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A kind of iron-nickel double metal selenide nanomaterial, its preparation method and lithium ion battery

A technology for lithium-ion batteries and nanomaterials, applied in its preparation method and the field of lithium-ion batteries, iron-nickel bimetallic selenide nanomaterials, can solve the problems of poor product purity and crystallinity, and complicated processes

Active Publication Date: 2022-04-19
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Moreover, the preparation methods disclosed in the current research are mostly complex multi-step reaction methods. For example, for iron nickel selenide, the Fe-Ni intermediate is first obtained by calcination or water / solvothermal method, and then obtained by selenization. The target product, the process is complicated, and the purity and crystallinity of the obtained product are poor

Method used

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  • A kind of iron-nickel double metal selenide nanomaterial, its preparation method and lithium ion battery
  • A kind of iron-nickel double metal selenide nanomaterial, its preparation method and lithium ion battery
  • A kind of iron-nickel double metal selenide nanomaterial, its preparation method and lithium ion battery

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preparation example Construction

[0030] The invention provides a kind of iron-nickel double metal selenide Fe 2 NiSe 4 Preparation methods of nanomaterials, including:

[0031] Iron acetylacetonate, nickel acetylacetonate and dibenzyl diselenide are heated in a solvent to form Fe 2 NiSe 4 nanomaterials.

[0032] The present invention adopts specific precursor source---iron acetylacetonate [Fe(acac) 3 ], nickel acetylacetonate [Ni(acac) 2 ] and dibenzyldiselenide [(PhCH 2 ) 2 Se 2 ], react in a solvent system, can directly synthesize Fe in one step 2 NiSe 4 nanomaterials, and can effectively improve the Fe 2 NiSe 4 Nanomaterial crystallinity and purity. According to the research of the applicant, when other conventional sources of iron, nickel or selenium are used, Fe cannot be synthesized by the one-step reaction rule of the present application. 2 NiSe 4 nanomaterials. In the present invention, there is no special limitation on the sources of the iron acetylacetonate, nickel acetylacetonate and...

Embodiment 1

[0049] 1.1 Preparation

[0050] Take 0.1mmol (35.3mg) iron acetylacetonate, 0.05mmol (12.8mg) nickel acetylacetonate, 0.1mmol (34.0mg) dibenzyldiselenide and 5.0mL oleylamine solvent into a 100mL three-necked flask, and set up a reflux device. Under the conditions of argon atmosphere (atmospheric pressure in the flask) and magnetic stirring (rate 300 rpm), the device was heated to 135° C. at a constant speed (rate 8° C. / min) and maintained for 35 minutes. Then continue to heat up to 280°C at 8°C / min and keep warm for 40min. Then naturally cool to room temperature, wash the precipitate in the there-necked flask several times with n-hexane and ethanol solution, then centrifuge and vacuum dry to obtain Fe 2 NiSe 4 nanomaterials.

[0051] 1.2 Characterization and testing

[0052] (1) The resulting product is tested by transmission electron microscope, and the results are as follows: figure 1 as shown, figure 1 It is a transmission electron microscope (TEM) test chart of the ...

Embodiment 2

[0070] 1.1 Preparation

[0071] Take 0.1mmol (35.3mg) iron acetylacetonate, 0.05mmol (12.8mg) nickel acetylacetonate, 0.1mmol (34.0mg) dibenzyldiselenide and 10.0mL oleylamine solvent into a 100mL three-necked flask, and set up a reflux device. Under the conditions of argon atmosphere (atmospheric pressure in the flask) and magnetic stirring (speed 200 rpm), the device was heated to 120° C. at a constant speed (rate 5° C. / min) and kept for 60 minutes. Then continue to heat up to 260°C at 5°C / min and keep warm for 60min. Then naturally cool to room temperature, wash the precipitate in the there-necked flask several times with n-hexane and ethanol solution, then centrifuge and vacuum dry to obtain Fe 2 NiSe 4 nanomaterials.

[0072] 1.2 Characterization and testing

[0073] Various characterizations were carried out according to the characterization test method in Example 1, and the results showed that the obtained product was a nanosheet material with a relatively uniform s...

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Abstract

The invention provides an iron-nickel double metal selenide nanometer material, a preparation method thereof and a lithium ion battery. The preparation method of the iron-nickel double metal selenide nanomaterial provided by the invention comprises: heating and reacting iron acetylacetonate, nickel acetylacetonate and dibenzyl diselenide in a solvent to form Fe 2 NiSe 4 nanomaterials. The present invention adopts specific precursor sources-iron acetylacetonate, nickel acetylacetonate and dibenzyl diselenide to react in a solvent system to directly synthesize Fe in one step. 2 NiSe 4 nanomaterials, which greatly simplifies the operation and can effectively improve the Fe 2 NiSe 4 Crystallinity and purity of nanomaterials. Fe obtained by the present invention 2 NiSe 4 Nanomaterials are used as anode materials for lithium-ion batteries, which can improve the lithium storage specific capacity, rate performance and cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to an iron-nickel double-metal selenide nanomaterial, a preparation method thereof and a lithium-ion battery. Background technique [0002] With the further improvement of people's requirements for the use time of mobile devices and the cruising range of electric vehicles, the energy density of current lithium-ion batteries has gradually been unable to meet the development of society. Therefore, the development of electrode materials with high lithium storage properties and excellent cycle stability will be a key step to improve the performance of lithium-ion batteries. [0003] For negative electrode materials, the specific capacity of graphite is currently developed up to ~360mAh g -1 , which is very close to its theoretical value (~372mAh g -1 ), based on this, it is imminent to find anode alternative materials with higher energy density. In general, lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/00H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCC01B19/007H01M4/581H01M10/0525B82Y30/00B82Y40/00C01P2006/40C01P2004/04C01P2002/72C01P2002/85C01P2002/80C01P2002/84C01P2004/20Y02E60/10
Inventor 杨晴杨静
Owner UNIV OF SCI & TECH OF CHINA
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