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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of increased lithium ion diffusion resistance, increased self-discharge, and decreased high current characteristics. question

Active Publication Date: 2013-07-17
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the coating is too thick, the diffusion resistance of lithium ions increases
As a result, the large current characteristics degrade
On the other hand, if the film is too thin, it is difficult to suppress the reaction of the active material and the non-aqueous electrolyte.
As a result, the self-discharge of the battery during storage increases

Method used

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Examples

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Effect test

Embodiment 1）

[0074]

[0075] As the negative electrode active material, the lithium intercalation potential is 1.55V (relative to Li / Li + ) spinel structure lithium titanium oxide (Li 4 Ti 5 o 12 ). Will Li 4 Ti 5 o 12 90% by mass of the powder, 5% by mass of graphite, and 5% by mass of PVdF were added to NMP and mixed to prepare a slurry. Preparation of the slurry was performed in an atmosphere having a carbon dioxide concentration of 0.01% and a dew point of -10°C. Slurry dispersion using zirconia beads was performed for 3 hours.

[0076] The prepared slurry was coated on both surfaces of a current collector made of an aluminum foil having a thickness of 11 μm, dried under the same atmosphere as that used for the preparation of the slurry, and then pressurized. Thus, the fabric has a density of 2.0g / cm 3 The negative electrode of the negative electrode active material layer.

[0077]

[0078] As the positive electrode active material, lithium nickel cobalt oxide (LiNi 0.8 co...

Embodiment 2～15）

[0093] A secondary battery was produced in the same manner as in Example 1, except that the atmosphere and conditions for producing the negative electrode and positive electrode slurries were changed. Those described in Table 1 and Table 2 were used for the negative electrode active material and the positive electrode active material. About each electrode, it measured similarly to Example 1. Table 1 and Table 2 show the amount of carbon dioxide, the presence or absence of two or more peaks in the range from 120° C. to 350° C., and the peak intensity ratio (a / b).

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Abstract

Provided is a non-aqueous electrolyte secondary battery (1) equipped with; a cathode (4) containing a cathode active material layer (4a); an anode (5) containing an anode active material layer (5a); and a non-aqueous electrolyte. The cathode active material layer (4a) and / or the anode active material layer (5a) contains carbon dioxide, and when heated for one minute at 350 DEG C, releases 0.1-10 ml inclusive of carbon dioxide for every 1 g thereof.

Description

technical field [0001] Embodiments of the present invention relate to a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, the use of Li 4 Ti 5 o 12 A lithium ion secondary battery in which such lithium titanate is used as a negative electrode active material. It is known that in such a lithium ion secondary battery, carbon dioxide as an impurity is adsorbed on the negative electrode. Sometimes carbon dioxide reacts with the negative electrode active material to generate a large amount of gas. Such a reaction is remarkable especially when the battery is stored at a high temperature above room temperature. When a large amount of gas is generated, the battery internal pressure rises. Also, in this case, plastic deformation of the battery may occur. [0003] In addition, it is known that an SEI coating (SEI: Solid Electrolyte Interface, hereinafter referred to as “coating”) can be formed on the surface of a negative electrode active ...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/485H01M4/58H01M10/0525
CPCH01M4/5825H01M4/505Y02E60/122H01M4/525H01M4/131H01M4/13H01M4/485H01M10/0525Y02E60/10H01M10/05H01M2004/027H01M2004/028
Inventor 松野真辅栗山博道佐竹秀喜久保木贵志
Owner KK TOSHIBA
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