Lithium ion battery negative electrode sheet and battery comprising electrode sheet

A technology for lithium-ion batteries and negative pole pieces, applied in non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve problems such as reducing battery costs, achieve the effect of improving rate performance and improving charge and discharge rate performance

Inactive Publication Date: 2013-10-23
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the many technical efforts, most of the technologies can only meet the requirements of one aspe

Method used

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  • Lithium ion battery negative electrode sheet and battery comprising electrode sheet
  • Lithium ion battery negative electrode sheet and battery comprising electrode sheet
  • Lithium ion battery negative electrode sheet and battery comprising electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, Such as figure 1 As shown, a negative pole piece of a lithium ion battery, the negative pole piece 1 is provided with a crack structure, the opening of the crack structure is arranged on the surface layer of the pole piece, and the surface density of the crack 3 of the crack structure is 100m / mm 2 , the width of the crack 3 is 5um, the length of the crack 3 is 5um, the cross-sectional shape of the crack 3 is triangular, and the thickness of the pole piece is completely penetrated by the crack 3. The used negative pole piece 1 is to adopt graphite as the active material, and the distribution ratio of each component in the negative pole piece 1 is, graphite: superconducting carbon: sodium carboxymethyl cellulose: styrene-butadiene rubber=96%:1.0%:1.0%: 2.0%. The negative electrode sheet 1 is cold-pressed (compaction density 1.70g / cc), and assembled with the positive electrode sheet, separator, electrolyte and packaging bag to form a finished battery cell. I...

Embodiment 2

[0023] Example 2, Such as figure 2 As shown, the difference from Example 1 is: the surface density of the crack 3 of this example is 1000m / mm 2 , the width of the crack 3 is 12um, the length of the crack 3 is 8um, the cross-sectional shape of the crack 3 is trapezoidal, and the thickness of the pole piece is completely penetrated by the crack 3. The negative electrode sheet 1 used uses silicon as the active material, and is prepared by stirring according to the negative electrode formula (silicon: superconducting carbon: sodium carboxymethyl cellulose: styrene-butadiene rubber = 96%: 1.0%: 1.0%: 2.0%) to obtain the negative electrode slurry, and then the negative electrode slurry is coated on the copper foil current collector to prepare the negative electrode sheet, and then the negative electrode sheet is cold-pressed (the compaction density is 1.70g / cc), and the positive electrode sheet, separator, electrolyte and The packaging bag is assembled into a finished cell.

[...

Embodiment 3

[0025] Example 3, Such as image 3 Shown, and embodiment 2 is different: the surface density of the crackle 3 of this embodiment is 10m / mm 2 , the width of the crack 3 is 1um, the length of the crack 3 is 9um, the cross-sectional shape of the crack 3 is rectangular, and the thickness of the pole piece is not completely penetrated by the crack. The negative pole piece 1 used is to adopt silicon-carbon alloy as the active material, and the distribution ratio of each component in the negative pole piece 1 is, silicon-carbon alloy: superconducting carbon: sodium carboxymethyl cellulose: styrene-butadiene rubber=96%:1.0% :1.0%:2.0%. After the negative pole piece 1 is cold-pressed (compaction density 1.70g / cc), it is assembled with the positive pole piece, separator, electrolyte and packaging bag to form a finished battery cell.

[0026] Others are the same as in Embodiment 2 and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion battery, and especially relates to a lithium ion battery negative electrode sheet. The negative electrode sheet is provided with a crack structure with an opening arranged on the surface layer of the electrode sheet. With the crack structure, the absorption speed of the electrode sheet upon electrolyte can be greatly improved, and lithium ion battery settlement time can be reduced after injection. In a lithium ion battery with the crack structure, with the crack, a highway is provided for fast transmission of the electrolyte in the electrode sheet, such that battery charge/discharge rate performance can be greatly improved. The invention also discloses a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative pole piece of a lithium ion battery and a battery including the pole piece. Background technique [0002] Since the large-scale commercialization of lithium-ion batteries, they have been widely used in portable electrical appliances such as laptops, cameras, and mobile communications due to their advantages of high energy density and high power density. Although the market demand is increasing, the competition faced by lithium-ion battery manufacturers is also becoming more and more fierce. On the one hand, the fierce competition is reflected in the comparison of the performance of lithium-ion batteries, and on the other hand, it is reflected in the level of battery manufacturing costs. [0003] In order to improve the competitiveness of products, lithium-ion battery manufacturers have been working on improving battery performance and reducin...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李白清张盛武游从辉张柏清
Owner DONGGUAN AMPEREX TECH
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