Negative-electrode material and negative electrode for use in lithium-ion secondary battery as well as lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-9819007-B2
Application number	US-201214357413-A
Country	US
Kind code	B2
Filing date	Oct 3, 2012
Priority date	Nov 11, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A negative-electrode material has negative-electrode active-material particles including: an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and an elementary compound being capable of undergoing an alloying reaction with lithium. The negative-electrode active-material particles includes particles whose particle diameter is 1 μm or more in an amount of 85% by volume or more of them when the entirety is taken as 100% by volume, exhibit a BET specific surface area that is 6 m 2 /g or less, and exhibits a “D 50 ” that is 4.5 μm or more.

First claim

The invention claimed is:

1. A negative-electrode material for lithium-ion secondary battery being characterized in that:
the negative-electrode material comprises negative-electrode active-material particles including:
an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and
an elementary compound being capable of undergoing an alloying reaction with lithium;

said negative-electrode active-material particles including particles whose particle diameter is 1 μm or more in an amount of 85% by volume or more thereof when the entirety is taken as 100% by volume; exhibiting a BET specific surface area that is 6 m 2 /g or less; exhibiting a “D 50 ” that is 4.5 μm or more, exhibiting a “D 10 ” being 3 μm or more, and exhibiting a “D 90 ” of 10.5 μm or less.

2. The negative-electrode material for lithium-ion secondary battery as set forth in claim 1 , wherein:
said element being capable of undergoing an alloying reaction with lithium is silicon or tin; and
said elementary compound being capable of undergoing an alloying reaction with lithium is a silicon compound, or a tin compound.

3. The negative-electrode material for lithium-ion secondary battery as set forth in claim 1 , wherein said negative-electrode active-material particles exhibit a grain size falling in a range of from 0.4 μm or more to 30 μm or less.

4. The negative-electrode material for lithium-ion secondary battery as set forth in claim 1 , wherein a film is formed on a surface of said negative-electrode active-material particles.

5. The negative-electrode material for lithium-ion secondary battery as set forth in claim 1 , wherein:
the BET specific surface area of said negative-electrode active-material particles is 5 m 2 /g or less;
the “D 50 ” of said negative-electrode active-material particles is from 5.0 μm or more to 8.0 μm or less; and
said negative-electrode active-material particles exhibit a grain size falling in a range from 0.4 μm or more to 20 μm or less.

6. The negative-electrode material for lithium-ion secondary battery as set forth in claim 5 , wherein the “D 50 ” of said negative-electrode active-material particles is from 5.7 μm or more to 7.2 μm or less.

7. The negative-electrode material for lithium-ion secondary battery as set forth in claim 5 , wherein the BET specific surface area of said negative-electrode active-material particles is from 2.5 m 2 /g or more to 5.0 m 2 /g or less.

8. The negative-electrode material for lithium-ion secondary battery as set forth in claim 5 , wherein said negative-electrode active-material particles exhibit a “D 90 ” being so large to exceed 8.0 μm.

9. The negative-electrode material for lithium-ion secondary battery as set forth in claim 1 , wherein said negative-electrode active-material particles comprise SiO x (where 0.5≦“x”≦1.5).

10. A negative-electrode material for lithium-ion secondary battery being characterized in that:
the negative-electrode material comprises negative-electrode active-material particles including:
an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and
an elementary compound being capable of undergoing an alloying reaction with lithium;

said negative-electrode active-material particles including particles whose particle diameter is 1 μm or more in an amount of 85% by volume or more thereof when the entirety is taken as 100% by volume; exhibiting a BET specific surface area that is 6 m 2 /g or less, exhibiting a “D 10 ” being 3 μm or more, and exhibiting a “D 90 ” of 10.5 μm or less.

11. A negative electrode for lithium-ion secondary battery, the negative electrode comprising the negative-electrode material as set forth in claim 1 .

12. A negative electrode for lithium-ion secondary battery, the negative electrode comprising the negative-electrode material as set forth in claim 10 .

13. A lithium-ion secondary battery being characterized in that:
the lithium-ion secondary battery comprises:
the negative electrode as set forth in claim 11 ;
a positive electrode including a positive-electrode active material that enables lithium ions to be sorbed therein and desorbed therefrom; and

an electrolyte.

14. A lithium-ion secondary battery being characterized in that:
the lithium-ion secondary battery comprises:
the negative electrode as set forth in claim 12 ;
a positive electrode including a positive-electrode active material that enables lithium ions to be sorbed therein and desorbed therefrom; and

an electrolyte.

15. A negative-electrode material for lithium-ion secondary battery being characterized in that:
the negative-electrode material comprises negative-electrode active-material particles including:
an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and
an elementary compound being capable of undergoing an alloying reaction with lithium;

said negative-electrode active-material particles exhibiting a BET specific surface area that is 6 m 2 /g or less; exhibiting a “D 50 ” that is from 4.5 μm or more to 8.0 μm or less; exhibiting a grain size that falls in a range of from 0.4 μm or more to 30 μm or less, exhibiting a “D 10 ” being 3 μm or more, and exhibiting a “D 90 ” of 10.5 μm or less.

16. The negative-electrode material for lithium-ion secondary battery as set forth in claim 15 , wherein:
said element being capable of undergoing an alloying reaction with lithium is silicon or tin; and
said elementary compound being capable of undergoing an alloying reaction with lithium is a silicon compound, or a tin compound.

17. The negative-electrode material for lithium-ion secondary battery as set forth in claim 15 , wherein the “D 50 ” of said negative-electrode active-material particles is from 5.7 μm or more to 7.2 μm or less.

18. The negative-electrode material as set forth in claim 15 , wherein said negative-electrode active-material particles include particles whose particle diameter is 1 μm or more in an amount of 85% by volume or more thereof when the entirety is taken as 100% by volume.

19. The negative-electrode material for lithium-ion secondary battery as set forth in claim 15 , wherein the BET specific surface area of said negative-electrode active-material particles is from 2.5 m 2 /g or more to 5.0 m 2 /g or less.

20. The negative-electrode material for lithium-ion secondary battery as set forth in claim 15 , wherein said negative-electrode active-material particles exhibit a “D 90 ” being so large to exceed 8.0 μm.

21. The negative-electrode material for lithium-ion secondary battery as set forth in claim 15 , wherein said negative-electrode active-material particles comprise SiO x (where 0.5≦“x”≦1.5).

22. A negative-electrode material for lithium-ion secondary battery being characterized in that:
the negative-electrode stuff comprises negative-electrode active-material particles including:
an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and
an elementary compound being capable of undergoing an alloying reaction with lithium;

said negative-electrode active-material particles exhibiting a “D 50 ” that is from 4.5 μm or more to 8.0 μm or less; and exhibiting a grain size that falls in a range of from 0.4 μm or more to 30 μm or less, exhibiting a “D 10 ” bein

Assignees

• Toyota Jidoshokki Kk

Inventors

• Hirakawa Yuichi
• Miyoshi Manabu
• Shinoda Hideaki
• Kato Takayuki
• Hayashi Keiichi
• Mizuno Kayo
• Kawabata Yoshikatsu
• Yamamoto Megumi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/70

  characterised by shape or form · CPC title

• H01M4/0409

  by a doctor blade method, slip-casting or roller coating · CPC title

• H01M2300/004

  Three solvents · CPC title