ELECTRODE FILM ROLLED WEB, ELECTRODE, ELECTRODE LAMINATE, ELECTROCHEMICAL DEVICE, AND APPARATUS
The present invention relates to a novel electrode film rolled web for use as a material for an electrode, an electrode, an electrode laminate, an electrochemical device, and an apparatus for which such an electrode film rolled web is used as a material.
1 . An electrode film rolled web comprising a mixture including an active material and a binder, wherein the electrode film rolled web satisfies the following (1) to (3):
(1) a breaking strength determined by the following measurement method is 0.35 MPa or more, and an elongation percentage is 3% or more at the breaking strength:
(Measurement Method) a strength of 75% of a maximum stress is defined as breaking strength, when a test piece obtained by cutting the electrode film rolled web into a size of 15 mm in width and 50 mm in length is measured under conditions of inter-chuck distance: 30 mm and tensile speed: 100 mm/min;
(2) the binder contains a styrene butadiene rubber, a polyvinylidene fluoride, and a polycarboxylic acid polymer; and
(3) the binder satisfies all of the following content ratios with respect to the whole mixture:
Total amount of binder: more than 1.8% by mass and 6.5% by mass or less;
Styrene butadiene rubber: more than 0.6% by mass and 1.5% by mass or less; and
Polycarboxylic acid polymer: 0.4% by mass or more and 2.6% by mass or less.
2 . The electrode film rolled web according to claim 1 , wherein the mixture includes a conductive material in an amount of 2% by mass or more and 5% by mass or less with respect to the whole mixture.
3 . The electrode film rolled web according to claim 1 , wherein the polycarboxylic acid polymer is a poly(meth)acrylic acid.
4 . The electrode film rolled web according to claim 1 , wherein a release film is laminated.
5 . An electrode comprising the electrode film rolled web according to claim 1 as a material.
6 . An electrode laminate
wherein the electrode according to claim 5 , and
a separator or a solid electrolyte membrane are laminated.
7 . An electrochemical device comprising the electrode laminate according to claim 6 .
8 . An apparatus comprising the electrochemical device according to claim 7 .
9 . An electrode film rolled web comprising an active material layer including, as a material, a mixture including an active material and a binder, and
comprising no current collector,
wherein the electrode film rolled web satisfies the following (1) to (3):
(1) a breaking strength determined by the following measurement method is 0.35 MPa or more, and an elongation percentage is 3% or more at the breaking strength:
(Measurement Method) a strength of 75% of a maximum stress is defined as breaking strength, when a test piece obtained by cutting the electrode film rolled web into a size of 15 mm in width and 50 mm in length is measured under conditions of inter-chuck distance: 30 mm and tensile speed: 100 mm/min;
(2) the binder contains a styrene butadiene rubber, a polyvinylidene fluoride, and a polycarboxylic acid polymer; and
(3) the binder satisfies all of the following content ratios with respect to the whole mixture:
Total amount of binder: more than 1.8% by mass and 6.5% by mass or less;
Styrene butadiene rubber: more than 0.6% by mass and 1.5% by mass or less; and
Polycarboxylic acid polymer: 0.4% by mass or more and 2.6% by mass or less.
10 . The electrode film rolled web according to claim 9 , wherein the mixture includes a conductive material in an amount of 2% by mass or more and 5% by mass or less with respect to the whole mixture.
11 . The electrode film rolled web according to claim 9 , wherein the polycarboxylic acid polymer is a poly(meth)acrylic acid.
12 . The electrode film rolled web according to claim 9 , wherein a release film is laminated.
13 . An electrode comprising the electrode film rolled web according to claim 9 as a material.
14 . An electrode laminate
wherein the electrode according to claim 13 , and
a separator or a solid electrolyte membrane are laminated.
15 . An electrochemical device comprising the electrode laminate according to claim 14 .
16 . An apparatus comprising the electrochemical device according to claim 15 .