Metastable-state tin-based alloy material and preparation method thereof

A tin-based alloy and alloy technology, applied in the field of preparation and application research, can solve the problem of material morphology, limited ability to control the size and phase composition, cannot be used for the preparation and development of metastable phase alloy materials, and it is difficult to apply catalysis and energy storage and other issues, to achieve the effect of improving cycle stability, wide application range, and improving cycle performance

Active Publication Date: 2018-06-15
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The traditional preparation method of tin-based alloy is mainly high-temperature melting method. Although this method can prepare tin-based alloy on a large scale, its ability to control the shape, size and phase composition of the material is very limited, and it is difficult to apply it to catalysis and storage. Ability and other fields
Moreover, the alloy materials prepared by the traditional high-temperature melting method are all stable phase materials, which cannot be used for the preparation and development of new metastable phase alloy materials.

Method used

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  • Metastable-state tin-based alloy material and preparation method thereof
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  • Metastable-state tin-based alloy material and preparation method thereof

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preparation example Construction

[0045] The MSn 5 The preparation methods of new tin-based alloy phases include: high-temperature reduction method, hydrothermal synthesis method, wet chemical method, high-temperature smelting method, mechanochemical reaction method (such as mechanical ball milling method, mechanical alloying method, etc.), sol-gel method, magnetic controlled sputtering etc.

[0046] In the selection of raw materials, high temperature reduction method, hydrothermal synthesis method, wet chemical method, sol-gel method and other methods are used to optimize the corresponding metal salt materials; mechanochemical reaction method (such as mechanical ball milling method, mechanical alloying method, etc.), magnetron For methods such as sputtering, the corresponding metal elemental materials are preferable.

[0047] The present invention adopts wet chemical method to prepare and obtain product, makes metastable state MSn by introducing seed crystal 5 Alloys are easier to form, which solves the dif...

Embodiment 1

[0050] Preparation of elemental Sn negative electrode material:

[0051] 1. Add 3.6g of polyvinylpyrrolidone (PVP, MW=360,000) and 0.6g of poly(2-ethyl-2 oxazoline) (PEtOx, MW=50,000) into a 250ml three-necked flask, and add 40ml of four gamma Alcohol (TEG), the mixture was heated to 130 °C under an inert atmosphere of high-purity Ar and stirred until completely dissolved.

[0052] 2. Disperse 0.59g of stannous sulfate into 16ml of tetraethylene glycol at room temperature, then add SnSO 4 The TEG solution was added dropwise into a three-necked flask and stirred for 15 min. Disperse 1 g of sodium borohydride into 30 ml of tetraethylene glycol, then add fresh NaBH 4 The TEG solution was slowly added dropwise into a three-necked flask to obtain a black suspension.

[0053] 3. Stir for 1 h under an inert atmosphere, centrifuge, wash, and dry in a vacuum oven at 60° C. overnight to obtain the product.

[0054] The crystal structure and morphology of the elemental Sn material pr...

Embodiment 2

[0059] NiSn 5 Preparation of binary alloy new phase materials:

[0060] 1. Add 3.6g of polyvinylpyrrolidone (PVP, MW=360,000) and 0.6g of poly(2-ethyl-2 oxazoline) (PEtOx, MW=50,000) into a 250ml three-necked flask, and add 40ml of four gamma Alcohol (TEG), the mixture was heated to 130 °C under an inert atmosphere of high-purity Ar and stirred until completely dissolved.

[0061] 2. Disperse 0.59g of stannous sulfate into 16ml of tetraethylene glycol at room temperature, then add SnSO 4 The TEG solution was added dropwise into a three-necked flask and stirred for 15 min. Disperse 1 g of sodium borohydride into 30 ml of tetraethylene glycol, then add fresh NaBH 4 The TEG solution was slowly added dropwise into a three-necked flask to obtain a black suspension, and the temperature was raised to 205° C., and the stirring was continued for 15 minutes.

[0062] 3. Disperse 2mg of ferric chloride into 5ml of tetraethylene glycol, and then add FeCl 3 The TEG solution was added ...

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Abstract

The invention discloses a metastable-state tin-based alloy material and a preparation method thereof. The material mainly comprises two metal elements of Sn and Ni and also possibly comprises elementssuch as Fe, and Co, the metastable-state tin-based alloy material with a main phase being MSn5 is formed, and M is Ni, Fe<0.5>Ni<0.5> and Co<0.5>Ni<0.5>. By introducing a crystal seed during the synthesis process, a tin-based alloy new phase taking tin and nickel as main and difficult to synthesize by a traditional method is induced to be formed, and the method provides a new method and idea forsynthesis of other metastable-state materials particularly the metastable-state tin-based alloy material. The MSn5 alloy material can be used as a lithium / sodium ion battery active negative electrodematerial, Sn agglomeration can be suppressed due to the existence of non-active M metal, and the cycle stability of the material is improved.

Description

technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to research on the preparation and application of a novel metastable tin-based alloy material M-Sn (M=Ni, FeNi, or CoNi, etc.). Background technique [0002] Alloy materials are widely used in industrial production and daily life. The study of alloy phase diagrams has very positive significance for the understanding of the preparation conditions and physical and chemical properties of alloy materials, and then promotes the application and development of alloy materials. However, some metastable alloy phases do not exist in the traditional alloy phase diagram. The development of these alloy phases is of great significance to supplement the alloy phase diagram and improve the alloy theory. The conditions for the formation of metastable alloy phases are relatively harsh, so the development of metastable phase alloys requires selection or development of suitable preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/387H01M4/62H01M10/0525Y02E60/10
Inventor 韩伟强应杭君
Owner ZHEJIANG UNIV
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