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Non-aqueous electrolyte secondary battery

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Non-aqueous electrolyte secondary battery


According to one embodiment, there is provided a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material layer, a negative electrode including a negative electrode active material layer, and a non-aqueous electrolyte. At least one of the positive electrode active material layer and the negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 10 ml per 1 g when heated at 350° C. for 1 minute.
Related Terms: Carbon Dioxide Electrode Electrolyte

Browse recent Kabushiki Kaisha Toshiba patents - Tokyo, JP
USPTO Applicaton #: #20130330627 - Class: 429223 (USPTO) - 12/12/13 - Class 429 
Chemistry: Electrical Current Producing Apparatus, Product, And Process > Current Producing Cell, Elements, Subcombinations And Compositions For Use Therewith And Adjuncts >Electrode >Chemically Specified Inorganic Electrochemically Active Material Containing >Nickel Component Is Active Material

Inventors: Shinsuke Matsuno, Hiromichi Kuriyama, Hideki Satake, Takashi Kuboki

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The Patent Description & Claims data below is from USPTO Patent Application 20130330627, Non-aqueous electrolyte secondary battery.

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CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application of PCT Application No. PCT/JP2012/053071, filed Feb. 10, 2012 and based upon and claiming the benefit of priority from Japanese Patent Application No. 2011-033448, filed Feb. 18, 2011, the entire contents of all of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a non-aqueous electrolyte secondary battery.

BACKGROUND

A lithium ion secondary battery using lithium titanate such as Li4Ti5O12 as a negative electrode active material has been recently developed. In such a lithium ion secondary battery, it is known that carbon dioxide is adsorbed as an impurity at the negative electrode. Carbon dioxide may react with the negative electrode active material and thereby, produce a large amount of gas. Such a reaction is remarkable particularly when the battery was stored at a temperature equal to or higher than room temperature. If a large amount of gas is generated, the battery internal pressure increases. Further, in such a case, plastic deformation of the battery may occur.

In addition, it is known that an SEI (Solid Electrolyte Interface) coating (hereinafter, referred to as a coating) is formed on the surface of a negative electrode active material of a lithium ion secondary battery. This coating is produced mainly due to the reductive decomposition of a non-aqueous electrolyte. Reaction between an active material and the non-aqueous electrolyte can be suppressed by this coating. However, when the coating is too thick, diffusion resistance of the lithium ion becomes larger. As a result, the large current performance is reduced. On the other hand, when the coating is too thin, the reaction of the non-aqueous electrolyte with the active material is less likely to be suppressed. As a result, self-discharge during storage of the battery is increased.

CITATION LIST Patent Literature

Patent Literature 1: Jpn. Pat. Appin. KOKAI Publication No. 2002-216843

Patent Literature 2: Jpn. Pat. Appin. KOKAI Publication No. 11-339856

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view of a non-aqueous electrolyte secondary battery according to the embodiment;

FIG. 2 is an enlarged sectional view of section A shown in FIG. 1;

FIG. 3 is a measurement chart of the negative electrodes according to Examples and Comparative Example by pyrolysis GC/MS; and

FIG. 4 is a measurement chart of the positive electrode according to Example 1 by pyrolysis GC/MS.

DETAILED DESCRIPTION

There is provided a non-aqueous electrolyte secondary battery which shows a suppression of gas generation during its storage as well as shows a suppression of self-discharge reaction.

In general, according to one embodiment, there is provided a non-aqueous electrolyte secondary battery comprising a positive electrode including a positive electrode active material layer; a negative electrode including a negative electrode active material layer; and a non-aqueous electrolyte. At least one of the positive electrode active material layer and the negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 10 ml per 1 g when heated at 350° C. for 1 minute.

Hereinafter, embodiments will be explained with reference to the drawings.



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Previous Patent Application:
Lithium nickel cobalt composite oxide cathode material
Next Patent Application:
Positive electrode active material for nonaqueous electrolyte secondary battery, positive electrode for nonaqueous electrolyte secondary battery using the positive electrode active material, and nonaqueous electrolyte secondary battery using the positive
Industry Class:
Chemistry: electrical current producing apparatus, product, and process
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stats Patent Info
Application #
US 20130330627 A1
Publish Date
12/12/2013
Document #
13969104
File Date
08/16/2013
USPTO Class
429223
Other USPTO Classes
4292181, 42923195, 429224, 4292315
International Class
/
Drawings
3


Carbon Dioxide
Electrode
Electrolyte


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