Preparation method of silicon-based negative electrode material based on polyamic acid-based electrode binder

A silicon-based negative electrode material and polyamic acid-based technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of limited ability to inhibit expansion, cycle stability, complex composition and ratio requirements, etc., to achieve The effect of improving cycle stability, enhancing structural integrity and volume stability, and excellent mechanical properties

Inactive Publication Date: 2021-03-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composition and ratio requirements of these binders are complex, the ability to inhibit expansion and improve cycle stability is limited, and more emphasis is placed on the investigation of carbon anode materials, which cannot solve the problem of silicon anode materials on binders. Functional Requirements

Method used

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  • Preparation method of silicon-based negative electrode material based on polyamic acid-based electrode binder
  • Preparation method of silicon-based negative electrode material based on polyamic acid-based electrode binder

Examples

Experimental program
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Effect test

Embodiment 1

[0019] In this Example 1, a polyamic acid copolymer modified by a silane coupling agent as a binder, a method of preparing a silicon-based negative electrode material based on a polyamic acid-based electrode adhesive, and specifically, the steps are as follows: nanometers Silicon powder, silane coupling modified polyamic acid copolymers and SUPER P are weighed by weight ratio of 90: 5: 5, and N-methyl-2-pyrrolidone is added, and the mixture is stirred at room temperature for 30 min to form uniform slurry. The slurry was applied to a copper foil having a thickness of 5 μm, transferred to a vacuum drying tank, and dried at 70 ° C for 12 h. The resulting current collector is punched into a sheet, and the density of the active material is 1 mg / cm. 3 Electrode of lithium battery.

Embodiment 2

[0021] In this Example 2, a polyamic acid copolymer modified by a silane coupling agent is used as an adhesive, a method of preparing a silicon-based negative electrode material based on a polyamic acid-based electrode adhesive, and specifically includes the steps: nanometers Silicon powder, silane coupling modified polyamic acid copolymer and SUPER P are weighed according to weight ratio of 80:10:10, and N-methyl-2-pyrrolidone is added, and the mixture is stirred at room temperature for 30 min to form uniform slurry. The slurry was applied to a copper foil having a thickness of 5 μm, transferred to a vacuum drying tank, and dried at 70 ° C for 12 h. The resulting current collector is punched into a sheet, and the density of the active material is 1 mg / cm. 3 Electrode of lithium battery.

Embodiment 3

[0023] In this Example 3, a polyamic acid copolymer modified by a silane coupling agent as a binder, a method of preparing a silicon-based negative electrode material based on a polyamic acid-based electrode adhesive, and specifically, the steps are as follows: nanometers Silicon powder, silane coupling modified polyamic acid copolymer and SUPER P are weighed according to weight ratio of 70:15:15, and N-methyl-2-pyrrolidone is added, and stirred at room temperature for 30 min to form uniform slurry. The slurry was applied to a copper foil having a thickness of 5 μm, transferred to a vacuum drying tank, and dried at 70 ° C for 12 h. The resulting current collector is punched into a sheet, and the density of the active material is 1 mg / cm. 3 Electrode of lithium battery.

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Abstract

The invention relates to a preparation method of a silicon-based negative electrode material based on a polyamic acid-based electrode binder, belongs to the technical field of secondary batteries, andsolves the technical problem that a binder is used for preparing a silicon negative electrode of a secondary battery. The preparation method comprises the following steps: first, adding the organic silicon modified polyamic acid copolymer binder, a silicon-containing active material and a conductive auxiliary agent into a solvent according to a mass ratio of 5-20: 60-80: 5-20, and uniformly stirring at room temperature for 30 min -12 h to prepare pasty slurry; then, coating a current collector with the prepared slurry; and finally, drying the current collector coated with the slurry at the drying temperature of 60-80 DEG C, and after drying is completed, manufacturingthe silicon-based negative electrode through stamping forming. The preparation method is low in cost and easy to operate, can effectively maintain the structural stability of the active material, and has relatively high cyclic specific capacity and cyclic stability.

Description

Technical field [0001] The present invention belongs to the secondary battery technology, and in particular, the present invention relates to a method of preparing a silicon-based negative electrode material based on a polyamic acid-based electrode adhesive. Background technique [0002] Secondary batteries are widely used in portable electronic products due to their higher energy density and magnification characteristics. As the scope of application gradually expands to high storage in electric vehicles, aerospace, the energy density and safety stability of the secondary battery have put forward higher requirements. [0003] For current commercial secondary batteries, the general use of lower graphite negatives, which is easy to have a certain dendritic crystal, and there is security risk. Therefore, the use of high-capacity and high safety silicon-based negative electrode materials instead of graphite and other carbon-based materials, becomes an important way to improve the ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/62H01M4/38H01M10/0525
CPCH01M4/1395H01M4/386H01M4/622H01M4/628H01M4/624H01M10/0525H01M2004/027Y02E60/10
Inventor 刘耀东张强于毓秀
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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