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Active material, non-aqueous electrolyte battery, battery pack and vehicle

A non-aqueous electrolyte and active material technology, which is applied in the fields of active materials, non-aqueous electrolyte batteries, battery packs and vehicles, and can solve problems such as low battery voltage

Active Publication Date: 2020-08-18
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lithium intercalation and deintercalation potential of spinel lithium titanate as high as 1.55V (vs.Li / Li + ), so the battery voltage of the non-aqueous electrolyte battery using spinel-type lithium titanate in the negative electrode is low

Method used

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  • Active material, non-aqueous electrolyte battery, battery pack and vehicle
  • Active material, non-aqueous electrolyte battery, battery pack and vehicle
  • Active material, non-aqueous electrolyte battery, battery pack and vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0029] According to the first embodiment, an active material for a battery is provided. The battery active material includes active material particles containing an orthorhombic Na-containing niobium-titanium composite oxide. The molar content ratio A5 of Li, Ti, and Nb at a depth of 5 nm from the surface of the active material particle obtained by X-ray photoelectron spectroscopy measurement of the active material for batteries is relative to the molar content of Li, Ti, and Nb in the surface of the active material particle The ratio A0 satisfies the following formula (1).

[0030] 1≤A5 / A0 (1)

[0031] According to this active material for batteries, since side reactions with the nonaqueous electrolyte can be suppressed, life characteristics are improved. In addition, since resistance can be reduced as a result of suppression of side reactions, rate characteristics are also improved. The molar content ratio A5 is preferably larger than the molar content ratio A0. The rati...

no. 2 Embodiment approach

[0068]According to the second embodiment, there is provided a nonaqueous electrolyte battery. This nonaqueous electrolyte battery includes a positive electrode, a negative electrode containing the battery active material according to the first embodiment, and a nonaqueous electrolyte. The nonaqueous electrolyte battery may further include a separator, an outer packaging material, a positive terminal, and a negative terminal.

[0069] The positive electrode and the negative electrode may constitute an electrode group with a separator interposed therebetween. A non-aqueous electrolyte may be held in the electrode group. The outer packaging material can accommodate the electrode group and the non-aqueous electrolyte. The positive terminal can be electrically connected to the positive electrode. The negative terminal can be electrically connected to the negative electrode.

[0070] Hereinafter, the positive electrode, the negative electrode, the non-aqueous electrolyte, the se...

no. 3 Embodiment approach

[0135] According to a third embodiment, a battery pack is provided. This battery pack includes the nonaqueous electrolyte battery described in the second embodiment.

[0136] The battery pack according to this embodiment may include one nonaqueous electrolyte battery, or may include a plurality of nonaqueous electrolyte batteries. The plurality of non-aqueous electrolyte batteries that can be included in the battery pack can be electrically connected in series, in parallel, or a combination of series and parallel. A plurality of non-aqueous electrolyte batteries may be electrically connected to form a battery pack. A battery pack can also contain multiple battery packs.

[0137] The battery pack may further include a protection circuit. The protection circuit is a circuit that controls charge and discharge of the non-aqueous electrolyte battery. In addition, a circuit included in a device using a battery pack as a power source (for example, electronic equipment, an automob...

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Abstract

The present invention provides an active material capable of realizing a nonaqueous electrolyte battery excellent in life characteristics, a nonaqueous electrolyte battery, a battery pack, and a vehicle. According to one embodiment, an active substance is provided. The active material includes active material particles containing an orthorhombic Na-containing niobium-titanium composite oxide. The molar content ratio A5 of Li, Ti, and Nb at a depth of 5 nm from the surface of the active material particle obtained by X-ray photoelectron spectroscopy measurement with respect to the molar content ratio of Li, Ti, and Nb in the surface of the active material particle A0 satisfies the following formula (1), 1≦A5 / A0 (1).

Description

[0001] This application is based on Japanese Patent Application No. 2016-051360 (filing date: March 15, 2016), and priority is given to this application. This application incorporates the entire content of this application by reference. technical field [0002] Embodiments of the present invention relate to an active material, a nonaqueous electrolyte battery, a battery pack, and a vehicle. Background technique [0003] Non-aqueous electrolyte batteries in which charge and discharge are performed by moving lithium ions between the negative electrode and the positive electrode have been extensively studied as high energy density batteries. [0004] This non-aqueous electrolyte battery is expected to be used not only as a power source for small electronic devices, but also as a medium-to-large power source for vehicle applications and stationary applications. For such medium and large applications, long-life characteristics and high safety are required. Furthermore, high inp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/052H01M50/211H01M50/284H01M50/293H01M50/548H01M50/553H01M50/562
CPCH01M4/485H01M4/505H01M4/525H01M10/052H01M2220/20H01M50/548H01M50/211H01M50/562H01M50/553H01M50/284H01M50/293C01G33/006C01G39/006C01G45/12C01G49/0027C01G51/42C01P2002/85Y02P20/133Y02E60/10H01M4/131H01M10/425H01M4/136H01M4/5825H01M50/20H01M50/543H01M50/502Y02T10/70H01M10/44
Inventor 保科圭吾手岛史裕吉田赖司原田康宏高见则雄
Owner KK TOSHIBA