Separator for lithium secondary battery having improved electrode adhesion strength and resistance characteristics, and lithium secondary battery including same

A lithium secondary battery, a technology of a separator applied to a separator for a lithium secondary battery having improved electrode adhesion strength and resistance characteristics, and a lithium secondary battery including the separator for a lithium secondary battery In the field of secondary batteries, it can solve the problems of unfavorable and unfavorable adhesion, and achieve the effect of increasing the surface area of ​​adhesion, improving adhesion and excellent life.

Pending Publication Date: 2022-03-11
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, it is known that PVDF-based polymers with excellent adhesion are disadvantageous in terms of electrical resistance, and PVDF-based polymers with superior electrical resistance characteristics are disadvantageous in terms of adhesion

Method used

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  • Separator for lithium secondary battery having improved electrode adhesion strength and resistance characteristics, and lithium secondary battery including same
  • Separator for lithium secondary battery having improved electrode adhesion strength and resistance characteristics, and lithium secondary battery including same
  • Separator for lithium secondary battery having improved electrode adhesion strength and resistance characteristics, and lithium secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Preparation of compositions for forming porous coatings

[0118] As inorganic particles, the average particle diameter D was prepared 50 500nm Al 2 o 3 powder.

[0119] As the adhesive, two types of PVDF-based adhesives were prepared. Specifically, the first adhesive is a PVDF-TFE adhesive (commercially available as VT-475 from Daikin) with an elastic-dominated rheological behavior, wherein when the adhesive is pressed at 190° C. For an adhesive sample having a thickness of 0.4 mm, the adhesive sample has a temperature range of 15° C. to 27.6 mm as determined by Dynamic Mechanical Analysis (DMA) using a DMAQ800 available from TA Instruments. tanδ peak at °C. In addition, the second adhesive is a PVDF-HFP adhesive (available as Solef 21510 from Solvay) with a viscosity-dominated rheological behavior, wherein when the adhesive is pressed at 190° C. When formed into adhesive coupons having a thickness of 0.4 mm, the adhesive coupons have a temperature range between...

Embodiment 2

[0131] A composition for forming a porous coating was prepared in the same manner as in Example 1, except that Al was prepared at a weight ratio of 70:5:25 2 o 3powder, first binder, and second binder. The composition was controlled to have a solids content of 20 wt%.

[0132] Then, a porous polymer substrate is prepared, and the composition is applied to one surface of the substrate to obtain a separator for a lithium secondary battery, the separator is formed on one surface of the porous polymer substrate and includes a mixture of Porous coating with binder of inorganic particles. The total coating weight of the porous coating is 5.6g / m 2 .

Embodiment 3

[0134] A composition for forming a porous coating was prepared in the same manner as in Example 1, except that Al was prepared in a weight ratio of 70:2:24:4 2 o 3 powder, a first binder, a second binder, and a third binder, and the third binder is introduced together with the first binder and the second binder during preparation of the binder composition. The composition was controlled to have a solids content of 20 wt%. Here, PVDF-CTFE (Solef 32008 available from Solvay) was used as the third binder.

[0135] Meanwhile, when the third adhesive, that is, PVDF-CTFE (Solef 32008 available from Solvay) was formed into an adhesive sample with a thickness of 0.4 mm by pressing at 190° C., the adhesive sample Samples were analyzed by Dynamic Mechanical Analysis (DMA) using a DMA Q800 available from TA Instruments. The adhesive sample was shown to have a tan delta peak at -7.56°C.

[0136] Then, a porous polymer substrate is prepared, and the composition is applied to one surfac...

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Abstract

The present invention provides a separator for a lithium secondary battery having excellent adhesion strength and air permeability, the separator for a lithium secondary battery comprising: a porous polymer substrate; and a porous coating layer including inorganic particles and a binder, in which when the binder is prepared into a binder sample having a thickness of 0.4 mm by pressurization at 190 DEG C, the binder sample includes a first binder having a tan delta peak at 15 DEG C to 27.6 DEG C and a second binder having a tan delta peak at 8 DEG C to 20.2 DEG C, as determined by dynamic mechanical analysis (DMA).

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2019-0135852 filed in Korea on October 29, 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 separator for a lithium secondary battery. Background technique [0002] Lithium secondary batteries are energy storage devices having a basic structure of positive electrode / negative electrode / separator / electrolyte, and are electrochemical devices that can be charged / discharged by reversible conversion between chemical energy and electrical energy and exhibit high energy density . These lithium secondary batteries are widely used in compact electronic devices such as mobile phones, notebook computers, or the like. Recently, the application of lithium secondary batteries has been rapidly expanded to hybrid electric vehicles (HEV), plug-in el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/426H01M10/0525H01M50/403H01M50/449H01M50/46H01M50/491
CPCH01M50/403H01M50/426H01M50/449H01M50/491H01M50/461H01M10/0525H01M10/052H01M50/446H01M50/457H01M50/46H01M50/443Y02E60/10H01M50/451H01M50/431
Inventor 金凤泰李柱成郑吉安
Owner LG ENERGY SOLUTION LTD
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