Positive electrode active material for nonaqueous electrolyte secondary battery

一种正极活性材料、非水电解质的技术，应用在非水电解质蓄电池、二次电池、电池电极等方向，能够解决操作电压低等问题，达到操作电压高、性能优异的效果

Active Publication Date: 2007-10-31
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, using NaNiO 2 A nonaqueous electrolyte secondary battery as a positive electrode active material suffers from a low operating voltage, ie, about 2.0 V (see Patent Document 1)

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Synthesis of positive electrode active materials

[0073] Weigh Na 2 CO 3 , Ni(OH) 2 and TiO 2 so that Na, Ni and Ti have NaNi 0.5 Ti 0.5 o 2 stoichiometric ratios and subsequently mix them thoroughly by means of an agate mortar. The resulting mixture was kept at 700° C. for 12 hours in an argon atmosphere to perform preliminary firing, and thereafter the mixture was kept at 950° C. for 36 hours to be fired to obtain a positive electrode for a nonaqueous electrolyte secondary battery Active substance A1. Al was subjected to powder X-ray diffraction, and the measured results are shown in FIG. 1 . Al has a hexagonal crystal structure and the value obtained by dividing the XRD peak intensity of 2.20 Ȧ interplanar spacing by the XRD peak intensity of 5.36 Ȧ interplanar spacing is 1.5. The XRD peak intensity of 2.09 Ȧ interplanar spacing divided by the XRD of 2.20 Ȧ interplanar spacing A value of 0.03 was obtained for the peak intensity.

[0074] (2) Evaluation...

Embodiment 2

[0080] Using the Al obtained in Example 1, the same test cell as in Example 1 was fabricated and subjected to a constant current charge and discharge test under the following conditions.

[0081] Current density: 0.2mA / cm 2

[0082] Scan potential range: 1.5V-4.0V

[0083] The charge and discharge curves obtained at the first cycle and the second cycle are shown in FIG. 3 .

Embodiment 3

[0085] Using the Al obtained in Example 1, the same test cell as in Example 1 was fabricated and subjected to a constant current charge and discharge test under the following conditions.

[0086] Current density: 0.2mA / cm 2

[0087] Scan potential range: 1.5V-4.2V

[0088] The charge and discharge curves obtained at the first cycle and the second cycle are shown in FIG. 4 .

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Abstract

Disclosed is a positive electrode active material for nonaqueous electrolyte secondary batteries which contains a complex oxide mainly containing sodium, nickel and a tetravalent metal while having a hexagonal structure. This positive electrode active material enables to obtain a nonaqueous electrolyte secondary battery with high operating voltage. The complex oxide is preferably expressed as Na[Na(1 / 3-2x / 3)Ni(x-y)M(2 / 3-x / 3-y)A2y]O2 (wherein M represents one or more tetravalent metals, A represents one or more trivalent metals, 0 < x = 0.5, 0 = y < 1 / 6, AND X > y).

Description

technical field [0001] The present invention relates to positive electrode active materials for nonaqueous electrolyte secondary batteries. Background technique [0002] Nonaqueous electrolyte lithium secondary batteries have been pushed to practical use as secondary batteries for portable electronic devices and are widely used. However, LiCoO used as a positive electrode active material 2 It is a compound of Li and Co, which is less abundant and expensive as a resource, and a positive electrode active material for a nonaqueous electrolyte secondary battery is required, which includes a compound mainly containing those elements which are abundant in resources. [0003] Under certain conditions, the resource-rich NaNiO as a composite oxide of sodium and nickel 2 It has been suggested as a positive electrode active material for nonaqueous electrolyte secondary batteries (see Non-Patent Document 1). [0004] However, using NaNiO 2 A nonaqueous electrolyte secondary battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/40H01M4/02H01M4/131H01M4/52H01M4/525H01M10/054H01M10/36
CPCC01G53/006Y02E60/122C01P2002/72C01G53/42H01M4/525C01P2002/74H01M10/054C01G53/50H01M4/131C01P2002/78C01P2006/40Y02E60/10H01M4/58H01M4/02H01M10/05
Inventor 冈田重人山木准一高桥佑典中根坚次
Owner SUMITOMO CHEM CO LTD
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