Negative electrode for non-aqueous secondary battery, and a non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-9537139-B2
Application number	US-201113814069-A
Country	US
Kind code	B2
Filing date	Aug 3, 2011
Priority date	Aug 3, 2010
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

[Objectives] The present invention provides a non-aqueous secondary battery in which a material containing Si and O as constituent elements is used in a negative electrode. The present invention provides a non-aqueous secondary battery having good charge discharge cycle characteristics, and suppressing the battery swelling associated with the charge and the discharge. Also, the present invention relates to a negative electrode that can provide the non-aqueous secondary battery. [Solution] The negative electrode includes a negative electrode active material, including a composite of a material containing Si and O as constitution elements (atom ratio x of O to Si is 0.5≦x≦1.5) in combination with a carbon material, and graphite. The graphite has an average particle diameter dg (μm) of 4 to 20 μm. The material containing Si and O as constitution elements has an average particle diameter ds (μm) of 1 μm or more. The ratio ds/dg (i.e., ds to dg) is 0.05 to 1. The material containing Si and O as constitution elements has a crystallite diameter of 50 nm or less, the crystallite diameter is calculated from a half width at a (220) plane of Si obtained by an X-ray diffraction method, using Scherrer Formula. In 100 mass % of the composite of the material containing Si and O as constitution elements, and the carbon material, a ratio of the material containing Si and O as constitution elements is 70 to 95 mass %.

First claim

What is claimed is:

1. A negative electrode for non-aqueous secondary battery, comprising:
a negative electrode active material, comprising
a composite consisting of SiO x , wherein atom ratio x of O to Si is 0.5≦x≦1.5, and a carbon material, and
graphite, and

wherein the graphite has an average particle diameter dg (μm) of 4 to 20 μm,
wherein the SiO x has an average particle diameter ds (μm) of 1 μm or more,
wherein a ratio ds/dg is 0.05 to 1,
wherein the SiO x has a crystallite diameter of 50 nm or less, the crystallite diameter is obtained from a half width at a (220) plane of Si obtained by an X-ray diffraction method, using Scherrer Formula,
wherein in 100 mass % of the composite, a ratio of the SiO x is 70 to 95 mass %.

2. The negative electrode for non-aqueous secondary battery of claim 1 , wherein in 100 mass % of a total of the composite and the graphite, a ratio of the graphite is 70 mass % or more.

3. The negative electrode for non-aqueous secondary battery of claim 1 , wherein in the composite, the carbon material has been obtained by thermolysis when heating a hydrocarbon gas in vapor phase.

4. A non-aqueous secondary battery, comprising
a positive electrode comprising a Li-containing transition metal oxide,
a negative electrode, and
a non-aqueous electrolyte,
wherein the negative electrode is the negative electrode for non-aqueous secondary battery of claim 1 .

Assignees

• Tanaka Naokage
• Inaba Akira
• Uenae Keiichiro
• Yamada Masayuki
• Matsumoto Kazunobu
• Hitachi Maxell

Inventors

• Tanaka Naokage
• Inaba Akira
• Uenae Keiichiro
• Yamada Masayuki
• Matsumoto Kazunobu

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/364

  as mixtures · CPC title

• 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

• H01M4/131 Primary

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

• H01M4/133 Primary

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