Preparation method and application of hydrated basic zinc pyrovanadate (Zn3V2O7(OH)2.2H2O) material

A 2·2H2O, zinc pyrovanadate technology, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problem of low electronic conductivity and ionic conductivity, not suitable for high-power power batteries, and large particles of negative electrode materials. and other problems, to achieve uniform size distribution, good rate cycle performance, and good crystallinity.

Active Publication Date: 2018-06-29
HUBEI UNIV
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Problems solved by technology

The patent application with the application number CN 103236531A discloses a lithium-ion battery zinc vanadate negative electrode material and its preparation method. It uses zinc pyrovanadate as a precursor to prepare a new type of lithium-ion battery negative electrode material zinc vanadate Zn 3 (VO 4 ) 2 , the preparation of this material requires high temperature treatment, complex procedures, high energy consumption, and the prepared negative electrode material has large particles, low electronic conductivity and ion conductivity, poor rate performance, and is not suitable for high-power power battery applications.

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  • Preparation method and application of hydrated basic zinc pyrovanadate (Zn3V2O7(OH)2.2H2O) material
  • Preparation method and application of hydrated basic zinc pyrovanadate (Zn3V2O7(OH)2.2H2O) material
  • Preparation method and application of hydrated basic zinc pyrovanadate (Zn3V2O7(OH)2.2H2O) material

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Embodiment 1

[0038] A kind of hydration basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) the preparation method of material is to make as follows:

[0039] 1mmol vanadyl acetate VO(Ac) 2 Dissolve 1.5mmol of zinc chloride in 100ml of dimethylformamide solvent in turn, stir well to obtain a dark green solution, then transfer the resulting dark green solution to a stainless steel reaction kettle, put the reaction kettle into an oven and heat to 120°C After constant temperature reaction for 3h, finally cooled to room temperature, the obtained product was alternately washed with distilled water and absolute ethanol for 3 times, centrifugally filtered, and vacuum-dried to obtain the product hydrated basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) Materials.

[0040] The product hydration basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) The X-ray diffraction results of the material are as figure 1 Shown in (a), product SEM results are as follows figure 2 In (a) show...

Embodiment 2

[0044] A kind of hydration basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) the preparation method of material is to make as follows:

[0045] 1mmol vanadyl acetate VO(Ac) 2 and 2mmol of zinc chloride were dissolved in 100ml of dimethylformamide solvent in sequence, and a dark green solution was obtained after stirring evenly, and then the obtained dark green solution was transferred to a stainless steel reaction kettle, and the reaction kettle was heated to 180°C in an oven React at a constant temperature for 6 hours, and finally cool to room temperature. The resulting product was washed alternately with distilled water and absolute ethanol for 3 times, then centrifugally filtered, and vacuum-dried to obtain the product hydrated basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) Materials.

[0046] The product hydration basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) The X-ray diffraction results of the material are as figure 1 Shown in (b), the pro...

Embodiment 3

[0050] A kind of hydration basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) the preparation method of material is to make as follows:

[0051] 1mmol vanadyl acetate VO(Ac) 2 Dissolve 2.5mmol zinc chloride and 2.5mmol zinc chloride in 100ml of dimethylformamide solvent in turn, stir well to obtain a dark green solution, then transfer the obtained dark green solution to a stainless steel reaction kettle, put the reaction kettle into an oven and heat to 180°C After the reaction at constant temperature for 12 hours, finally cooled to room temperature, the resulting product was alternately washed with distilled water and absolute ethanol for 3 times, centrifugally filtered, and vacuum-dried to obtain the product hydrated basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) Materials.

[0052] The product hydration basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) The X-ray diffraction results of the material are as figure 1 Shown in (c), the product scanning ...

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Abstract

The invention relates to a preparation method and an application of a hydrated basic zinc pyrovanadate (Zn3V2O7(OH)2.2H2O) material. VO(Ac)2 and ZnCl2 are dissolved in a dimethylformamide solvent sequentially in a mole ratio being 1:1.5-1:4, the materials are stirred uniformly, and a dark green solution is obtained; the dark green solution is transferred to a stainless steel reactor, and the reactor is placed into an oven, heated to 120-180 DEG C and subjected to a thermostatic reaction for 3-36 h; cooling is performed to room temperature finally, a product is washed with distilled water and absolute ethyl alcohol, centrifugal filtering and vacuum drying are performed, and the product hydrated basic zinc pyrovanadate (Zn3V2O7(OH)2.2H2O) is obtained. Hydrated basic zinc pyrovanadate prepared with the method has higher reversible specific capacity, excellent electrochemical cycle performance and good rate capability and can serve as a novel anode material to be applied to a lithium ion battery system.

Description

technical field [0001] The invention belongs to the technical field of synthesis of micro-nano materials, more specifically, the invention relates to a hydrated basic zinc pyrovanadate (Zn 3 V 2 o 7 (OH) 2 2H 2 O) Preparation method and application of materials. Background technique [0002] Lithium Ion Battery (Lithium Ion Battery) is a secondary battery (rechargeable battery), which mainly relies on lithium ions to move between the positive electrode and the negative electrode to work. It has the advantages of light weight, large capacity, and no memory effect. general application. Lithium-ion batteries have been commercially available for decades and are used in a wide variety of electronic devices. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, diaphragms, and battery casings. Among them, the physical and chemical activities of positive and negative electrode materials are the key to the perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00H01M4/58H01M10/0525
CPCC01G31/00C01P2002/72C01P2004/03C01P2004/04H01M4/5825H01M10/0525H01M2004/027Y02E60/10
Inventor 冯传启陈骁刘晓琳吴慧敏
Owner HUBEI UNIV
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