Non-aqueous electrolyte secondary battery and method of manufacturing the same

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte storage batteries, electrolyte storage battery manufacturing, battery electrodes, etc., can solve the problems of energy density reduction, achieve the reduction of discharge load characteristics, excellent storage stability, and improve The effect of saving properties

Inactive Publication Date: 2010-08-18
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems in that when the slurry is applied to the positive electrode, the solvent or binder diffuses into the inside of the electrode, the binder in the positive electrode swells, and the energy density decreases

Method used

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  • Non-aqueous electrolyte secondary battery and method of manufacturing the same
  • Non-aqueous electrolyte secondary battery and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] [Formation of positive electrode]

[0052] As the positive electrode active material, lithium cobaltate in which 1.0 mol % of Al and Mg were solid-dissolved and 0.05 mol % of Zr was produced was produced. The positive electrode active material, acetylene black as a carbon conductive agent, and PVDF (polyvinylidene fluoride) were mixed in a mass ratio of 95:2.5:2.5, and NMP was used as a solvent by using a mixer to prepare a positive electrode slurry. This was applied to both sides of an aluminum foil, dried, and then rolled to produce a positive electrode. It should be noted that the packing density of the positive electrode is set at 3.60g / cm 3 .

[0053] It should be noted that, as the positive electrode active material, a positive electrode active material having a layered structure can be used. Among them, lithium-containing transition metal oxides having a layered structure are preferably used. In addition, when the charge termination potential of the positive ...

Embodiment 2

[0077] A battery was fabricated in the same manner as in Example 1 except that sodium polyacrylate was added at 0.50 parts by mass with respect to 100 parts by mass of the inorganic particles. Let this battery be battery T2.

Embodiment 3

[0079] A battery was fabricated in the same manner as in Example 1, except that sodium polyacrylate was added as a dispersion stabilizer in an amount of 0.10 parts by mass relative to 100 parts by mass of the inorganic particles. Let this battery be battery T3.

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Abstract

An inorganic particle layer, provided on a surface of a positive electrode, containing inorganic particles, a dispersion stabilizer made of at least one of a polyacrylic acid and a polyacrylate, and a water-system binder that is different from the dispersion stabilizer. A non-aqueous electrolyte secondary battery that has the inorganic particle layer, a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a non-aqueous electrolyte, and a separator provided between the positive electrode and the negative electrode.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery and a manufacturing method thereof. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs has rapidly progressed, and further increases in capacity are required for batteries as their driving power sources. Furthermore, these mobile information terminals are being enriched with functions such as video playback and game functions, and power consumption tends to increase. Therefore, there is a strong demand for high capacity and high performance such as long-time regeneration and output improvement in lithium ion secondary batteries as driving power sources. [0003] Here, the theoretical capacity of lithium cobaltate generally used as the positive electrode active material of a lithium ion secondary battery is about 273mAh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/62H01M10/058
CPCY02E60/122H01M2004/028H01M4/622H01M4/62H01M4/366Y02E60/10Y10T29/49115Y02P70/50
Inventor 南博之井町直希
Owner SANYO ELECTRIC CO LTD
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