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Electrode, secondary battery, battery pack, and vehicle

A technology for secondary batteries and battery packs, applied in secondary batteries, battery/battery traction, secondary battery repair/maintenance, etc., can solve problems such as difficulty in reducing electrode resistance

Pending Publication Date: 2021-03-19
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode containing niobium-titanium composite oxide has a problem that it is difficult to reduce the resistance between the electrode and the counter electrode.

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

[0029] According to the first embodiment, an electrode can be provided. The electrode includes a current collector, a first layer formed on the current collector, and a second layer formed on at least a part of the first layer. The first layer contains a monoclinic niobium-titanium composite oxide. The second layer contains lithium titanate having a spinel structure. The porosity P2 of the second layer is not less than 30% and not more than 80%.

[0030] Monoclinic niobium-titanium composite oxide has higher surface reactivity than lithium titanate with a spinel structure, and is prone to side reactions with electrolytes, etc., so it has a large self-discharge capacity (self-discharge capacity per unit time) Propensity. In order to reduce the internal resistance in the secondary battery, for example, it is effective to reduce the distance between the positive electrode and the negative electrode by reducing the film thickness of the separator. However, an electrode contain...

no. 2 Embodiment approach

[0096] According to the second embodiment, there is provided a secondary battery including a negative electrode, a positive electrode, and an electrolyte. The secondary battery includes the electrode according to the first embodiment as a negative electrode.

[0097] The secondary battery may 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.

[0098] In addition, the secondary battery may further include an exterior member that accommodates the electrode group and the electrolyte.

[0099] In addition, the secondary battery may further include a negative terminal electrically connected to the negative electrode and a positive terminal electrically connected to the positive electrode.

[0100] The secondary battery may be, for example, a lithium secondary battery. In addition, the se...

no. 3 Embodiment approach

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

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

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

[0195] Figure 6 It is a perspective view schematically showing an example of the assembled battery according to the embodiment. Figure 6 The illustrated battery pack 200 includes five cells 100a to 100e, four bus bars 21, a positive lead 22, and a negative lead 23. The five cells 100a to 100e are secondary batteries according to the second embodiment.

[0196] The bus bar 21 connects, for example, the negative terminal 6 of one c...

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Abstract

The present invention provides an electrode of a secondary battery capable of achieving low resistance and suppressing self-discharge, a secondary battery provided with the electrode, a battery pack provided with the secondary battery, and a vehicle provided with the battery pack. According to one embodiment, an electrode is provided. The electrode includes a current collector, a first layer formed on the current collector, and a second layer formed on at least part of the first layer. The first layer contains a monoclinic niobium titanium composite oxide. The second layer contains lithium titanate having a spinel structure. A porosity P2 of the second layer is within a range from 30% to 80%.

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 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 as power sources for vehicles such as hybrid electric vehicles and electric vehicles, as uninterruptible power supplies for mobile phone base stations, and the like. Therefore, secondary batteries are required to be excellent in other performances such as rapid charge and discharge performance and long-term reliability in addition to high energy density. For example, a secondary battery that can be quickly charged and discharged can not only greatly shorten the charging time, but also improve the power performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/485H01M10/052H01M10/0525
CPCH01M4/131H01M4/485H01M10/052H01M10/0525H01M2004/021H01M2004/027H01M2220/20H01M10/425H01M50/249H01M50/204B60L50/64H01M4/364Y02E60/10H01M4/665H01M4/661H01M2004/028H01M4/525H01M4/505
Inventor 杉崎知子笹川哲也吉间一臣草间知枝原田康宏高见则雄
Owner KK TOSHIBA
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