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. 20, 2018
Filed:
Jul. 29, 2009
Taketsugu Yamamoto, Tsukuba, JP;
Hideaki Nakajima, Tsukuba, JP;
Hiroshi Inukai, Tsuchiura, JP;
Shigekazu Ohmori, Tsukuba, JP;
Chikara Murakami, Funabashi, JP;
Daisuke Nakaji, Tsukuba, JP;
Hidekazu Yoshida, Tsukuba, JP;
Maiko Saka, Tsukuba, JP;
Taketsugu Yamamoto, Tsukuba, JP;
Hideaki Nakajima, Tsukuba, JP;
Hiroshi Inukai, Tsuchiura, JP;
Shigekazu Ohmori, Tsukuba, JP;
Chikara Murakami, Funabashi, JP;
Daisuke Nakaji, Tsukuba, JP;
Hidekazu Yoshida, Tsukuba, JP;
Maiko Saka, Tsukuba, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Chuo-ku, Tokyo, JP;
Abstract
Disclosed is a sodium secondary battery. The sodium secondary battery comprises a first electrode and a second electrode comprising a carbonaceous material. The carbonaceous material satisfies one or more requirements selected from the group consisting of requirements 1, 2, 3 and 4. Requirement 1: R value (=ID/IG) obtained by Raman spectroscopic measurement is 1.07 to 3. Requirement 2: A value and σvalue obtained by small angle X-ray scattering measurement are −0.5 to 0 and 0 to 0.010, respectively. Requirement 3: for an electrode comprising an electrode mixture obtained by mixing 85 parts by weight of the carbonaceous material with 15 parts by weight of poly(vinylidene fluoride), the carbonaceous material in the electrode after being doped and dedoped with sodium ions is substantially free from pores having a size of not less than 10 nm. Requirement 4: Qvalue obtained by a calorimetric differential thermal analysis is not more than 800 joules/g.