Negative pole piece of lithium ion battery, preparation method of negative plate and lithium ion battery

A lithium-ion battery, negative electrode technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as electrode cracks, affecting the electronic path and conductivity of the electrode, and achieve long cycle life and excellent capacity retention. rate and rate performance, and the effect of improving energy density

Pending Publication Date: 2019-09-13
SHENZHEN UTILITY POWER SOURCE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium-ion battery negative electrode, which aims to solve the mechanical stress caused by the expansion and contraction of the silicon-based negative electrode material of the existing lithium-ion battery during the charging and discharging process, resulting in cracks inside the pole piece, affecting the electrode. Overall electronic pathways and technical issues such as conductivity

Method used

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  • Negative pole piece of lithium ion battery, preparation method of negative plate and lithium ion battery
  • Negative pole piece of lithium ion battery, preparation method of negative plate and lithium ion battery
  • Negative pole piece of lithium ion battery, preparation method of negative plate and lithium ion battery

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preparation example Construction

[0050] The embodiment of the present invention also provides a method for preparing a negative electrode sheet of a lithium ion battery, comprising the following steps:

[0051] S10. Obtain copper foil as the negative electrode collector;

[0052] S20. Acquiring silicon-based materials and carbon-based materials, depositing the silicon-based materials and the carbon-based materials on the copper foil, so that alternately distributed strips of carbon-based materials are formed on the copper foil from left to right 1 and a silicon-based material strip 2, the carbon-based material strip 1 and the silicon-based material strip 2 are in conductive contact with each other to obtain a deposition product;

[0053] S30. Drying and rolling the deposited product to obtain a lithium-ion battery negative electrode sheet.

[0054] The preparation method of the lithium-ion battery negative plate provided by the embodiment of the present invention, after obtaining the copper foil, silicon-bas...

Embodiment 1

[0064] A lithium ion battery comprising:

[0065] Negative electrode sheet: Alternately coated with 2 cm artificial graphite HSG carbon-based material strips 1 and 5 cm silicon-oxygen composite SO450 silicon-based material strips on the copper foil from left to right in the transverse direction of the negative electrode sheet coating direction 2. The material coating thickness is 80 microns. The contact surface of the carbon-based material strip 1 and the silicon-based material strip 2 is plane;

[0066] Assemble the negative electrode sheet, the positive electrode sheet and the diaphragm to make a 053048 type pouch battery.

Embodiment 2

[0068] A lithium ion battery comprising:

[0069] Negative electrode sheet: Alternately coated with 5 cm artificial graphite HSG carbon-based material strip 1 and 5 cm silicon-oxygen composite material SO450 silicon-based material strip on the copper foil from left to right in the transverse direction of the coating direction of the negative electrode sheet 2. The material coating thickness is 80 microns. The contact surface of the carbon-based material strip 1 and the silicon-based material strip 2 is plane.

[0070] A 053048 type pouch battery was assembled by assembling the same positive electrode sheet and diaphragm as the negative electrode sheet in Example 1.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative pole piece of a lithium ion battery. The negative pole piece of the lithium ion battery comprises a negative current collector and a negative material layer arranged on the negative current collector, wherein the negative electrode material layer is composed of carbon material strips and silicon-based material strips which are sequentially and alternately distributed from left to right, namely, the carbon material strip-the silicon-based material strip-the carbon material strip-the silicon-based material strip-the carbon material strip. According to the negative pole piece of the lithium ion battery, the energy density of the battery is effectively improved, and the battery has excellent capacity retention rate and rate performance in the cycling process.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery negative plate, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion battery has many advantages such as high voltage, high energy density, long cycle life, small self-discharge, no memory effect, wide operating temperature range, and environmental friendliness. It is recognized as an ideal chemical energy source in today's society and is commonly used in modern life. Energy storage and conversion devices are widely used in portable electronic devices such as mobile phones and laptop computers, large-scale energy storage power stations and electric vehicles. In order to achieve high energy density in existing lithium-ion batteries, the surface density of the positive electrode is increased, and at the same time, the negative electrode needs to use active materials with a higher gram capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 钟国兵李清霞孟亚斌王继生
Owner SHENZHEN UTILITY POWER SOURCE CO LTD
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