Electrode, secondary battery, battery pack, and vehicle

A technology for secondary batteries and battery packs, applied in secondary batteries, secondary battery repair/maintenance, battery/fuel cell control devices, etc., can solve problems such as short charge and discharge life, achieve high energy density, excellent rapid charging Effects of discharge performance and long life characteristics

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

In particular, by TiNb 2 o 7 The composite oxide indicated has a high theoretical capacity exceeding 380mAh/g, but TiNb 2 o

Method used

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  • Electrode, secondary battery, battery pack, and vehicle
  • Electrode, secondary battery, battery pack, and vehicle
  • Electrode, secondary battery, battery pack, and vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0036] According to the first embodiment, electrodes are provided. This electrode includes an active material-containing layer containing an active material. The active material includes a plurality of primary particles containing niobium-titanium composite oxide. For 100 primary particles in a plurality of primary particles, calculate the concave-convex shape coefficient FU according to the following formula (1), respectively, and the average value of the calculated concave-convex shape coefficient FU (FU ave ) is 0.70 or more.

[0037] 【Mathematical formula 2】

[0038]

[0039] In formula (1), l is the outer peripheral length in the projected cross section of each primary particle, and a is the cross-sectional area in the projected cross section of each primary particle. 100 primary particles have a particle diameter of 0.2 to 4 times the value of the average particle diameter (D50) determined from a particle size distribution chart of a plurality of primary particles ...

no. 2 Embodiment approach

[0127] According to the second 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 first embodiment as a negative electrode.

[0128] The secondary battery 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. The secondary battery can further include an exterior member that accommodates the electrode group and the electrolyte. The secondary battery can further include a negative terminal electrically connected to the negative electrode and a positive terminal electrically connected to the positive electrode.

[0129] The secondary battery may be, for example, a lithium ion secondary battery. In addition, the secondary battery includes a nonaqu...

no. 3 Embodiment approach

[0192] According to the third embodiment, a battery module is provided. The battery module includes a plurality of secondary batteries according to the second embodiment.

[0193] In the battery module according to the third embodiment, the cells may be arranged electrically in series or in parallel, or in combination of series connection and parallel connection.

[0194] Next, an example of the battery module according to the third embodiment will be described with reference to the drawings.

[0195] Figure 9 It is a perspective view schematically showing an example of the battery module according to the third embodiment. Figure 9 The battery module 200 shown in the figure includes: five single cells 100a to 100e, four bus bars 21, a positive electrode side lead 22, and a negative electrode side lead 23. Each of the five single cells 100a to 100e is a secondary battery according to the second embodiment. Battery.

[0196] The bus bar 21 connects, for example, the negati...

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Abstract

The invention provides an electrode capable of realizing a secondary battery capable of displaying high energy density, excellent rapid charging and discharging performance and long service life, thesecondary battery provided with the electrode, a battery pack provided with the secondary battery, and a vehicle equipped with the battery pack. According to one approach, the electrode is provided. The electrode includes an active material-containing layer which contains an active material. The active material includes a plurality of primary particles containing a niobium-titanium composite oxide. For each of 100 primary particles among the plurality of primary particles, a concavo-convex shape coefficient FU is calculated according to formula (1), and the average value of the calculated concavo-convex shape coefficients FU is 0.70 or more. In formula (1), l represents the outer circumference of a projected cross-section of each primary particle, and a represents the cross-sectional areaof the projected cross-section of each primary particle. The 100 primary particles have a particle diameter that is 0.2-4 times the value of the average particle diameter determined from a particle size distribution diagram of the plurality of primary particles obtained by a laser diffraction scattering method.

Description

technical field [0001] Embodiments of the present invention relate to an electrode, a secondary battery, a battery pack, and a vehicle. Background technique [0002] In recent years, research and development of secondary batteries such as non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries as high energy density batteries has been actively carried out. Secondary batteries such as nonaqueous electrolyte secondary batteries are expected to be used as power sources for vehicles such as hybrid electric vehicles and electric vehicles, uninterruptible power supplies for mobile phone base stations, and the like. 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 rapidly charged and discharged not only greatly shortens the charging time, but also improves the pow...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/131H01M10/0525
CPCH01M4/48H01M4/131H01M10/0525H01M2004/021H01M2004/027H01M2220/20H01M4/364H01M4/485H01M4/625H01M10/052Y02E60/10Y02T10/70B60L58/10H01M10/425H01M2010/4271
Inventor 原田康宏高见则雄岩崎拓哉伊势一树吉间一臣
Owner KK TOSHIBA
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