Sodium-lithium-iron-manganese-based layered oxide material, and preparation method and application thereof

An oxide, layered technology for applications in materials

Pending Publication Date: 2021-07-06
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, sodium-ion batteries are still in the research stage at present, and there is no commercial sodium-ion battery cathode material. Now researchers focus on the layered

Method used

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  • Sodium-lithium-iron-manganese-based layered oxide material, and preparation method and application thereof
  • Sodium-lithium-iron-manganese-based layered oxide material, and preparation method and application thereof
  • Sodium-lithium-iron-manganese-based layered oxide material, and preparation method and application thereof

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Embodiment 1

[0062] The embodiment of the present invention provides a sodium-lithium-iron-manganese-based layered oxide material with oxygen ion valence, its preparation method and application. The layered oxide material is easy to prepare, and the contained elements sodium, lithium, iron and manganese are all non-toxic and safe elements, and are abundant in the earth's crust, so the manufacturing cost is low. The sodium-ion secondary battery using the sodium-lithium-iron-manganese-based layered oxide material of the present invention is simple to prepare, and it is found in the half-cell test that the material not only has high mass specific capacity and specific energy, but the specific capacity is ordinary It is 1.5 to 2 times that of the cathode material of sodium ion batteries, and has a good cycle life. It has great practical value and can be used for large-scale energy storage in solar power generation, wind power generation, smart grid peak regulation, distributed power stations, b...

Embodiment 2

[0076] This embodiment provides a preparation method of a sodium-lithium-iron-manganese-based layered oxide material, specifically a solid-phase method, such as Figure 4 shown, including:

[0077] Step 201, the stoichiometric 100wt%~108wt% sodium carbonate of the required sodium and the required stoichiometric lithium hydroxide and / or lithium carbonate, iron oxide and / or ferric oxide and manganese dioxide are mixed in proportion to form Precursor;

[0078] Step 202, using a ball milling method to uniformly mix the precursor to obtain a precursor powder;

[0079] Step 203, placing the precursor powder in a muffle furnace, and heat-treating it in an air atmosphere at 600° C. to 1000° C. for 2 to 24 hours;

[0080] Step 204, grinding the heat-treated precursor powder to obtain a sodium-lithium-iron-manganese-based layered oxide material.

[0081] The preparation method of the sodium-lithium-iron-manganese-based layered oxide material provided in this embodiment can be used to...

Embodiment 3

[0083] This embodiment provides a preparation method of a sodium-lithium-iron-manganese-based layered oxide material, specifically a spray drying method, such as Figure 5 shown, including:

[0084] Step 301, the stoichiometric 100wt%~108wt% sodium carbonate of the required sodium and the required stoichiometric lithium hydroxide and / or lithium carbonate, iron oxide and / or ferric oxide and manganese dioxide are mixed in proportion to form Precursor;

[0085] Step 302, adding ethanol or water to the precursor and stirring evenly to form a slurry;

[0086] Step 303, spray-drying the slurry to obtain a precursor powder;

[0087] Step 304, placing the precursor powder in a muffle furnace, and heat-treating in an air atmosphere at 600° C. to 1000° C. for 2 to 24 hours;

[0088] Step 305, grinding the heat-treated precursor powder to obtain a sodium-lithium-iron-manganese-based layered oxide material.

[0089] The preparation method of the sodium-lithium-iron-manganese-based lay...

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Abstract

The invention discloses a sodium-lithium-iron-manganese-based layered oxide material and a preparation method and application thereof. The chemical general formula of the material is Naa[LibFeCMnd]O2+[beta], and the space group of the layered oxide material has a corresponding structure of O3 phase. The oxygen ion variable valence layered oxide material is used for a positive electrode active material of a sodium ion secondary battery, during first-cycle charging, iron ions in crystal lattices lose electrons, the average valence state is increased from +3 valence to +4 valence, oxygen ions in the crystal lattices lose electrons, and the average valence state is increased from -2 to -1; during first-week discharge, oxygen ions with higher valence state obtain electrons again, then iron ions obtain electrons and are reduced, along with deep discharge, part of manganese ions obtain electrons, and the average valence state is changed from tetravalence to trivalence; and from the second week, iron ions, oxygen ions and manganese ions jointly participate in the reversible electron gaining and losing process in the charging and discharging process.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a sodium-lithium-iron-manganese-based layered oxide material with valence change of oxygen ions, a preparation method and an application. Background technique [0002] With the development and progress of society, human beings have an increasing demand for energy. However, due to the depletion of traditional fossil energy such as coal, oil, and natural gas, coupled with the increasingly severe problems of urban environmental pollution and greenhouse effect, Its application is gradually restricted in many ways, so the development of sustainable clean energy has always been the direction of attention of all countries. However, in the process of converting wind energy, solar energy, and tidal energy into electrical energy, these renewable energy sources are greatly restricted by natural conditions, and have the characteristics of obvious time discontinuity and spatial distribution...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/054H01M4/131
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/131H01M10/054Y02E60/10
Inventor 胡勇胜牛耀申容晓晖丁飞翔
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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