Separator, battery, battery pack, electronic apparatus, electric vehicle, power storage device, and electric power system

Patent metadata

Field	Value
Publication number	US-2016285064-A1
Application number	US-201414777715-A
Country	US
Kind code	A1
Filing date	Feb 21, 2014
Priority date	Mar 19, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

Provided is a separator including: a substrate; and a surface layer formed on at least one surface of the substrate, and having a higher porosity than that of the substrate. It is preferable that the surface layer includes: a first layer having convexities and concavities existing as cavities; and a second layer formed between the first layer and the separator, and the second layer has a higher porosity than that of the substrate, and the first layer has a higher porosity than that of the second layer. In this case, it is preferable that the porosity of the substrate is from 25% to 40%, the porosity of the first layer is from 60% to 90%, and the porosity of the second layer is from 40% to 65%.

First claim

1 . A separator comprising:
a substrate; and a surface layer formed on at least one surface of the substrate and having a higher porosity than that of the substrate.

2 . The separator according to claim 1 , wherein the surface layer includes a first layer having convexities and concavities existing as cavities; and a second layer formed between the first layer and the substrate,
the second layer has a higher porosity than that of the substrate, and the first layer has a higher porosity than that of the second layer.

3 . The separator according to claim 2 , wherein the porosity of the first layer represents a proportion of a total of pores contained in the convexities and the cavities of the concavities with respect to entirety of the first layer.

4 . The separator according to claim 2 , wherein the porosity of the substrate is from 25% to 40%; the porosity of the first layer is from 60% to 90%; and the porosity of the second layer is from 40% to 65%.

5 . The separator according to claim 2 , wherein the first layer is formed to have a thickness equivalent to the thickness of the second layer, or to have a thickness thicker than the thickness of the second layer.

6 . The separator according to claim 1 , wherein the surface layer contains particles and a resin material, and the particles are in a state of being dispersed in the surface layer.

7 . The separator according to claim 6 , wherein the surface layer is formed such that the particles are dispersed and supported on the resin material formed in a three-dimensional network structure.

8 . The separator according to claim 6 , wherein the particles contain at least one selected from aluminum oxide, boehmite, yttrium oxide, titanium oxide, magnesium oxide, zirconium oxide, silicon oxide, zinc oxide, aluminum nitride, boron nitride, silicon nitride, titanium nitride, silicon carbide, boron carbide, barium titanate, strontium titanate, barium sulfate, a porous aluminosilicate, a layered silicate, Li 2 O 4 , Li 3 PO 4 , LiF, aluminum hydroxide, graphite, carbon nanotube, and diamond.

9 . The separator according to claim 6 , wherein the resin material includes polyvinylidene fluoride or aramid.

10 . The separator according to claim 6 , wherein the surface layer has a concavo-convex shape, and the concavo-convex shape is formed as a result of uneven distribution of the particles and the resin material.

11 . A battery comprising:
an electrode assembly having a positive electrode and a negative electrode arranged to face each other with a separator being interposed therebetween; and an electrolyte, wherein the separator includes: a substrate; and a surface layer formed on at least one surface of the substrate and has a higher porosity than that of the substrate.

12 . The battery according to claim 11 , wherein the surface layer includes a first layer having convexities and concavities existing as cavities; and a second layer formed between the first layer and the separator,
the second layer has a higher porosity than that of the substrate, and the first layer has a higher porosity than that of the second layer.

13 . The battery according to claim 11 , wherein a negative electrode active material included in the negative electrode is formed from a material containing at least one of a metal element and a semimetal element as a constituent element.

14 . A battery comprising:
an electrode assembly having a positive electrode and a negative electrode arranged to face each other with a separator being interposed therebetween; an electrolyte; and a layer having a higher porosity than that of the separator, the layer being disposed between the separator and at least one of the positive electrode and the negative electrode that are arranged to face each other with the separator interposed therebetween.

15 . A battery pack comprising:
the battery according to claim 11 ; a control unit controlling the battery; and an exterior material enclosing the battery.

16 . An electronic apparatus comprising the battery according to claim 11 , and
configured to receive supply of electric power from the battery.

17 . An electric vehicle comprising:
the battery according to claim 11 , a conversion device receiving supply of electric power from the battery and converting the electric power to the driving force for the vehicle; and a control device performing information processing in connection with vehicle control, based on information on the battery.

18 . A power storage device comprising the battery according to claim 11 , and
configured to supply electric power to an electronic apparatus connected to the battery.

19 . The power storage device according to claim 18 ,
further comprising an electric power information control device configured to transmit and receive a signal to and from another apparatus through a network, and performing charge-discharge control of the battery based on information received by the electric power information control device.

20 . An electric power system receiving supply of electric power from the battery according to claim 11 , or supplying electric power from an electric power generation device or an electric power network to the battery.

Assignees

• Sony Corp

Inventors

• Hatta Kazuhito
• Ono Toshitsugu

Classifications

• H01M10/44 Primary

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0525

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

• B60L50/10

  using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines · CPC title