Nonaqueous electrolyte secondary cell, nonaqueous electrolyte and the method for charging the same

一种非水电解质、二次电池的技术，应用在非水电解质蓄电池、二次电池充电/放电、二次电池等方向，达到过度充电保护特性提高、抑制反应的效果

Inactive Publication Date: 2007-08-01
SANYO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the charging voltage is higher, the positive electrode capacity can use more than 70% of the theoretical capacity, and the high capacity and high energy density of the battery become possible.

Method used

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  • Nonaqueous electrolyte secondary cell, nonaqueous electrolyte and the method for charging the same
  • Nonaqueous electrolyte secondary cell, nonaqueous electrolyte and the method for charging the same
  • Nonaqueous electrolyte secondary cell, nonaqueous electrolyte and the method for charging the same

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Embodiment Construction

[0073] Hereinafter, specific embodiments for implementing the present invention will be described in detail through examples and comparative examples. But, following embodiment is an example for the non-aqueous electrolyte secondary battery of technical thought of the present invention is explained in detail, is not that the present invention is limited to this embodiment, and the present invention does not deviate from the technical thought shown in the scope of claims Various changes can be made within the scope.

[0074] First, a specific method of manufacturing a non-aqueous electrolyte secondary battery common to Examples and Comparative Examples will be described.

[0075] Positive electrode production

[0076] The dissimilar element-added lithium cobaltate was produced as follows. As a starting material, lithium carbonate (Li 2 CO 3 ) as a lithium source; when cobalt carbonate is synthesized, an aqueous solution of 0.2 mol% of Zr and 0.5 mol% of Mg is added with res...

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Abstract

A nonaqueous electrolyte secondary battery of the invention has a positive electrode having a positive electrode active material, a negative electrode, and a nonaqueous electrolyte having electrolyte salt in a nonaqueous solvent. The electric potential of the positive electrode active material is 4.4 to 4.6 V relative to lithium, and the nonaqueous electrolyte contains a compound expressed by structural formula (I) below. The quantity of compound added is preferably 0.1% to 2% by mass. Also, the positive electrode active material preferably comprises a mixture of a lithium-cobalt composite oxide which is LiCoO2 containing at least both zirconium and magnesium and a lithium-manganese-nickel composite oxide that has a layer structure and contains at least both manganese and nickel. Thanks to such structure, a nonaqueous electrolyte secondary battery can be provided that is charged to charging termination potential of 4.4 to 4.6 V relative to lithium and that has enhanced overcharging safety.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery charged at a high voltage using a positive electrode active material whose charging termination potential is set at 4.4 to 4.6 V based on lithium, and a charging method thereof, and particularly relates to improving the charging termination potential A non-aqueous electrolyte secondary battery, a non-aqueous electrolyte, and a charging method thereof are provided which are safe at the time of overcharging and are charged at 4.4 to 4.6 V based on lithium. Background technique [0002] With the rapid popularization of portable electronic devices, the requirements for the specifications of the batteries used in them are becoming stricter year by year, especially small and thin, high capacity, excellent cycle characteristics, and stable performance. Also, in the field of secondary batteries, nonaqueous electrolyte secondary batteries having higher energy density than other batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/48H01M4/58H01M10/44H01B1/12H01M4/02H01M4/36H01M4/505H01M4/525H01M10/05H01M10/052H01M10/0567
CPCH01M4/505H01M4/525H01M10/0569H01M4/485H01M2300/004Y02E60/122H01M4/131H01M10/0567Y02E60/10H01M10/05H01M10/44
Inventor 岩永征人冲雪寻安部浩司三好和弘
Owner SANYO ELECTRIC CO LTD
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