SEPARATOR FOR POWER STORAGE DEVICE AND POWER STORAGE DEVICE USING THE SEPARATOR

• US 20180047961A1
• Filed: 01/14/2016
• Published: 02/15/2018
• Est. Priority Date: 03/12/2015
• Status: Active Grant

• Current Assignee: Nippon Kodoshi Corporation
• Original Assignee: Nippon Kodoshi Corporation
• Inventors: IGAWA, Atsushi, WADA, Norihiro, ICHIMURA, Takumi
• Granted Patent: US 10,497,913 B2
• Time in Patent Office: Days
• CPC Class Codes: H01G 11/06 with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/58 Liquid electrolytes
• CPC Class Codes: H01G 9/02 Diaphragms; Separators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

Provided is a separator for power storage device having excellent tearing strength, denseness, and resistance performance, and a power storage device provided with the separator for power storage device. The present invention constitutes a separator for power storage device including beatable regenerated cellulose fibers, wherein a CSF value X [ml] and a tear index Y [mN·m²/g] are within the ranges satisfying the following Formulae. The present invention also constitutes a power storage device in which the separator for power storage device is used, and which is formed by interposing the separator between one pair of electrodes.

0≦X≦150  Formula 1:

10≦Y≦70  Formula 2:

Y≧0.3X−5  Formula 3:

Claims

1. A separator, comprising:

beatable regenerated cellulose fibers,

wherein a CSF value X and a tear index Y of the separator are within ranges satisfying Formulae 1 to 3;

0≦

X≦

150 

 

Formula 1;

10≦

Y≦

70 

 

Formula 2;

Y≧

0.3X−

5, 

 

Formula 3;

wherein the separator is suitable for power storage device which is interposed between a pair of electrodes and optionally holds an electrolyte-containing electrolytic solution.

2. The separator according to claim 1, wherein the CSF value X and the tear index Y are within range further satisfying Formula 4:

Y≦

0.1X+40. 

 

Formula 4;

3. The separator according to claim 2, wherein the CSF value X is within range further satisfying Formula 5:

0≦

X≦

50. 

 

Formula 5;

4. The separator according to claim 1, wherein a thickness of the separator is 10 to 80 μ

m.

5. The separator according to claim 1, wherein a density of the separator is 0.25 to 0.70 g/cm³.

6. A separator,

wherein the separator is suitable for power storage,

the separator has a multilayered structure, and

at least one separator layer is the separator according to claim 1.

7. A power storage device, comprising:

a pair of electrodes; and

the separator of claim 1 interposed between the pair of electrodes.

8. The power storage device according to claim 7, wherein the device is selected from the group consisting of an electric double-layer capacitor, a lithium-ion capacitor and a lithium-ion secondary battery.