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Porous film for separator, battery separator, battery electrode, and manufacturing methods therefor, and lithium secondary battery

The technology of a porous membrane and a manufacturing method is applied in the field of porous membranes for separators, separators for batteries, electrodes for batteries, and the manufacture of these and secondary lithium batteries, which can solve problems such as short circuits

Inactive Publication Date: 2011-05-11
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned separator commonly used at present tends to shrink when the temperature in the battery is very high, and there is a problem that a short circuit occurs due to this.

Method used

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  • Porous film for separator, battery separator, battery electrode, and manufacturing methods therefor, and lithium secondary battery
  • Porous film for separator, battery separator, battery electrode, and manufacturing methods therefor, and lithium secondary battery
  • Porous film for separator, battery separator, battery electrode, and manufacturing methods therefor, and lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment approach 1

[0025] First, the porous membrane for a separator and its manufacturing method, the battery separator and its manufacturing method, the battery electrode and its manufacturing method of this invention are demonstrated.

[0026] The porous membrane forming the battery separator of the present invention (hereinafter simply referred to as "separator") is a porous membrane formed by containing inorganic oxide particles and binding the above-mentioned inorganic oxide particles with a binder. As the above-mentioned inorganic oxide particles, the alkali metal element contained in the above-mentioned porous film, especially Na, is a film having a concentration of 1000 ppm or less (mass basis, the same below).

[0027] Even among the alkali metal elements contained in the separator, the alkali metal elements that exist in a water-elutable state, especially Na, cause the characteristics of the secondary lithium battery to deteriorate during long-term repeated charging and discharging or ...

Embodiment approach 2

[0103] Next, the secondary lithium battery of the present invention will be described.

[0104] As long as the secondary lithium battery of the present invention uses the battery separator of the present invention, other configurations and structures are not particularly limited, and configurations and structures used in conventional secondary lithium batteries can be applied.

[0105] Examples of the form of the secondary lithium battery include a cylindrical shape (square or cylindrical) in which a steel can, an aluminum can, or the like is used as an exterior can. In addition, it may be a soft-package battery in which a metal-deposited laminated film is used as an exterior body.

[0106] The positive electrode is not particularly limited as long as it is a positive electrode used in conventional secondary lithium batteries, that is, a positive electrode containing an active material capable of absorbing and releasing Li ions. For example, as the positive electrode active m...

Embodiment 1

[0126] Diaphragm production

[0127] Plate-shaped boehmite (aspect ratio: 10) was repeatedly washed with water and dried at 120° C. as inorganic oxide particles. Put 0.5g of dried platy boehmite on 25cm 3 The ion-exchanged water was soaked at 25°C for 12 hours, the soaked ion-exchanged water was diluted 10 times, and the amount of alkali metal elements dissolved in the ion-exchanged water was measured by ICP spectroscopic analysis. As a result, the alkali metal element basically consisted of only Na, and the amount thereof was determined to be 500 ppm based on the weight of platy boehmite.

[0128] To 500 g of the platy boehmite washed with water, 500 g of ion-exchanged water and 5 g of a 40% by mass ammonium polycarboxylate dispersant were added, and dispersion treatment was performed with a ball mill to prepare a dispersion. The particle size of the platy boehmite in the dispersion liquid was measured with a laser scattering particle size distribution meter, and the averag...

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Abstract

Disclosed is a lithium secondary battery, wherein inorganic oxide particles, in which the amount of elution of alkali metal elements during immersion in ion exchange water is lowered to less than 1000 ppm, are bound by a binder to form a porous membrane, and a separator comprising the porous membrane is used to construct the lithium secondary battery. Thus, a lithium secondary battery which has high reliability and little degradation in the characteristics thereof during long-term use and long-term storage can be provided.

Description

technical field [0001] The present invention relates to a porous membrane for a separator for constituting a secondary lithium battery having excellent dimensional stability at high temperature and little deterioration in characteristics during long-term use or storage, a method for producing the same, and a battery including the porous membrane for a separator. A separator for a separator and a method for producing the same, an electrode for a battery comprising the porous membrane for a separator and a method for producing the same, and a secondary lithium battery using the separator for a battery or the electrode for a battery described above. Background technique [0002] A secondary lithium battery, which is a typical battery using a non-aqueous electrolyte, is widely used as a power source for portable devices such as mobile phones and notebook computers due to its high energy density. Since an electrolytic solution (non-aqueous electrolytic solution) containing chemic...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/04H01M10/36H01M50/414H01M50/434
CPCH01M4/13H01M10/052Y02E60/10H01M50/414H01M50/434H01M50/446H01M50/443H01M50/449H01M50/491H01M50/463H01M50/403Y02P70/50
Inventor 阿部浩史阿部敏浩松本修明片山秀昭
Owner HITACHT MAXELL LTD
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