Anode binder material for lithium secondary battery, and anode binder comprising cured product thereof

A technology for rechargeable batteries and adhesives, applied in the field of 0003] The present invention relates to the field, and can solve problems such as side reactions, anode degradation, and inability to compensate for volume changes in anode active materials

Pending Publication Date: 2021-10-01
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, generally known anode binders (such as styrene-butadiene polymers, styrene-acrylate polymers, etc.) are denatured at high temperatures (up to 200°C) during battery manufacturing, Or cause a side reaction with the electrolyte in the battery, and the adhesive force becomes weak during repeated charging and discharging of the battery, therefore, the volume change of the anode active material cannot be compensated, thereby deteriorating the anode

Method used

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  • Anode binder material for lithium secondary battery, and anode binder comprising cured product thereof
  • Anode binder material for lithium secondary battery, and anode binder comprising cured product thereof
  • Anode binder material for lithium secondary battery, and anode binder comprising cured product thereof

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0147]61 g of butadiene, 57 g of styrene, and 2 g of acrylic acid were added as monomers to water containing 0.5% by weight of the polymerization initiator p-menthane hydroperoxide (PMHP), and 10 g of sodium lauryl sulfate was added as emulsified agents, and mixed them, and then polymerized at 70°C for about 5 hours to obtain a composition comprising butadiene-styrene-acrylic polymer particles.

[0148] The solids content in the composition was 30% by weight, and the polymer particles contained therein had a number average particle diameter of 50 nm (measured by a dynamic light scattering (DLS) device).

Embodiment 1

[0150] (1) Anode binder material (acrylic-styrene-butadiene polymer+sulfur+Zn(BDC)+DCBS+ZnO)

[0151] Get 20g of the composition of Preparation Example 1, and add 0.2g of sulfur (S 8 ), 0.4g of Zn(BDC) (wherein, BDC = 1,4-phthalate), 0.2g of DCBS (N,N-dicyclohexyl-2-benzothiazole sulfenamide) and 0.7g ZnO was then stirred for 1 hour to obtain the anode binder material of Example 1.

[0152] (2) anode

[0153] 150 g of a thickener, an aqueous carboxymethylcellulose solution (solid content: 1.5% by weight) and 1.5 g of a conductive agent acetylene black were mixed and stirred for 1 hour to prepare a conductive agent dispersion.

[0154] Take 0.5 g of the anode binder material of Example 1 and introduce it into the conductive agent dispersion, and introduce 150 g of the anode active material artificial graphite (D50: 20 μm) and 20 g of distilled water thereinto and stir to prepare the anode binder material of Example 1. Anode active material slurry.

[0155] Using a copper fo...

Embodiment 2

[0160] (1) Anode binder material (acrylic-styrene-butadiene polymer+sulfur+Zn(BDC)+DCBS+ZnO)

[0161] Get 20g of the composition of Preparation Example 1, and add 0.2g of sulfur (S 8 ), 0.4g of Zn(BDC), 0.1g of DCBS and 0.7g of ZnO, and then stirred for 1 hour to obtain the anode binder material of Example 2.

[0162] (2) Preparation of anode and lithium-ion half-cell

[0163] An anode and a lithium ion half cell of Example 2 were prepared by the same method as in Example 1, except that the anode binder material of Example 2 was used instead of the binder composition of Example 1.

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Abstract

The objective of the present invention is to provide, as a prerequisite for improving the performance of a lithium secondary battery, a material that can be converted into an anode binder having all of heat resistance, chemical resistance, excellent binding force, durability and the like. Specifically, provided in one implementation embodiment of the present invention is an anode binder material for a lithium secondary battery, comprising: a vulcanization accelerator comprising a metal-organic framework (MOF); a styrene-butadiene copolymer; and a sulfur molecule (S8).

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2019-0138185 filed with the Korean Intellectual Property Office on October 31, 2019 and Korean Patent Application No. 10-2020 filed with the Korean Intellectual Property Office on October 13, 2020 -0131978, the disclosures of both patent applications are hereby incorporated by reference in their entirety. [0003] The present invention relates to an anode binder material for a lithium rechargeable battery, and an anode binder comprising a cured product of the anode binder material. Background technique [0004] Recently, as the fields of application of lithium rechargeable batteries have expanded from small electronic devices to large devices such as automobiles, power storage systems, etc., various studies are being conducted to improve the performance of lithium rechargeable batteries, such as increasing energy capacity and ensuring rapid cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/058H01M10/052
CPCH01M4/622H01M4/13H01M10/058H01M10/052Y02E60/10H01M4/133H01M10/0525H01M4/621H01M4/0404H01M4/0471H01M2004/027Y02P70/50C08F236/10C08K5/42C08K5/46C08K5/56C08K13/02C08K2003/2296C09D147/00
Inventor 李诚镇孙祯晚柳东彫韩善姬韩正燮康旼阿禹贞恩崔哲勋
Owner LG CHEM LTD
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