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:
Nov. 13, 2012
Filed:
Nov. 20, 2009
Tsutomu Fujii, Tokyo, JP;
Osamu Hatozaki, Tokyo, JP;
Tsutomu Fujii, Tokyo, JP;
Osamu Hatozaki, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
[Problem] The present invention aims to enhance a characteristic of a lithium ion electric storage device upon charging or discharging with high load, and increasing a working temperature range thereof. [Means for Solving Problem] In a positive electrode active material used for a lithium ion electric storage device, the BET specific surface area is 1500 m/g or more and 3000 m/g or less, the ratio A of the pore volume within the range of the pore diameter of 0.6 nm or more and less than 1 nm to the pore volume within the range of the pore diameter of 0.6 nm or more and 200 nm or less in the active material satisfies 0≦A≦0.80, and the ratio B of the active material of the pore volume within the range of the pore diameter of 1 nm or more and 6 nm or less to the pore volume within the range of the pore diameter of 0.6 nm or more and 200 nm or less in the active material satisfies 0.20≦B≦1.0. By virtue of this structure, the lithium ion electric storage device can be provided that is excellent in the charging/discharging characteristic when it is given a high load, and that can satisfactorily operate even under an environment of −30° C.