SEPARATOR CAPABLE OF SELECTIVE ION MIGRATION, AND SECONDARY BATTERY COMPRISING SAME

• US 20180151861A1
• Filed: 05/09/2016
• Published: 05/31/2018
• Est. Priority Date: 05/29/2015
• Status: Active Grant

• Current Assignee: Rekrix Co., Ltd.
• Original Assignee: Rekrix Co., Ltd.
• Inventors: RYOU, Byoung Hoon, KONG, Jae Kyung
• Granted Patent: US 10,461,295 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/02 Details of electrodes H01M4/00; of non-active parts H01M50/00
• CPC Class Codes: H01M 10/05 Accumulators with non-aqueous electrolyte H01M10/39 takes precedence
• CPC Class Codes: H01M 10/24 Alkaline accumulators
• CPC Class Codes: H01M 12/06 with one metallic and one gaseous electrode
• CPC Class Codes: H01M 12/08 composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
• CPC Class Codes: H01M 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/463 Separators, membranes or diaphragms characterised by their shape
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A separator includes a support formed in a grid, and a porous ion migration inhibition layer with which the grid of the support is coated and which has a plurality of pores formed therein, wherein each of the plurality of pores of the porous ion migration inhibition layer is formed to have a size smaller than the size of an electromigration-promoting ion contained in an electrolyte, whereby the electromigration-promoting ion does not pass through the porous ion migration inhibition layer. In addition, potassium is prevented from migrating to the carbon layer, thereby preventing potassium hydroxide from being precipitated even when oxygen is moved to a positive electrode side during charging. Furthermore, when the separator is applied to a separator of an alkaline battery, potassium hydroxide may be prevented from being precipitated during charging, thereby achieving an effect that an alkaline primary battery can be used as a secondary battery.

Claims

1. :

A separator capable of selective ion migration, comprising;

a support formed in a grid; and

a porous ion migration inhibition layer with which the grid of the support is coated and which has a plurality of pores formed therein,

wherein each of the plurality of pores of the porous ion migration inhibition layer is formed so as to have a size smaller than the size of an electromigration-promoting ion contained in an electrolyte, and thus the electromigration-promoting ion is prevented from passing through the porous ion migration inhibition layer.

2. :

The separator according to claim 1, wherein the support is formed of polyvinyl alcohol (PVA), and the porous ion migration inhibition layer is formed of polyvinyl acetate (PVAc).

3. :

The separator according to claim 2, wherein the porous ion migration inhibition layer is formed by an electrospinning process of electrically charging polyvinyl acetate (PVAc) and spinning the polyvinyl acetate (PVAc) onto the support.

4. :

The separator according to claim 2, wherein the porous ion migration inhibition layer is formed by substituting polyvinyl acetate (PVAc) with at least one alkali metal or alkaline earth metal.

6. :

A secondary battery, comprising;

a positive electrode;

a negative electrode;

the separator of claim 1, the separator interposed between the positive electrode and the negative electrode; and

the electrolyte for partially impregnating the negative electrode, the separator, and the positive electrode.

5. :

A secondary battery, comprising;

a positive electrode;

a negative electrode;

a separator interposed between the positive electrode and the negative electrode; and

an electrolyte for partially impregnating the negative electrode, the separator and the positive electrode, the electrolyte comprising an electromigration-promoting ion,

wherein the separator is formed of a porous material having a plurality of pores formed therein, and each of the plurality of pores has a size smaller than the size of an electromigration-promoting ion contained in the electrolyte, and thus the electromigration-promoting ion does not pass through the plurality of pores such that the electromigration-promoting ion is prevented from migrating to the positive electrode side.