Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10038186-B2
Application number	US-201514878624-A
Country	US
Kind code	B2
Filing date	Oct 8, 2015
Priority date	May 8, 2002
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

The present invention provides a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode having a negative active material, and a non-aqueous electrolyte, characterized in that the negative active material contains composite particle (C), which has silicon-containing particle (A) and electronic conductive additive (B), the silicon-containing particle (A) has a content of carbon, and when measured at a temperature rising rate of 10±2° C./min by thermogravimetry, said composite particle (C) exhibits two stages of weight loss in the range of 30 to 1000° C.

First claim

What is claimed is:

1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
a non-aqueous electrolyte,
wherein the negative electrode contains a negative active material,
the negative active material contains a composite particle (C),
the composite particle (C) contains a silicon-containing particle (A) and an electron-conductive additive (B),
the electron-conductive additive (B) covers the surface of the silicon-containing particle (A),
the silicon-containing particle (A) comprises SiO, a microcrystalline silicon phase and an amorphous SiO 2 matrix phase, and
the microcrystalline silicon phase is dispersed in the amorphous SiO 2 matrix phase in the silicon-containing particle (A).

2. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the weight of the electron-conductive additive (B) falls within the range of 0.5 wt. % to 60 wt. % of the composite particle (C).

3. The non-aqueous electrolyte secondary battery according to claim 1 , the composite particles further containing carbon and the silicon-containing particle (A) and carbon are coated by the electron-conductive additive (B).

4. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the electron-conductive additive (B) contains a carbon material having an average interplanar spacing d(002) of 0.3354 nm or more and less than 0.34 nm.

5. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the silicon-containing particle (A) consists of the SiO, the microcrystalline silicon phase and the amorphous SiO 2 matrix phase.

6. The non-aqueous electrolyte secondary battery according to claim 5 , wherein the composite particle (C) consists of the silicon-containing particle (A) and the electron-conductive additive (B).

7. The non-aqueous electrolyte secondary battery according to claim 5 , wherein the composite particle (C) consists of the silicon-containing particle (A) and the electron-conductive additive (B), and the electron-conductive additive (B) is carbon.

8. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the electron-conductive additive (B) is carbon.

9. A non-aqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
a non-aqueous electrolyte,
wherein the negative electrode contains a negative active material,
the negative active material contains a composite particle (C),
the composite particle (C) comprises a silicon-containing particle (A) covered with an electron-conductive additive (B) on a surface of the silicon-containing particle (A),
the silicon-containing particle (A) comprises SiO x (0<x<2), a microcrystalline silicon phase and an amorphous SiO 2 matrix phase, and
the microcrystalline silicon phase is dispersed in the amorphous SiO 2 matrix phase in the silicon-containing particle (A).

10. The non-aqueous electrolyte secondary battery according to claim 1 , wherein in the composite particle (C), a layer of electron-conductive additive (B) covers the surface of the silicon-containing particle (A).

11. The non-aqueous electrolyte secondary battery according to claim 1 , wherein at least one of half widths of the Si (111)-plane and Si (220)-plane diffraction peaks of the silicon-containing particle (A) in X-ray diffraction measurement with CuKα radiation is less than 3° (2θ).

12. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the negative active material further contains a carbon material (D).

13. The non-aqueous electrolyte secondary battery according to claim 9 , wherein the negative active material further contains a carbon material (D).

14. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the silicon-containing particle (A) comprises equimolar amounts of Si and O.

15. The non-aqueous electrolyte secondary battery according to claim 14 , wherein the silicon-containing particle (A) is made by calcinating SiO and separating SiO into the microcrystalline silicon phase and the amorphous SiO 2 matrix phase.

16. The non-aqueous electrolyte secondary battery according to claim 9 , wherein the silicon-containing particle (A) comprises equimolar amounts of Si and O.

Assignees

• Tabuchi Toru
• Aoki Toshiyuki
• Teshima Minoru
• Nishie Katsushi
• Gs Yuasa Int Ltd

Inventors

• Tabuchi Toru
• Aoki Toshiyuki
• Teshima Minoru
• Nishie Katsushi

Classifications

• H01M4/48 Primary

  of inorganic oxides or hydroxides · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M10/0525

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