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Sodium ion battery positive electrode Na2Fe2(SO4)3@alumina composite material and preparation method thereof

A technology of sodium ion battery and composite material, which is applied in the field of Na2Fe23@alumina composite material and its preparation field of the positive electrode of sodium ion battery, can solve the problems such as difficulty in realizing large-scale production, difficulty in realizing uniform coating of alumina, unstable material performance, etc. , to achieve the effect of inhibiting surface poisoning effect, good cycle stability and excellent rate performance

Active Publication Date: 2016-10-26
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Researchers have studied different systems of anode materials for sodium-ion batteries, among which P2-type and O3-type layered oxide systems are more representative, such as P2-Na 2 / 3 [Fe 1 / 2 mn 1 / 2 ]O 2 , O3-NaFe 0.5 co 0.5 o 2 , but these materials have short cycle life and low voltage plateau
Phosphate and pyrophosphate systems generally have disadvantages such as low voltage plateau
Na 2 Fe 2 (SO 4 ) 3 With a theoretical platform of 3.8V, it has a platform comparable to that of lithium-ion batteries. However, due to the hygroscopicity of the sulfate system, it is easy to cause poisoning on the surface of the material, which leads to problems such as harsh production environment requirements and unstable material performance during the material preparation process.
The traditional alumina coating achieves the purpose of alumina coating through the hydrolysis of aluminum salt in aqueous solution, but Na 2 Fe 2 (SO 4 ) 3 Easily soluble in water, it is difficult to achieve uniform coating of alumina by this method
Atomic layer deposition (ALD) is also difficult to meet Na 2 Fe 2 (SO 4 ) 3 The need for industrial production

Method used

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  • Sodium ion battery positive electrode Na2Fe2(SO4)3@alumina composite material and preparation method thereof
  • Sodium ion battery positive electrode Na2Fe2(SO4)3@alumina composite material and preparation method thereof
  • Sodium ion battery positive electrode Na2Fe2(SO4)3@alumina composite material and preparation method thereof

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Embodiment 1

[0074] This embodiment includes the following steps:

[0075] Step (1): This embodiment design generates 0.03mol target product Na 2 Fe 2 (SO 4 ) 3 @Alumina composite material, prepare 50mL of solution, weigh 0.03mol of sodium sulfate and 0.06mol of ferrous sulfate in 50mL of deionized water, stir to dissolve;

[0076] Step (2): Stir the solution treated in step (1) in an 80°C oil bath until the solution is evaporated to dryness, and the obtained solid powder is Na 2 Fe 2 (SO 4 ) 3 precursor products;

[0077] Step (3): The obtained precursor solid phase product is mixed with hydrogen and argon (5% H 2 +95% Ar) under the protection of the atmosphere, the temperature was raised to 350 ° C, sintered for 24 hours, the heating rate was 5 ° C / min, and the product Na 2 Fe 2 (SO 4 ) 3 ;

[0078] Step (3): the Na obtained in step (3) 2 Fe 2 (SO 4 ) 3 With 0.201g of aluminum isopropoxide, using acetone as the grinding medium, the ball-to-material ratio is 10:1, ball ...

Embodiment 2

[0084] This embodiment includes the following steps:

[0085] Step (1): This embodiment design generates 0.03mol target product Na 2 Fe 2 (SO 4 ) 3 @Alumina composite material, prepare 50mL of solution, weigh 0.03mol of sodium sulfate and 0.06mol of ferrous sulfate in 50mL of deionized water, stir to dissolve;

[0086] Step (2): Stir the solution treated in step (1) in an oil bath at 100°C until the solution is evaporated to dryness, and the obtained solid powder is Na 2 Fe 2 (SO 4 ) 3 precursor products;

[0087] Step (3): The obtained precursor solid phase product is mixed with hydrogen and argon (5% H 2 +95% Ar) under the protection of the atmosphere, the temperature was raised to 350 ° C, sintered for 24 hours, the heating rate was 5 ° C / min, and the product Na 2 Fe 2 (SO 4 ) 3 ;

[0088] Step (4): the Na obtained in step (3) 2 Fe2 ( SO 4 ) 3 With 0.201g of aluminum isopropoxide, using acetone as the grinding medium, the ball-to-material ratio is 10:1, b...

Embodiment 3

[0091] Step (1): This embodiment design generates 0.03mol target product Na 2 Fe 2 (SO 4 ) 3 @Alumina composite material, prepare 50mL of solution, weigh 0.03mol of sodium sulfate and 0.06mol of ferrous sulfate in 50mL of deionized water, stir to dissolve;

[0092] Step (2): Stir the solution treated in step (1) in an oil bath at 100°C until the solution is evaporated to dryness, and the obtained solid powder is Na 2 Fe 2 (SO 4 ) 3 precursor products;

[0093] Step (3): The obtained precursor solid phase product is mixed with hydrogen and argon (5% H 2 +95% Ar) under the protection of the atmosphere, the temperature was raised to 350 ° C, sintered for 24 hours, the heating rate was 5 ° C / min, and the product Na 2 Fe 2 (SO 4 ) 3 ;

[0094] Step (4): the Na obtained in step (3) 2 Fe 2 (SO 4 ) 3 With 0.268g of aluminum isopropoxide, using acetone as the grinding medium, the ball-to-material ratio is 10:1, ball milling for 6h, and drying the obtained powder in a ...

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Abstract

The invention discloses a Na2Fe2(SO4)3@alumina composite material having a core-shell structure and a preparation method and an application thereof. The material is a composite material having the core-shell structure and prepared by coating the surface of Na2Fe2(SO4)3 particles with alumina. The Na2Fe2(SO4)3 is pyrolytically coated with an organic aluminum salt, the problems that Na2Fe2(SO4)3 is dissolved in water and is difficultly coated by alumina via a traditional hydrolysis method are overcome, the synthesis method is simple, conditions are mild, and the yield is high; the prepared composite material can effectively suppress a 'surface poisoning effect' of the material, and has the advantages of high specific capacity, high work voltage, good cyclic stability and excellent rate performance when applied as a sodium ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries; be specifically related to a kind of sodium ion battery positive pole Na 2 Fe 2 (SO 4 ) 3 @alumina composite materials and methods for their preparation. Background technique [0002] As lithium-ion batteries have achieved rapid development in the field of 3C products and electric vehicles, and have shown good development prospects, due to the lack of metal lithium resources in the earth's crust, lithium-ion batteries are difficult to meet in the field of large-scale energy storage. For large-scale applications, its manufacturing cost will also show a rising trend with the shortage of lithium resources. Furthermore, due to the poor safety of lithium-ion batteries, their development in the field of electric vehicles and large-scale energy storage has been greatly restricted. However, compared with lithium, sodium is abundant in the earth's crust and has a wider source, and sodium and lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/139H01M10/36
CPCH01M4/139H01M4/366H01M4/48H01M4/5825H01M10/36Y02E60/10
Inventor 张治安陈晓彬宋俊肖李军明杨智伟李劼赖延清王飞任冠行宋润峰
Owner CENT SOUTH UNIV
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