improvement role in the shape and form of the surface of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a 4.40V high-voltage lithium cobalt oxide material and a preparation method thereof. Background technique [0002] 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. However, due to the poor structural stability of pure lithium cobaltate, it is easy to collapse the material structure due to the deintercalation of Li ions and the change of the valence state of Co ions during the charging and discharging process, which greatly affects the cycle life and safety of the material. hazards. To address these problems, it is generally improved by doping an appropriate amount of elements such as Mg, Al...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 徐世国宋健巍栗志涛靳亚珲丁文秀王星宁
Owner GEM JIANGSU COBALT IND CO LTD
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