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Positive electrode active material for non-aqueous electrolyte secondary battery, process for production of same, and non-aqueous electrolyte secondary battery produced using same

A cathode active material, non-aqueous electrolyte technology, applied in the field of non-aqueous electrolyte secondary batteries, can solve the problems of reduced battery characteristics, deformation, lack of oxygen, and a large amount of heat, and achieves high mass productivity, inhibition of oxygen deficiency, The effect of suppressing deformation

Inactive Publication Date: 2012-09-12
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the conventional method of adding various elements to replace elements in the crystal in order to ensure the structural stability of lithium nickelate requires a lot of heat and requires calcination at high temperature.
[0011] When calcined at high temperature, due to the volatilization of lithium ions that are constituent elements of lithium nickelate and oxygen deficiency, crystal deformation and oxygen deficiency are likely to occur, thereby deteriorating battery characteristics.

Method used

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  • Positive electrode active material for non-aqueous electrolyte secondary battery, process for production of same, and non-aqueous electrolyte secondary battery produced using same
  • Positive electrode active material for non-aqueous electrolyte secondary battery, process for production of same, and non-aqueous electrolyte secondary battery produced using same
  • Positive electrode active material for non-aqueous electrolyte secondary battery, process for production of same, and non-aqueous electrolyte secondary battery produced using same

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A nickel-cobalt mixed aqueous solution obtained by adding and dissolving sulfate in a nickel sulfate aqueous solution having an amount corresponding to 60 g / L of metallic nickel so that the molar ratio of Co satisfies Ni:Co=80:20 was prepared. In addition, a 25% by mass sodium hydroxide aqueous solution was used as an alkali agent. The nickel-cobalt mixed aqueous solution whose salt concentration was controlled so that the conductivity reached 120mS / cm was introduced into a precipitation tank with a volume of 100L at a constant rate of 10L / h, and stirred sufficiently while introducing sodium hydroxide solution to generate the Desired composition of nickel hydroxide. The obtained nickel hydroxide was heated at 500° C., thereby preparing nickel oxide (average particle diameter: 10 μm) which is a nickel compound which is one of calcined materials.

[0058] The nickel oxide and lithium hydroxide were mixed so that the atomic ratio of lithium:(nickel+cobalt) reached 1.03:1, a...

Embodiment 2~60

[0076] A cylindrical lithium secondary battery was produced in the same manner as battery No. 1 except that positive electrode active material No. 2 to 60 was used instead of positive electrode active material No. 1 to obtain battery No. 2 to 60.

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Abstract

At the time of synthesis of lithium nickelate, by adding a firing aid to material to be fired, crystal growth is promoted at a temperature that is lower than a firing temperature necessary for obtaining desired crystal growth of lithium nickelate, and substitution of elements that contribute to structural stability in crystals is promoted. Furthermore, distortion of crystal or loss of oxygen at the time of synthesis is suppressed. Thus, a lithium ion secondary battery having excellent charge and discharge characteristics and cycling characteristics can be provided.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery, a method for producing the same, and a nonaqueous electrolyte secondary battery using the positive electrode active material. Background technique [0002] In recent years, the portability and wirelessization of electronic devices have rapidly progressed, and there is a high demand for small, lightweight secondary batteries with high energy density as power sources for driving them. From such viewpoints, nonaqueous secondary batteries, particularly lithium ion secondary batteries, are highly expected as batteries having high voltage and high energy density. At present, carbon materials are used in the negative electrode, and lithium cobaltate (LiCoO 2 ), Lithium-ion secondary batteries using organic electrolytes as electrolytes are being put into practical use. The potential of lithium cobalt oxide as the positive electrode active mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/00C01G53/00H01M4/505H01M10/0566H01M10/0587
CPCC01G53/00C01G53/006C01P2004/62C01P2006/40H01M4/485H01M4/505H01M4/525H01M10/052C01G51/44C01G53/42C01P2002/52Y02E60/10Y02P70/50H01M4/04C01G51/00
Inventor 平塚秀和
Owner PANASONIC CORP
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