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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem of hard deposits at the bottom of the container, to delay the condensation and deposits, adhesion Excellent, stability-enhancing effect

Inactive Publication Date: 2010-06-16
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technology disclosed in JP-A-2004-63423 does not deal with the suppression of the coagulation of the adhesive derived from polyacrylonitrile, for example, which occurs at the bottom of the container just after a long time has elapsed after the preparation of the coating solution. Hard deposits (as described in embodiments of the invention)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12 and Embodiment 15

[0086]Using NMP as a solvent, natural or artificial graphite made of a carbon-based material (the specific surface area (SA) of which is shown in Table 1) as a negative electrode active material, PAN as a binder, and polymer A according to this invention PVP (polyvinylpyrrolidone), PEO (polyethylene oxide), or PAA (polyacrylic acid) of the functional polymer of the invention embodiment is uniformly mixed, thereby obtaining a slurry for the negative electrode. Each addition amount shown in Table 1 represents a ratio to the negative electrode mixture. Example 13-14

Embodiment 13-14

[0087] Using NMP as a solvent, natural graphite made of a carbon-based material (the specific surface area (SA) of which is shown in Table 1) as a negative electrode active material, PAN as a binder, and PVP as a polymer A and as a polymer The PVDF of substance B was uniformly mixed, thereby obtaining the negative electrode slurry. Each addition amount shown in Table 1 represents a ratio to the negative electrode mixture.

[0088] The negative electrode paste thus obtained was evaluated as follows.

[0089] (stability)

[0090] Collect 100 mL of the slurry into a 100 mL plastic cup and determine the degree of settling after 10 hours.

[0091] A: No deposit was formed.

[0092] B: Viscosity slightly increased.

[0093] C: Hard deposits were formed on the bottom of the container.

[0094] (adhesiveness)

[0095] The slurry was coated on a copper foil and dried at 120°C by a hot air dryer; a pressure-sensitive double-sided tape was bonded to the negative electrode active ma...

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Abstract

A negative electrode mixture is provided and includes: a negative electrode active material containing a carbon based material; a binder containing at least a polyacrylonitrile based resin; and a polymer capable of suppressing an intermolecular interaction between cyano groups and imparting a steric hindrance.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. In particular, the present invention relates to a negative electrode mixture, a negative electrode, and a nonaqueous electrolyte secondary battery including the negative electrode, which have satisfactory adhesion to a collector and can exhibit high charge and discharge characteristics. Background technique [0002] In general, an electrode used for a lithium ion secondary battery or the like has a structure in which an electrode material layer is provided over a current collector made of metal or the like. A method of manufacturing an electrode generally includes applying a coating solution having at least one active material and a binder dispersed or dissolved in the solution on a current collector and allowing it to dry. Such a manufacturing method has high industrial productivity because electrodes having a large area can be manufactured at one time. [0003] When carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M10/0525H01M4/133H01M4/1393H01M4/62
CPCH01M4/621Y02E60/122H01M10/0525H01M4/587H01M4/0404Y02E60/10H01M4/02H01M4/04H01M4/62H01M10/05
Inventor 伊藤博友古贺景三村上隆
Owner SONY CORP
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