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Composite pole sheet and manufacturing method thereof, and lithium ion battery

A production method and pole piece technology, applied in the field of lithium ion secondary batteries, can solve the problems of harsh operating conditions, cumbersome processes, unfavorable large-scale industrial production, etc., and achieve low cost, simple production process and technology, and improved safety performance and cycle. performance effect

Pending Publication Date: 2020-12-04
安徽盟维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

However, the above-mentioned method is relatively cumbersome and the operating conditions are harsh, which is not conducive to the realization of large-scale industrial production.

Method used

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  • Composite pole sheet and manufacturing method thereof, and lithium ion battery
  • Composite pole sheet and manufacturing method thereof, and lithium ion battery
  • Composite pole sheet and manufacturing method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of a lithium metal / carbon nanomaterial composite negative plate, comprising the steps of:

[0039] 1) Dissolve 50mg of SBR in NMP solvent (0.5wt%), and magnetically stir (300rpm / min) at 25°C for 30min to disperse evenly to obtain a reaction solution;

[0040]2) Grind and polish a lithium metal sheet with a size of 8.0cm*6.5cm with a 1000-mesh grinding block, then immerse it in the above reaction solution for 10 seconds, take it out, and place it in a clean watch glass for 10 seconds;

[0041] 3) Submerge the lithium metal sheet treated in step 2) in the graphene powder so that its outer surface is completely covered by black graphene and no lithium metal glossy surface is exposed, and then apply pressure to the lithium metal / graphene with a roller On, until a dense graphene layer is formed on the surface of the lithium metal sheet and no powder falls off, a lithium metal / graphene composite negative electrode sheet is finally obtained.

[0042] The ...

Embodiment 2

[0044] A preparation method of a lithium metal / carbon nanomaterial composite negative plate, comprising the steps of:

[0045] 1) Dissolve 50mg of SBR in DMF solvent (1.0wt%), and magnetically stir (300rpm / min) at 25°C for 60min to disperse evenly to obtain a reaction solution;

[0046] 2) Grind and polish a lithium metal sheet with a size of 8.0cm*6.5cm with a 1000-mesh grinding block, then immerse it in the above reaction solution for 20 seconds, take it out, and let it stand for 15 seconds;

[0047] 3) Immerse the lithium metal sheet treated in step 2) in the carbon nanotube powder, so that the outer surface is completely covered by the carbon nanotube and no lithium metal glossy surface is exposed, and then apply pressure to the lithium metal / carbon with a roller. A dense carbon nanotube layer is formed on the nanotube sheet up to the surface of the lithium metal sheet without powder falling off, and finally a lithium metal / carbon nanotube composite negative electrode shee...

Embodiment 3

[0050] A preparation method of a lithium metal / carbon nanomaterial composite negative plate, comprising the steps of:

[0051] 1) Dissolve 100mg of zinc fluoride in THF solvent (1.0wt%), and magnetically stir (300rpm / min) at 25°C for 40min to disperse evenly to obtain a reaction solution;

[0052] 2) Grind and polish a lithium metal sheet with a size of 8.0cm*6.5cm with a 1000-mesh grinding block, then immerse it in the above reaction solution for 30s, take it out, and let it stand for 10s;

[0053] 3) Place a piece of carbon paper (8.0cm*6.5cm) of the same size on the upper and lower surfaces of the lithium metal sheet treated in step 2), and put it into a roller press as a whole, and adjust the pressure to 5MPa to make the lithium metal sheet The surface is closely combined with carbon paper, and finally a lithium metal / carbon paper composite negative electrode sheet is obtained.

[0054] The obtained lithium metal / carbon paper composite negative electrode sheet, nickel-cob...

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Abstract

The invention discloses a composite pole sheet and a manufacturing method thereof, and a lithium ion battery. The manufacturing method of the composite pole sheet comprises the step of forming a carbon nano material layer on the surface of an electrode matrix in a mechanical rolling manner. According to the manufacturing method of the composite electrode, the manufacturing process is simple, the cost is low, and large-scale production is easy; the protective layer in the composite pole sheet can improve the rigidity of a solid electrolyte interface and inhibit the growth of lithium dendrites while the carbon nano skeleton structure outside the protective layer plays a good role in supporting lithium metal so as to slow down the volume change of the lithium metal in the deposition / dissolution process and eliminate the thickness change of the lithium metal negative electrode in the charging / discharging process; and due to the existence of the carbon nano skeleton structure, the specificsurface area can be increased, the local current density is reduced, the growth of lithium dendrites is inhibited, and battery short circuit is prevented.

Description

technical field [0001] The invention particularly relates to a composite pole piece, a manufacturing method thereof and a lithium ion battery, belonging to the technical field of lithium ion secondary batteries. Background technique [0002] Lithium-ion batteries are widely used in portable devices such as mobile phones, notebook computers, and digital products. With the vigorous promotion of electric vehicles, higher requirements are placed on the energy density and power density of lithium-ion batteries. Traditional lithium-ion battery anode materials mostly use carbon nanomaterials. Although carbon anode materials show excellent safety performance and cycle stability, their theoretical reversible specific capacity is only 372mAh / g, and it is difficult for the battery energy density to exceed 300Wh / kg. It can no longer meet the needs of electric vehicles with long cruising range. [0003] Metal lithium negative electrode has high theoretical specific capacity (3860mAh / g),...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/04H01M4/134H01M10/0525H01M10/42
CPCH01M4/0435H01M4/134H01M4/1395H01M10/0525H01M10/4235Y02E60/10
Inventor 张跃钢周飞汪利萍戎泽徐文善孙亢何俊张辉周丽莎
Owner 安徽盟维新能源科技有限公司
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