Title:
リチウムイオン二次電池
Document Type and Number:
Japanese Patent JP6996992
Kind Code:
B2
Abstract:
To restrain deterioration of cycle characteristics, in a lithium ion secondary battery containing a blend of silicon (Si) and graphite, or a blend of silicon oxide (SiO) and graphite as the negative electrode active material.SOLUTION: A lithium ion secondary battery includes a negative electrode. The negative electrode includes a negative electrode mixture layer. The negative electrode mixture layer contains a negative electrode active material, and a binder. The negative electrode active material is any one of a blend of silicon and graphite, or a blend of silicon oxide and graphite. The binder contains cycloolefin polymer where the principal chain contains cycloolefin polymer consisting of a hard segment and a soft segment. The hard segment includes a cycloaliphatic hydrocarbon structure where the carbon number constituted of more than one monocycles is 7-30. The soft segment includes a chain hydrocarbon structure where the carbon number is 2-10. Mole ratio of the hard segment and soft segment is hard segment : soft segment=80-20:20-80.SELECTED DRAWING: None
Inventors:
Ryosuke Osawa
Risa Taniguchi
Risa Taniguchi
Application Number:
JP2018014583A
Publication Date:
January 17, 2022
Filing Date:
January 31, 2018
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
H01M4/62; C08K3/04; C08K3/34; C08L45/00; H01M4/13; H01M4/133; H01M4/134; H01M4/36; H01M4/38; H01M4/48; H01M4/587
Domestic Patent References:
| JP5230144A | ||||
| JP61271308A | ||||
| JP2004346274A |
Foreign References:
| US20120308889 | ||||
| WO2013065738A1 |
Other References:
WEST,James C.ほか,ゴムの科学と技術[第17回],日本ゴム協会誌,1984年,57(1),45-65
Attorney, Agent or Firm:
Fukami patent office
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