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:
May. 01, 2012
Filed:
Nov. 11, 2008
Katsutoshi Takeda, Moriguchi, JP;
Yoshio Kato, Moriguchi, JP;
Shingo Tode, Moriguchi, JP;
Masanori Maekawa, Moriguchi, JP;
Shigeki Matsuta, Moriguchi, JP;
Katsutoshi Takeda, Moriguchi, JP;
Yoshio Kato, Moriguchi, JP;
Shingo Tode, Moriguchi, JP;
Masanori Maekawa, Moriguchi, JP;
Shigeki Matsuta, Moriguchi, JP;
SANYO Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A positive electrode active material quality judgment method that can easily and accurately judge the quality of a positive electrode active material used in a non-aqueous electrolyte secondary cell without having to complete the positive electrode. The positive electrode active material quality judgment method includes: heating a positive electrode active material mainly made of a lithium nickel composite oxide to a temperature x (° C.) of 200° C. or higher and 400° C. or lower; measuring the amount of carbon dioxide gas generated from the heating; and the positive electrode active material as a suitable positive electrode active material when the positive electrode active material satisfies formulas 3 and 4:<(1.31−258)/1000000(200≦<300)  formula 3<1.20−225/1000000(300≦≦400)  formula 4where x is the heating temperature x (° C.) and y is the amount of carbon dioxide gas (mole/g) generated per 1 g of the positive electrode active material in the heating to the heating temperature x (° C.).