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Composite, manufacturing method of composite, active material for nonaqueous electrolyte battery, and nonaqueous electrolyte battery

A technology of active substances and complexes, applied in the field of complexes, can solve the problems of peeling, easy capacity reduction, weak bonding and so on

Active Publication Date: 2016-02-10
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene tends to be weakly bonded to titanium-niobium composite oxides
Therefore, a non-aqueous electrolyte battery that contains a combination of graphene and titanium-niobium composite oxide and does not take any countermeasures for the combination of graphene and titanium-niobium composite oxide is likely to cause peeling when repeated cycles, and the capacity is likely to decrease.

Method used

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  • Composite, manufacturing method of composite, active material for nonaqueous electrolyte battery, and nonaqueous electrolyte battery
  • Composite, manufacturing method of composite, active material for nonaqueous electrolyte battery, and nonaqueous electrolyte battery
  • Composite, manufacturing method of composite, active material for nonaqueous electrolyte battery, and nonaqueous electrolyte battery

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no. 1 Embodiment approach

[0050] The first embodiment provides a complex. The composite includes a graphene sheet, a plurality of active material particles, and a carbon layer between the graphene sheet and the active material particles. The graphene sheet includes a monoatomic layer planar graphene sheet or a laminate of ten or less planar graphene sheets. The active material particles contain titanium-niobium composite oxide. The carbon layer contains a carbon material having a π-electron system.

[0051] In the complex of the first embodiment, the graphene sheet can function as a conductive path between a plurality of active material particles.

[0052] On the other hand, due to its size, when used in a non-aqueous electrolyte battery, a graphene sheet has properties such as a solvent for an electrolyte and easy mobility when ions flow. However, the carbon layer contained in the composite of the first embodiment is located between the graphene sheet and the active material particles and contains ...

no. 2 Embodiment approach

[0112] The second embodiment provides a method for producing a composite. The method includes the following steps: a step of preparing a plurality of active material particles; a step of preparing an organic compound; a step of preparing a graphene sheet raw material; putting a plurality of active material particles, an organic compound, and a graphene sheet raw material into water to prepare a dispersed The process of the solution; the process of adjusting the pH of the dispersion solution to less than 2.5; the process of removing water from the dispersion solution to obtain a solid mixture; and the process of heating the solid mixture under an inert atmosphere. The active material particles contain titanium-niobium composite oxide. Organic compounds have multiple hydroxyl groups. The graphene sheet raw material contains a monoatomic layer planar graphene oxide sheet or a laminate of ten or less planar graphene oxide sheets.

[0113] Hereinafter, the manufacturing method of...

no. 3 Embodiment approach

[0150] A third embodiment provides an active material for a non-aqueous electrolyte battery including the complex of the first embodiment.

[0151] As described in the description of the first embodiment, the complex of the first embodiment may be used as a negative electrode of a non-aqueous electrolyte battery, or may be used as a positive electrode.

[0152] The active material for a non-aqueous electrolyte battery of the third embodiment may contain only the composite of the first embodiment or may further contain active material particles of the composite of the first embodiment when used as a negative electrode active material. Other active substances that contain different active substances. Examples of such other active materials include lithium-titanium composite oxides (Li 4 Ti 5 o 12 etc.), titanium oxides with anatase, rutile or monoclinic β-type structures (a-TiO 2 , r-TiO 2 or TiO 2 (B) etc.) and iron complex sulfides (FeS, FeS 2 Wait).

[0153] The activ...

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Abstract

The invention provides a composite, a manufacturing method of a composite, an active material for a nonaqueous electrolyte battery, and a nonaqueous electrolyte battery, wherein the composite exhibits an excellent capacity maintaining rate. According to one embodiment, there is provided a composite (10). The composite (10) comprises graphene sheet material (13), active material particles (11), and a carbon layer (12) located between the graphene sheet material (13) and the active material particles (11). The graphene sheet material (13) a planar graphene sheet of a monoatomic layer or a laminate of 10 layers or less of the planar graphene sheets. The active material particles (11) include a titanium-niobium composite oxide. The carbon layer (12) includes a carbon material having a [pai]-electron system.

Description

technical field [0001] Embodiments of the present invention relate to a complex, a method for producing the complex, an active material for a nonaqueous electrolyte battery, and a nonaqueous electrolyte battery. Background technique [0002] In recent years, lithium ion secondary batteries are being developed as high energy density batteries. Lithium-ion secondary batteries are expected to be used as power sources for hybrid vehicles and electric vehicles. In addition, lithium-ion secondary batteries are also expected to be used as uninterruptible power supplies for mobile phone base stations. Therefore, in addition to high energy density, lithium-ion secondary batteries also require characteristics such as fast charge and discharge performance and long-term reliability. For example, lithium-ion secondary batteries that can be quickly charged and discharged have the advantage of significantly shortening the charging time. In addition, lithium-ion secondary batteries that ...

Claims

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Application Information

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IPC IPC(8): H01M10/05H01M4/62H01M10/052H01M4/36
CPCH01M4/364H01M4/625H01M10/05H01M10/052C01G33/00H01M10/0525C01G33/006C01P2002/72C01P2004/60C01P2004/80C01P2006/12C01P2006/22Y02P20/133H01M4/366H01M4/131H01M4/485Y02E60/10H01M10/054H01M2220/20
Inventor 内藤胜之原田康宏吉永典裕赤坂芳浩吉田赖司伊势一树
Owner KK TOSHIBA
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