Process design for reducing impedance of silicon monoxide-graphite negative electrode and impedance diagnosis method

A silicon oxide and graphite anode technology, applied in the field of lithium-ion batteries, can solve the problem of insufficient charge data, provide an intuitive and accurate data reference, poor consistency and reliability of test data, and it is difficult to accurately express the silicon carbon anode material. Specific capacity contribution and other issues

Inactive Publication Date: 2021-03-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above detection methods are difficult to accurately express the actual specific capacity contribution of silicon carbon anode materials in real batteries, because the consistency and reliability of the test data are very poor
Therefore, the above deduction data are not enough to provide intuitive and accurate data reference for researchers engaged in the selection of negative electrode materials in battery factories

Method used

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  • Process design for reducing impedance of silicon monoxide-graphite negative electrode and impedance diagnosis method
  • Process design for reducing impedance of silicon monoxide-graphite negative electrode and impedance diagnosis method
  • Process design for reducing impedance of silicon monoxide-graphite negative electrode and impedance diagnosis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The process design for reducing the silicon oxide-graphite composite negative electrode impedance described in Example 1 is as follows:

[0034] The various raw materials and their corresponding mass distributions are shown in the table below:

[0035]

[0036]

[0037] 1) First, silicon oxide and natural graphite with a particle size of 3 to 5 microns and amorphous carbon deposition on the surface are added to the binder A petroleum asphalt, and mixed evenly by a jet mixer;

[0038] 2) Then add the compound of granular acetylene black and nanowire carbon fiber, and mix again through ball mill equipment to ensure uniform dispersion of materials;

[0039] 3) Then heat treatment at 400°C to 1000°C for 1h to 5h under a protective atmosphere of hydrogen-argon mixed gas (hydrogen gas fraction 5%) to obtain a primary silicon-carbon composite material;

[0040] 4) Then import the silicon-carbon primary composite material into the fusion machine equipment with the abilit...

Embodiment 2

[0049] The process design for reducing the silicon oxide-graphite composite negative electrode impedance described in Example 2 is as follows:

[0050] The various raw materials and their corresponding mass distributions are shown in the table below:

[0051] raw material mass (g) Silicon oxide 6 artificial graphite 94 Super P 2 carbon nanotubes 2 Phenolic Resin 8 asphalt 4

[0052] 1) First, silicon oxide and artificial graphite with a particle size of 5 to 10 microns are added to the binder A phenolic resin, and mixed uniformly by a ball mill;

[0053] 2) Then add the compound of granular Super P and nanowire-shaped carbon nanotubes, and mix again through ball mill equipment to ensure uniform dispersion of materials;

[0054] 3) Then heat treatment at 700°C to 900°C for 1h to 8h under a protective atmosphere of hydrogen-argon mixed gas (hydrogen gas fraction: 2%) to obtain a silicon-carbon primary composite material;

[0...

Embodiment 3

[0063] The process design for reducing the silicon oxide-graphite composite negative electrode impedance described in Example 3 is as follows:

[0064] The various raw materials and their corresponding mass distributions are shown in the table below:

[0065] raw material mass (g) Silicon oxide 8 artificial graphite 82 natural graphite 10 carbon fiber 2 Polycyclic aromatic derivatives 8 PVC 10

[0066] 1) First, add silicon oxide, artificial graphite, and natural graphite with a particle size of 9 to 12 microns pre-lithiated on the surface into the binder A phenolic resin, and mix them uniformly through a pot mill;

[0067] 2) Then add the carbon fiber composite, and mix again through the airflow mixer equipment to ensure that the material is uniformly dispersed;

[0068] 3) Then heat treatment at 500°C to 800°C for 1h to 5h under a nitrogen protective atmosphere to obtain a primary silicon-carbon composite material;

[006...

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Abstract

The invention discloses a process design for reducing the impedance of a silicon monoxide graphite negative electrode and an and impedance diagnosis method. The process comprises the following steps:adding silicon monoxide and graphite into a binder A, uniformly mixing, adding a compound of a granular conductive agent and a nanowire-shaped conductive agent, carrying out mixing by equipment, and carrying out heat treatment and particle size grading to obtain a silicon-carbon primary composite material; introducing the silicon-carbon primary composite material into specific equipment, dispersing the silicon-carbon primary composite material, a surface modifier and a carbon-based modified material additive, and performing subsequent heat treatment to obtain a silicon-carbon secondary composite material; processing the silicon-carbon secondary composite material through slurry of a high-activity substance, a low-conductivity agent and a low-binding agent and a pole piece manufacturing process to obtain a silicon-carbon negative pole piece; matching a positive electrode and a negative electrode according to the capacity surface density ratio of the positive electrode and the negative electrode to manufacture a one-to-two mode total battery with double positive electrodes and single negative electrode; and carrying out activation cycle on the whole battery, carrying out an alternating current impedance test, and measuring impedance values of corresponding parameters. According to the invention, the impedance diagnosis method matched with the method is designed in a more targetedmanner.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more specifically relates to a process design and an impedance diagnosis method for reducing the impedance of a silicon oxide-graphite negative electrode. Background technique [0002] Silicon carbon anode material is considered to be a kind of anode material that will soon replace graphite, including artificial graphite and natural graphite, and gradually become the preferred anode material for high-capacity lithium-ion batteries and all-solid-state lithium-ion batteries. At present, the large-scale, low-cost, and uniform synthesis technology of high-performance silicon-carbon anode materials is a very urgent research focus. In addition, the rapid diagnosis of the performance parameters of the small batch of silicon carbon samples existing in the market before use, including the physical properties of the material, the characteristics of the slurry, and the performance paramete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/587H01M4/62H01M10/0525G01R31/389
CPCG01R31/389H01M4/483H01M4/587H01M4/624H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 吴若飞徐丽敏李铮铮杨兵陶军
Owner BAOSHAN IRON & STEEL CO LTD
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