Positive electrode active material for nonaqueous electrolyte secondary battery and method for producing same

A positive electrode active material and non-aqueous electrolyte technology, applied in battery electrodes, circuits, nickel compounds, etc., can solve the problem of high process costs and achieve the effect of suppressing the formation of impurities

Inactive Publication Date: 2011-11-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the raw material mixture is fired in oxygen, there is a problem that the process cost becomes high

Method used

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  • Positive electrode active material for nonaqueous electrolyte secondary battery and method for producing same
  • Positive electrode active material for nonaqueous electrolyte secondary battery and method for producing same
  • Positive electrode active material for nonaqueous electrolyte secondary battery and method for producing same

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preparation example Construction

[0041] The production method of the hydroxide is not particularly limited. However, from the viewpoint of easy synthesis of the lithium-nickel composite oxide, it is desirable to incorporate the element L into the crystal structure of the nickel-containing hydroxide, and it is desirable to form a solid solution of nickel and the element L. Such a solid solution can be synthesized by, for example, coprecipitation. In the co-precipitation method, in order not to aggregate elements that are more easily oxidized than Ni, it is preferable to precipitate the hydroxide in a reducing atmosphere.

[0042] In the case of the co-precipitation method, for example, a method of preparing an aqueous solution of a raw material salt mixture containing nickel and the element L in a predetermined molar ratio and adding a base thereto to obtain a co-precipitated hydroxide can be mentioned. At this time, the pH in the aqueous solution is preferably 7-14. Moreover, it is preferable that water tem...

Embodiment 1

[0081] (i) Synthesis of nickel-containing hydroxide

[0082] 3.2 kg of a mixture of nickel sulfate and cobalt sulfate obtained by mixing Ni atoms to Co atoms in a molar ratio of 80:20 was dissolved in 10 L of water to obtain a raw material solution. 400 g of sodium hydroxide was added to the raw material solution to generate a precipitate. The precipitate was sufficiently washed with water and dried to obtain a co-precipitated hydroxide.

[0083] (ii) Addition of oxygen-permeable ceramics

[0084] A solution in which calcium sulfate and zirconium sulfate were dissolved in ion-exchanged water at a molar ratio of 3:17 was prepared. The co-precipitated hydroxide (Ni 0.8 co 0.2 (OH) 2 ) was dispersed in 3 L of the solution, stirred at 25° C. for 3 hours, and then dried at 100° C. for 2 hours to obtain an intermediate of a composite oxide. The added amount of the oxygen-permeable ceramic precursor determined from the weight increase rate was 0.5 parts by weight per 100 parts ...

Embodiment 2

[0108] In the synthesis process of hydroxide, the molar ratio of Ni atoms to Co atoms is set to 60:40 to synthesize Ni 0.6 co 0.4 (OH) 2 , except for using it, a battery was produced in the same manner as in Example 1, and the capacity retention rate was obtained in the same manner. The capacity maintenance rate was 75%.

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Abstract

Disclosed is a method for producing a positive electrode active material for a nonaqueous electrolyte secondary battery, which comprises: a step in which an intermediate is prepared by having an oxygen permeable ceramic or a precursor thereof adhere to the surface of an oxide or hydroxide that contains nickel; a step in which the intermediate and a lithium compound are mixed together; and a step in which the thus-obtained mixture is fired in the air, thereby synthesizing a lithium nickel complex oxide. The step of having an oxygen permeable ceramic or a precursor thereof adhere includes a process of having the oxygen permeable ceramic or a precursor thereof deposit on the surface of the oxide or hydroxide, for example, in an aqueous alkaline solution.

Description

technical field [0001] This invention mainly relates to the improvement of the manufacturing method of the lithium nickel composite oxide used for the positive electrode active material of a nonaqueous electrolyte secondary battery. Background technique [0002] Lithium-ion secondary batteries represented by non-aqueous electrolyte secondary batteries have high electromotive force and high energy density. Therefore, the demand for lithium ion secondary batteries as a main power source of mobile communication equipment and portable electronic equipment is increasing. [0003] Currently, most commercially available lithium ion secondary batteries contain lithium composite oxides containing cobalt as a main component as a positive electrode active material. However, since the cost of raw materials for lithium composite oxides containing cobalt as a main component is high, research on lithium composite oxides containing nickel as a main component (lithium-nickel composite oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/36
CPCY02E60/122C04B2235/5436H01M4/131C01G51/006C04B2235/3217C01P2002/54C01G53/006C04B2235/3275C04B2235/3279C01G53/42H01M4/525C01G53/00C01P2004/61C01G51/04C04B2235/3203C04B2235/448H01M4/366C04B2235/3208C04B35/62823C04B35/62886C04B35/6261C01P2006/40C01G53/04Y02E60/10
Inventor 名仓健祐
Owner PANASONIC CORP
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