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

A technology of active materials and secondary batteries, which is applied in the direction of active material electrodes, secondary batteries, small-sized batteries/battery packs, etc., can solve the problem of easy damage to the capacity balance of positive and negative electrodes, and achieve the effect of excellent weight and energy density

Active Publication Date: 2019-10-01
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the niobium-titanium composite oxide is expected to be used as a substitute for Li 4 Ti 5 o 12 high-capacity material, but there is a problem that the capacity balance between the positive electrode and the negative electrode is easily broken during the charge-discharge cycle

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0036] According to the first embodiment, an active material is provided. The active material contains Nb 2 TiO 7 Phase and selected from Nb 10 Ti 2 o 29 Phase, Nb 14 TiO 37 Phase and Nb 24 TiO 64 At least one Nb-rich phase among the phases satisfies the peak intensity ratio represented by the following formula (1).

[0037] 0B / I A ≤0.25(1)

[0038] In formula (1), I A In order to appear at 2θ=26.0±0.1° in the diffraction peak obtained by the wide-angle X-ray diffraction method using CuKα rays as the X-ray source, it is attributed to Nb 2 TiO 7 The peak intensity of the largest peak of the phase, I B is the peak intensity of the largest peak that appears at 2θ=24.9±0.2° among the diffraction peaks and is attributed to the Nb-rich phase.

[0039] The reason why this active material can realize a secondary battery exhibiting excellent gravimetric energy density, overcharge resistance, and cycle life characteristics will be described.

[0040] First, for Nb 2 TiO ...

no. 2 Embodiment approach

[0117] According to the second embodiment, electrodes are provided.

[0118] The electrode according to the second embodiment includes the active material according to the first embodiment. This electrode may be an electrode for a battery containing the active material according to the first embodiment as the active material for a battery. The electrode as the battery electrode may be, for example, a negative electrode including the active material according to the first embodiment as the negative electrode active material.

[0119] The electrode according to the second embodiment can 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 can contain an active material and optionally a conductive agent and a binder.

[0120] The active material-containing layer may contain the active material according to the first embodimen...

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 according to the second embodiment as a negative electrode. That is, the secondary battery according to the third embodiment includes, as a negative electrode, an electrode containing the active material according to the first embodiment as a battery active material.

[0133] The secondary battery according to the third embodiment can also further include a separator disposed between the positive electrode and the negative electrode. The negative electrode, the positive electrode, and the separator can 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 that houses the electrode group and the electrolyte.

[0135] Furthermore, the secon...

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Abstract

The invention relates to an active material, an electrode, a secondary battery, a battery pack, and a vehicle. Provided are: the active material which is capable of providing a secondary battery thatexhibits excellent gravimetric energy density, overcharge resistance and cycle life characteristics; the electrode which contains the active material; the secondary battery which is provided with theelectrode; the battery pack which is provided with the secondary battery; and the vehicle on which the battery pack is mounted. According to one embodiment, the active material is provided. The activematerial contains an Nb2TiO7 phase and at least one Nb-rich phase selected from the group consisting of an Nb10Ti2O29 phase, an Nb14TiO37 phase, and an Nb24TiO64 phase, and satisfies the peak intensity ratio represented by formula (1): 0 < IB / IA < = 0.25 (1); in Formula (1), IA is a peak intensity of the maximum peak attributed to the Nb2TiO7 phase and appearing at 2 [theta] of 26.0+ / -0.1 degreein a wide angle X-ray diffraction pattern under CuK [alpha] rays as an X-ray source; IB is a peak intensity of the maximum peak attributed to the at least one Nb-rich phase and appearing at 2[theta] of 24.9+ / -0.2 degree in the diffraction pattern.

Description

technical field [0001] Embodiments of the present invention relate to active materials, electrodes, secondary batteries, battery packs, and vehicles. Background technique [0002] In recent years, research and development of secondary batteries such as nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries have been actively carried out as high energy density batteries. Secondary batteries such as non-aqueous electrolyte secondary batteries are expected to be used as power sources for vehicles such as hybrid electric vehicles and electric vehicles, and uninterruptible power supplies (emergency power supplies) for mobile phone base stations. Therefore, in addition to high energy density, secondary batteries are also required to be excellent in other performances such as rapid charge and discharge performance and long-term reliability. For example, a secondary battery that can be quickly charged and discharged can not only greatly shorten the charg...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525H01M4/136C01G33/00H01M50/209H01M50/271H01M50/284H01M50/289H01M50/296H01M50/548H01M50/55H01M50/553
CPCH01M4/5825H01M4/136H01M10/0525C01G33/00C01P2002/72C01P2004/61C01P2006/40H01M50/548H01M50/296H01M50/553H01M50/271H01M50/209H01M50/284H01M50/289H01M50/55C01P2002/74C01P2004/62C01P2004/50C01P2006/12H01M2220/20H01M4/483H01M2004/027B60L3/0046B60L50/64Y02E60/10Y02T10/70H01M4/485H01M4/366C01P2004/84C01P2002/77
Inventor 原田康宏高见则雄笹川哲也并木佑介山下泰伸
Owner KK TOSHIBA
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