Anode for secondary battery, secondary battery, battery pack, electric motor vehicle, power storage system, electric tool, and electronic device

Patent metadata

Field	Value
Publication number	US-2019348670-A1
Application number	US-201916523520-A
Country	US
Kind code	A1
Filing date	Jul 26, 2019
Priority date	Jan 31, 2017
Publication date	Nov 14, 2019
Grant date	—

Abstract

A secondary battery includes a cathode, an anode, and an electrolytic solution, in which the anode includes a plurality of first anode active material particles, a plurality of second anode active material particles, a first anode binder, and a second anode binder. The plurality of first anode active material particles include carbon, and an R value of the plurality of first anode active material particles is from 0.35 to 0.45, and a median diameter of the plurality of first anode active material particles is from 5 μm to 14.5 μm. The plurality of second anode active material particles include carbon, and the R value of the plurality of second anode active material particles is from 0.1 to 0.25, and a median diameter of the plurality of second anode active material particles is from 15 μm to 25 μm.

First claim

1 . A secondary battery comprising:
a cathode, an anode, and an electrolytic solution, wherein the anode includes a plurality of first anode active material particles, a plurality of second anode active material particles, a first anode binder, and a second anode binder, wherein the plurality of first anode active material particles include carbon, and an R value of the plurality of first anode active material particles is from 0.35 to 0.45, and a median diameter of the plurality of first anode active material particles is from 5 μm to 14. 5 μm, wherein the plurality of second anode active material particles include carbon, and an R value of the plurality of second anode active material particles is from 0.11. to 0.25, and a median diameter of the plurality of second anode active material particles is from 1.5 μm to 25 μm, wherein a ratio of a weight of the plurality of first anode active material particles to a total of the weight of the plurality of first anode active material particles and a weight of the plurality of second anode active material particles is from 10% by weight to 50% by weight, wherein the first anode binder includes one or both of styrene-butadiene rubber and a derivative of styrene-butadiene rubber, and wherein the second anode binder includes one or both of polyvinylidene fluoride and a derivative of polyvinylidene fluoride.

2 . The secondary battery according to claim 1 , wherein a ratio P (P2/P1) of a peak integrated intensity P2 resulting from (002) plane of the plurality of first anode active material particles and the plurality of second anode active material particles measured by an X-ray diffraction method to a peak integrated intensity P1 resulting from (110) planes of the plurality of first anode active material particles and the plurality of second anode active material particles measured by the X-ray diffraction method is from 36 to 42 .

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

4 . The secondary battery according to claim 1 , further comprising a separator provided between the cathode and the anode.

5 . The secondary battery according to claim 4 , wherein the separator includes one or more porous films.

6 . An anode for a secondary battery, comprising:
a plurality of first anode active material particles, a plurality of second anode active material particles, a first anode binder, and a second anode binder, wherein the plurality of first anode active material particles include carbon, and an R value of the plurality of first anode active material particles is from 0.35 to 0.45, and a median diameter of the plurality of first anode active material particles is from 5 μm to 14.5 μm, wherein the plurality of second anode active material particles include carbon, and an R value of the plurality of second anode active material particles is from 0.1 to 0.25, and a median diameter of the plurality of second anode active material particles is from 15 μm to 25 μm, wherein a ratio of a weight of the plurality of first anode active material particles to a total of the weight of the plurality of first anode active material particles and a weight of the plurality of second anode active material particles is from 10% by weight to 50% by weight, wherein the first anode binder includes one or both of styrene-butadiene rubber and a derivative of styrene-butadiene rubber, and wherein the second anode binder includes one or both of polyvinylidene fluoride and a derivative of polyvinylidene fluoride.

7 . A battery pack comprising:
a secondary battery; a controller configured to control an operation of the secondary battery; and a switch configured to switch the operation of the secondary battery according to an instruction of the controller, wherein the secondary battery includes a cathode, an anode, and an electrolytic solution, the anode includes a plurality of first anode active material particles, a plurality of second anode active material particles, a first anode binder, and a second anode binder, wherein the plurality of first anode active material particles include carbon, and an R. value of the plurality of first anode active material particles is from 0.35 to 0.45, and a median diameter of the plurality of first anode active material particles is from 5 μm to 14.5 μm, wherein the plurality of second anode active material particles include carbon, and an value of the plurality of second anode active material particles is from 0.1 to 0.25, and a median diameter of the plurality of second anode active material particles is from 15 μm to 2.5 μm, wherein a ratio of a weight of the plurality of first anode active material particles to a total of the weight of the plurality of first anode active material particles and a weight of the plurality of second anode active material particles is from 10% by weight to 50% by weight, wherein the first anode binder includes one or both of styrene-butadiene rubber and a derivative of styrene-butadiene rubber, and wherein the second anode binder includes one or both of polyvinylidene fluoride and a derivative of polyvinylidene fluoride.

8 . An electric motor vehicle comprising:
the secondary battery according to claim 1 ; a converter configured to convert power supplied from the secondary battery into a driving force; a driver configured to perform a driving operation depending on the driving force; and a controller configured to control an operation of the secondary battery.

9 . A power storage system prising:
the secondary battery according to claim 1 ; one or two or more electric devices which are configured to be supplied with power from the secondary power; and a controller configured to control supply of power from the secondary battery to the electric device.

10 . An electric tool comprising:
the secondary battery according to claim 1 ; a movable unit configured to be supplied with power from the secondary battery.

11 . An electric device comprising:
the secondary battery according to claim 1 as a power supply source.

Assignees

• Murata Manufacturing Co

Inventors

• Munaoka Takatoshi
• Ihara Masayuki
• Fujita Shigeru

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/0525

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

• H01M4/622

  being polymers · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title