Negative electrode material for lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-10892482-B2
Application number	US-201314438285-A
Country	US
Kind code	B2
Filing date	Oct 25, 2013
Priority date	Oct 26, 2012
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A negative electrode material for a lithium ion secondary battery includes a silicon oxide and having a diffraction peak attributable to Si (111) in an X-ray diffraction spectrum, in which a size of a silicon crystallite calculated from the diffraction peak is from 2.0 nm to 8.0 nm.

First claim

The invention claimed is:

1. A lithium ion secondary battery, comprising:
a positive electrode;
a negative electrode for a lithium ion secondary battery comprising a current collector, and a negative electrode material layer provided on the current collector, the negative electrode material layer comprising a negative electrode material (SiOx-C) comprising:
a silicon oxide represented by a formula SiOx (x is 0<+≤2) having silicon crystallite present and having a diffraction peak attributable to Si (111) in an X-ray diffraction spectrum,
wherein a size of silicon crystallite calculated from the diffraction peak is from 2.0 nm to 8.0 nm,
wherein the silicon oxide further comprises carbon on a part of a surface thereof or the entire surface thereof,
wherein the carbon has an R value in a Raman spectrum of from 0.5 to 1.5, and
wherein a content ratio of the carbon is 0.5% by mass or more and less than 5.0% by mass; and

an electrolyte,
wherein the negative electrode material layer further comprises a carbonaceous negative electrode material (C), and a ratio of the negative electrode material (SiOx-C) to the carbonaceous negative electrode material (C) is from 1:99 to 10:90 in terms of mass.

2. The lithium ion secondary battery according to claim 1 , wherein the carbon is provided on a part of the surface of the silicon oxide.

3. The lithium ion secondary battery according to claim 1 , wherein the carbon is provided on the entire surface of the silicon oxide.

4. The lithium ion secondary battery according to claim 1 , wherein the R value of the carbon in the Raman spectrum is from 0.7 to 1.3.

5. The lithium ion secondary battery according to claim 1 , wherein the R value of the carbon in the Raman spectrum is from 0.8 to 1.2.

6. The lithium ion secondary battery according to claim 1 , wherein the R value of the carbon in the Raman spectrum is from 0.7 to 1.5.

7. The lithium ion secondary battery according to claim 1 , wherein the R value of the carbon in the Raman spectrum is from 0.8 to 1.5.

8. The lithium ion secondary battery according to claim 1 , wherein the R value of the carbon in the Raman spectrum is from 0.5 to 1.3.

9. The lithium ion secondary battery according to claim 1 , wherein the R value of the carbon in the Raman spectrum is from 0.5 to 1.2.

10. The lithium ion secondary battery according to claim 1 , wherein a size of a silicon crystallite calculated from the diffraction peak is from 2.0 nm to 6.0 nm.

11. The lithium ion secondary battery according to claim 1 , wherein the content ratio of the carbon is 0.5% by mass to 4.5% by mass.

12. The lithium ion secondary battery according to claim 1 , wherein a size of a silicon crystallite calculated from the diffraction peak is from 2.0 nm to 5.0 nm.

13. The lithium ion secondary battery according to claim 1 , wherein a size of a silicon crystallite calculated from the diffraction peak is from 3.0 nm to 8.0 nm.

14. The lithium ion secondary battery according to claim 1 , wherein a size of a silicon crystallite calculated from the diffraction peak is from 4.0 nm to 8.0 nm.

Assignees

• Hitachi Chemical Co Ltd
• Showa Denko Materials Co Ltd

Inventors

• Kouzu Masayuki
• Tsuchiya Hideyuki
• Ohzeki Katsutomo
• Oosaki Yoshie
• Nishida Tatsuya

Classifications

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/131

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

• H01M4/625

  Carbon or graphite · CPC title