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-11228025-B2
Application number	US-201916523520-A
Country	US
Kind code	B2
Filing date	Jul 26, 2019
Priority date	Jan 31, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

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

The invention claimed is:

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 0.1 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,
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.

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

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

4. The secondary battery according to claim 3 , wherein the separator includes one or more porous films.

5. 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.

6. A power storage system comprising:
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.

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

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

9. 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,
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.

10. 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 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,
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.

Assignees

• Murata Manufacturing Co

Inventors

• Munaoka Takatoshi
• Ihara Masayuki
• Fujita Shigeru

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/622

  being polymers · CPC title

• H01M2004/021

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

• H01M10/0525

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

• H01M4/364 Primary

  as mixtures · CPC title