Separator including glass layer covering polyolefin resin layer having a three-dimensional mesh framework, and battery using the same

Patent metadata

Field	Value
Publication number	US-9627669-B2
Application number	US-201313889006-A
Country	US
Kind code	B2
Filing date	May 7, 2013
Priority date	Jul 6, 2007
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A separator which includes a covering layer in which a fine framework of polyolefin resin is coated with a glass layer and an exposed layer in which the polyolefin resin is exposed is provided. A battery is provided having a cathode and an anode, an electrolyte, and a separator where the separator has the covering layer in which the fine framework of polyolefin resin is coated with the glass layer.

First claim

The invention claimed is:

1. A separator comprising:
a resin layer including a framework of porous polyolefin resin,
wherein the resin layer includes a covering layer portion extending only partially through a thickness of the resin layer, where the framework of the covering layer portion is coated by a glass layer, the glass having a SiO 4 tetrahedral structure phase of the SiO bond,
wherein the glass layer is formed by applying a precursor viscous liquid polysilazane compound to the framework of the polyolefin resin such that the glass layer is impregnated only through the covering layer portion and without extending through a remaining portion of the resin layer.

2. The separator according to claim 1 , wherein the glass layer is formed by
applying to the resin layer as a precursor, a viscous liquid product which contains only the polysilazane compound having a liquid property without solvent or a mixture of viscous liquid product which contains only the polysilazane compound with a polycarbosilazane compound having a repeating unit which is represented by Chemical Formula 2, wherein Rs are hydrogen or an alkyl group, and n is greater than 1

placing the polyolefin resin and precursor into a water bath; and
drying the resulting product.

3. The separator according to claim 2 , wherein at least one of the side chains R of the polysilazane compound is an alkyl group.

4. A battery comprising:
a cathode;
an anode;
an electrolyte; and
a separator;
wherein the separator includes
a resin layer including a framework of porous polyolefin resin,

wherein the resin layer includes a covering layer portion extending only partially through a thickness of the resin layer, where the framework of the covering layer portion is coated by a glass layer, the glass having a SiO 4 tetrahedral structure phase of the SiO bond,
wherein the glass layer is formed by applying a precursor viscous liquid polysilazane compound to the framework of the polyolefin resin such that the glass layer is impregnated only through the covering layer portion and without extending through a remaining portion of the resin layer.

5. The battery according to claim 4 , wherein an organic solvent is used as a solvent of the electrolyte.

6. The battery according to claim 5 , wherein an open circuit voltage in a full charge state is within a range of 4.2 V to 4.6 V.

Assignees

• Sony Corp

Inventors

• Kajita Atsushi
• Teshima Yukako
• Imoto Hiroshi
• Tanaka Takehiko
• Horiuchi Hiroshi

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/423

  Polyamide resins · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title