Anode for use in a lithium-ion secondary battery, and lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-9263733-B2
Application number	US-201013496761-A
Country	US
Kind code	B2
Filing date	Sep 22, 2010
Priority date	Sep 25, 2009
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

A negative electrode for a lithium ion secondary battery including an active material layer that is disposed on a current collector and that contains a negative electrode active material and a binder, in which the negative electrode active material includes an alloy active material and a carbon active material, and the weight ratio between the alloy active material and the carbon active material in the active material layer is 20:80 to 50:50, and the binder contains 0.1 to 15 wt % of an ethylenically unsaturated carboxylic acid monomer polymerization unit.

First claim

The invention claimed is:

1. A negative electrode for a lithium ion secondary battery comprising: a current collector; and an active material layer which is disposed on the current collector and which contains a negative electrode active material and a binder, wherein:
the negative electrode active material includes an alloy active material and a carbon active material, the alloy active material comprises SiO x C y , wherein 0<x≦3 and 0<y≦5, or silicon, and a weight ratio between the alloy active material and the carbon active material in the active layer is 20:80 to 50:50, and
the binder contains 0.1 to 15 wt % of an ethylenically unsaturated carboxylic acid monomer polymerization unit.

2. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the active material layer further includes 1 to 20 parts by weight of a conductive material based on 100 parts by weight of the active material.

3. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the binder has a glass transition temperature of 25° C. or lower.

4. The negative electrode for a lithium ion secondary battery according to claim 1 , wherein the active material layer has a density of 1.6 to 1.9 g/cm3.

5. A slurry for a lithium ion secondary battery negative electrode comprising a negative electrode active material, a binder, and a solvent wherein:
the negative active material includes an alloy active material and a carbon active material,
the alloy active material comprises SiO x C y wherein 0<x≦3 and 0<y≦5 or silicon,
a weight ratio between the alloy active material and the carbon active material is 20:80 to 50:50, and
the binder contains 0.1 to 15 wt % of an ethylenically unsaturated carboxylic acid monomer polymerization unit.

6. A lithium secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution, wherein the negative electrode is the negative electrode for a lithium ion secondary battery according to claim 1 .

Assignees

• Wakizaka Yasuhiro
• Kobayashi Kei
• Zeon Corp

Inventors

• Wakizaka Yasuhiro
• Kobayashi Kei

Classifications

• H01M4/1393

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

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/621

  Binders · CPC title

• H01M10/0525

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

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title