Nonaqueous electrolyte secondary battery and producing method thereof

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., and can solve the problem of battery capacitance drop and other issues

Inactive Publication Date: 2003-06-04
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, if the above method is to be used to greatly improve the high-temperature characteristics, the pH value of the filtrate must be reduced to below 9.8, and if the pH value of the filtrate is to be lowered, a large amount of halogen (fluorine) must be added, and the percentage of the halogen content exceeds that of the positive electrode active material. 5% of the total, which results in a drop in battery capacitance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] (Preparation of positive electrode)

[0019] As the starting material, lithium carbonate (Li 2 CO 3 ) As a lithium source, (Co 0.999 V 0.001 ) 3 o 4 as a source of cobalt. The cobalt and vanadium dissolved in the acid solution are precipitated in the form of composite hydroxide, and then calcined at 300°C to obtain a substance composed of vanadium composite tricobalt tetroxide. Next, weigh lithium carbonate and the material formed by compounding tricobalt tetroxide with vanadium, so that the Li / (Co+V) molar ratio therein reaches 1, and then add MgF 2 , making the fluorine content 0.01% by weight with respect to the total amount of positive electrode active materials, and mixing these compounds. Afterwards, the mixture was calcined under air conditions to obtain hexagonal LiCo containing fluorine and magnesium. 0.999 V 0.001 o 2 The calcined body was then pulverized with a mortar to an average particle size of 10 μm as a positive electrode active material.

[...

Embodiment 1

[0033] In Example 1, a battery prepared in the same manner as described in the above-described embodiment of the invention was used.

[0034] The battery thus produced is referred to as Inventive Battery A1.

Embodiment 2～7

[0036] In addition to setting the halogen (fluorine) content relative to the total amount of the positive electrode active material as 0.0005% by weight, 0.0007% by weight, 0.001% by weight, 1% by weight, 5% by weight, and 7% by weight, it is used in the implementation The same method as Example 1 was used to prepare the battery.

[0037]The batteries thus prepared are respectively referred to as batteries A2 to A7 of the present invention.

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Abstract

The present invention provides a nonaqueous electrolyte secondary cell having a positive electrode composed mainly of a positive electrode active material, a negative electrode, and a nonaqueous electrolyte. The positive electrode active material is a lithium-containing transition metal composite oxide of a hexagonal crystal system that includes a compound represented by the general formula LiCo1-xMxO2, where M is at least one species selected from the group consisting of V, Cr, Fe, Mn, Ni, Al, and Ti, magnesium, and halogen. In a nonaqueous electrolyte secondary cell having such a construction, the high-temperature characteristics are improved without reducing the cell capacity.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery comprising a positive electrode mainly composed of a positive electrode active material, a negative electrode, and a nonaqueous electrolyte, and a method for manufacturing the same. Background technique [0002] In recent years, non-aqueous electrolyte batteries that use lithium-containing composite oxides such as lithium cobaltate as positive electrode materials, and lithium-aluminum alloys that can absorb or desorb lithium ions, and carbon materials as negative electrodes have become a promising solution for high-capacitance batteries. attention to the battery. [0003] However, it is well known that the above-mentioned lithium cobalt oxide has poor thermal stability in a charged state. Therefore, the commonly used methods include changing the synthesis conditions when preparing lithium cobaltate (such as increasing the calcination temperature, prolonging the calcination tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/02H01M4/131H01M4/38H01M4/52H01M4/525H01M10/052H01M10/36
CPCH01M4/388Y02E60/122H01M4/525H01M2004/028H01M10/052H01M4/38H01M4/131Y02E60/10Y10T29/49108Y02P70/50H01M4/36
Inventor 宫崎晋也西田伸道
Owner SANYO ELECTRIC CO LTD
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