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Lithium battery negative electrode adhesive and negative electrode sheet

A technology of lithium battery and negative electrode sheet, applied in the field of lithium battery negative electrode adhesive and negative electrode sheet, can solve the problems of poor surface conductivity of silicon-based negative electrode, incomplete coverage of active material, irreversible capacity loss, etc., to improve cycle performance and excellent ductility. , to promote the effect of fast transmission

Active Publication Date: 2022-04-01
衡阳领湃新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional adhesives such as CMC / SBR have a single function, and the traditional dispersion method makes the conductive / adhesive network cover the active material incomplete. When the silicon particles are severely pulverized, they are easily peeled off from the electrode, resulting in larger The irreversible capacity loss; in addition, the surface conductivity of the silicon-based negative electrode is poor, resulting in an increase in electrode impedance

Method used

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  • Lithium battery negative electrode adhesive and negative electrode sheet
  • Lithium battery negative electrode adhesive and negative electrode sheet
  • Lithium battery negative electrode adhesive and negative electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of lithium battery negative electrode adhesive: mix polymer II and polymer IV in a mass ratio of 1:2.

[0057] Preparation of the negative electrode sheet: In terms of weight percentage of dry material, 1% to 3% of the lithium battery negative electrode adhesive of Example 1, 95% to 98.5% of artificial graphite and 0.5% to 2% of SP are mixed to form a mixture, The mixture is coated on the current collector, and hot-pressed to form the negative electrode sheet of the lithium battery.

[0058] Preparation of positive electrode sheet: 95% to 97% of nickel-cobalt lithium manganese oxide, 1.5% to 2% of PVDF (polyvinylidene fluoride), and 1% to 3% of conductive carbon are mixed and produced based on the weight percentage of dry materials The slurry, the solvent of the slurry is N-methylpyrrolidone (NMP). The slurry is evenly coated on both sides of the aluminum foil, and then the aluminum foil is hot-rolled and compacted by a roller press to obtain a positive ele...

Embodiment 2

[0061] Preparation of lithium battery negative electrode adhesive: polymer II, polymer IV and polymer V were mixed in a mass ratio of 2:3:5.

[0062] Preparation of the negative electrode sheet: In terms of weight percentage of dry material, 1% to 3% of the lithium battery negative electrode adhesive of Example 2, 95% to 98.5% of artificial graphite and 0.5% to 2% of SP are mixed to form a mixture, The mixture is coated on the current collector, and hot-pressed to form the negative electrode sheet of the lithium battery.

[0063] Preparation of positive electrode sheet: same as Example 1.

[0064] Preparation of lithium battery: cut the positive electrode sheet of Example 1 and the negative electrode sheet of Example 2, and the rest of the steps are the same as in Example 1.

Embodiment 3

[0066] Preparation of lithium battery negative electrode adhesive: polymer II and polymer III were mixed in a mass ratio of 1:1.

[0067] Preparation of the negative electrode sheet: In terms of weight percentage of dry material, 1% to 3% of the lithium battery negative electrode adhesive of Example 3, 95% to 98.5% of artificial graphite and 0.5% to 2% of SP are mixed to form a mixture, The mixture is coated on the current collector, and hot-pressed to form the negative electrode sheet of the lithium battery.

[0068] Preparation of positive electrode sheet: same as Example 1.

[0069] Preparation of lithium battery: cut the positive electrode sheet of Example 1 and the negative electrode sheet of Example 3, and the rest of the steps are the same as in Example 1.

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Abstract

The present application provides a lithium battery negative electrode adhesive and a negative electrode sheet. The lithium battery negative electrode adhesive includes at least two polymers among polymer I, polymer II, polymer III and polymer IV. The lithium battery negative electrode sheet includes a current collector and a coating layer on the surface of the current collector, and the coating layer includes at least two polymers among polymer I, polymer II, polymer III and polymer IV. The lithium battery negative electrode adhesive of the present application has excellent ductility and toughness, and the lithium battery negative electrode adhesive can be continuously distributed in the active material to form a 3D cross-linked conductive and buffer network, which can effectively suppress the phenomenon of powdering and peeling, and maintain electrical conductivity. The integrity of the network, thereby improving the cycle performance of silicon-based negative electrode materials, and giving full play to the high specific capacity characteristics of silicon-based materials.

Description

technical field [0001] The present application relates to the technical field of energy storage devices, in particular to a lithium battery negative electrode adhesive and a negative electrode sheet. Background technique [0002] The role of the adhesive in the electrode material is to build an efficient, uniform, and stable conductive / ion transport network to ensure good electrical contact and uniform current density on the microscopic scale, so that the redox reaction can proceed normally. have a great impact, especially on cycle life. [0003] Due to its high expansion and easy pulverization, the new silicon-based anode poses new challenges to the performance of the adhesive. Traditional adhesives such as CMC / SBR have a single function, and the traditional dispersion method makes the conductive / adhesive network cover the active material incomplete. When the silicon particles are severely pulverized, they are easily peeled off from the electrode, resulting in larger The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/622H01M10/052H01M4/624H01M4/628Y02E60/10
Inventor 韩园园王欢崔立丰
Owner 衡阳领湃新能源科技有限公司