The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2010
Filed:
Oct. 06, 2003
Takemasa Fujino, Gunma, JP;
Takatomo Nishino, Fukushima, JP;
Yoshiaki Takeuchi, Fukushima, JP;
Sony Corporation, Tokyo, JP;
Abstract
An anode and a battery capable of realizing a high capacity and improving charge and discharge cycle characteristics, and manufacturing methods thereof are provided. An anode active material layer contains a particulate anode active material including a simple substance or a compound of an element capable of forming an alloy with Li, a particulate binder including a copolymer of vinylidene fluoride or polyvinylidene fluoride, and a conductive agent. The anode active material layer is formed by using a dispersion medium having a swelling degree of 10% or less to the binder, specifically pure water or the like. The particulate binder functions as a cushion to absorb expansion and shrinkage of the anode active material due to charge and discharge, and lowering of electron conductivity caused by generation of cracks or separation is prevented. Further, since the anode active material is not covered with the binder, electrode reaction is well performed.