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Nonaqueous electrolytic secondary battery and the manufacturing method thereof

A non-aqueous electrolyte and secondary battery technology, which is applied in the manufacture of non-aqueous electrolyte batteries, secondary batteries, electrodes, etc. It can solve the problems of difficult impregnation of non-aqueous electrolytes, lower battery production efficiency, and lower battery performance, and achieve impregnability Uniformity, good safety, and the effect of reducing manufacturing costs

Inactive Publication Date: 2011-03-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with the flat portion of the flat electrode group, it is difficult for the bent portion of the flat electrode group to be impregnated with the nonaqueous electrolyte, and the time required for impregnating a required amount of the nonaqueous electrolyte increases, and the production efficiency of the battery is reduced.
Moreover, it is hard to say that there is no case where the impregnation of the non-aqueous electrolyte is insufficient and the performance of the battery deteriorates.

Method used

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  • Nonaqueous electrolytic secondary battery and the manufacturing method thereof
  • Nonaqueous electrolytic secondary battery and the manufacturing method thereof
  • Nonaqueous electrolytic secondary battery and the manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0108] Examples and comparative examples are given below to further describe the present invention.

[0109] (Example)

[0110] (1) Manufacture of positive electrode

[0111] 100 parts by weight of lithium cobaltate (positive electrode active material) and 2 parts by weight of acetylene black (conductive material) and 3 parts by weight of polyvinylidene fluoride (PVDF) dissolved in N-methyl-2-pyrrolidone (NMP) , binder) solutions are mixed to prepare positive electrode mixture slurry. On both sides of a strip-shaped aluminum foil (positive electrode current collector, 35 mm×400 mm) with a thickness of 15 μm, the positive electrode mixture slurry was intermittently coated, dried, and rolled to produce a positive electrode. The total thickness of the positive electrode active material layers on both surfaces and the positive electrode current collector was 150 μm. Then, the positive electrode was cut into a predetermined size to obtain a strip-shaped positive electrode plate....

Embodiment 2

[0122] 980g of alumina, 250g of polyacrylonitrile-modified rubber (BM-720H) and an appropriate amount of NMP were stirred in a double-arm kneader to prepare an insulating layer slurry, and cracks were formed using 3mmφ stainless steel rollers. Except for this, the prismatic lithium ion secondary battery of the present invention was produced in the same manner as in Example 1.

[0123] When the portion where the cracks formed was observed with an electron microscope, a plurality of cracks extended in the width direction of the porous insulating layer, the depth of the cracks was 100% of the thickness of the porous insulating layer, and the cross-sectional shape of the cracks was V-shaped.

Embodiment 3

[0125] The crack forming operation was not performed using a 3 mm stainless steel roller, and the wound electrode group was formed into a flat shape by pressing in a temperature environment of 0° C. In addition, a square lithium ion secondary battery of the present invention was produced in the same manner as in Example 1. .

[0126] When the portion where the cracks formed was observed with an electron microscope, a plurality of cracks extended in the width direction of the porous insulating layer, the depth of the cracks was 100% of the thickness of the porous insulating layer, and the cross-sectional shape of the cracks was V-shaped.

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Abstract

Disclosed are a nonaqueous electrolytic secondary battery and the manufacturing method thereof. The objective is to obtain a nonaqueous electrolytic secondary battery which has improved impregnation of the nonaqueous electrolyte for a flat wound electrode group, which includes a porous insulating layer containing inorganic oxide particles and a bonding agent, and little degradation of the charge-discharge cycle characteristic, ability to discharge a high voltage, and good manufacturability. In the nonaqueous electrolytic secondary battery (1), which includes a flat wound electrode group (2) and a battery case (9), and the electrode group (2) which includes a positive electrode (5), a negative electrode (6), a separator (7), and a porous insulating layer (8), at least one crack is formed in the porous insulating layer (8) present in the bent section (2a) of the electrode group (2).

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery and its manufacturing method. More specifically, the present invention mainly relates to the improvement of an electrode group included in the nonaqueous electrolyte secondary battery. Background technique [0002] Recently, with the rapid development of portable and cordless electronic equipment, a small, lightweight secondary battery with high energy density is required as a driving power source. In particular, the increasing popularity of mobile phones worldwide, as well as the addition of various functions such as camera functions, single-band transmission and reception functions, and music player functions, all make the secondary batteries used as their power sources more intensive. High capacity. Currently, as secondary batteries for electronic devices, nonaqueous electrolyte secondary batteries are becoming mainstream, and among them, lithium ion secondary batteries are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M4/04H01M4/13H01M10/0587
CPCC04B35/522C04B2235/5292C04B35/6365C04B2235/5436C04B35/532C04B2235/425Y10T29/49108Y10T29/49115Y02E60/10Y02P70/50H01M10/0587H01M10/052
Inventor 福永政雄西野肇
Owner PANASONIC CORP