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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of structural deterioration of positive active materials and electrolyte decomposition, and achieve the effect of good charge-discharge cycle characteristics

Active Publication Date: 2007-10-10
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the end-of-charge voltage of the battery is increased and the depth of charge of the positive electrode is deepened, the structural deterioration of the positive electrode active material and the decomposition of the electrolyte on the surface of the positive electrode are likely to occur.
Therefore, the deterioration caused by the charge-discharge cycle becomes more significant than the case where the conventional 4.1-4.2V is used as the end-of-charge voltage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] [Production of positive electrode active material]

[0051] Will Li 2 CO 3 、Co 3 o 4 , ZrO 2 and MgO according to the molar ratio of Li: Co: Zr: Mg of 1: 0.99: 0.005: 0.005 in the Ishikawa-type grinding and stirring mortar, heat treatment at 850 ° C for 24 hours under the air atmosphere, and then carry out Pulverized, thus obtained the average particle size of 13.9μm, BET specific surface area of ​​0.4m 2 / g of lithium transition metal oxide.

[0052] [making of positive electrode]

[0053] The positive electrode active material obtained above, carbon as a conductive agent, and polyvinylidene fluoride as a binder are added to N-methyl-2-pyrrolidone in a weight ratio of 90:5:5, and kneaded , to make positive electrode slurry. The prepared slurry was coated on an aluminum foil as a current collector, dried, and then rolled using a calender roll, and a current collecting sheet was attached to form a positive electrode.

[0054] [Production of Negative Electrode] ...

Embodiment 2

[0062] In the production of positive electrode active materials, in addition to Li 2 CO 3 、Co 3 o 4 , ZrO 2 and MgO according to the molar ratio of Li: Co: Zr: Mg being 1: 0.99: 0.0075: 0.0025 except that the molar ratio is mixed, all the other are made positive electrode active material in the same way as in Example 1, adopt this positive electrode active material to make non-aqueous electrolyte secondary Battery A2. The average particle size of the obtained positive electrode active material was 14.0 μm, and the specific surface area of ​​BET was 0.39 m 2 / g.

Embodiment 3

[0064] In the production of positive electrode active materials, in addition to Li 2 CO 3 、Co 3 o 4 , ZrO 2 and MgO according to the molar ratio of Li: Co: Zr: Mg being 1: 0.99: 0.0025: 0.0075 except that the molar ratio is mixed, all the other are made positive electrode active material in the same way as in Example 1, adopt this positive electrode active material to make non-aqueous electrolyte secondary Battery A3. The average particle size of the obtained positive electrode active material was 14.2 μm, and the specific surface area of ​​BET was 0.32 m 2 / g.

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Abstract

A nonaqueous electrolyte secondary battery comprising a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte is characterized in that the positive electrode active material is composed of a lithium transition metal oxide having a layer structure and containing Li and Co and further contains a group IVA element and group IIA element of the periodic table.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery and a method for using the same. technical background [0002] In recent years, metal lithium, or alloys that can store and release lithium ions, or carbon materials, etc., have been used as negative electrode active materials, and the chemical formula LiMO 2 The lithium transition metal composite oxide represented by (M is a transition metal) has attracted attention as a battery having a high energy density as a nonaqueous electrolyte secondary battery such as a positive electrode active material. [0003] As a representative example of the above-mentioned lithium transition metal composite oxide, lithium cobaltate (LiCoO 2 ), it has been practically used as a positive electrode active material for non-aqueous electrolyte secondary batteries. However, it was confirmed that when the above-mentioned lithium cobaltate was used alone, the capacity decreased as the charge-discha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/02H01M10/40H01M4/62H01M4/131H01M4/525H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 高桥康文藤本洋行木下晃藤原丰树户出晋吾中根育朗藤谷伸
Owner SANYO ELECTRIC CO LTD
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