Preparation method of silicon negative plate

A silicon negative electrode and negative electrode technology, which is applied to battery electrodes, structural parts, electrical components, etc., can solve the problems of silicon negative electrode material falling off, high working voltage, hidden safety hazards, etc., to achieve bonding performance and reduce oxidation. Effect

Pending Publication Date: 2022-06-07
FULLYMAX BATTERY CO LTD
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Problems solved by technology

[0002] Lithium batteries have the advantages of high working voltage and high energy density, and are widely used in large precision machinery, large electric tools, and digital products. However, due to the limitation of lithium battery negative electrode materials, the energy density of lithium batteries cannot be further improved. Furthermore, silicon was discovered as a replacement material for the negative electrode material of lithium batteries. The theoretical specific capacity of silicon is as high as 4200mAh / g, and the reserves are abundant. The electrode material of the sheet falls off, and the expansion of the electrode material is accompanied by a large safety hazard. In order to ensure the improvement of the energy density of the lithium battery and the safety of the lithium battery, that is, to reduce the expansion of the silicon-based negative electrode material, it is now generally used The binder with higher bonding strength adheres to the silicon-based negative electrode material to reduce the expansion degree of the silicon-based negative electrode material. The binder with higher bonding strength is generally a polymer adhesive, especially polyamide- The imide adhesive needs to be mixed and coated with the silicon-based negative electrode material and then treated at high temperature to make the monomer cross-linked and polymerized to form a network structure to realize the polymer adhesive on the silicon-based negative electrode material and foil. In the process of high-temperature treatment of the negative electrode sheet, it is easy to cause oxidation of the copper foil, which in turn affects the electrical properties of the negative electrode sheet

Method used

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  • Preparation method of silicon negative plate
  • Preparation method of silicon negative plate

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preparation example Construction

[0030] The present application provides a preparation method of a silicon negative electrode sheet. The preparation method of the above-mentioned silicon negative electrode sheet includes the following steps: obtaining a negative electrode sheet, and the negative electrode sheet is coated with a negative electrode slurry comprising a silicon-based negative electrode material and a polymer adhesive; and a hollow roller is used to wind the negative electrode sheet to obtain Negative electrode roll; use a coating film to seal the negative electrode roll, so that the outer circumference of the negative electrode roll forms a coating cylinder, and the length of the coating cylinder is greater than the length of the negative electrode roll; use a blocking member to seal the negative electrode roll. Blocking treatment, so that the two ends of the coating cylinder are squeezed into the hollow roller, and the blocking member is inserted through the hollow roller, and the coating film co...

Embodiment 1

[0066] Disperse and mix 10kg of silicon oxide powder, a mixture of 2kg of Ketjen black and carbon nanotubes, and a mixture of 1kg of polyvinylidene fluoride and an appropriate amount of N-methylpyrrolidone to obtain a negative electrode slurry;

[0067] Coating the negative electrode slurry on the copper foil sheet, and then performing roll drying to obtain a negative electrode sheet;

[0068] The negative electrode coil was wound on the hollow roller, and then, the coating film with a thickness of 8 μm was wound on the negative electrode coil to form a coating cylinder, and then the two ends of the coating cylinder were squeezed into the hollow roller with a wooden stopper. inside and fix the covering film;

[0069] Put the sealed negative electrode coil into an oven, heat treatment for 15 minutes at a temperature of 110 °C, and then continue heat treatment for 15 minutes at a temperature of 150 °C, and then heat at a temperature of 250 °C. , and then continue heat treatment...

Embodiment 2

[0072] Disperse and mix 10kg of silicon oxide powder, a mixture of 2kg of Ketjen black and carbon nanotubes, and a mixture of 1kg of polyvinylidene fluoride and an appropriate amount of N-methylpyrrolidone to obtain a negative electrode slurry;

[0073] Coating the negative electrode slurry on the copper foil, then rolling and drying at 80°C for 2 hours to obtain a negative electrode sheet;

[0074] The negative electrode was wound on the hollow roller, and then, the coating film with a thickness of 10 μm was wound on the negative electrode to form a coating cylinder, and then the two ends of the coating cylinder were squeezed into the hollow roller with a wooden stopper. inside and fix the covering film;

[0075] Put the sealed negative electrode coil into an oven, heat treatment for 10 minutes at a temperature of 110 °C, and then continue to heat treatment for 10 minutes at a temperature of 150 °C, and then heat at a temperature of 250 °C. , and then continue to heat treatm...

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Abstract

The invention provides a preparation method of a silicon negative plate. The preparation method of the silicon negative electrode plate comprises the following steps: obtaining a negative electrode plate, wherein the negative electrode plate is coated with negative electrode slurry comprising a silicon-based negative electrode material and a polymer adhesive; winding the negative plate by adopting a hollow roller to obtain a negative roll; the negative electrode roll is sealed through a coating film, so that a coating barrel is formed on the periphery of the negative electrode roll, and the length of the coating barrel is larger than that of the negative electrode roll; the negative electrode roll subjected to sealing treatment is subjected to sealing treatment through a sealing part, so that the two ends of the wrapping barrel are squeezed into the hollow roller, the sealing part penetrates through the hollow roller, and the wrapping films at the two ends of the wrapping barrel are clamped between the hollow roller and the sealing part; and carrying out staged heat treatment on the blocked negative electrode roll. According to the preparation method of the silicon negative electrode sheet, the bonding performance of the silicon-based negative electrode material can be realized, and the oxidation degree of the copper foil sheet can be reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a silicon negative electrode sheet. Background technique [0002] Lithium batteries have the advantages of high working voltage and high energy density, and are widely used in large precision machinery, large power tools and digital products. However, due to the limitation of lithium battery anode materials, the energy density of lithium batteries cannot be further improved. And then found the replacement material of lithium battery negative electrode material - silicon, the theoretical specific capacity of silicon is as high as 4200mAh / g, and the reserves are abundant, but the silicon-based negative electrode material will be accompanied by a large volume change during the charging and discharging process, causing the silicon negative electrode The electrode material of the sheet falls off, and the expansion of the electrode material is accompanied by a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395Y02E60/10
Inventor 邓健想刘长昊
Owner FULLYMAX BATTERY CO LTD
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