LITHIUM-ION SECONDARY CELL

• US 20110223455A1
• Filed: 02/17/2011
• Published: 09/15/2011
• Est. Priority Date: 03/09/2010
• Status: Abandoned Application

• Current Assignee: Hitachi Vehicle Energy, Ltd.
• Original Assignee: Hitachi Vehicle Energy, Ltd.
• Inventors: KIMURA, Naoki, Eguchi, Takashi, Ueda, Atsushi, Maruyama, Akihiko, Koseki, Mitsuru, Yagi, Yoshin, Ishizu, Takenori, Ariga, Toshiyuki
• Application Number:
  US13/029,153
• Publication Number:
  US 20110223455A1
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/666 in the form of mixed materials H01M4/668 takes precedence
• CPC Class Codes: H01M 4/745 Expanded metal
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• 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
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A lithium-ion secondary cell includes a winding electrode assembly. The exposed area of the positive-electrode metal current collector body is formed at one end in a winding axis direction of the winding electrode assembly, and the exposed area of the negative-electrode metal current collector body is formed at another end in the winding axis direction of the winding electrode assembly; and the negative-electrode metal current collector body is a copper foil rolled to a thickness between 6 μm and 15 μm in which one or more of additive elements of Zr, Ag, Au, Pt, Cr, Cd, Sn, Sb, and Bi are added to Cu having a purity of equal to or greater than 99.9%, and the negative-electrode active material mix layer has a cavity volume ratio of between 30% and 60%.

Claims

1. A lithium-ion secondary cell, comprising:

winding electrode assembly that comprises;

positive-electrode plate in which a positive-electrode active material mix layer is disposed on both sides of a positive-electrode metal current collector body and an exposed area of the positive-electrode metal current collector body is provided along one of long sides of the positive-electrode plate;

negative-electrode plate in which a negative-electrode active material mix layer is disposed on both sides of a negative-electrode metal current collector body and an exposed area of the negative-electrode metal current collector body is provided along one of long sides of the negative-electrode plate; and

separator arranged between the positive-electrode plate and the negative-electrode plate, wherein;

the exposed area of the positive-electrode metal current collector body is formed at one end in a winding axis direction of the winding electrode assembly, and the exposed area of the negative-electrode metal current collector body is formed at another end in the winding axis direction of the winding electrode assembly; and

the negative-electrode metal current collector body is a copper foil rolled to a thickness between 6 μ

m and 15 μ

m in which one or more of additive elements of Zr, Ag, Au, Pt, Cr, Cd, Sn, Sb, and Bi are added to Cu having a purity of equal to or greater than 99.9%, and the negative-electrode active material mix layer has a cavity volume ratio of between 30% and 60%.

2. A lithium-ion secondary cell according to claim 1, wherein:

the exposed area of the positive-electrode metal current collector body is between 1 mm and 20 mm wide in the winding axis direction, and the exposed area of the negative-electrode metal current collector body is between 1 mm and 20 mm wide in the winding axis direction .

3. A lithium-ion secondary cell according to claim 1, wherein:

the negative-electrode metal current collector body is formed by rolling oxygen-free copper.

4. A lithium-ion secondary cell according to claim 1, wherein:

the winding electrode assembly is flat-shaped, and the flat-shaped winding electrode assembly is housed in a flat prismatic cell case.

5. A lithium-ion secondary cell according to claim 1, wherein:

the winding electrode assembly is cylindrical-shaped, and the cylindrical-shaped winding electrode assembly is housed in a cylindrical cell case.