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Lithium ion battery negative electrode binder and preparation method of lithium ion battery negative electrode

A lithium-ion battery and binder technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of material pulverization, inability to effectively alleviate the volume effect, and the electrode loses the conductive network, so as to control the volume effect. , the effect of improving cycle stability and broad application prospects

Active Publication Date: 2019-10-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such water-soluble polymers usually have a long linear chain structure. When the volume of silicon particles undergoes drastic changes, the volume effect cannot be effectively alleviated, and eventually the material will be pulverized and peeled off, causing the electrode to lose its complete conductive network. resulting in loss of capacity

Method used

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  • Lithium ion battery negative electrode binder and preparation method of lithium ion battery negative electrode
  • Lithium ion battery negative electrode binder and preparation method of lithium ion battery negative electrode
  • Lithium ion battery negative electrode binder and preparation method of lithium ion battery negative electrode

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Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing a cross-linked lithium ion battery silicon negative electrode binder, comprising the steps of:

[0026] (1) Mix polyacrylamide and polyacrylic acid according to the mass fraction ratio of 3:7, dissolve in 100ml deionized water, and use magnetic stirring to prepare a uniform solution.

[0027] (2) Dissolve 0.2g EDC and 0.3g NHS in 10ml deionized water, add to the mixed solution obtained in (1) after the dissolution is complete, and magnetically stir for 10 hours at room temperature to obtain a viscous homogeneous solution.

[0028] (3) The viscous solution obtained in step (4) was dialyzed twice with deionized water. Then place it in the freezer layer of the refrigerator to freeze until it is solidified, and then put it into a freeze dryer for vacuum freeze-drying to obtain a cross-linked binder.

[0029] (4) Dissolve 0.3g of the cross-linked binder obtained in step (3) in 2ml of deionized water to obtain a uniform binder solution, then weigh 0.3g...

Embodiment 2

[0032] (1) Mix polyacrylamide and polyacrylic acid evenly according to the mass fraction ratio of 4:6, dissolve in 100ml deionized water, and use magnetic stirring to prepare a uniform solution.

[0033] (2) Dissolve 0.2g EDC and 0.3g NHS in 10ml deionized water, add to the mixed solution obtained in (1) after the dissolution is complete, and magnetically stir for 10 hours at room temperature to obtain a viscous homogeneous solution.

[0034] (3) The viscous solution obtained in step (4) was dialyzed twice with deionized water. Then place it in the freezer layer of the refrigerator to freeze until it is solidified, and then put it into a freeze dryer for vacuum freeze-drying to obtain a cross-linked binder.

[0035] (4) Dissolve 0.3g of the cross-linked binder obtained in step (3) in 2ml of deionized water to obtain a uniform binder solution, then weigh 0.3g of silicon powder and 0.1g of conductive agent super P and binder The solution is mixed evenly to obtain electrode slur...

Embodiment 3

[0038] (1) Mix polyacrylamide and polyacrylic acid according to the mass fraction ratio of 5:5, dissolve in 100ml deionized water, and use magnetic stirring to prepare a uniform solution.

[0039] (2) Dissolve 0.2g EDC and 0.3g NHS in 10ml deionized water, add to the mixed solution obtained in (1) after the dissolution is complete, and magnetically stir for 10 hours at room temperature to obtain a viscous homogeneous solution.

[0040] (3) The viscous solution obtained in step (4) was dialyzed twice with deionized water. Then place it in the freezer layer of the refrigerator to freeze until it is solidified, and then put it into a freeze dryer for vacuum freeze-drying to obtain a cross-linked binder.

[0041] (4) Dissolve 0.3g of the cross-linked binder obtained in step (3) in 2ml of deionized water to obtain a uniform binder solution, then weigh 0.3g of silicon powder and 0.1g of conductive agent super P and binder The solution is mixed evenly to obtain electrode slurry. Th...

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Abstract

The invention discloses a lithium ion battery negative electrode binder and a preparation method of a lithium ion battery negative electrode, and belongs to the field of lithium ion batteries. The binder is applied to the lithium ion battery silicon-based negative electrode after crosslinking modification is carried out on commercialized polyacrylamide; the modified crosslinking binder is of a three-dimensional crosslinking net structure, the structure stability of the electrode can be promoted, and then the performance of the lithium ion battery is improved. The lithium ion battery negative electrode comprises a silicon-based negative electrode material, a conductive agent and the binder, and the weight percentage of the crosslinking network binder in the electrode is 1% to 30%. Raw materials used in the invention are water-soluble raw materials, the binder has the characteristics of being non-toxic and harmless, and the binder does not harm ecological environment and human bodies inthe production process; the production technology is simple and convenient, the production cost can be reduced obviously, and the binder has preferable market potential.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode binder and a preparation method for the lithium ion battery negative electrode. Background technique [0002] With the rapid development of the new energy field, lithium-ion batteries have been widely used in portable electronic products, pure electric vehicles, smart grids and other fields. The theoretical capacity of silicon material is 4200mAh / g, which has become the research focus of the next generation of anode materials, but the huge volume expansion of silicon during the charge and discharge process will seriously damage the cycle performance of the battery, which greatly limits its application. Therefore, controlling the volume expansion of silicon materials during charge and discharge is the key to improving the performance of lithium-ion batteries. [0003] As a key component of lithium-ion battery electrodes, bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1395H01M4/38H01M10/0525
CPCH01M4/1395H01M4/386H01M4/622H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 李平孙森何冬林曲选辉
Owner UNIV OF SCI & TECH BEIJING
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