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Lithium cobalt oxide positive-electrode target material for preparing thin-film lithium battery and preparation method thereof

A technology of lithium cobalt oxide and lithium battery, applied in the field of lithium cobalt oxide cathode target and its preparation, can solve the problem of high contact surface resistance, achieve the effects of improving performance, perfect boosting and capacity expansion, and reducing contact surface resistance

Pending Publication Date: 2022-02-18
鄂尔多斯市紫荆创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of all-solid-state batteries by magnetron sputtering coating can effectively solve the problem of high contact surface resistance. However, magnetron sputtering coating requires appropriate targets

Method used

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  • Lithium cobalt oxide positive-electrode target material for preparing thin-film lithium battery and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0037] The preparation method of lithium cobaltate positive electrode target generally can comprise the following steps:

[0038] Step A: a premixing step, mixing lithium salt powder and cobalt tetroxide powder according to a preset ratio to obtain a premixed powder, wherein the lithium salt powder is selected from the group consisting of lithium oxide, lithium carbonate and lithium nitrate.

[0039] Step B: the ball milling step, in which the premixed powder is mixed with zirconia balls with a preset particle size in a ball mill tank, and a dispersant is added, and then ball milling is carried out according to the preset first rotation speed and first duration, and then Ball milling is carried out according to the preset second rotation speed and the second duration, and then a preset weight of binder is added, and then ball milling is performed according to the preset third rotation speed and the third duration to obtain a synthetic powder.

[0040] Step C: sieving step, sie...

Embodiment 1

[0072] Using the lithium cobalt oxide positive target material prepared by the above method, a single-section graphene-based thin-film lithium battery is deposited using magnetron sputtering coating technology: a graphene collector film with a thickness of 6 μm is coated on the surface of 1 square meter of copper foil, A negative electrode film, a solid electrolyte film, a positive electrode film and a graphene collector film are sequentially deposited on the graphene collector film. Among them, the thickness of the deposited negative electrode film is 4.5 μm, the thickness of the deposited solid electrolyte film is 1.5 μm, and the thickness of the deposited positive electrode film is 15 μm. A 6 μm graphene collector film is coated on the cathode film. The obtained battery has a capacity of 12240 (mA·h) after formation.

Embodiment 2

[0074] Using the lithium cobalt oxide positive target prepared by the above method, two graphene-based thin-film lithium batteries connected in series are deposited by magnetron sputtering coating technology: a graphene collector with a thickness of 7 μm is coated on the surface of 1 square meter copper foil film, and sequentially deposit negative electrode film, solid electrolyte film, positive electrode film, graphene collector film, negative electrode film, solid electrolyte film, positive electrode film and graphene collector film on the graphene collector film. Among them, the thickness of the negative electrode film of each deposited battery is 5.5 μm, the thickness of the solid electrolyte film of each battery is 2.0 μm, the thickness of the positive electrode film of each battery is 18.5 μm, and the thickness of the graphene collector film is 7 μm. The obtained battery has a capacity of 15096 (mA·h) after formation.

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Abstract

The invention discloses a lithium cobalt oxide positive-electrode target material for preparing a thin film lithium battery and a preparation method thereof. The preparation method comprises a premixing step, a ball milling step, a sieving step, a pressing step, a sintering step and a cooling step. The lithium cobalt oxide anode target material and the preparation method thereof can be specially suitable for a scheme for preparing an all-solid-state thin film lithium battery by adopting a magnetron sputtering coating mode, and the problem that no available appropriate target material exists in the process of preparing the all-solid-state thin film lithium battery by adopting the magnetron sputtering coating mode is solved. On the basis of the lithium cobalt oxide positive-electrode target prepared by the preparation method and a magnetron sputtering coating technology, the contact surface resistance of the prepared all-solid-state film lithium battery is obviously reduced, and the performance of the battery is obviously improved.

Description

technical field [0001] The invention relates to the fields of large-scale energy storage and power energy, in particular to a lithium cobaltate positive electrode target material for preparing a thin-film lithium battery and a preparation method thereof. Background technique [0002] All-solid-state lithium battery, also known as all-solid-state lithium secondary battery, is a lithium secondary battery in which each unit of the battery, including positive and negative electrodes and electrolytes, is made of solid materials. The structure of the all-solid-state lithium battery is simpler than that of the traditional lithium-ion battery. In addition to conducting lithium ions, the solid-state electrolyte also acts as a separator. It has high mechanical strength, does not contain flammable and volatile components, has no hidden danger of leakage, and has good temperature resistance. Etc. All-solid-state lithium batteries can be made of inorganic materials, which are easy to ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/525H01M10/052
CPCC01G51/42H01M4/525H01M10/052C01P2006/40Y02E60/10
Inventor 周钧马贵龙甘志俭杨俊明
Owner 鄂尔多斯市紫荆创新研究院
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