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Active material, active material composite material, electrode, secondary battery, battery pack, and vehicle

A technology of active materials and battery packs, applied in active material electrodes, secondary battery charging/discharging, small-sized batteries/battery packs, etc., can solve the problem of low energy density and achieve the effect of improving electronic conductivity

Active Publication Date: 2019-10-22
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a battery with a negative electrode using titanium oxide as a negative electrode active material has a problem of lower energy density than a battery with a carbon-based negative electrode.

Method used

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  • Active material, active material composite material, electrode, secondary battery, battery pack, and vehicle
  • Active material, active material composite material, electrode, secondary battery, battery pack, and vehicle
  • Active material, active material composite material, electrode, secondary battery, battery pack, and vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0030] According to the first embodiment, an active material is provided. The active material is a monoclinic niobium-titanium composite oxide particle in which the average value of the aspect ratio of primary particles is 5 or more.

[0031] The aspect ratio of the primary particles refers to the ratio L / S of the major axis length L and the minor axis length S of the primary particles. When using an active material in which the average value of the aspect ratio of the primary particles is 5 or more, that is, the shape of the primary particles is an elongated rod, the average value of the aspect ratio of the primary particles is less than 5, that is, the shape of the primary particles is smaller. Compared with the case of a nearly spherical active material, the gap between the primary particles can be reduced, so the density of the electrode can be increased.

[0032] Moreover, when using the active material whose primary particle aspect ratio average value is 5 or more as me...

no. 2 Embodiment approach

[0115] According to the second embodiment, electrodes are provided. The electrode of the second embodiment contains the active material of the first embodiment. The active material may be in the form of the active material composite described above. The electrode of the second embodiment may be an electrode for a battery. The electrode of the second embodiment can be used, for example, as a negative electrode.

[0116] The electrode of the second embodiment may include a current collector and an active material-containing layer. The active material-containing layer may be formed on one or both surfaces of the current collector. The active material-containing layer may contain an active material, and optionally a conductive agent and a binder.

[0117] The active material-containing layer may contain the active material of the first embodiment alone, or may contain two or more active materials of the first embodiment. Furthermore, a mixture in which one or two or more acti...

no. 3 Embodiment approach

[0132] According to the third embodiment, there is provided a secondary battery including a negative electrode, a positive electrode, and an electrolyte. This secondary battery includes the electrode of the second embodiment as a negative electrode.

[0133] The secondary battery of the third embodiment may further include a separator disposed between the positive electrode and the negative electrode. The negative electrode, the positive electrode, and the separator may constitute an electrode group. Electrolyte can be held in the electrode group.

[0134] In addition, the secondary battery according to the third embodiment may further include an exterior member for accommodating the electrode group and the electrolyte.

[0135] Furthermore, the secondary battery of the third embodiment may further include a negative terminal electrically connected to the negative electrode and a positive terminal electrically connected to the positive electrode.

[0136] The secondary batt...

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Abstract

Embodiments of the present invention relate to an active material, an active material composite material, an electrode, a secondary battery, a battery pack, and a vehicle. Specifically, the present invention provides an active material capable of improving the density and electron conductivity of an electrode, and an active material composite material, an electrode, a secondary battery, a batterypack, and a vehicle containing the active material. According to an embodiment, an active material is provided. The active material is particles of a monoclinic niobium-titanium composite oxide in which the average aspect ratio of primary particles is 5 or more.

Description

technical field [0001] Embodiments of the present invention relate to active materials, active material composites, electrodes, secondary batteries, battery packs, and vehicles. Background technique [0002] In recent years, secondary batteries such as lithium ion secondary batteries and nonaqueous electrolyte secondary batteries have been developed as high energy density batteries. Secondary batteries are expected to be used as power sources for vehicles such as hybrid vehicles and electric vehicles, or as power sources for large-scale electric storage. When a secondary battery is used as a power source for a vehicle, in addition to high energy density, it is required to achieve rapid charge and discharge performance, long-term reliability, and the like. [0003] Rapid charge and discharge means that lithium ions and electrons can move rapidly between the positive and negative electrodes that can occlude / release lithium ions and electrons, respectively, via the electrolyte...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/485H01M10/0525C01G33/00C01G37/00C01G39/00C01G41/00C01G49/00H01M50/178H01M50/211H01M50/271H01M50/284H01M50/296H01M50/548H01M50/55H01M50/553H01M50/562
CPCH01M4/48H01M4/485H01M10/0525C01G33/006C01G37/00C01G39/006C01G41/006C01G49/009H01M2004/021H01M2004/027C01P2004/61H01M50/553H01M50/178H01M50/284H01M50/296H01M50/211H01M50/55H01M50/548H01M50/271H01M50/562H01M2220/20H01M2200/00C01G33/00C01P2006/40C01P2002/30C01P2002/76C01P2002/72C01P2002/52C01P2002/54C01P2004/54C01P2002/60C01P2004/51C01P2006/12B60L50/66B60L50/64B60L53/80Y02T10/7072H01M4/133H01M4/366H01M4/661H01M10/44H01M10/425H01M2004/028B60L50/51H01M50/519H01M4/625H01M50/509H01M50/209H01M4/131H01M50/249
Inventor 原田康宏高见则雄深谷太郎岩崎拓哉
Owner KK TOSHIBA
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