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Iron-nickel bimetal selenide nanomaterial and preparation method thereof, and lithium ion battery

A technology for lithium-ion batteries and nanomaterials, which is applied in its preparation method and the field of lithium-ion batteries and iron-nickel bimetallic selenide nanomaterials, can solve problems such as complex processes, poor product purity and crystallinity, and achieve simplified operations and improved crystallization The Effects of Sex and Purity

Active Publication Date: 2020-11-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Iron-nickel bimetal selenide nanomaterial and preparation method thereof, and lithium ion battery
  • Iron-nickel bimetal selenide nanomaterial and preparation method thereof, and lithium ion battery
  • Iron-nickel bimetal selenide nanomaterial and preparation method thereof, 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 300rpm), the device was heated to 135°C at a constant speed (rate 8°C / min) and kept for 35min. 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 product obtained...

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 bimetal selenide nanomaterial and 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 the step of carrying out a heating reaction on ferric acetylacetonate, nickel acetylacetonate and dibenzyl diselenide in a solvent to form the Fe2NiSe4 nanomaterial. According to the method, specific precursor sources, namely ferric acetylacetonate, nickel acetylacetonate and dibenzyl diselenide, are adopted and subjectecd to a reaction in a solvent system, so the Fe2NiSe4 nanomaterial can be directly synthesized in one step; and thus, operation is greatly simplified, and the crystallinity and purity of the Fe2NiSe4 nanomaterial can be effectively improved. When the Fe2NiSe4 nanomaterial prepared by the method is used as a negative electrode material of the lithium ion battery, the specific lithium storage capacity, the rate capability and the cycle performance of the battery can be improved.

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 Applications(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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