Electrode film rolled web, electrode, electrode laminate, electrochemical device, and apparatus
AssigneeFujimori Kogyo Co., Ltd.
InventorsTakuo YONEDA, Mitsuru TOKURA, Yasuki HIRATA, Ayumi ANDOU, Tsutomu HAYASHI, Hisashi NAKAZAWA
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Abstract
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.
Claims16
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.
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.
Dependencies are inferred from the claim text.