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Preparation method and application of iron-based selenide used as sodium-ion battery negative electrode material

A technology for sodium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low capacitance and low conductivity, and achieve the effect of improving electrical conductivity, electrical conductivity, and electrochemical performance.

Active Publication Date: 2021-12-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for preparing an iron-based selenide as a sodium-ion battery negative electrode material for the existing sodium-ion battery single iron-based selenide negative electrode material in the charging and discharging process of low capacitance and low conductivity and application

Method used

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  • Preparation method and application of iron-based selenide used as sodium-ion battery negative electrode material
  • Preparation method and application of iron-based selenide used as sodium-ion battery negative electrode material
  • Preparation method and application of iron-based selenide used as sodium-ion battery negative electrode material

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Embodiment 1

[0033] The negative electrode material of the sodium ion battery is iron-based selenide Fe / FeSe 2 / Fe 3 Se 4 composite material.

[0034] The preparation method of the negative electrode material of the sodium ion battery comprises the following steps:

[0035](1) First assemble the synthesis system, including: a bubbler device heated by an oil bath, a partitioned tube furnace, and a circulating water cooling device, wherein the temperature of the oil bath is 40°C, and the partitioned tube furnace includes a heating zone tube furnace and Tube furnace in the reaction zone, the temperature is 450°C, and the heating rate is 20°C / min;

[0036] (2) Weigh 3g of Se powder, lay it flat on a porcelain boat, place it in the center of the tube furnace in the heating zone, wait until the temperature reaches the set temperature of Se powder at 450°C, and allow Se to fully volatilize for 5 minutes;

[0037] (3) Take 2.5mL of precursor Fe(CO) 5 Inject the bubbler device (Se powder is Fe...

Embodiment 2

[0048] (1) First assemble the synthesis system, including: a bubbler device heated by an oil bath, a partitioned tube furnace, and a circulating water cooling device, wherein the temperature of the oil bath is 40°C, and the partitioned tube furnace includes a heating zone tube furnace and Tube furnace in the reaction zone, the temperature is 450°C, and the heating rate is 20°C / min;

[0049] (2) Weigh 3g of Se powder, lay it flat on a porcelain boat, place it in the center of the tube furnace in the heating zone, wait until the temperature reaches the set temperature of Se powder at 450°C, and allow Se to fully volatilize for 5 minutes;

[0050] (3) Take 2.5mL of precursor Fe(CO) 5 Inject the bubbler device (Se powder is Fe(CO) 5 1.2 times the mass), 90% Ar and 10% H 2 The mixed inert gas is used as the carrier gas with a flow rate of 1500mL min -1 First pass through the side of the bubbler, then the gas passes through the heating zone tube furnace, carrying gaseous Fe(CO) ...

Embodiment example 3

[0056] (1) First assemble the synthesis system, including: a bubbler device heated by an oil bath, a partitioned tube furnace, and a circulating water cooling device, wherein the temperature of the oil bath is 40°C, and the partitioned tube furnace includes a heating zone tube furnace and Tube furnace in the reaction zone, the temperature is 450°C, and the heating rate is 20°C / min;

[0057] (2) Weigh 3g of Se powder, lay it flat on a porcelain boat, place it in the center of the tube furnace in the heating zone, wait until the temperature reaches the set temperature of Se powder at 450°C, and allow Se to fully volatilize for 5 minutes;

[0058] (3) Take 2.5mL of precursor Fe(CO) 5 Inject the bubbler device (Se powder is Fe(CO) 5 1.2 times the mass), 90% Ar and 10% H 2 The mixed inert gas is used as the carrier gas with a flow rate of 2000mL min -1 First pass through the side of the bubbler, then the gas passes through the heating zone tube furnace, carrying gaseous Fe(CO) ...

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Abstract

The invention relates to a preparation method and application of an iron-based selenide used as a sodium ion battery negative electrode material. According to the method, Se powder and Fe(CO)5 serve as raw materials, doping of C and the like is not needed, and the multi-component iron-based selenide with the heterostructure is prepared through a one-step method. The negative electrode material has a multi-component regulation and control function, Fe3Se4 is responsible for providing high specific capacity, FeSe2 has a narrow band gap (Eg = 1.0 eV), so that the conductivity of the sodium ion battery is improved, the capacity is also effectively improved, and meanwhile, metal Fe can be used as a miniature current collector to effectively accelerate the charge transfer behavior. The prepared selenide plays a role in improving the conductivity and the like, and the preparation method is simple and easy to operate.

Description

Technical field: [0001] The invention relates to the technical field of sodium ion batteries, in particular to a preparation method and application of an iron-based selenide used as a negative electrode material of a sodium ion battery. Background technique [0002] With the continuous development and progress of human society, the demand for energy is increasing. However, traditional energy sources such as coal, oil, and natural gas are gradually exhausted and cannot meet human needs for energy. At the same time, the burning of fossil fuels releases large amounts of CO 2 , CO, SO 2 and other harmful gases, causing great pollution to the environment. For this reason, people choose to develop new green and sustainable new energy sources, such as solar energy, wind energy, tidal energy, etc., but due to their high dependence on the natural environment, it is difficult to form a stable energy supply system, which promotes energy storage. Appearance of the device. Lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/58H01M4/136H01M4/1397
CPCH01M4/525H01M4/58H01M4/136H01M4/1397Y02E60/10
Inventor 冀璞光刘影郭志易殷福星王志伟韩双斌康少明冯建航闫钰夫王龚凯王宇
Owner HEBEI UNIV OF TECH