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Negative electrode for nonaqueous electrolyte secondary cells, manufacturing method therefor, and nonaqueous electrolyte secondary cell

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, secondary batteries and other directions, can solve the problem of not being able to fully suppress the peeling of the negative electrode active material layer, and achieve the maintenance of battery capacity and battery. Performance, high battery capacity and battery performance, small battery swelling effect

Active Publication Date: 2011-07-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When simply adopting the negative electrode mixture slurry formed by dry mixing or wet mixing the negative electrode active material and two different binders as described in Patent Document 1 and Patent Document 2, the negative electrode active material layer cannot be sufficiently suppressed. Stripping from current collector

Method used

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  • Negative electrode for nonaqueous electrolyte secondary cells, manufacturing method therefor, and nonaqueous electrolyte secondary cell
  • Negative electrode for nonaqueous electrolyte secondary cells, manufacturing method therefor, and nonaqueous electrolyte secondary cell
  • Negative electrode for nonaqueous electrolyte secondary cells, manufacturing method therefor, and nonaqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] (1) Production of positive electrode

[0123] 100 parts by mass of LiNi 0.82 co 0.15 Al 0.03 o 2 (Positive electrode active material), 1 mass part of acetylene black (conductive agent), 1 mass part of polyvinylidene fluoride (binder), and 25 mass parts of N-methyl-2-pyrrolidone using a double-arm mixer Mix to prepare positive electrode mixture slurry. The positive electrode mixture slurry was coated on both sides of a strip-shaped aluminum foil (positive electrode current collector, 35 mm×400 mm) with a thickness of 15 μm, and then the obtained coating film was dried and rolled to prepare a positive electrode. The total thickness of the positive electrode active material layers on both surfaces and the positive electrode current collector was 120 μm. Then, the positive electrode was cut into a predetermined size to obtain a strip-shaped positive electrode plate.

[0124] (2) Production of negative electrode

[0125] The volume average particle diameter was adjust...

Embodiment 2

[0135] In addition to using polyethylene oxide instead of polyvinyl alcohol as the water-soluble polymer compound A (thermal decomposition temperature: 200 ° C, swelling degree: 12, viscosity (25 ° C) of 1 mass % aqueous solution: 1000 mPa·s), and the implementation In Example 1, a negative electrode was produced in the same manner. The tensile strength of the obtained negative electrode was 10 N / cm, and the bond strength of the negative electrode active material layer was 15 N. A nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that this negative electrode was used.

Embodiment 3

[0137] A negative electrode was fabricated in the same manner as in Example 1, except that butadiene rubber particles (thermal decomposition temperature: 350° C., volume average particle diameter: 0.3 μm) were used instead of styrene-butadiene rubber particles as the rubber binder. The tensile strength of the obtained negative electrode was 10 N / cm, and the bond strength of the negative electrode active material layer was 15 N. A nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that this negative electrode was used.

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Abstract

Disclosed is a nonaqueous electrolyte secondary cell in which a group of flat wound electrodes (10) having a positive electrode, a negative electrode and a separator, and a nonaqueous electrolyte are stored within a square battery case, wherein the negative electrode has a tensile strength of 15N / cm or less at an elongation of 1% in the lengthwise direction. The negative electrode is provided with a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer comprises (1) a negative electrode active material that expands or contracts as lithium ions are stored or released, (2) a rubber binder in which the pyrolysis temperature is equal to or greater than the softening temperature of the negative electrode current collector, (3) a water-soluble polymer compound A in which the pyrolysis temperature is equal to or greater than the softening temperature of the negative electrode current collector, and (4) a water-soluble polymer compound B in which the pyrolysis temperature is equal to or greater than the softening temperature of the negative electrode current collector, and the swelling degree relative to the nonaqueous electrolyte is lower than that of the water-soluble polymer compound A. A coating layer containing the water-soluble polymer compound A is formed on the surface of the negative electrodeactive material.

Description

technical field [0001] The present invention relates to a negative electrode for a nonaqueous electrolyte secondary battery, a manufacturing method thereof, and a nonaqueous electrolyte secondary battery. Specifically, it relates to improvement of negative electrodes for nonaqueous electrolyte secondary batteries. Background technique [0002] Nonaqueous electrolyte secondary batteries are widely used as power sources for driving electronic devices because of their high operating voltage and high energy density. In addition, recently, non-aqueous electrolyte secondary batteries have been rapidly developed for high-output applications such as power storage and electric vehicles, and some of them have been put into practical use. [0003] As a representative non-aqueous electrolyte secondary battery, a lithium ion secondary battery having a positive electrode and a negative electrode, the positive electrode containing LiCoO having a hexagonal crystal structure, a high operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/62H01M4/66H01M10/052H01M10/0587
CPCH01M4/36H01M4/366H01M4/622H01M10/052H01M4/139H01M4/621Y02T10/7011Y02E60/122H01M10/0587Y02E60/10Y10T29/49108Y10T29/49115Y02P70/50H01M4/13H01M4/62H01M4/66H01M10/05Y02T10/70
Inventor 村冈芳幸宇贺治正弥笠松真治
Owner PANASONIC CORP