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Electrode, nonaqueous electrolyte battery, and battery pack

A non-aqueous electrolyte and electrode technology, which is applied to large-size batteries/battery packs, small-size batteries/battery packs, battery electrodes, etc., can solve problems such as low energy density, and achieve the effect of improving input and output characteristics

Active Publication Date: 2013-05-22
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, for non-aqueous electrolyte batteries using spinel-type lithium titanate as the negative electrode active material, there is a problem of low energy density, and it is necessary to obtain high-capacity negative electrode materials.

Method used

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  • Electrode, nonaqueous electrolyte battery, and battery pack
  • Electrode, nonaqueous electrolyte battery, and battery pack
  • Electrode, nonaqueous electrolyte battery, and battery pack

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0025] According to the first embodiment, there is provided an electrode including a current collector and an active material-containing layer formed on the current collector. The active material-containing layer may be formed on one or both surfaces of the current collector. The Li intercalation potential of the active material contained in the active material layer is 0.4V (vs.Li / Li + )above. In the pore size distribution measured by mercury porosimetry, there are a first peak having a mode diameter of 0.01 μm to 0.1 μm and a second peak having a mode diameter of more than 0.2 μm and 1 μm or less. The volume of the pores measured by the mercury porosimetry is 0.1 mL to 0.3 mL per 1 g of the electrode weight (the weight excluding the current collector).

[0026] The reason for setting the Li intercalation potential of the active material within the above range will be described. For a ratio of 0.4V (vs.Li / Li + ) Active materials (such as graphite, lithium metal, etc.) tha...

no. 2 Embodiment approach

[0052] According to the second embodiment, it is possible to provide a nonaqueous electrolyte battery including a positive electrode, the electrode of the first embodiment as a negative electrode, and a nonaqueous electrolyte.

[0053] For an example of the non-aqueous electrolyte battery of the second embodiment, refer to Figure 1 to Figure 3 Detailed description. figure 1 It is a sectional view showing an example of the non-aqueous electrolyte battery of the second embodiment, that is, a flat lithium-ion secondary battery, figure 2 yes means figure 1 An enlarged cross-sectional view of part A of, image 3 yes means figure 1 A schematic diagram of the vicinity of the boundary of the secondary battery containing the positive electrode active material layer, the porous separator, and the layer containing the negative electrode active material.

[0054] Such as figure 1 As shown, for example, an electrode group 2 is accommodated in an exterior member 1 made of a film. Th...

no. 3 Embodiment approach

[0107] The battery pack of the third embodiment includes one or more nonaqueous electrolyte batteries of the second embodiment. Preferably, the non-aqueous electrolyte battery of the second embodiment is used as a unit cell, and the unit cells are electrically connected in series or in parallel to form a battery pack.

[0108] The non-aqueous electrolyte battery of the second embodiment is suitable for being assembled into a battery pack, and the battery pack of the third embodiment has excellent cycle characteristics. Explain this.

[0109] When the retention of the non-aqueous electrolyte is improved, the entire surface of the negative electrode active material can be brought into contact with the non-aqueous electrolyte, and the lithium ion concentration in the negative electrode active material can be easily made uniform. As a result, application of an overvoltage becomes difficult, that is, since local overcharge and overdischarge are less likely to occur, the utilizatio...

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Abstract

According to one embodiment, an electrode includes a current collector, an active material-containing layer, a first peak, a second peak and a pore volume. The active material-containing layer contains an active material having a lithium absorption potential of 0.4 V (vs. Li / Li+) or more. The first peak has a mode diameter of 0.01 to 0.1 mum in a diameter distribution of pores detected by mercury porosimetry. The second peak has a mode diameter of 0.2 mum (exclusive) to 1 mum (inclusive) in the diameter distribution of pores. The pore volume detected by the mercury porosimetry is within a range of 0.1 to 0.3 mL per gram of a weight of the electrode excluding a weight of the current collector.

Description

[0001] This application is based on Japanese patent application 2011-250549 (filing date: 11 / 16 / 2011), and enjoys the priority of this application. This application refers to this application and includes the entire content of this application. technical field [0002] Embodiments of the present invention relate to electrodes, nonaqueous electrolyte batteries, and battery packs. Background technique [0003] Non-aqueous electrolyte batteries such as lithium-ion secondary batteries are widely used in various fields such as electric vehicles, electric storage, and information equipment as high-energy-density batteries. Along with this, the demand from the market has further increased, and research has been actively carried out. [0004] Among them, non-aqueous electrolyte batteries used as power sources for electric vehicles require high energy density, that is, high discharge capacity per unit weight or unit volume, due to their application. Therefore, in order to regenerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/485H01M10/0525H01M50/105
CPCH01M2/02Y02E60/122Y02T10/7011H01M4/131H01M2/0207H01M2004/021H01M4/485H01M10/0525Y02E60/10H01M50/105Y02T10/70
Inventor 岩崎拓哉稻垣浩贵安田一浩保科圭吾石桥充吉田赖司高见则雄
Owner KK TOSHIBA
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