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Graphene substrate and thin film lithium battery with same

A graphene and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of thin-film lithium batteries such as weak bonding, large interface resistance changes, and electrode material shedding, and achieve superior thermal stability, Low interfacial internal resistance and improved energy density

Pending Publication Date: 2022-02-15
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

Ordinary flexible plastic substrates are not conductive, not resistant to high temperatures, and have weak bonding with the positive and negative electrodes of thin-film lithium batteries
The surface of ordinary aluminum foil and copper foil is easy to oxidize, which will have an adverse effect on the bonding force between the positive and negative electrodes of the thin-film lithium battery, resulting in a large change in interface resistance, and it is easy to crack during the charging and discharging process of the battery, resulting in The electrode material falls off from the surface of aluminum foil and copper foil, completely invalidating the battery

Method used

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  • Graphene substrate and thin film lithium battery with same
  • Graphene substrate and thin film lithium battery with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Utilize the graphene substrate 120 prepared by the above method, adopt the magnetron sputtering coating technology, deposit the graphene-based thin-film lithium battery 10 of a single section: Coat the graphene substrate 120 that is 6 μ m in thickness on the copper foil surface of 1 square meter, on graphite The negative electrode film 130 , the solid electrolyte film 140 , the positive electrode film 150 and the graphene collector film 120 are sequentially deposited on the graphene substrate 120 . Wherein, the deposited negative electrode film 130 has a thickness of 4.5 μm, the deposited solid electrolyte film 140 has a thickness of 1.5 μm, and the deposited positive electrode film 150 has a thickness of 15 μm. The thickness of the graphene collector thin film 120 is 6 μm. The obtained battery has a capacity of 12240 (mA·h) after formation.

Embodiment 2

[0044] Using the graphene substrate 120 prepared by the above method, two graphene-based thin-film lithium batteries 10 connected in series are deposited by magnetron sputtering coating technology: a graphene substrate 120 with a thickness of 7 μm is coated on the surface of copper foil of 1 square meter, And sequentially deposit negative electrode film 130, solid electrolyte film 140, positive electrode film 150, graphene collector film 120, negative electrode film 130, solid electrolyte film 140, positive electrode film 150 and graphene collector film 120 on the graphene substrate 120. Among them, the thickness of the negative electrode film 130 of each deposited battery is 5.5 μm, the thickness of the solid electrolyte film 140 of each battery is 2.0 μm, the thickness of the positive electrode film 150 of each battery is 18.5 μm, and the graphene collector film of each battery The thickness of 120 is 7 μm. The obtained battery has a capacity of 15096 (mA·h) after formation....

Embodiment 3

[0046] Utilize the graphene substrate 120 prepared by the above method, adopt magnetron sputtering coating technology, deposit two graphene-based thin-film lithium batteries 10 connected in parallel: coat a graphene substrate 120 with a thickness of 7 μm on the surface of copper foil of 1 square meter, And sequentially deposit negative electrode film 130, solid electrolyte film 140, positive electrode film 150, graphene collector film 120, positive electrode film 150, solid electrolyte film 140, negative electrode film 130 and graphene collector film 120 on the graphene substrate 120. Among them, the thickness of the negative electrode film 130 of each deposited battery is 6.5 μm, the thickness of the solid electrolyte film 140 of each deposited battery is 2.5 μm, the thickness of the positive electrode film 150 of each deposited battery is 22 μm, and the thickness of each deposited battery is 22 μm. The thickness of the graphene collector thin film 120 is 7 μm. The resulting ...

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Abstract

The invention discloses a graphene substrate and a thin film lithium battery with the same. The thickness of the graphene substrate is 0.5-10 [mu]m, and the square resistance value of the graphene substrate is 0.1-2 ohm / sq. As the graphene substrate has extremely high conductivity, excellent mechanical strength and mechanical property, excellent thermal stability and super chemical stability, when the graphene substrate is applied to the thin-film lithium battery, perfect matching with a solid positive electrode material and a solid negative electrode material can be realized at the same time; therefore, the electrochemical corrosion defect of other metal collectors in the multiple charging and discharging processes of the battery can be avoided. As an excellent adhesion substrate of a solid positive electrode material and a solid negative electrode material, the graphene substrate provided by the invention can provide super-strong binding force between the positive electrode material and the negative electrode material, and does not generate any influence on normal vapor deposition of the positive electrode material, a solid electrolyte material and the negative electrode material of the thin-film lithium battery.

Description

technical field [0001] The invention relates to the fields of large-scale energy storage and power energy, in particular to a graphene substrate and a thin-film lithium battery with it. 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 achieve large-scale preparation to meet the needs of large-scale batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/38
CPCH01M10/38H01M4/663Y02E60/10Y02P70/50
Inventor 马贵龙周钧易汉平杨俊明
Owner 鄂尔多斯市紫荆创新研究院
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