Ternary metal oxide positive material of sodium-ion battery and preparation method of ternary metal oxide positive material

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor cycle performance and low capacity at high rates, and achieve long cycle life, good rate performance, and high energy density.

Inactive Publication Date: 2015-05-27
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mainstream cathode materials for sodium-ion batteries have problems such as low high-rate capacity and poor cycle performance, which limit their practical applications.

Method used

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  • Ternary metal oxide positive material of sodium-ion battery and preparation method of ternary metal oxide positive material
  • Ternary metal oxide positive material of sodium-ion battery and preparation method of ternary metal oxide positive material
  • Ternary metal oxide positive material of sodium-ion battery and preparation method of ternary metal oxide positive material

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preparation example Construction

[0017] The preparation method of the sodium ion battery ternary metal oxide cathode material proposed by the present invention comprises the following steps:

[0018] (1) Preparation of sol: Dissolve citric acid and ethylene glycol in 100ml water respectively according to the molar ratio of 4:1 to obtain a mixed solution of citric acid and ethylene glycol. According to the stoichiometric ratio Na 0.7-x mn 1-y-z Ni y co z o 2 , wherein, 0+ , Mn 2+ 、Co 2+ and Ni 2+ A mixed solution with a total concentration of 0.2 to 1.0 mol / L is aged in a water bath at 60 to 80°C for 3 to 5 hours to obtain a sol;

[0019] (2) Preparation of gel: heating the above-mentioned sol to 120-150° C. to evaporate, and drying for 1-3 hours to obtain a porous xerogel, which is ground to obtain a powder;

[0020] (3) The above powder is heated to 500°C at a heating rate of 1°C-2°C / min, calcined for 3-5 hours, and then heated to 800-900°C at a heating rate of 3°C-5°C / min, After calcination for 10 t...

Embodiment 1

[0023] (1) Preparation of sol: respectively dissolve citric acid and ethylene glycol in 100ml water according to the molar ratio of 4:1, and then add molar ratio metal nitrate to dissolve to form a mixed solution of 0.5mol / L; Stir for 2 hours;

[0024] (2) Preparation of gel: Evaporate and dry the hydrosol aged in a 60°C water bath at 120°C to obtain a porous xerogel, which is ground and sintered.

[0025] (3) Heat the obtained and ground precursor powder to 500°C at a heating rate of 2°C / min, calcined for 3 hours, and then raise the temperature to 900°C at a heating rate of 5°C / min, and calcined for 12 hours , directly taken out from the furnace and rapidly cooled in an Ar gas environment, and finally the positive electrode P2 structure Na of the sodium ion battery is obtained. 0.67 mn 0.65 Ni 0.2 co 0.15 o 2 materials, and sealed and stored in an Ar gas environment to prevent moisture from entering.

[0026] Characterization of the obtained P2 structure material: after...

Embodiment 2

[0028] (1) Preparation of sol: respectively dissolve citric acid and ethylene glycol in 100ml water according to the molar ratio of 4:1, and then add molar ratio metal nitrate to dissolve to form a mixed solution of 0.5mol / L; Stir for 2 hours. .

[0029] (2) Preparation of the gel: Evaporate and dry the hydrosol aged in a water bath at 60°C at 120°C to obtain a porous xerogel, which is ground and sintered.

[0030] (3) Heat the obtained and ground precursor powder to 500°C at a heating rate of 2°C / min, calcined for 3 hours, and then raise the temperature to 900°C at a heating rate of 5°C / min, and calcined for 12 hours , directly taken out from the furnace and rapidly cooled in the Ar gas environment, and finally the P2 structure Na of the sodium ion battery was obtained. 0.67 mn 0.7 Ni 0.2 co 0.1 o 2 materials, and sealed and stored in an Ar gas environment to prevent moisture from entering.

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Abstract

The invention relates to a ternary metal oxide positive material of a sodium-ion battery and a preparation method of the ternary metal oxide positive material and belongs to the technical field of a sodium-ion battery. The structure formula of the positive material disclosed by the invention is Na<0.7-x>Mn<1-y-z>NiyCozO2 (x is larger than 0 and smaller than 0.1, y is larger than 0.15 and smaller than 0.25, z is larger than 0.05 and smaller than 0.2, and 1-y-z is larger than 0.5 and smaller than 0.7). According to the method disclosed by the invention, the pure-phase P2 structure positive material is prepared by a simple sol-gel method and high-temperature solid-phase sintering reaction. The method disclosed by the invention is simple in synthetic process, high in production efficiency and suitable for large-scale production; raw materials for reactants are all raw materials which are generally used in the preparation process of an existing lithium-ion battery metal oxide positive material. The P2 structure Na<0.7-x>Mn<1-y-z>NiyCozO2 material (x is larger than 0 and smaller than 0.1, y is larger than 0.15 and smaller than 0.25, z is larger than 0.05 and smaller than 0.2, and 1-y-z is larger than 0.5 and smaller than 0.7) prepared by the method disclosed by the invention has the characteristics of high energy density, good rate performance, long cycle life and the like.

Description

technical field [0001] The invention relates to a ternary metal oxide positive electrode material for a sodium ion battery and a preparation method thereof, in particular to the preparation of the metal oxide positive electrode material and its application as a positive electrode material for a sodium ion battery, belonging to the technical field of sodium ion batteries. Background technique [0002] Environmental pollution and the dwindling of non-renewable fossil resources have made the development of new energy sources a top priority in today's world. As a high-efficiency and portable energy storage and conversion system device, lithium-ion batteries have been widely used in the fields of notebook computers, electric vehicles, hybrid electric vehicles and plug-in electric vehicles, and have achieved huge economic benefits. However, the cost of existing lithium-ion batteries is high due to factors such as limited lithium resources; with the further widespread application o...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/1391H01M4/505H01M4/525Y02E60/10
Inventor刘向峰李正耀胡中波
OwnerUNIVERSITY OF CHINESE ACADEMY OF SCIENCES