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Non-aqueous electrolyte secondary battery and producing method of electrode

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte battery electrodes, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve problems such as unfavorable metal particles, mixing into batteries, and unfavorable return of active materials to electrodes

Active Publication Date: 2009-03-04
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The active material is detached from the active material layer which is in contact with the guide roller etc. during the electrode original sheet running, and a part of the detached active material is unfavorably attached back to the surface of the electrode, or in the process for placing the stacked electrodes on the battery case Metal particles caused by the step are unfavorably mixed into the battery

Method used

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  • Non-aqueous electrolyte secondary battery and producing method of electrode
  • Non-aqueous electrolyte secondary battery and producing method of electrode
  • Non-aqueous electrolyte secondary battery and producing method of electrode

Examples

Experimental program
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Effect test

no. 1 approach

[0025] (1-1) Structure of secondary battery

[0026] figure 1 is a sectional view showing a structural example of the nonaqueous electrolyte secondary battery according to the first embodiment of the present invention. This nonaqueous electrolyte secondary battery is of a so-called cylindrical type, and has a spirally wound electrode body 20 in a substantially hollow cylindrical battery case 11 . The spirally wound electrode body 20 includes a strip-shaped positive electrode 21 , a strip-shaped negative electrode 22 , and a separator 23 disposed between the positive electrode and the negative electrode, wherein they are spirally wound together. A porous protective film is formed on one or both of the surface of the positive electrode and the surface of the negative electrode. The separator 23 is impregnated with an electrolytic solution as an electrolyte. The battery can 11 is made of, for example, iron (Fe) plated with nickel (Ni), and has one closed end and the other open...

no. 2 approach

[0066] (2-1) Structure of secondary battery

[0067] Figure 4 is a perspective view showing a structural example of a nonaqueous electrolyte secondary battery according to a second embodiment of the present invention. In this nonaqueous electrolyte secondary battery, a spirally wound electrode body 30 on which a positive electrode lead 31 and a negative electrode lead 32 are mounted is housed in a film-like package 40 . Therefore, the size, weight, and thickness of the battery can be easily reduced.

[0068] The positive electrode lead 31 and the negative electrode lead 32 are electrically drawn out in the same direction from the inside to the outside of the package 40 , for example. Both the cathode lead 31 and the anode lead 32 are composed of a metal material such as aluminum (Al), copper (Cu), nickel (Ni) or stainless steel, and are in the form of a thin plate or mesh.

[0069] The package 40 is composed of, for example, a rectangular aluminum laminated film in which a...

Embodiment 1～7

[0083] First, a negative electrode was prepared as follows. 98 parts by mass of soft graphite as a negative electrode active material and 2 parts by mass of styrene-butadiene rubber (SBR) as a binder were mixed together to prepare a negative electrode mixture. The obtained negative electrode mixture was dispersed in ion-exchanged water as a solvent to prepare negative electrode mixture slurry. Next, this anode mixture slurry was applied to both surfaces of a strip-shaped copper foil having a thickness of 8 μm as an anode current collector and dried. Then, the negative electrode active material layer thus formed was press-molded by means of a press to prepare a belt-shaped negative electrode.

[0084] Next, alumina powder having an average particle diameter of about 0.3 μm, PVdF as a binder, lithium dodecyl sulfate as a surfactant, and N-methylpyrrolidone as a solvent were mixed together to obtain Microparticle slurries with viscosities in the range of 0.1 Pa·sec to 3.5 Pa·se...

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Abstract

The present invention discloses a non-aqueous electrolyte secondary battery and electrode manufacturing method thereof. The non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, an electrolyte, and a porous protective film formed on either one or both surfaces of the positive and negative electrodes. The porous protective film includes a binder, fine particles, and a surfactant. The battery according to the invention has high reliability and can prevent the generation of inner physical short circuit caused by the exposure of electrode surface.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Patent Application No. 2007-221043 filed with the Japan Patent Office on August 28, 2007, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to a nonaqueous electrolyte secondary battery and an electrode manufacturing method. Background technique [0004] In recent years, with the advancement of electronic technology, various electronic devices have been improved in performance and further reduced in size and may be portable. As a result, the demand for batteries with higher energy density for such electronic devices has increased. As secondary batteries for electronic devices, aqueous electrolyte secondary batteries such as nickel-cadmium batteries and lead batteries have been used. These secondary batteries have a low terminal voltage when discharged and are not suitable for obtaining high energy density. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/40H01M4/04H01M4/13H01M4/139H01M50/574H01M50/586H01M50/593
CPCH01M10/058H01M4/139H01M4/13H01M4/62H01M2/34H01M2200/00Y02E60/122Y02E60/10Y02P70/50H01M50/574H01M50/593H01M50/586H01M10/0587
Inventor 只野纯一
Owner MURATA MFG CO LTD