Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet

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

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

AI Technical Summary

Problems solved by technology

Among the many technical efforts, most of the technologies can only meet the requirements of one aspect, either can only improve the performance of the battery, or can only reduce the cost of the battery

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, such as figure 1 As shown, a positive pole piece of a lithium ion battery, the positive 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 positive pole piece 1 is obtained by stirring, coating and preparing cracks. The positive pole piece 1 used is to use lithium cobaltate as the active material, and prepare the positive electrode slurry according to the positive electrode formula (lithium cobaltate: polyvinylidene fluoride: superconducting carbon = 96.0%:2.0%:2.0%), and then The positive electrode slurry is coated on the aluminum foil current collector to prepare the positive electrode sheet 1, an...

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 positive electrode sheet 1 used is cobalt nickel cobalt manganese as the active material, and the distribution ratio of each component in the positive electrode sheet 1 is: nickel cobalt manganese: polyvinylidene fluoride: superconducting carbon=96.0%:2.0%:2.0%. The positive electrode sheet 1 is cold-pressed (compacted density 4.20g / cc), and assembled with the negative electrode sheet, separator, electrolyte and packaging bag to form a finished cell.

[0024] Others are the same as in Embodiment 1 and will not be repeated here.

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 positive electrode sheet 1 used is to use lithium iron phosphate as the active material, according to the positive electrode formula (lithium iron phosphate: polyvinylidene fluoride: superconducting carbon = 96.0%: 2.0%: 2.0%) to prepare the positive electrode slurry by stirring, and then The positive electrode slurry is coated on the aluminum foil current collector to prepare the positive electrode sheet 1, and then the positive electrode sheet 1 is cold-pressed (the compaction density is 4.20g / cc), and assembled with the negative electrode sheet, separator, electrolyte and packaging bag. Finished batteries.

[0026] Others are th...

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Abstract

The invention belongs to the technical field of lithium ion battery, and especially relates to a positive electrode sheet of a lithium ion battery. The positive electrode sheet is provided with a crack structure, wherein the opening of the crack structure is provided on the surface layer of the electrode sheet. With the crack structure, absorption rate of the electrode sheet upon electrolyte can be greatly improved, and standing time after liquid injection of the lithium ion battery can be reduced. In a lithium ion battery with the crack structure, with the existence of the crack, a highway is provided for rapid transmission of the electrolyte in the electrode sheet, and battery charge / discharge rate capability is greatly improved. Also, the invention 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 positive 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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