Current collector-free battery core and preparation method thereof and lithium ion battery

A technology without current collectors and cells, applied in the field of energy storage, can solve the problems of device stay, complex preparation process and high preparation cost, and achieve the effects of improving work efficiency, good safety and compact structure

Active Publication Date: 2020-12-29
SHENZHEN JULI ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the flexible negative electrode of this invention is relatively complicated, and the tightness of the battery after assembly is not good enough
[0006] Regarding the above-mentioned development trend of lithium-ion battery cells, there is no mature technology and process in the industry to prepare products that meet the requirements. Most devices are still in the research stage, and there are still performances that can reach the actual application. Many problems need to be solved, such as less than the requirements, low energy density, high preparation cost, complicated preparation process, etc.

Method used

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  • Current collector-free battery core and preparation method thereof and lithium ion battery
  • Current collector-free battery core and preparation method thereof and lithium ion battery
  • Current collector-free battery core and preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Step 1, select the positive electrode active material lithium cobaltate, the conductive agent acetylene black and the binder polyvinylidene fluoride to mix and prepare a dry powder, spray the dry powder on the designated area of ​​the hydrophobic and easy-to-peel platform to obtain the positive electrode material layer, Thickness 150μm, surface density 400g / m 2 , specific areas such as figure 1 As shown, including the positive electrode material layer region 111 and the surrounding blank region 112;

[0095] Step 2, spray the isolation substance material above the positive electrode material layer and the surrounding blank area, specifically the ceramic dielectric material Al 2 o 3 Mix it with the binder polyvinylidene fluoride and the solvent N-methylpyrrolidone to make a slurry, spray it, and get a plane covered with isolation materials again, with a thickness of 30 μm;

[0096] Step 3: Spray the negative electrode material layer on the designated area above the pl...

Embodiment 2

[0103] A laminated lithium-ion battery cell without a current collector and its manufacturing process according to the present invention, wherein the manufacturing process of the cell is basically the same as in Embodiment 1, except for the difference in specific areas, and the specific steps are as follows:

[0104] Step 1, spraying the positive electrode material layer on the designated area of ​​the hydrophobic and easy-to-peel platform, specific areas such as Figure 4 As shown, including the positive electrode material layer region 211 and the surrounding blank region 212;

[0105] Step 2, spraying the spacer material above the positive electrode material layer and the surrounding blank area, and obtaining a plane covered with the spacer material again;

[0106] Step 3, spray the negative electrode material layer on the designated area above the plane above the above step, the specific area is as follows Figure 5 As shown, it includes the negative electrode material lay...

Embodiment 3

[0113] A laminated lithium-ion battery without a current collector in this embodiment is made of the bare cell prepared in Embodiment 1 and Embodiment 2, and the specific implementation method is as follows:

[0114] First, the cell unit comprising the positive electrode material layer, the negative electrode material layer and the separator material layer obtained in Embodiment 1 and Embodiment 2 is coated with a layer of silver paste on the cut electrode end face;

[0115] Then, the cell is soaked with the electrolyte, so that the cell isolation material layer is filled with the electrolyte;

[0116] Then, assemble the cell filled with the electrolyte and the casing of the corresponding size to obtain a lithium-ion battery.

[0117] In this embodiment, the thickness and surface density of the positive electrode material layer and the negative electrode material layer are the same as those in Embodiment 1.

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Abstract

The invention discloses a current collector-free battery core and a preparation method thereof and a lithium ion battery. The method comprises the following steps: 1) preparing a first material area and a first polar material layer in a first blank area on one side of the first material area; 2) forming a first isolation material layer on the first polar material layer and the first blank area; 3)preparing a second polar material layer opposite to the first polar material layer in structure on the first isolation material layer, wherein the second polar material layer comprises a second material area and a second blank area which is positioned on one side of the second material area and is opposite to the first blank area, and the first material area and the second material area are partially overlapped in the horizontal projection direction; 4) forming a second isolation material layer in the second blank area, wherein an isolation structure is formed by the first isolation materiallayer and the second isolation material layer to separate the first polar material layer from the second polar material layer so as to obtain a battery core unit; and 5) cutting along the edge of thebattery core unit to obtain the battery core without the current collector.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to an electric core without a current collector, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, with the development of the economy and the advancement of science and technology, energy issues and environmental issues have become the focus of everyone's attention. The excessive consumption of fossil fuels and the growth of energy demand make the development and utilization of clean energy extremely urgent. [0003] Lithium-ion secondary battery is currently the preferred power source in the fields of digital and electric vehicle products, because it has the advantages of high energy density, high working voltage, long cycle life and no pollution. With the increasing popularity of portable smart devices, the development of portable, small-volume, high-energy-density, and high-safety thin and light battery cells has recentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0585H01M10/0525
CPCH01M10/058H01M10/0585H01M10/0525Y02E60/10Y02P70/50
Inventor 徐洲李涛
Owner SHENZHEN JULI ENERGY CO LTD
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