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:
Jun. 29, 2010
Filed:
Feb. 22, 2008
Takeshi Abe, Okazaki, JP;
Masato Iwanaga, Moriguchi, JP;
Takeshi Abe, Okazaki, JP;
Masato Iwanaga, Moriguchi, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A nonaqueous electrolyte secondary batteryaccording to an embodiment of the invention includes a positive electrode, a negative electrode, a separatorand a nonaqueous electrolyte liquid in which not only the positive electrodecontains a positive electrode active material charged at or higher than 4.3 V based on lithium and a halogenated cyclic carbonate is added in the nonaqueous electrolyte liquid, but also an inorganic insulating material particle layer is formed on the surface of at least either of the positive electrode, the negative electrodeand the separator. By employing such a constitution in the present invention, a nonaqueous electrolyte secondary battery using a positive electrode charged at a high electric potential of 4.3 V or more based on lithium in which the amount of a generated gas is small even when the battery is overcharged at higher temperatures, and the impact safety and reliability thereof are high, can be provided.