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Separator comprising porous adhesive layer, and lithium secondary battery using same

A technology of adhesive layer and separator, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of increasing the air permeability of the separator, easy deterioration of battery charging and discharging characteristics, and insufficient shape stability of the battery. , to achieve the effect of increasing the air permeability

Pending Publication Date: 2018-12-21
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinyl alcohol may lead to insufficient shape stability of the battery
Specifically, due to charging and discharging, the thermal shrinkage rate of the separator is increased, and the air permeability of the separator is increased, so that the charging and discharging characteristics of the battery can be easily deteriorated

Method used

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  • Separator comprising porous adhesive layer, and lithium secondary battery using same
  • Separator comprising porous adhesive layer, and lithium secondary battery using same
  • Separator comprising porous adhesive layer, and lithium secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Preparation of the first porous adhesive layer composition

[0083] By mixing polyvinylidene fluoride homopolymer (weight average molecular weight: 450000 g / mol, XPH-838, Solvey) in water to 25 wt%, and using a stirrer (R010, I.K Co., Ltd.) The mixture was stirred for 2 hours to prepare a first polymer solution including polyvinylidene fluoride-based polymer microparticles having an average particle diameter of 500 nm. On the other hand, the second polymer was prepared by mixing polyethyleneimine (weight-average molecular weight: 70000 g / mol, P-1050, Epomin) with water to 7 wt%, and stirring the mixture with a stirrer at 25°C for 2 hours. substance solution. 25wt% of the first polymer solution and 7wt% of the second polymer solution were mixed to have a weight ratio of 9:1 between polyvinylidene fluoride-based polymer particles and polyethyleneimine, and then, at 25 °C for 30 minutes with a stirrer to prepare a first porous adhesive layer composition.

[0084] Pa...

Embodiment 2

[0087] Preparation of the second porous adhesive layer composition

[0088] In addition to mixing 25 wt% of the first polymer solution and 7 wt% of the second polymer solution to have a weight ratio of 9.6:0.4 between polyvinylidene fluoride-based polymer particles and polyethyleneimine, according to The second porous adhesive layer composition was prepared in the same manner as in Example 1.

[0089] Partition manufacturing

[0090] A separator having a total thickness of 10 μm according to Example 2 was manufactured in the same manner as in Example 1 except that the second porous adhesive layer composition was used instead of the first porous adhesive layer composition of Example 1.

Embodiment 3

[0092] Preparation of the third porous adhesive layer composition

[0093] A third porous adhesive layer composition was prepared in the same manner as the preparation of the second porous adhesive layer composition according to Example 2.

[0094] Partition manufacturing

[0095] Except that the third porous adhesive layer composition was used instead of the first porous adhesive layer composition of Example 1 and the third porous adhesive layer composition was coated on one surface of the polyethylene film instead of on its A separator having a total thickness of 10 μm according to Example 3 was produced in the same manner as in Example 1 except on both surfaces.

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Abstract

The present invention relates to a separator, a manufacturing method therefor, and a lithium secondary battery comprising the same, the separator comprising: a porous substrate; and a porous adhesivelayer formed on one surface or both surfaces of the porous substrate, wherein the porous adhesive layer comprises a nitrogen-containing binder and polyvinylidene fluoride-based polymer microparticleshaving an average diameter of 200-700 nm, and the total thickness of the porous adhesive layer is 1 [mu]m or less.

Description

technical field [0001] The present invention relates to a separator and a lithium secondary battery using the separator, the separator comprising a porous substrate and a porous adhesive layer formed on one surface or both surfaces of the porous substrate, wherein the porous adhesive layer comprises Polymer particles of polyvinylidene fluoride and nitrogen-containing binder. Background technique [0002] A lithium secondary battery is an energy storage device that can reversibly convert chemical energy into electrical energy and has a high energy density. Recently, lithium secondary batteries have been used in hybrid electric vehicles (HEVs), plug-in electric vehicles, electric bicycles, and energy storage systems (ESS) to address environmental concerns, high oil prices, and energy efficiency and storage. [0003] A lithium secondary battery may include a separator. The separator refers to an intermediate layer that separates the positive and negative electrodes in the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/42H01M50/423H01M50/426H01M50/443H01M50/451H01M50/457H01M50/491
CPCH01M10/0525Y02E60/10H01M50/426H01M50/457H01M50/451H01M50/403H01M50/446H01M50/491H01M50/443H01M50/423H01M50/42H01M50/461H01M50/449H01M50/463H01M10/42H01M50/46H01M2010/4292Y02P70/50
Inventor 姜世莹金佳仁金柄秀金容庆
Owner SAMSUNG SDI CO LTD
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