Separator, electrode group, secondary battery, battery pack, vehicle, and stationary power supply

Patent metadata

Field	Value
Publication number	US-2021091358-A1
Application number	US-202016883331-A
Country	US
Kind code	A1
Filing date	May 26, 2020
Priority date	Sep 19, 2019
Publication date	Mar 25, 2021
Grant date	—

Abstract

A separator includes an inorganic particle layer including an inorganic particle, a polymeric binder and a fiber substance. A mass ratio of the fiber substance with respect to a total mass of the inorganic particle, the polymeric binder and the fiber substance is 0.1 mass % or more and 40 mass % or less.

First claim

What is claimed is:

1 . A separator comprising:
an inorganic particle layer including an inorganic particle, a polymeric binder and a fiber substance, wherein a mass ratio of the fiber substance with respect to a total mass of the inorganic particle, the polymeric binder and the fiber substance is 0.1 mass % or more and 40 mass % or less.

2 . The separator according to claim 1 , wherein the mass ratio of the fiber substance is 0.5 mass % or more and 30 mass % or less.

3 . The separator according to claim 1 , wherein an average fiber diameter of the fiber substance is 1 nm or more and 100 nm or less.

4 . The separator according to claim 1 , further comprising a porous free-standing film disposed on a main surface of the inorganic particle layer.

5 . The separator according to claim 1 , wherein the inorganic particle include at least one of NASICON type LATP (Li 1+x Al x Ti 2-x (PO 4 ) 3 ), Li 1+x Al x Ge 2-x (PO 4 ) 3 , Li 1+x Al x Zr 2−x (PO 4 ) 3 (0.1≤x≤0.5), amorphous LIPON (Li 2.9 PO 3.3 N 0.46 ), or garnet type LLZ (Li 7 La 3 Zr 2 O 12 ).

6 . The separator according to claim 1 , wherein the polymeric binder includes a part composed of a monomer unit comprising a hydrocarbon having a functional group containing at least one element selected from the group consisting of oxygen (O), sulfur (S), nitrogen (N), and fluorine (F), and a ratio of the part composed of the monomer unit is 70 mol % or more.

7 . An electrode group comprising: a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and the separator according to claim 1 disposed at least between the positive electrode and the negative electrode.

8 . The electrode group according to claim 7 , wherein the negative electrode active material includes a compound having a lithium ion adsorption/desorption potential of 1 V or more and 3 V or less (vs. Li/Li + ) as a potential based on metal lithium.

9 . The electrode group according to claim 7 , wherein the positive electrode active material includes a compound having a lithium ion adsorption/desorption potential of 2.5 V or more and 5.5 V or less (vs. Li/Li + ) as a potential based on metal lithium.

10 . A secondary battery comprising: the electrode group according to claim 7 and an aqueous electrolyte.

11 . A battery pack comprising the secondary battery according to claim 10 .

12 . The battery pack according to claim 11 , further comprising an external terminal for energization and a protection circuit.

13 . The battery pack according to claim 11 , comprising a plurality of the secondary batteries, wherein the plurality of secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

14 . A vehicle comprising the battery pack according to claim 11 .

15 . A stationary power supply comprising the battery pack according to claim 11 .

Assignees

• Toshiba Kk

Inventors

• Uno Wataru
• Hotta Yasuyuki
• Matsuno Shinsuke
• Takami Norio

Classifications

• H01M50/449

  having a layered structure · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/44

  Fibrous material · CPC title

• H01M2300/0002

  Aqueous electrolytes · CPC title

• H01M50/446 Primary

  Composite material consisting of a mixture of organic and inorganic materials · CPC title