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Lithium ion battery

A lithium-ion battery and lithium-ion technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited lithium ions, unsatisfactory discharge, storage capacity and acceleration that cannot be met, and achieve the effect of improving discharge efficiency

Inactive Publication Date: 2012-03-21
宋健民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, for currently used lithium-ion batteries, since the graphite powder used in the negative electrode has only a few microns of graphite crystals, lithium ions must be detoured continuously when inserting or extracting lithium ions, resulting in extremely slow diffusion rate and insufficient charging. And the disadvantage of slow discharge
[0008] Since the current lithium-ion battery is limited by the speed of lithium ions entering and exiting the layered electrode, the storage capacity and acceleration cannot meet the greater requirements.

Method used

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Examples

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Embodiment 1

[0030] Embodiment 1-making graphene layer

[0031] The graphene layer of this embodiment is produced by a solid-state growth method, and its general production method is as follows.

[0032] First, a high-purity graphite powder layer is coated on a quartz sheet, and the quartz sheet coated with the graphite powder layer is placed in a tubular boiler with a vacuum degree of about 10 -5 Thor.

[0033] Then, the quartz sheet coated with the graphite powder layer is heat-treated at 1200° C., so that the graphite powder layer forms a graphite film. After the boiler is cooled down slowly, the graphite film coated on the quartz sheet can be torn off from the cooled quartz sheet to obtain the stacked multi-layer graphene layer of this embodiment.

[0034] Through the above-mentioned process, the graphite film with graphene multilayer structure obtained in the present embodiment is as follows: Figure 1A As shown, it includes a plurality of graphene layers 101 .

Embodiment 2

[0035] Embodiment 2-making graphene layer

[0036] The graphene layer of this embodiment is produced by a solid-state growth method, and its general production method is as follows.

[0037] First, coat high-purity graphite powder on a thin nickel sheet, and place the thin nickel sheet coated with graphite powder in a tubular boiler with a vacuum of about 10 -5 Thor. Here, thin nickel flakes act as a catalyst for converting graphite powder into graphene.

[0038] Then, at a temperature of 1200°C, the graphite powder is catalyzed by the nickel sheet to recombine into a graphene layer with a nearly continuous lattice, which is coated on both sides of the nickel sheet, and a graphite film is formed on both sides of the nickel sheet. After the boiler cools down slowly, the graphite film coated on both sides of the nickel sheet can be torn off from the cooled nickel sheet. However, in this embodiment, graphene and nickel layers are overlapped, so the graphite film with graphene ...

Embodiment 3

[0040] Embodiment 3-making graphene layer

[0041] The manufacturing method of the graphite film with graphene multilayer structure in this embodiment is the same as that in Embodiment 2, except that after the graphite film is formed, the process of removing the nickel layer is also carried out.

[0042] Here, the graphite film with nickel layers and graphene layers interlaced in Example 2 is immersed in acid (such as sulfuric acid, nitric acid, or hydrochloric acid) to dissolve the metal catalyst. After cleaning, then obtain the graphite film of the tool graphene multilayer structure of present embodiment, its structure is the graphite film structure that makes with embodiment 1 similar, also comprises a plurality of graphene layers 101, as Figure 1A shown.

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Abstract

The invention relates to a lithium ion battery. The lithium ion battery comprises an anode, a cathode and a lithium electrolyte, wherein the lithium electrolyte is contacted with the anode and the cathode; the cathode is provided with a graphene multi-layer structure; the graphene multi-layer structure comprises a plurality of two-dimensional flake graphene layers and a plurality of metal nickel layers staggered among the two-dimensional flake graphene layers; and the lithium ions are fully embedded into or separated from the space among the layers of the graphene layers.

Description

technical field [0001] The invention relates to a lithium-ion battery, especially a lithium-ion battery with a negative electrode having a graphene multilayer structure, so as to increase the discharge speed of the battery. Background technique [0002] In recent years, with the popularity of products such as mobile phones, notebook computers, camcorders, and electric vehicles, secondary batteries with charging functions have been widely used as an energy supply device. Common secondary batteries currently on the market can be mainly divided into nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and lithium-polymer batteries. [0003] Among them, the lithium ion battery is improved from the lithium metal secondary battery, and its negative electrode material is mainly carbon. During the charging process, lithium ions are intercalated in the layered structure of the negative electrode, and there is no precipitation of lithium metal, so the prob...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/133H01M4/13
CPCY02E60/122Y02E60/10
Inventor 宋健民
Owner 宋健民
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