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:
Aug. 13, 2013
Filed:
Jun. 30, 2008
Hiroki Kondo, Nisshin, JP;
Tsuyoshi Sasaki, Aichi-gun, JP;
Osamu Hiruta, Nagoya, JP;
Yuichi Itou, Toyota, JP;
Chikaaki Okuda, Nagoya, JP;
Youji Takeuchi, Seto, JP;
Yoshio Ukyo, Seto, JP;
Hiroki Kondo, Nisshin, JP;
Tsuyoshi Sasaki, Aichi-gun, JP;
Osamu Hiruta, Nagoya, JP;
Yuichi Itou, Toyota, JP;
Chikaaki Okuda, Nagoya, JP;
Youji Takeuchi, Seto, JP;
Yoshio Ukyo, Seto, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi, JP;
Abstract
The present invention provides a water based lithium secondary battery that can inhibit deteriorations in capacity owing to charge-and-discharge operations and maintain a high capacity even after it is charged and discharged repeatedly. The water based lithium secondary battery includes a positive electrode, a negative electrode, a separatorsandwiched between these, and an aqueous electrolyte solution obtained by dissolving an electrolyte made of a lithium salt in a water based solvent. As the water based solvent, a pH buffer solution is employed. The buffer solution is obtained by dissolving an acid and its conjugate base's salt, a base and its conjugate acid's salt, a salt made from a weak acid and a strong base, a salt made from a weak base and a strong acid, or a salt made from a weak acid and a weak base in water.