IP Library › Granted Patent US 11,056,687

Granted Patent B2

US 11,056,687 · App. 16/301,057 · Granted Jul 6, 2021

Negative electrode active material, negative electrode, and battery

Inventors: Sukeyoshi Yamamoto (Tokyo, JP); Tatsuo Nagata (Tokyo, JP); Koji Moriguchi (Tokyo, JP)

Assignee: NIPPON STEEL CORPORATION

H01M4/387 B22F1/00 C22C9/02 H01M4/134 H01M4/364 H01M4/38 H01M10/0525 H01M2004/027

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Quick Facts

Patent No.: US 11,056,687
App. No.: 16/301,057
Granted: Jul 6, 2021
Kind: B2

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Abstract

A negative electrode active material is provided that is utilized in a nonaqueous electrolyte secondary battery, and that can improve the capacity per volume and charge-discharge cycle characteristics. The negative electrode active material according to the present embodiment contains an alloy having a chemical composition consisting of, in at %, Sn: 13.0 to 24.5% and Si: 3.0 to 15.0%, with the balance being Cu and impurities. The alloy particles contain a phase with a peak of the most intense diffraction line appearing in a range of 42.0 to 44.0 degrees of a diffraction angle 2θ, the most intense diffraction line being a diffraction line having the largest integrated diffraction intensity in an X-ray diffraction profile. A half-width of the most intense diffraction line of the alloy particles is in a range of 0.15 to 2.5 degrees.

Claims (55)

1. A negative electrode active material, comprising:

alloy particles having a chemical composition consisting of, in at %:

Sn: 13.0 to 24.5%, and

Si: 3.0 to 15.0%,

with the balance being Cu and impurities;

wherein:

the alloy particles contain a phase with a peak of a most intense diffraction line appearing in a range of 42.0 to 44.0 degrees of a diffraction angle 2θ, the most intense diffraction line being a diffraction line having a largest integrated diffraction intensity in an X-ray diffraction profile; and

a half-width of the most intense diffraction line of the alloy particles is in a range of 0.5 to 2.5 degrees.

2. The negative electrode active material according to claim 1 , wherein contents of Sn and Si in the chemical composition are:

Sn: 15.5 to 22.5%, and

Si: 3.0 to 9.5%.

3. The negative electrode active material according to claim 1 , wherein the chemical composition further contains, in place of a part of Cu:

one or more types of element selected from a group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Al, B and C.

4. The negative electrode active material according to claim 2 , wherein the chemical composition further contains, in place of a part of Cu:

one or more types of element selected from a group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Al, B and C.

5. The negative electrode active material according to claim 3 , wherein the chemical composition contains one or more types of element selected from a group consisting of:

Ti: 2.0% or less,

V: 2.0% or less,

Cr: 2.0% or less,

Mn: 2.0% or less,

Fe: 2.0% or less,

Co: 2.0% or less,

Ni: 3.0% or less,

Zn: 3.0% or less,

Al: 3.0% or less,

B: 2.0% or less, and

C: 2.0% or less.

6. The negative electrode active material according to claim 4 , wherein the chemical composition contains one or more types of element selected from a group consisting of: