Negative electrode for secondary battery, secondary battery, battery pack, electric vehicle, electric power storage system, electric tool, and electronic device

Patent metadata

Field	Value
Publication number	US-2020161701-A1
Application number	US-202016751504-A
Country	US
Kind code	A1
Filing date	Jan 24, 2020
Priority date	Jul 24, 2017
Publication date	May 21, 2020
Grant date	—

Abstract

A secondary battery includes a positive electrode, a negative electrode including a first negative electrode active material, a second negative electrode active material, and a normal temperature molten salt composition, and an electrolytic solution. The first negative electrode active material includes a first material including carbon, and the second negative electrode active material includes a second material including silicon.

First claim

1 . A secondary battery comprising:
a positive electrode; a negative electrode including a first negative electrode active material, a second negative electrode active material, and a normal temperature molten salt composition; and an electrolytic solution wherein the first negative electrode active material includes a first material including carbon, and wherein the second negative electrode active material includes a second material including silicon.

2 . The secondary battery according to claim 1 , wherein
the normal temperature molten salt composition includes at least one of a normal temperature molten salt or a copolymer of the normal temperature molten salt and a polymer compound, the normal temperature molten salt includes at least one of a quaternary ammonium cation, a quaternary phosphonium cation, a tertiary sulfonium cation, an imidazolium cation, a pyridinium cation, or a pyrrolidinium cation, and the polymer compound includes at least one of a polyacrylate salt, polyacrylic acid, polyimide, or polyvinylidene fluoride.

3 . The secondary battery according to claim 1 , wherein the normal temperature molten salt includes at least one of a bis(trifluoromethanesulfonyl)imide anion, a bis(fluorosulfonyl)imide anion, a tetrafluoroborate anion, a hexafluorophosphate anion, or a chloride anion.

4 . The secondary battery according to claim 1 , wherein the normal temperature molten salt composition includes at least one of an alkoxy group, a hydroxy group, an acryloyl group, or a methacryloyl group.

5 . The secondary battery according to claim 1 , wherein the negative electrode further includes a metal salt.

6 . The secondary battery according to claim 1 , wherein
the negative electrode further includes a negative electrode binder, and the negative electrode binder includes at least one of polyvinylidene fluoride, styrene-butadiene rubber, polyimide, a polyacrylate salt, or polyacrylic acid.

7 . The secondary battery according to claim 1 , wherein
the second negative electrode active material includes: a center portion including a silicon material; and a covering portion that is provided on a surface of the center portion and includes at least one of a polyacrylate salt, polyacrylic acid, polyvinylidene fluoride, or polyvinylpyrrolidone.

8 . The secondary battery according to claim 7 , wherein the covering portion includes the normal temperature molten salt composition.

9 . The secondary battery according to claim 8 , wherein the normal temperature molten salt composition is bonded to the silicon material.

10 . The secondary battery according to claim 8 , wherein
the negative electrode further includes a metal salt, and the covering portion includes the metal salt.

11 . The secondary battery according to claim 8 , wherein
the negative electrode further includes a negative electrode binder, the negative electrode binder includes at least one of polyvinylidene fluoride, styrene-butadiene rubber, polyimide, a polyacrylate salt, or polyacrylic acid, and the normal temperature molten salt composition is bonded to the negative electrode binder.

12 . The secondary battery according to claim 1 , wherein the secondary battery includes a lithium ion secondary battery.

13 . A negative electrode for secondary battery comprising:
a first negative electrode active material including a first material including carbon; a second negative electrode active material including a second material including silicon; and a normal temperature molten salt composition.

14 . A battery pack comprising:
a secondary battery; a controller configured to control operation of the secondary battery; and a switch configured to switch operation of the secondary battery in accordance with an instruction from the controller, wherein the secondary battery includes a positive electrode; a negative electrode including a first negative electrode active material, a second negative electrode active material, and a normal temperature molten salt composition; and an electrolytic solution, wherein the first negative electrode active material includes a first material including carbon, and wherein the second negative electrode active material includes a second material including silicon.

15 . An electric vehicle comprising:
the secondary battery according to claim 1 ; a converter configured to convert electric power supplied from the secondary battery into a driving force; a driver configured to be driven in accordance with the driving force; and a controller configured to control operation of the secondary battery.

16 . An electric power storage system comprising:
the secondary battery according to claim 1 ; one or two or more electrical apparatuses to which electric power is configured to be supplied from the secondary battery; and a controller configured to control electric power supply from the secondary battery to the electrical apparatuses.

17 . An electric tool comprising:
the secondary battery according to claim 1 ; and a moving unit to which electric power is configured to be supplied from the secondary battery.

18 . An electronic device comprising:
the secondary battery according to claim 1 as an electric power supply source.

Assignees

• Murata Manufacturing Co

Inventors

• Koike Yosuke

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/362

  Composites · CPC title

• H01M10/0525 Primary

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