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Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using the same

A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve problems such as the reduction of active material quality

Inactive Publication Date: 2009-03-18
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the reason for setting such a lower particle size limit, it has been mentioned that as the particle diameter decreases, the proportion of other solids such as binders required to form each electrode increases and thus the amount of active material per unit weight decreases

Method used

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  • Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using the same
  • Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using the same
  • Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using the same

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no. 1 approach

[0020] A first embodiment of the present invention is a positive electrode of a nonaqueous electrolyte secondary battery, which is constituted by forming a positive electrode active material layer on a current collector. Moreover, the positive electrode active material layer comprises spinel lithium manganate as the positive electrode active material, and a composite oxide represented by the following formula (1):

[0021] LiCo v Ni x mn y m z o 2 (1)

[0022] In the formula, v+x+y+z=1, M is any one selected from aluminum (Al), gallium (Ga) and indium (In), 0≤v≤0.5, 0.3≤x<1, 0≤ y≤0.5, and 0≤z≤0.1. Furthermore, the positive electrode active material layer is characterized in that the average particle diameter of the composite oxide is larger than the average particle diameter of the spinel-type lithium manganate.

[0023] Despite excellent capacity characteristics, complex oxides have an inherent problem of poor thermal stability. However, by adjusting the average p...

no. 2 approach

[0078] In the second embodiment, a nonaqueous electrolyte secondary battery is constituted using the positive electrode of the nonaqueous electrolyte secondary battery of the above-mentioned first embodiment. Specifically, the second embodiment of the present invention is a non-aqueous electrolyte secondary battery comprising at least one single cell layer formed by sequentially stacking a positive electrode, a dielectric layer, and a negative electrode, characterized in that, using the non-aqueous electrolyte according to the present invention The positive electrode of the aqueous electrolyte secondary battery was used as the above-mentioned positive electrode.

[0079] A nonaqueous electrolyte secondary battery including the positive electrode of the nonaqueous electrolyte secondary battery of the present invention as at least one electrode belongs to the technical scope of the present invention. However, it is preferable that all electrodes constituting the nonaqueous elect...

no. 3 approach

[0103] In the third embodiment, an assembled battery is constructed by connecting a plurality of bipolar batteries of the above-mentioned second embodiment in parallel and / or in series.

[0104] Fig. 3 is a perspective view of the assembled battery of the present embodiment.

[0105] As shown in FIG. 3, an assembled battery 40 is constructed by connecting a plurality of bipolar batteries described in the above-mentioned second embodiment to each other. Each bipolar battery 10 is connected by connecting its positive terminal 25 and negative terminal 27 to each other using bus bars. On one side of the assembled battery 40 , electrode terminals 42 and 43 are provided as electrodes of the assembled battery 40 as a whole.

[0106] There is no specific limitation on the connection method when the plurality of bipolar batteries 10 constituting the assembled battery 40 are connected to each other, and known methods can be appropriately employed. For example, welding methods such as ...

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Abstract

A positive electrode for a non-aqueous electrolyte secondary battery of the present invention has: a current collector; and a positive electrode active material layer formed on the current collector. The positive electrode active material layer contains, as positive electrode active materials, spinel lithium manganate, and a composite oxide represented by the following formula (1): LiCo v Ni x MnyM z O 2 (1), where v+x+y+z=1, M is any one selected from the group consisting of aluminum, gallium and indium, 0 <= v <=0.5, 0.3 <=x <1, 0 <= y <= 0.5 and 0 <=z<= 0.1. Further, an average particle diameter of the composite oxide is larger than an average particle diameter of the spinel lithium manganate.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery. More specifically, the present invention relates to a nonaqueous electrolyte secondary battery excellent in capacity characteristics and output characteristics. Background technique [0002] In recent years, there has been a strong desire to reduce the amount of carbon dioxide to solve the problems of air pollution and global warming. In the automotive industry, expectations are focused on reducing the amount of carbon dioxide through the introduction of electric vehicles (EV) and hybrid electric vehicles (HEV). Thus, secondary batteries for driving motors (secondary batteries for driving motors), which are the key to putting EVs and HEVs into practical use, are being actively developed. [0003] As a secondary battery for driving a motor, a nonaqueous electrolyte secondary battery having the highest theoretical energy among all batteries is attracting attention, and is cur...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/58H01M4/48H01M4/62H01M10/40B60L11/18
CPCY02T10/7011Y02T10/7005Y02E60/122Y02E60/10
Inventor 三浦环大泽康彦
Owner NISSAN MOTOR CO LTD
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