Non-aqueous electrolyte secondary battery

• US 9,093,704 B2
• Filed: 11/19/2008
• Issued: 07/28/2015
• Est. Priority Date: 11/26/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Yokoyama, Tomohiko, Takezawa, Hideharu, Fujikawa, Masato, Kasamatsu, Shinji
• Primary Examiner(s): Takeuchi, Yoshitoshi
• Application Number:
  US12/596,762
• Publication Number:
  US 20100136428A1
• Time in Patent Office: 2,442 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• 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 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• 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 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• 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

The non-aqueous electrolyte secondary battery of the present invention is provided with an electrode plate group and a non-aqueous electrolyte, the electrode plate group including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, a positive electrode lead connected to the positive electrode, and a negative electrode lead connected to the negative electrode. The energy density of the electrode plate group is 750 Wh/L or higher by volume, and the cross-sectional area of at least one of the positive electrode lead and the negative electrode lead is 5.5×10⁻⁵ to 1.2×10⁻² cm².

Claims

1. A non-aqueous electrolyte secondary battery comprising

an electrode plate group and

a non-aqueous electrolyte,

wherein said electrode plate group comprises:

a positive electrode;

a negative electrode;

a separator interposed between said positive electrode and said negative electrode;

a positive electrode lead connected to said positive electrode; and

a negative electrode lead connected to said negative electrode,

said negative electrode comprises

a negative electrode active material layer and

a negative electrode current collector,

said negative electrode active material layer comprises a material comprising at least one member selected from the group consisting of silicon and tin; and

said negative electrode active material layer formed on said negative electrode current collector, and

the ratio of the cross-sectional area of said negative electrode lead relative to the volume of said negative electrode current collector is 1.0×

10<sup>−

4</sup> to 7.0×

10<sup>−

3</sup> (cm²/cm³),

said electrode plate group has an energy density of not less than 750 Wh/L by volume, and

at least one of said positive electrode lead and said negative electrode lead is in a strip form, and has a uniform width and a uniform cross-sectional area of 5.5×

10<sup>−

5</sup> to 1.2×

10<sup>−

2</sup> cm², both in a longitudinal direction of the entire at least one of said positive electrode lead and said negative electrode lead.

2. The non-aqueous electrolyte secondary battery in accordance with claim 1,

wherein said negative electrode active material layer comprises a plurality of columnar particles comprising said negative electrode active material, and said columnar particle is grown from a surface of said negative electrode current collector in a direction vertical to said surface of said negative electrode current collector or in a direction tilted from said vertical direction.

3. The non-aqueous electrolyte secondary battery in accordance with claim 2, wherein said columnar particle comprises a stacking body comprising a plurality of particle layers.

4. The non-aqueous electrolyte secondary battery in accordance with claim 3, wherein each of said particle layers grows in a different direction.

5. The non-aqueous electrolyte secondary battery in accordance with claim 3, wherein the growing directions of said plurality of particle layers comprising said stacking body are tilted from a normal direction of said surface of said current collector, alternately in a first direction and a second direction.

6. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said material comprises at least one member selected from the group consisting of a simple silicon substance, a silicon alloy, a compound comprising silicon and oxygen, and a compound comprising silicon and nitrogen.

7. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said material comprises at least one selected from the group consisting of a simple tin substance, a tin alloy, and a compound comprising tin and oxygen.