Method of producing nitrided li-ti compound oxide, nitrided li-ti compound oxide, and lithium-ion battery

A composite oxide, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as battery voltage reduction and potential difference reduction, and achieve the effect of low reduction potential

Inactive Publication Date: 2010-11-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, despite the higher security, when using Li 4 Ti 5 o 12 When , the potential difference between the positive electrode active material and the negative electrode active material decreases, so the battery voltage decreases compared with the case of using carbon materials

Method used

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  • Method of producing nitrided li-ti compound oxide, nitrided li-ti compound oxide, and lithium-ion battery
  • Method of producing nitrided li-ti compound oxide, nitrided li-ti compound oxide, and lithium-ion battery
  • Method of producing nitrided li-ti compound oxide, nitrided li-ti compound oxide, and lithium-ion battery

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preparation example Construction

[0047] The preparation step of the present invention is a step of preparing a raw material composition comprising a raw material containing Li, Ti, and O and nitrogen represented by the above general formula (1) and which is solid or liquid at room temperature (25° C.) agent.

[0048] (1) Raw material

[0049] In the present invention, the raw material contains Li, Ti and O. The raw material may be a Li—Ti composite oxide (raw material compound), or may be a mixture of various compounds (raw material mixture) from which a Li—Ti composite oxide can be synthesized. Each of these cases will be described below.

[0050] (i) When the raw material is Li-Ti composite oxide

[0051] In this case, the raw material is not particularly limited as long as the raw material is a compound (Li—Ti composite oxide) containing all of Li, Ti, and O. Examples of such Li-Ti composite oxides include composite oxides having a spinel structure and composite oxides having a ramsdellite structure. ...

no. 1 approach

[0082] The first embodiment of the nitrided Li-Ti composite oxide of the present invention is a nitrided Li-Ti composite oxide having Li, Ti, O, and N and characterized by being in a crystalline state. The fact that the nitrided Li-Ti composite oxide is crystalline can be confirmed by X-ray diffraction (XRD).

[0083] The first embodiment provides a nitrided Li-Ti composite oxide having a low reduction potential. In addition, since this nitrided Li-Ti composite oxide is in a crystalline state, it has the advantage that the reversibility of Li ion insertion and extraction is higher compared to the case where the nitrided Li-Ti composite oxide is in an amorphous state. And the battery voltage is more highly stable. Above JP-A-2006-32321 No. description, active material is amorphous (for example its claim 2 and image 3 ). However, it is not stated therein that the active material is in a crystalline state. Even when Li-Ti composite oxides (such as Li 4 Ti 5 o 12 ) during ...

no. 2 approach

[0091] Next, a second embodiment of the nitrided Li-Ti composite oxide of the present invention will be described. Nitrided Li-Ti composite oxide of the second embodiment is a nitrided Li-Ti composite oxide having Li, Ti, O, and N and characterized by being composed of Li a Ti b o c N d Compounds represented by (0

[0092]According to the second embodiment, since the nitrided Li—Ti composite oxide has the above composition, a nitrided Li—Ti composite oxide having a low reduction potential is obtained. In No. JP-A-2006-32321 cited above, a general formula: Li x TiO y N z (wherein 0≤x≤2, 0.1x Ti 5 o Y N Z (Where 0≤X≤10, 0.5a Ti b o c (e.g. Li 4 Ti 5 o 12 ) in the case of nitriding, the nitrided Li-Ti composite oxide represented by the above general formula (B-1) cannot be obtained either. When ammonia is used, sufficient nitriding cannot be performed, so i...

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Abstract

Provided is a method of producing a nitrided Li-Ti compound oxide, including: preparing a raw material composite that has a raw material containing lithium, titanium, and oxygen and a nitriding agent that is expressed by a following General Formula (1) and is solid or liquid at room temperature (25 DEG C.); and synthesizing the nitrided Li-Ti compound oxide by firing the raw material composite to nitride the raw material. R1, R2, and R3 are independent of each other and are each a functional group having at least one of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N).

Description

technical field [0001] The present invention relates to a method of producing, for example, a nitrided Li-Ti composite oxide suitable as a negative electrode active material, a nitrided Li-Ti composite oxide, and a lithium ion battery. Background technique [0002] Lithium ion batteries have high electromotive force and high energy density, and have been widely implemented in the fields of information-related equipment and communication equipment. Meanwhile, in the field of automobiles, development of electric vehicles and hybrid vehicles is an urgent matter in terms of environmental issues and resource issues, and as a power source for these vehicles, lithium ion batteries are being researched. The lithium ion battery typically has a positive electrode active material layer containing a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, and an electrolyte layer formed between the positive electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/0525
CPCH01M4/58Y02E60/122H01M10/0525Y02T10/7011H01M2004/021Y02E60/10Y02T10/70
Inventor 大木荣干濑口敏弘
Owner TOYOTA JIDOSHA KK
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