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Preparation method and application of a zinc germanate nanomaterial with controllable morphology

A nanomaterial, zinc germanate technology, applied in the field of preparation of zinc germanate nanomaterials, can solve the problems of reversible capacity fading, large volume change, poor cycle stability, cycle life and rate characteristics

Active Publication Date: 2021-04-16
北京绿能嘉业新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume of zinc germanate changes greatly during the charge and discharge process, which is easy to cause the pulverization of the material, and the loss of electrical contact with the current collector, so the reversible capacity of the material decays rapidly, showing poor cycle stability, cycle life and rate. characteristic

Method used

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  • Preparation method and application of a zinc germanate nanomaterial with controllable morphology
  • Preparation method and application of a zinc germanate nanomaterial with controllable morphology
  • Preparation method and application of a zinc germanate nanomaterial with controllable morphology

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 1)GeO 2 and Na 2 CO 3 Grind and mix evenly according to the molar ratio of 1:1, and then place it in a muffle furnace for calcination at 900°C for 10 hours; 2mmol Zn(Ac) 2 and 4mmol of acrylamide were dissolved in 50ml of deionized water, followed by adding 4mmol of ammonium fluoride and stirring to dissolve. Then add 1mmol Na2 GeO 3 , stirred for 10 min. Transfer the solution in the beaker to a 70ml Teflon-lined stainless steel reaction kettle. Put the reaction kettle into an oven, set the temperature at 140° C., and set the time for 12 hours.

[0041] 2) After the reaction is finished, cool down to room temperature naturally, suction filter and wash the liquid in the reaction kettle at a temperature of 25° C., collect the white precipitate by centrifugation, and wash 3 times with deionized water and absolute ethanol. Place the sample in a vacuum oven and dry overnight at 60°C to obtain white Zn 2 GeO 4 Nanomaterials A1.

[0042] The detection result of embodi...

Embodiment 2

[0047] 1)GeO 2 and Na 2 CO 3 Grind and mix evenly according to the molar ratio of 1:1, and then place it in a muffle furnace for calcination at 900°C for 10h. 2mmol Zn(Ac) 2 and 4mmol of acrylamide were dissolved in 50ml of deionized water, followed by adding 8mmol of ammonium fluoride and stirring to dissolve. Then add 1mmol Na 2 GeO 3 , stirred for 10 min. Transfer the solution in the beaker to a 70ml Teflon-lined stainless steel reaction kettle. Put the reaction kettle into an oven, set the temperature at 140° C., and set the time for 12 hours.

[0048] 2) After the reaction is finished, cool down to room temperature naturally, suction filter and wash the liquid in the reaction kettle at a temperature of 25° C., collect the white precipitate by centrifugation, and wash 3 times with deionized water and absolute ethanol. Place the sample in a vacuum oven and dry overnight at 60°C to obtain white Zn 2 GeO 4 Nanomaterials A2.

[0049] The detection result of embodime...

Embodiment 3

[0054] 1)GeO 2 and Na 2 CO 3 Grind and mix evenly according to the molar ratio of 1:1, and then place it in a muffle furnace for calcination at 900°C for 10h. 2mmol Zn(Ac) 2 and 4mmol of acrylamide were dissolved in 50ml of deionized water, followed by adding 16mmol of ammonium fluoride and stirring to dissolve. Then add 1mmol Na 2 GeO 3 , stirred for 10 min. Transfer the solution in the beaker to a 70ml Teflon-lined stainless steel reaction kettle. Put the reaction kettle into an oven, set the temperature at 140° C., and set the time for 12 hours.

[0055] 2) After the reaction is finished, cool down to room temperature naturally, suction filter and wash the liquid in the reaction kettle at a temperature of 25° C., collect the white precipitate by centrifugation, and wash 3 times with deionized water and absolute ethanol. Place the sample in a vacuum oven and dry overnight at 60°C to obtain white Zn 2 GeO 4 Nanomaterials A3.

[0056] The detection result of embodim...

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Abstract

The invention discloses a method for preparing zinc germanate nanomaterials with controllable morphology. The morphology is regulated by changing the amount of ammonium by using a hydrothermal method, and then the reaction system is subjected to suction filtration and dried to obtain Zn 2 GeO 4 nanomaterials. Zn prepared by the present invention 2 GeO 4 Nanomaterials have different dimensions. One-dimensional Zn 2 GeO 4 Nanowire length 6μm, diameter 200nm, two-dimensional Zn 2 GeO 4 Nanosheet thickness 40nm, diameter 100nm, three-dimensional Zn 2 GeO 4 The length of the nanorod is 1-3m, and the diameter is 200nm. After electrochemical tests, it is known that the three nanomaterials have good electrochemical properties and can be used as electrode materials for lithium batteries.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method and application of a zinc germanate nanomaterial with controllable morphology. Background technique [0002] The current commercial LIB anode material is graphite. Although its comprehensive performance is relatively excellent (especially good cycle stability), its low theoretical specific capacity (372mAh g-1) limits the further improvement of LIB energy density, so It is particularly important to develop a LIB anode material with higher theoretical specific capacity and energy density. [0003] Silicon (Si) and germanium (Ge) are currently known as the two LIB anode materials with the highest theoretical specific capacity, and their theoretical specific capacities are as high as 4200 (Li4.4Si) and 1600mAh g-1, respectively, which are several times that of graphite. many. Although the silicon negative electrode has a high theoretical specific capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G17/00B82Y40/00H01M4/48
CPCB82Y40/00C01G17/00C01P2002/72C01P2002/80C01P2004/03C01P2004/16C01P2004/64C01P2006/40H01M4/483Y02E60/10
Inventor 曾培源李建稳杨磊刘庆
Owner 北京绿能嘉业新能源有限公司