BIPOLAR ELECTRODE, BIPOLAR SECONDARY BATTERY USING THE SAME AND METHOD FOR MANUFACTURING BIPOLAR ELECTRODE

• US 20130122362A1
• Filed: 07/21/2011
• Published: 05/16/2013
• Est. Priority Date: 07/28/2010
• Status: Active Application

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Ohta, Yasuo, Horie, Hideaki, Sato, Masanobu, Aoyagi, Masanori
• Granted Patent: US 10,283,774 B2
• Time in Patent Office: Days
• US Class Current: 429/210
• CPC Class Codes: H01M 10/0418 with bipolar electrodes
• 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 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0409 by a doctor blade method, slip-casting or roller coating
• CPC Class Codes: H01M 4/0435 Rolling or calendering
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/583 Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A bipolar electrode is composed of a first active material layer which is, for example, a positive electrode active material layer formed to include a first active material on one side of a collector, and a second active material layer which is, for example, a negative electrode active material layer formed to include a second active material with less compressive strength than that of the first active material on the other side of the collector. Then, a density adjusting additive which is an additive material with larger compressive strength than that of the second active material is included in the second active material layer.

Claims

1-10. -10. (canceled)

11. A bipolar electrode comprising:

a first active material layer formed to include a first active material on one side of a collector; and

a second active material layer formed to include a second active material with less compressive strength than that of the first active material on the other side of the collector, the first active material layer and the second active material layer being subjected to press working for density adjustment, wherein

for reduction of a difference between elongation of the first active material layer and elongation of the second active material layer resulting from the pressing working for density adjustment, an additive material with larger compressive strength than that of the second active material is included in at least the second active material layer out of the first active material layer and the second active material layer.

12. The bipolar electrode according to claim 11, wherein the additive material has a larger particle diameter than the second active material.

13. The bipolar electrode according to claim 11, wherein compressive strength of the additive material is equal to that of the first active material.

14. The bipolar electrode according to claim 11, wherein compressive strength of the additive material is larger than that of the first active material.

15. The bipolar electrode according to claim 11, wherein the additive material can be used as an active material by itself.

16. A bipolar secondary battery using the bipolar electrode according to claim 11.

19. The bipolar electrode according to claim 11, wherein the press working for density adjustment is applied to the first active material layer formed on one side of the collector and the second active material layer formed on the other side of the collector.

20. The bipolar electrode according to claim 11, wherein an additive material with larger compressive strength than that of the second active material is included only in the second active material layer.

17. A method for manufacturing a bipolar electrode comprising:

a process to apply a slurry including a first active material on one side of a collector;

a process to apply, on the other side of the collector, a slurry obtained by mixing a second active material with less compressive strength than that of the first active material and an additive material with larger compressive strength than that of the second active material; and

a process to press the collector with the slurries applied on both sides thereof.

18. The method for manufacturing the bipolar electrode according to claim 17, wherein a particle diameter of the additive material with larger compressive strength than that of the second active material is set to be equal to a design value of the thickness of a second active material layer.