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Battery with nonaqueous electrolyte, negative electrode active material for use in the battery, and battery pack

A technology of negative electrode active material and non-aqueous electrolyte, which is applied in the fields of non-aqueous electrolyte battery, negative electrode active material used for the non-aqueous electrolyte battery, and battery pack, can solve problems such as difficult capacity improvement, and achieve high initial discharge capacity, The effect of excellent charge-discharge cycle performance

Active Publication Date: 2014-07-23
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the practical capacity of spinel-type lithium titanate is 170 mAh / g. Even if titanium dioxide described in Patent Documents 1 to 3 is used as an active material, it is difficult to increase the capacity significantly compared with spinel-type lithium titanate. improve

Method used

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  • Battery with nonaqueous electrolyte, negative electrode active material for use in the battery, and battery pack
  • Battery with nonaqueous electrolyte, negative electrode active material for use in the battery, and battery pack
  • Battery with nonaqueous electrolyte, negative electrode active material for use in the battery, and battery pack

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no. 1 approach

[0037] For the negative electrode active material for non-aqueous electrolyte batteries of the first embodiment, it contains the compound with the crystal structure of monoclinic titanium dioxide, and the compound has the highest intensity measured by the powder X-ray diffraction method using the Cu-Kα ray source. The peak is a peak of the (001) plane, (002) plane, or (003) plane, and the half-value width (2θ) of the aforementioned highest intensity peak is 0.5 deg to 4 deg. Hereinafter, this compound is referred to as a titanium oxide compound.

[0038] Here, the crystal structure of monoclinic titanium dioxide refers to a crystal structure mainly represented by the space group C2 / m, and those described in the above-mentioned Non-Patent Document 1 are used as objects. Hereinafter, the crystal structure of monoclinic titanium dioxide is referred to as TiO including the case where lithium ions are contained in the crystal structure. 2 (B).

[0039] figure 1 Indicates that Ti...

no. 2 approach

[0071] A nonaqueous electrolyte battery according to a second embodiment includes a positive electrode, a negative electrode containing the negative electrode active material for a nonaqueous electrolyte battery according to the first embodiment, a nonaqueous electrolyte, a separator, and an exterior member.

[0072] Next, the positive electrode, the negative electrode, the non-aqueous electrolyte, the separator, and the exterior member will be described in detail.

[0073] The positive electrode has a current collector, and a positive electrode layer (layer containing a positive electrode active material) containing a positive electrode active material and a binder supported on one or both surfaces of the current collector.

[0074] Examples of the positive electrode active material include oxides, sulfides, and the like. For example, manganese dioxide (MnO 2 ), iron oxide, copper oxide, nickel oxide, lithium manganese composite oxide (such as Li x mn 2 o 4 or Li x MnO ...

no. 3 approach

[0119] The battery pack according to the third embodiment has a plurality of the aforementioned non-aqueous electrolyte batteries (cells), and the cells are arranged electrically connected in series or in parallel.

[0120] refer to Figure 7 and Figure 8 Describe the battery pack in detail. single battery can be used image 3The flat battery shown.

[0121] by the aforementioned image 3 A plurality of unit cells 21 composed of the flat nonaqueous electrolyte batteries shown are stacked so that the negative terminal 6 and the positive terminal 7 extending outward face the same direction, and are tightly bound with an adhesive tape 22 to form a battery pack. twenty three. The single cell 21 as Figure 8 As shown, they are electrically connected in series with each other.

[0122] The printed wiring board 24 is disposed facing the side of the cell 21 from which the negative terminal 6 and the positive terminal 7 are extended. Such as Figure 8 As shown, the printed ci...

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Abstract

The present invention provides a negative electrode active material for a non-aqueous electrolyte battery, which comprises a compound having a crystal structure of monoclinic titanium dioxide, and the compound has the highest peak value measured by a powder X-ray diffraction method using a Cu-Kα ray source. The intensity peak is a peak on the (001) plane, (002) plane or (003) plane, and the half-value width (2θ) of the highest intensity peak is 0.5 deg to 4 deg.

Description

technical field [0001] The invention relates to a negative electrode active material for a nonaqueous electrolyte battery, a nonaqueous electrolyte battery and a battery pack. Background technique [0002] Non-Patent Document 1 discloses monoclinic titanium dioxide. In addition, Patent Document 1 discloses the use of titanium oxide TiO with a bronze structure. 2 lithium-ion battery. Patent Document 2 discloses a lithium secondary battery using titanium dioxide having a titanate-bronze-type crystal structure in which the (110) plane peak is the highest intensity peak. [0003] Patent Document 3 describes a titanic acid compound in which the (003) plane peak is the highest intensity peak, but the half-value width (2θ) of the highest intensity peak is 0.4 deg. Therefore, the reversible charge and discharge capacity becomes low. [0004] The battery capacities of Patent Documents 1 to 3 are significantly lower than the theoretical capacity of about 330 mAh / g when monoclinic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/40
CPCH01M4/13H01M4/131H01M4/485H01M2004/027H01M2004/021H01M4/02Y02E60/122Y02E60/10
Inventor 原田康宏高见则雄稻垣浩贵保科圭吾大谷友希
Owner KK TOSHIBA
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