Non-aqueous electrolyte secondary battery and method of manufacturing negative electrode thereof

• US 8,334,073 B2
• Filed: 09/25/2007
• Issued: 12/18/2012
• Est. Priority Date: 10/12/2006
• Status: Expired due to Fees

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Sato, Toshitada, Honda, Kazuyoshi
• Primary Examiner(s): Michener, Jennifer
• Assistant Examiner(s): CHAN, HENG M
• Application Number:
  US12/065,449
• Publication Number:
  US 20100151329A1
• Time in Patent Office: 1,911 Days
• Field of Search: 429/218.1, 429/231.9, 429/231.95, 429/233, 429/239
• US Class Current: 429/231.95
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 4/1395 of electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/382 Lithium H01M4/405 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A method of manufacturing a negative electrode includes: a first step of forming a plurality of columnar active material blocks capable of electrochemically storing and releasing lithium ions on the surface of a current collector; and a second step of disposing particulate lithium in the gaps between the active material blocks.

Claims

1. A method of manufacturing a negative electrode, the method comprising:

a first step of forming a plurality of columnar active material blocks capable of electrochemically storing and releasing lithium ions on a surface of a current collector;

a second step of producing particulate lithium by vapor deposition; and

a third step of disposing the particulate lithium produced in the second step in gaps between the active material blocks,

wherein, in the third step, a liquid dispersion in which the particulate lithium is dispersed in a dispersing medium is applied to the current collector having the active material blocks, and the applied liquid dispersion is dried.

2. A method of manufacturing a negative electrode, the method comprising:

a first step of forming a plurality of columnar active material blocks capable of electrochemically storing and releasing lithium ions on a surface of a current collector;

a second step of producing particulate lithium having a diameter of 0.3 to 15 μ

m by vapor deposition; and

a third step of disposing the particulate lithium produced in the second step in gaps between the active material blocks by a liquid dispersion in which the particulate lithium is dispersed,

wherein a lithium carbonate layer is formed on a surface of the particulate lithium before the particulate lithium is disposed in the gaps between the active material blocks.

3. The method of manufacturing a negative electrode according to claim 2,

wherein the particulate lithium on which the lithium carbonate layer is formed contains lithium at 99% or more.

4. The method of manufacturing a negative electrode according to claim 2, wherein the particulate lithium produced in the second step has a diameter of 0.3 to 15 μ

m.