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

A technology of lithium-ion batteries and nanomaterials, applied in iron-cobalt double metal selenide nanomaterials, its preparation method and the field of lithium-ion batteries, can solve the problems of complicated process, poor product purity and crystallinity, and achieve simplified operation 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, most of the preparation methods disclosed in the current research are relatively complex multi-step reaction methods. For example, for iron nickel selenide, the bimetallic intermediate is first obtained by calcination or water / solvothermal method, and then the target compound is obtained by selenization. The product, the process is complicated, and the purity and crystallinity of the obtained product are poor

Method used

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

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preparation example Construction

[0030] The invention provides an iron-cobalt double metal selenide Fe 2 CoSe 4 Preparation methods of nanomaterials, including:

[0031] Iron acetylacetonate, cobalt acetylacetonate and dibenzyldiselenide are heated in a solvent to form Fe 2 CoSe 4 nanomaterials.

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

Embodiment 1

[0049] 1.1 Preparation

[0050] Take 0.1mmol (35.3mg) iron acetylacetonate, 0.05mmol (12.8mg) cobalt 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 350rpm), the device was heated to 135°C at a constant speed (rate 10°C / min) and kept for 20min. Then continue to heat up to 280°C at 10°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 CoSe 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 obtain...

Embodiment 2

[0071] 1.1 Preparation

[0072] Take 0.1mmol (35.3mg) iron acetylacetonate, 0.05mmol (12.8mg) cobalt 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 450rpm), the device was heated to 120°C at a constant speed (rate 5°C / min) and kept for 25min. Then continue to heat up to 270°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 CoSe 4 nanomaterials.

[0073] 1.2 Characterization and testing

[0074] 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 shape and a...

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Abstract

The invention provides an iron-cobalt bimetal selenide nanomaterial and a preparation method thereof, and a lithium ion battery. The preparation method of the iron-cobalt double-metal selenide nanomaterial comprises the following step: carrying out a heating reaction on ferric acetylacetonate, cobalt acetylacetonate and dibenzyl diselenide in a solvent to form the Fe2CoSe4 nanomaterial. Accordingto the method, specific ferric acetylacetonate, nickel acetylacetonate and dibenzyl diselenide are used as precursor sources and undergo a reaction in a solvent system, so the Fe2CoSe4 nanomaterial can be directly synthesized in one step; and thus, operation is greatly simplified, and the crystallinity and purity of the Fe2CoSe4 nanomaterial can be effectively improved. When the Fe2CoSe4 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 canbe improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to an iron-cobalt double-metal selenide nanomaterial, a preparation method thereof and a lithium-ion battery. Background technique [0002] Rechargeable lithium-ion batteries (LIBs) have dominated the consumer market for smart electronic devices since their commercialization by Sony in 1990, and have even been successfully used in electric vehicles (EV) and hybrid electric vehicles (HEV) in recent years. superior. Generally, lithium-ion batteries are composed of negative electrode materials (such as graphite), positive electrode materials (such as LiCoO 2 ), electrolyte and diaphragm. Commercial lithium-ion batteries are charged and discharged according to the "rocking chair" mechanism. Thanks to the continuous migration of lithium ions inside the battery, electrons can form a continuous current supply to electrical equipment through an external circuit. Obv...

Claims

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Application Information

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