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. 27, 2014
Filed:
Sep. 22, 2010
Kouji Tokita, Tokyo, JP;
Keitaro Otsuki, Tokyo, JP;
Atsushi Sano, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The first aspect of the present invention provides a method of manufacturing an active material capable of improving the discharge capacity of a lithium-ion secondary battery. The method of manufacturing an active material in accordance with the first aspect of the present invention comprises the steps of heating a phosphate source, a vanadium source, and water so as to form an intermediate containing phosphorus and vanadium and having a specific surface area of at least 0.1 m/g but less than 25 m/g; and heating the intermediate, a water-soluble lithium salt, and water. The second aspect of the present invention provides a method of manufacturing an active material capable of improving the rate characteristic of a lithium-ion secondary battery. The method of manufacturing an active material in accordance with the second aspect of the present invention comprises the steps of heating a phosphate source, a vanadium source, a water-soluble organic compound, and water for 1 to 12 hr so as to form an intermediate; and heating the intermediate, a lithium salt, and water.