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Iron-based layered oxide positive electrode active material and preparation method and application thereof

A cathode active material and oxide technology, applied in the field of iron-based oxide cathode active material and its preparation, can solve the problems of reducing the electrical conductivity of the material, the battery rate performance, the influence of low temperature performance, etc., so as to improve the cycle life and ensure stability. , the effect of widening sodium ion channels

Active Publication Date: 2021-11-30
YADEA TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, CN112456567A covers the active oxide in the process of synthesizing the sodium ion positive electrode material, and the coating layer is evenly distributed and closely combined on the surface of the positive electrode material, so as to improve the cycle stability of the positive electrode material of the sodium ion battery, but the coating will reduce the durability of the material. Electrical conductivity, which affects the rate performance and low temperature performance of the battery

Method used

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  • Iron-based layered oxide positive electrode active material and preparation method and application thereof
  • Iron-based layered oxide positive electrode active material and preparation method and application thereof

Examples

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Embodiment 1

[0070] This embodiment provides an iron-based layered oxide cathode active material, which is prepared by the following method:

[0071] 1) Powdered (battery grade) FeSO 4 、NiSO 4 , MnSO 4 with Al 2 (SO 4 ) 3 , MgSO 4 Weigh according to a certain weight ratio, where FeSO 4 The addition amount makes the content of Fe element in the precursor be 55wt% of the total mass of the cation in the precursor, NiSO 4 The addition amount makes the content of Ni element in the precursor be 25wt% of the total mass of the cation in the precursor, MnSO 4 The addition amount makes the content of the Mn element in the precursor be 20wt% of the total mass of the cation in the precursor, Al 2 (SO 4 ) 3 The amount of addition makes the content of Al element in the precursor be 1500ppm (the ppm content here is based on the total mass of cations in the hydroxide precursor), MgSO 4 The addition amount makes the content of the Mg element in the precursor be 500ppm (the ppm content here is ba...

Embodiment 2

[0080] The difference between this embodiment and embodiment 1 is only that Al in step 1) is changed 2 (SO 4 ) 3 and MgSO 4 Add-on and step 5) Al 2 o 3 and the addition of MgO make the concentration of doping element Mg in the internal layer of the positive electrode active material be 200ppm (based on the quality of the inner layer), and the concentration of the doping element Al in the inner layer be 500ppm (based on the quality of the inner layer); The concentration of the doping element Mg in the outer layer of the active material is 600ppm (based on the quality of the outer layer), and the concentration of the doping element Al in the outer layer is 1800ppm (based on the quality of the outer layer);

[0081] The total concentration of the doping element Mg in the positive electrode material is 500ppm (based on the mass of the positive electrode active material), and the total concentration of the doping element Al in the positive electrode material is 1200ppm (based o...

Embodiment 3

[0083] The difference between this embodiment and embodiment 1 is only that Al in step 1) is changed 2 (SO 4 ) 3 and MgSO 4 Add-on and step 5) Al 2 o 3 and the addition of MgO make the concentration of the doping element Mg in the inner layer of the positive electrode active material be 300ppm (based on the inner layer quality), and the concentration of the doping element Al in the inner layer be 1000ppm (based on the inner layer quality), and the positive electrode The concentration of the doping element Mg in the outer layer of the active material is 1300ppm (based on the quality of the outer layer), and the concentration of the doping element Al in the outer layer is 4250ppm (based on the quality of the outer layer);

[0084] The total concentration of the doping element Mg in the positive electrode material is 1000ppm (based on the mass of the positive electrode active material), and the total concentration of the doping element Al in the positive electrode material is...

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Abstract

The invention discloses an iron-based layered oxide positive active material as well as a preparation method and application thereof. The iron-based layered oxide positive electrode active material comprises an iron-based layered oxide NaFexM1yO2, the NaFexM1yO2 comprises a doping element M2 and a doping element Re, wherein x is greater than y, M1 is selected from at least one of Ni, Mn, Cu and Co, the doping element M2 is selected from at least one of Mg, Al, Ti and Zr, and the doping element Re is selected from at least one of rare earth elements. The Fe element is used as a reference element, and is matched with a proper amount of substitution element M1 and doping elements M2 and Re, so that the structural stability of the electrode material in the working process, especially in the working process under a high-temperature condition, can be effectively maintained, and the cycle life, particularly the high-temperature cycle life, of the material is greatly prolonged on the premise of not influencing the multiplying power .

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, and relates to an iron-based layered oxide cathode active material and a preparation method and application thereof. Background technique [0002] In today's society, there are more and more places where lithium-ion batteries are used as energy sources to reduce human dependence on fossil fuels. Especially in terms of electric two-wheelers, countries around the world are increasing investment in research and development and promoting the industry. With the widespread application of electric two-wheeled vehicles, lithium-ion batteries are used as the main energy supply system, and the consumption of lithium resources is also increasing. However, the content of lithium in the earth's crust is only 0.065‰. It is estimated that the lithium resources that can be mined on the earth can only meet the demand of 110TWh lithium batteries, which obviously cannot meet the growing power and ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/525H01M10/054
CPCC01G53/70H01M4/366H01M4/525H01M10/054H01M2004/028C01P2006/40Y02E60/10
Inventor 靳亚珲蔡铜祥韦士富厉远卿
Owner YADEA TECH GRP CO LTD
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