Positive electrode material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and positive electrode material technology, which is applied in the field of positive electrode materials for non-aqueous electrolyte secondary batteries and non-aqueous electrolyte secondary batteries, can solve the problem of LiCoO2 structural deterioration of the positive electrode surface electrolyte, discharge capacity charge-discharge cycle characteristics degradation, no Sufficient and other issues, to achieve good charge-discharge cycle characteristics, good thermal stability and high discharge capacity, high thermal stability effect

Inactive Publication Date: 2008-03-19
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although the specific situation is not clear, it is generally believed that if the end-of-charge voltage of the battery is increased, it is easy to generate LiCoO 2 Structural deterioration of the positive electrode surface electrolyte and decomposition
Therefore, there is a problem that deterioration due to charge-discharge cycles becomes more significant than in the case of using 4.1 to 4.2V as the end-of-charge voltage of the prior art
However, in these methods, the suppression of deterioration of thermal stability, discharge capacity, and charge-discharge cycle characteristics is not sufficient.

Method used

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  • Positive electrode material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Positive electrode material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Positive electrode material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Mixing Li in a stone grinder mortar 2 CO 3 and Co 3 o 4 , making the molar ratio of Li:Co 1:1. Then it was heat-treated at 850°C for 24 hours in an air atmosphere, and then it was pulverized to obtain LiCoO with an average particle diameter of about 14 μm. 2 .

[0072] 1.32g (0.01mol) of (NH 4 ) 2 HPO 4 Dissolve in 20ml of water and add NH to it 3 (aq) Make pH 10 or more. Add 25g of LiCoO produced above to this solution 2 , after that, slowly add 3.75g (0.01mol) Al(NO 3 ) 3 The solution. The solution formed by the above method was stirred for 10 minutes, after that, centrifuged at 2000rpm, after removing the clear part above, stirred in the solution formed after dissolving 0.69g (0.03mol) LiOH in 100ml water, and again with Centrifuge at 2000rpm to remove the above clarified part. After that, it was fired at 400° C. for 5 hours in air to obtain the positive electrode material of Example 1.

[0073] [making of positive electrode]

[0074] Dissolve polyvin...

Embodiment 2

[0089]The positive electrode active material was obtained in the same manner as in Example 1, and the positive electrode was produced. Then, in the three-electrode cup battery, the following evaluation methods were used for evaluation, and the electrochemical characteristics, thermal stability.

[0090] (Charge termination potential is 4.5V (vs.Li / Li + ) evaluation method of electrochemical characteristics)

[0091] [Evaluation of initial charge and discharge characteristics]

[0092] At room temperature, at 0.75mA / cm 2 (about 0.3C) constant current charges the fabricated three-electrode cup battery until the potential of the working electrode reaches 4.5V (vs.Li / Li + ), moreover, at 0.25mA / cm 2 (about 0.1C) constant current to charge it until the potential reaches 4.5V (vs.Li / Li + ), after that, at 0.75mA / cm 2 (about 0.3C) constant current discharges it until the potential reaches 2.75V (vs.Li / Li + ), thereby evaluating the initial charge-discharge characteristics.

...

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Abstract

A positive electrode material for a nonaqueous electrolyte secondary battery is obtained which attains good thermal stability and high discharge capacity and shows satisfactory charge-discharge cycle performance characteristics. A nonaqueous electrolyte secondary battery using the positive electrode material is also obtained. Characteristically, the positive electrode material for a nonaqueous electrolyte secondary battery contains a positive active material (e.g., lithium-containing layered complex oxide) capable of lithium storage and release, a lithium phosphate compound such as Li3PO4, and Al2O3. The lithium phosphate compound and Al2O3 are preferably disposed near the positive active material.

Description

technical field [0001] The present invention relates to a positive electrode material for a nonaqueous electrolyte secondary battery, a nonaqueous electrolyte secondary battery using the positive electrode material, and a method for producing the positive electrode material for a nonaqueous electrolyte secondary battery. Background technique [0002] The miniaturization and weight reduction of mobile information terminals such as mobile phones, portable personal computers, and PDAs are rapidly developing. As the driving power of these devices, alloys or carbon materials that can store and release metallic lithium or lithium ions are used as negative electrode active materials. In chemical formula: LiMO 2 (M is a transition metal) non-aqueous electrolyte battery in which a lithium transition metal composite oxide represented by a positive electrode active material is widely used as a battery having a high energy density. In recent years, there has been a demand for higher ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/58H01M4/62H01M4/04B01J19/00H01M10/40H01M4/02H01M4/36H01M4/485H01M4/525H01M10/05
CPCY02E60/122H01M4/5825H01M2004/028H01M4/525H01M4/485H01M4/62H01M10/052H01M10/4235H01M4/13H01M4/366Y02E60/10
Inventor 板谷昌治户出晋吾千贺贵信中村宏
Owner SANYO ELECTRIC CO LTD
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