Separator comprising adhesive coating parts having different tack strengths and electrode assembly comprising the same
AssigneeLG Chem, Ltd.
InventorsSung Han Jung, Ki Woong Kim, Sung Pil Yoon
Life of this patent
Estimating the term…
Abstract
The present invention relates to a jelly-roll type electrode assembly comprising: a sheet-like positive electrode; a sheet-like negative electrode; and a separator which is interposed between the positive electrode and the negative electrode, and which includes a first adhesive coating part and a second adhesive coating part formed on a first surface of a sheet-like porous substrate, and a third adhesive coating part formed on a second surface which is the opposite surface to the first surface, wherein the first adhesive coating part and the second adhesive coating part have different tack strength from each other.
Claims20
A jelly-roll type electrode assembly, comprising:
- a positive electrode in a sheet-like form;
- a negative electrode in a sheet-like form;
- and
- a separator which is interposed between the positive electrode and the negative electrode, and which comprises a first adhesive coating part and a second adhesive coating part formed on a first surface of a sheet-like porous substrate, and a third adhesive coating part formed on a second surface which is the opposite surface to the first surface,
- wherein a first pressure sensitive adhesive used as the first adhesive coating part and a second pressure sensitive adhesive used as the second adhesive coating part have different tack strengths from each other,
- wherein the adhesive in the first pressure sensitive adhesive and the adhesive in the second pressure sensitive adhesive are different from each other, and
- wherein the adhesive in the first pressure sensitive adhesive is an acrylate-based pressure sensitive adhesive, and the adhesive in the second pressure sensitive adhesive is a fluorine-based pressure sensitive adhesive.
A jelly-roll type electrode assembly, comprising:
- a positive electrode in a sheet-like form;
- a negative electrode in a sheet-like form;
- and
- a separator which is interposed between the positive electrode and the negative electrode, and which comprises a first adhesive coating part and a second adhesive coating part formed on a first surface of a sheet-like porous substrate, and a third adhesive coating part formed on a second surface which is the opposite surface to the first surface,
- wherein the first adhesive coating part and the second adhesive coating part have different tack strengths from each other,
- wherein the first pressure sensitive adhesive is an acrylate-based pressure sensitive adhesive which is a polymer of a monomer mixture comprising i) 50 to 90% by weight of a (meth)acrylic acid ester monomer having an alkyl group having 1 to 14 carbon atoms, ii) 1 to 40% by weight of one or more monomers selected from the group consisting of allyl esters, vinyl esters, unsaturated acetate and unsaturated nitrile, and iii) 0.5 to 20% by weight of one or more monomers selected from the group consisting of unsaturated carboxylic acids, based on the total weight of the monomer mixture.
A separator for a jelly-roll type electrode assembly, the separator comprising a first adhesive coating part and a second adhesive coating part formed on a first surface of a sheet-like porous substrate;
- and a third adhesive coating part formed on a second surface which is the opposite surface to the first surface,
- wherein a first pressure sensitive adhesive used as the first adhesive coating part and a second pressure sensitive adhesive used as the second adhesive coating part have different tack strengths from each other,
- wherein the adhesive in the first pressure sensitive adhesive and the adhesive in the second pressure sensitive adhesive are different from each other, and
- wherein the adhesive in the first pressure sensitive adhesive is an acrylate-based pressure sensitive adhesive, and the adhesive in the second pressure sensitive adhesive is a fluorine-based pressure sensitive adhesive.
A method of preparing a jelly-roll type electrode assembly, comprising:
- (a) a step of preparing a separator comprising a first adhesive coating part and a second adhesive coating part formed on a first surface of a sheet-like porous substrate, and a third adhesive coating part formed on a second surface which is the opposite surface to the first surface, wherein a first pressure sensitive adhesive used as the first adhesive coating part and a second pressure sensitive adhesive used as the second adhesive coating part with different tack strengths from each other,
- wherein the adhesive in the first pressure sensitive adhesive and the adhesive in the second pressure sensitive adhesive are different from each other, and
- wherein the adhesive in the first pressure sensitive adhesive is an acrylate-based pressure sensitive adhesive, and the adhesive in the second pressure sensitive adhesive is a fluorine-based pressure sensitive adhesive;
- (b) a step of stacking a positive electrode, a separator and a negative electrode so that the first adhesive coating part is positioned to face the negative electrode and the third adhesive coating part is positioned to face the positive electrode through a winding process;
- (c) winding the second adhesive coating part with a winding core brought in contact with the second adhesive coating part;
- and
- (d) separating the jelly-roll type electrode assembly from the winding core.
Dependencies are inferred from the claim text.