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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes, etc., can solve the problems of improvement, inability to obtain high-temperature storage characteristics, etc., to improve high-temperature durability, suppress side reactions, Effect of suppressing surface deterioration

Inactive Publication Date: 2005-11-30
SANYO ELECTRIC CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, as mentioned above, when only zirconium is added, sufficient improvement in high-temperature storage characteristics cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] [Production of Lithium Transition Metal Composite Oxide]

[0025] Will Li 2 CO 3 , (Ni 0.4 co 0.3 mn 0.3 ) 3 o 4 , ZrO 2 , B 2 o 3 , according to Li:(Ni 0.4 co 0.3 mn 0.3 ): Zr: B = 1.00: 0.99: 0.005: 0.005, and the mixture was fired at 900°C for 20 hours in an air atmosphere to obtain LiNi 0.396 co 0.297 mn 0.297 Zr 0.005 B 0.005 o 2 .

[0026] [making of positive electrode]

[0027] The lithium-transition metal composite oxide produced as described above and the lithium-manganese composite oxide (Li 1.1 mn 1.9 o 4 ) were mixed so that the weight ratio (lithium transition metal composite oxide: lithium manganese composite oxide) was 7:3, and the mixture was used as a positive electrode active material. This mixture (positive electrode active material), and the carbon material as conductive agent, and the N-methyl-2-pyrrolidone solution that is dissolved with the polyvinylidene fluoride as adhesive agent, according to the weight ratio of active mat...

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PUM

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Abstract

The nonaqueous electrolyte secondary battery is equipped with a positive electrode containing the lithium transition metal composite oxide having layer structure, a negative electrode containing a negative active material capable of storing or releasing lithium, and a nonaqueous electrolyte having lithium ion conductivity, and boron and at least one kind of group IVa elements are added to the lithium transition metal composite oxide. The objective of the invention is to enhance high-temperature durability (high-temperature storage characteristics) in a nonaqueous electrolyte secondary battery using a lithium transition metal composite oxide having layer structure as a positive active material.

Description

technical field [0001] The present invention relates to nonaqueous electrolyte secondary batteries such as lithium secondary batteries. Background technique [0002] Lithium transition metal composite oxides with layered structure such as lithium cobalt oxide and lithium nickel oxide are used as non-aqueous electrolyte secondary batteries with a positive electrode active material. The voltage is as high as about 4V. In addition, in order to obtain a large capacity, it can be made density battery. However, when these positive electrode active materials are used, if they are left in a high-temperature environment in a charged state, there is a problem that the capacity of the battery decreases. [0003] In order to solve this problem, a technique of substituting the position of the transition metal in the lithium-transition metal composite oxide with a different element, or substituting the position of oxygen with fluorine has been proposed. For example, in order to suppress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/02H01M4/36H01M4/505H01M4/525
CPCH01M4/525H01M2004/028H01M10/0525H01M4/505H01M4/364Y02E60/122Y02E60/10H01M4/58H01M10/05
Inventor 藤原丰树北尾英树武田和久池町隆明能间俊之
Owner SANYO ELECTRIC CO LTD
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