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Separator for lithium secondary battery having enhanced electrode adhesive strength and improved resistance characteristics, and

A lithium secondary battery and separator technology, applied in secondary batteries, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve problems such as unfavorable adhesion and unfavorable resistance, increase adhesion surface area, improve interface resistance, improve Effects of Output and Lifetime Characteristics

Pending Publication Date: 2022-03-04
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, it is known that PVdF-based polymers with excellent adhesion are disadvantageous in electrical resistance, while PVdF-based polymers with favorable electrical resistance characteristics are disadvantageous in adhesion

Method used

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  • Separator for lithium secondary battery having enhanced electrode adhesive strength and improved resistance characteristics, and
  • Separator for lithium secondary battery having enhanced electrode adhesive strength and improved resistance characteristics, and
  • Separator for lithium secondary battery having enhanced electrode adhesive strength and improved resistance characteristics, and

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Preparation of Porous Coating Forming Composition

[0099] As inorganic particles, prepared Al-containing particles with an average diameter of 500nm 2 o 3 A mixture of powder and γ-AlOOH powder (weight ratio 9:1) with an average diameter of 250 nm.

[0100] As the binder polymer, two types of PVdF-based binder polymers were prepared, among which PVdF-HFP binder polymer (Solvay Company, Solef 21510) was prepared as the first PVdF-based binder polymer, Also, a PVdF-TFE binder polymer (Daikin Corporation, VT-475) was prepared as a second PVdF-based binder polymer.

[0101] The first PVdF-based binder polymer and the second PVdF-based binder polymer were mixed at a weight ratio of 1:1, and the resulting mixture was dissolved in N-methylpyrrolidone (NMP ) for about 4 hours to prepare the binder polymer solution.

[0102] The mixed inorganic particles were added to the binder polymer solution at a weight ratio of binder polymer:mixed inorganic particles of 35:65.

[0...

Embodiment 2

[0109] A separator for a lithium secondary battery was obtained in the same manner as in Example 1, except that the PVdF-HFP binder polymer pair as the first PVdF-based binder polymer was polymerized as the second PVdF-based binder The weight ratio of PVdF-TFE binder polymer was changed to 15:85.

Embodiment 3

[0111] A separator for a lithium secondary battery was obtained in the same manner as in Example 1, except that the PVdF-HFP binder polymer as the first PVdF-based binder polymer was changed to Kynar 2500 available from Arkema Corporation.

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Abstract

The present invention relates to a separator for a lithium secondary battery and a lithium secondary battery comprising the same, the separator comprising: a porous polymer substrate; and a porous coating layer positioned on at least one surface of the porous polymer substrate and including inorganic particles and a binder polymer, in which the binder polymer includes a PVdF-based binder polymer, and in X-ray diffraction (XRD) analysis, the inorganic particles have a specific surface area, and the specific surface area is at least one surface area. The PVdF-based binder polymer has a first peak at a 2 [theta] of 18.2 + / -0.2 DEG, a second peak at a 2 [theta] of 19.8 + / -0.2 DEG, and a ratio of a second peak area to a first peak area (second peak area / first peak area) is between 1.25 (inclusive) and 2.75 (exclusive). The separator for a lithium secondary battery according to the present invention has fine and uniform pores formed on the surface thereof to increase the adhesion surface area of a counter electrode, and as a result, the adhesion strength of the counter electrode is enhanced.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2019-0099817 filed in Korea on August 14, 2019. The present disclosure relates to a separator for a lithium secondary battery having improved adhesion to electrodes and resistance characteristics; and a lithium secondary battery including the same. Background technique [0002] Lithium secondary battery is an energy storage device whose basic structure is positive electrode / negative electrode / diaphragm / electrolyte, which can be charged / discharged by reversible conversion of chemical energy and electrical energy, and has high energy density. Such lithium secondary batteries are widely used in compact electronic devices such as mobile phones, notebook computers, and the like. Recently, the application of lithium secondary batteries has rapidly expanded to hybrid electric vehicles (HEV), plug-in electric vehicles (EV), electric bicycles (e-bike), and energy storage systems (ESS) in re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/46H01M10/052H01M50/409
CPCH01M50/446H01M50/46H01M10/052H01M50/449H01M50/409Y02E60/10H01M50/426H01M50/457H01M50/461H01M50/443H01M50/491H01M10/0525
Inventor 李柱成金凤泰郑吉安
Owner LG CHEM LTD
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