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Composite metal oxide, positive electrode active material, positive electrode, sodium secondary battery, and method for producing composite metal oxide

A cathode active material, composite metal technology, applied in active material electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of not being abundant in resources, depletion of lithium resources, etc., to achieve non-gelling, high water resistance, etc. , Improve the effect of coating

Active Publication Date: 2019-11-15
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium used in lithium secondary batteries is not abundant in terms of resources, and there is a concern that lithium resources will be exhausted in the future

Method used

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  • Composite metal oxide, positive electrode active material, positive electrode, sodium secondary battery, and method for producing composite metal oxide
  • Composite metal oxide, positive electrode active material, positive electrode, sodium secondary battery, and method for producing composite metal oxide
  • Composite metal oxide, positive electrode active material, positive electrode, sodium secondary battery, and method for producing composite metal oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0214] 153.7 mg of boric acid (H 3 BO 3 ) into an agate mortar, using sodium carbonate (Na 2 CO 3 ), manganese (IV) oxide (MnO 2 ), Iron(III) oxide (Fe 2 o 3 ) and nickel (II) oxide (NiO) as a metal-containing compound were weighed in a total of 15 g such that the molar ratio of Na:Mn:Fe:Ni was 0.99:0.35:0.30:0.35, put into an agate mortar, and then dried mixed to obtain a mixture.

[0215] The obtained mixture was filled in an alumina crucible, heated in an air atmosphere using an electric furnace, and kept at 900° C. for 12 hours as a second firing step after holding at 650° C. for 4 hours as a first firing step. Then, the above mixture was fired and cooled to room temperature to obtain composite metal oxide 1 (Na 0.99 mn 0.35 Fe 0.30 Ni 0.35 o 2 ). As a result of powder X-ray diffraction measurement of composite metal oxide 1, the crystal structure of composite metal oxide 1 belongs to α-NaFeO 2 type crystal structure ( figure 2 ). The α-NaFeO 2 The peak ha...

Embodiment 2

[0217] 153.6 mg of boric acid (H 3 BO 3 ) into an agate mortar, using sodium carbonate (Na 2 CO 3 ), manganese (IV) oxide (MnO 2 ), Iron(III) oxide (Fe 2 o 3 ) and nickel (II) oxide (NiO) as a metal-containing compound were weighed in a total of 15 g so that the molar ratio of Na:Mn:Fe:Ni was 0.99:0.30:0.40:0.30, put into an agate mortar, and then dried mixed to obtain a mixture.

[0218] The obtained mixture was filled in an alumina crucible, heated in an air atmosphere using an electric furnace, and kept at 900° C. for 12 hours as a second firing step after holding at 650° C. for 4 hours as a first firing step. Then, the above mixture was fired and cooled to room temperature, thereby obtaining the composite metal oxide 2 (Na 0.99 mn 0.30 Fe 0.40 Ni 0.30 o 2 ). The result of powder X-ray diffraction measurement of composite metal oxide 2 is that the crystal structure of composite metal oxide 2 belongs to α-NaFeO 2 type crystal structure ( image 3 ). The α-NaFe...

Embodiment 3

[0220] 153.2 mg of boric acid (H 3 BO 3 ) into an agate mortar, using sodium carbonate (Na 2 CO 3 ), manganese (IV) oxide (MnO 2 ), Iron(III) oxide (Fe 2 o 3 ) and nickel (II) oxide (NiO) as a metal-containing compound were weighed in a total of 15 g such that the molar ratio of Na:Mn:Fe:Ni was 0.99:0.31:0.41:0.28, put into an agate mortar, and then dried mixed to obtain a mixture.

[0221] The obtained mixture was filled in an alumina crucible, heated in an air atmosphere using an electric furnace, and kept at 900° C. for 12 hours as a second firing step after holding at 650° C. for 4 hours as a first firing step. Then, the above mixture was fired and cooled to room temperature, thereby obtaining the composite metal oxide 3 (Na 0.99 mn 0.31 Fe 0.41 Ni 0.28 o 2 ). The result of powder X-ray diffraction measurement of composite metal oxide 3 is that the crystal structure of composite metal oxide 3 belongs to α-NaFeO 2 type crystal structure ( Figure 4 ). The α-N...

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Abstract

Provided is a composite metal oxide which is represented by formula (1) and has an alpha-NaFeO2 type crystal structure, the composite metal oxide being characterized in that the peak width at half maximum of the (104) plane is 0.250 degree or less (2theta) as measured by powder X-ray diffraction. NaxM1 r(FeyNizMnwM1-y-z-w)O2+ / -delta (1) (In formula (1), M is B, Si, V, Ti, Co, Mo, Pd, Re, Pb, or Bi, M1 is Mg or Ca, 0<=r<=0.1, x is 0.5-1, y is 0.1-0.5, z is greater than 0 and less than 0.4, w is greater than 0 and less than 0.4, delta is 0-0.05, and y+z+w<=1)

Description

technical field [0001] The invention relates to a composite metal oxide, a positive electrode active material, a positive electrode, a sodium secondary battery and a method for manufacturing the composite metal oxide. [0002] This application claims priority based on Japanese Patent Application No. 2017-065248 filed in Japan on March 29, 2017, the content of which is incorporated herein. Background technique [0003] In recent years, lithium secondary batteries have been put into practical use as secondary batteries, and their applications are expanding. However, lithium used in lithium secondary batteries is not abundant in terms of resources, and lithium resources may be exhausted in the future. [0004] On the other hand, sodium, which is also an alkali metal, is not only abundant in terms of resources, but also cheaper than lithium by an order of magnitude. In addition, since sodium has a high standard potential, it is considered that a sodium secondary battery can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/054
CPCH01M4/505H01M4/525H01M10/054Y02E60/10C01G53/50C01P2002/52C01P2002/72C01P2002/70C01P2002/54H01M2004/028C01G53/66C01P2002/90C01P2006/40
Inventor 外崎究
Owner SUMITOMO CHEM CO LTD
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