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:
Feb. 21, 2012
Filed:
May. 15, 2006
Yukihiro Miyamoto, Kanagawa, JP;
Masao Miyake, Ibaraki, JP;
Etsuko Miyake, Legal Representative, Aichi, JP;
Tooru Fuse, Ibaraki, JP;
Tomohiro Satou, Ibaraki, JP;
Youji Arita, Kanagawa, JP;
Yukihiro Miyamoto, Kanagawa, JP;
Masao Miyake, Ibaraki, JP;
Etsuko Miyake, legal representative, Aichi, JP;
Tooru Fuse, Ibaraki, JP;
Tomohiro Satou, Ibaraki, JP;
Youji Arita, Kanagawa, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A negative electrode material for a nonaqueous electrolyte rechargeable battery that can stably and efficiently realize a high-performance nonaqueous electrolyte rechargeable battery in which a high discharge capacity, high charge/discharge efficiency at an initial stage and during charge/discharge cycles, and excellent charge/discharge cycle properties are provided as well as electrode expansion in volume after charge/discharge cycles is suppressed. The negative electrode material for a nonaqueous electrolyte rechargeable battery in the form of particles having, at least on the surface thereof, a compound of the phase in which an element Z is present in Si in a non-equilibrium state. The compound is expressed by the general formula SiZM, where Z represents C and/or N, M represents an element other than C and N, and when the concentration of the element Z in a compound SiZ, where each of a and p is an integer, having a composition closest to that of Si and present in an equilibrium state is presumed to be 100 atomic percent, the concentration of the element Z in the compound SiZMis in the range of 10 to 95 atomic percent, and y is in the range of 0 to 0.5.