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

Patent metadata

Field	Value
Publication number	US-9819008-B2
Application number	US-201615370532-A
Country	US
Kind code	B2
Filing date	Dec 6, 2016
Priority date	Nov 11, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A negative electrode for lithium-ion secondary battery including a negative electrode that includes a current collector; and a negative-electrode active-material layer formed on a surface of the current collector, and including negative-electrode active-material particles. The negative-electrode active-material particles include 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 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, and exhibit a “D 10 ” being 3 μm or more. The negative-electrode active-material layer having a thickness that is 1.4 times or more of a “D 90 ” that said negative-electrode active-material particles exhibit.

First claim

The invention claimed is:

1. A negative electrode for lithium-ion secondary battery being characterized in that:
the negative electrode comprises:
a current collector; and
a negative-electrode active-material layer formed on a surface of the current collector, and including negative-electrode active-material particles;

said negative-electrode active-material particles comprising:
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;
said negative-electrode active-material particles exhibit a “D 10 ” being 3 μm or more, and a “D 90 ” of 10.5 μm or less, and
said negative-electrode active-material layer having a thickness that is 1.4 times or more of a “D 90 ” that said negative-electrode active-material particles exhibit.

2. The negative electrode for lithium-ion secondary battery as set forth in claim 1 , wherein the thickness of said negative-electrode active-material layer is three times or more of a “D 10 ” that said negative-electrode active-material particles exhibit.

3. The negative electrode for lithium-ion secondary battery as set forth in claim 1 , wherein a ratio of a “D 50 ,” which said negative-electrode active-material particles exhibit, with respect to the “D 90 ,” which said negative-electrode active-material particles exhibit, is from 0.5 or more to 0.8 or less.

4. The negative electrode for lithium-ion secondary battery as set forth in claim 1 , wherein a fraction of said negative-electrode active-material particles' mass is from 20% or more to 90% or less when said negative-electrode active-material layer's entire mass is taken as 100%.

5. The negative electrode 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.

6. A lithium-ion secondary battery comprising:
the negative electrode for lithium-ion secondary battery as set forth in claim 1 ;
a positive electrode including a positive-electrode active material that enables lithium ions to be sorbed therein and desorbed therefrom; and
an electrolyte.

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/0409

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

• H01M2300/004

  Three solvents · CPC title