Current collector, negative electrode and battery

Patent metadata

Field	Value
Publication number	US-9350050-B2
Application number	US-68784807-A
Country	US
Kind code	B2
Filing date	Mar 19, 2007
Priority date	Mar 30, 2006
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A current collector includes a first principal plane and a second principal plane. In the current collector, the roughness of the first principal plane and second principal plane being mutually different.

First claim

What is claimed is:

1. A battery comprising:
a positive electrode and a negative electrode spirally wound to form a wound body;
an electrolyte;
a negative current collector of the negative electrode having (a) a first principal plane facing outward and corresponding to an outer face of the wound body and (b) a second principal plane facing inward and corresponding to an inner face of the wound body, and
an active material layer comprising Si or Sn on at least one of the first principal plane and the second principal plane of the negative current collector,
wherein,
a surface roughness of the first principal plane of the negative current collector is higher than a surface roughness of the second principal plane of the negative current collector, and
the surface roughness of the first principal plane is in a range of 0.2 μm to 3.0 μm both inclusive.

2. A battery according to claim 1 , wherein:
the active material layer on the negative current collector includes the first principal plane and the second principal plane; and
one of the first principal plane and the second principal plane has a thickness of 80 μm or more at full discharge.

3. A battery according to claim 1 , wherein the active material layer on the negative current collector exhibits a volume change of 10% or more at full charge and full discharge.

4. A battery according to claim 1 , wherein at least part of the active material layer is alloyed with the negative current collector.

5. The battery according to claim 1 wherein the negative current collector has a thickness of about 5 μm to 30 μm, both inclusive.

6. The battery according to claim 1 wherein the difference between the surface roughness of the first principal plane and the second principal plane is equal to or greater than 0.05 μm.

Assignees

• Kawase Kenichi
• Konishiike Isamu
• Takada Tomoo
• Iwama Masayuki
• Morita Nozomu
• Kato Yoshikazu
• Sony Corp

Inventors

• Kawase Kenichi
• Konishiike Isamu
• Takada Tomoo
• Iwama Masayuki
• Morita Nozomu
• Kato Yoshikazu

Classifications

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M4/745

  Expanded metal · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic