Title:
リチウム二次電池負極およびその製造方法
Document Type and Number:
Japanese Patent JP6448681
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lithium secondary battery negative electrode using a silicon based material as an active material, which has high discharge capacity and favorable cycle characteristics.SOLUTION: The lithium secondary battery negative electrode is a laminate formed by providing a silicon based active material layer including polyimide as a binder on a collector. A porosity of the silicon based active material layer is in a range of 15-40%, and an adhesive strength between the collector and the silicon based active material layer is 3.0 N/cm or more. In a method for manufacturing the lithium secondary battery negative electrode, a dispersion comprising a silicon based particle having an average particle size of less than 1 μm, a polyimide precursor and a solvent is applied, dried and thermally cured on a collector, thereby forming an active material layer having a porosity of 15-40% on the collector without performing heat-pressure treatment.
Inventors:
Jin Yatsushiro
Masahiro Hosoda
Shigeta Akira
Muneki Yamada
Hisashi Eguchi
Yoshiaki Echigo
Masahiro Hosoda
Shigeta Akira
Muneki Yamada
Hisashi Eguchi
Yoshiaki Echigo
Application Number:
JP2017030716A
Publication Date:
January 09, 2019
Filing Date:
February 22, 2017
Export Citation:
Assignee:
Iwate University
UNITIKA LTD.
UNITIKA LTD.
International Classes:
H01M4/134; H01M4/13; H01M4/1391; H01M4/1395; H01M4/38; H01M4/48; H01M4/62
Domestic Patent References:
| JP2010238426A | ||||
| JP2002117835A | ||||
| JP2009224168A | ||||
| JP2011086427A | ||||
| JP2004213927A | ||||
| JP2011034836A |
Attorney, Agent or Firm:
Morimoto International Patent Office