Title:
応力緩和層を有するリチウム二次電池
Document Type and Number:
Japanese Patent JP5372881
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a large-capacity lithium secondary battery in which the unsticking and loosening of an electrode are suppressed by relaxing a stress applied to the electrode, and which is less prone to suffer the deterioration owing to charge and discharge cycles.SOLUTION: The lithium ion secondary battery comprises: a wound group including positive and negative electrodes capable of absorbing and releasing lithium ions reversibly and wound with a separator interposed therebetween; and an organic electrolytic solution in which an electrolyte containing the lithium ions is dissolved. The negative electrode is formed by applying a mixture layer including an active material and a binder to a current collector. The current collector includes: a copper foil; and a stress relaxation layer provided on at least one of front and rear faces of the copper foil and having an internal stress.
Inventors:
Toshio Abe
Toshiaki Morita
Toshiaki Morita
Application Number:
JP2010216331A
Publication Date:
December 18, 2013
Filing Date:
September 28, 2010
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H01M10/0587; H01M4/13; H01M4/66; H01M10/052; H01M10/0566
Domestic Patent References:
| JP2009283275A | ||||
| JP2007095569A | ||||
| JP2009181831A | ||||
| JP2007103263A | ||||
| JP2007323901A | ||||
| JP9092274A | ||||
| JP2007026913A |
Attorney, Agent or Firm:
Manabu Inoue
Yuji Toda
Shigemi Iwasaki
Yuji Toda
Shigemi Iwasaki