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Iron nickel sulphide and preparation method thereof, and sodium-ion battery by taking iron nickel sulphide as anode

A technology of sulfide and iron-nickel, which is applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of low utilization rate of active points for effective charge and discharge, large microscopic size of electrode materials, and low conductivity of iron sulfide. The effect of low price, simple and stable preparation method, and excellent rate performance

Active Publication Date: 2019-06-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low conductivity of iron sulfide, poor interfacial compatibility with organic electrolytes, large microscopic size of electrode materials, and low utilization of active sites for effective charging and discharging have greatly hindered its ability to store sodium electrochemically.
At the same time, due to the high resistivity of iron sulfide, the voltage drops rapidly during discharge, especially when the battery is discharged with a high current, it will cause serious polarization, which greatly shortens the working life of the battery.

Method used

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  • Iron nickel sulphide and preparation method thereof, and sodium-ion battery by taking iron nickel sulphide as anode
  • Iron nickel sulphide and preparation method thereof, and sodium-ion battery by taking iron nickel sulphide as anode
  • Iron nickel sulphide and preparation method thereof, and sodium-ion battery by taking iron nickel sulphide as anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The process of preparing iron-nickel sulfide is as follows according to the reactant mass ratio of 1:1:2:

[0032] 1) Take 2 g of analytically pure ferric citrate, 2 g of nickel nitrate, and 4 g of urea, mix and grind in a glass mortar to obtain mixture A;

[0033] 2) Heat mixture A in a low-temperature tube furnace at 2°C / min to 800°C for 3 hours, take it out after cooling, and obtain product B;

[0034] 3) Mix and grind the product B and its 5 times the mass of sublimed sulfur in a glass mortar to obtain a mixture C;

[0035] 4) The mixture C was then calcined in a low-temperature tube furnace at a rate of 5 °C / min to 400 °C for 1 h, and then taken out after cooling to obtain product D, which is an iron-nickel bimetallic sulfide nanomaterial.

[0036] Adopt Japanese science D / max2000PCX-ray diffractometer to analyze product, the XRD of embodiment 1 gained product is as follows figure 1 shown, from figure 1 It can be seen from the figure that the product is an iron-...

Embodiment 2

[0038] The process of preparing iron-nickel sulfide is as follows according to the reactant mass ratio of 1:1:3:

[0039] 1) Take 2g of analytically pure ferric oxalate, 2g of nickel nitrate, and 6g of melamine, and mix and grind them in a glass mortar to obtain a mixture, which is denoted as A;

[0040] 2) Heat mixture A in a low-temperature tube furnace at 8°C / min to 500°C for 1 hour, take it out after cooling, and obtain product B;

[0041] 3) Mix and grind product B and its 4 times the mass of thioacetamide in a glass mortar to obtain mixture C;

[0042] 4) The mixture C is then heated to 300°C for 0.5h in a low-temperature tube furnace at a rate of 6°C / min and calcined for 0.5h, and then taken out after cooling to obtain the product D, which is an iron-nickel bimetallic sulfide;

[0043] figure 2 It is a high-magnification scanning electron microscope photo of the iron-nickel sulfide composite. The S-4800 scanning electron microscope (SEM) of Japan Electronics Co., Ltd...

Embodiment 3

[0045] The process of preparing iron-nickel sulfide is as follows according to the reactant mass ratio of 1:1:1:

[0046] 1) Take 2g of analytically pure iron acetate, 2g of nickel nitrate, and 2g of carbodiimide, and mix and grind them in a glass mortar to obtain a mixture, which is denoted as A;

[0047] 2) Heat mixture A in a low-temperature tube furnace at 12°C / min to 900°C for 4 hours, take it out after cooling, and obtain product B;

[0048] 3) Mix and grind the product B and 3 times the mass of thiocyanuric acid in a glass mortar to obtain a mixture C;

[0049] 4) Calcining the mixture C in a low-temperature tube furnace at 8°C / min to 500°C for 0.5h, and taking it out after cooling to obtain the product D, which is an iron-nickel bimetallic sulfide;

[0050] The sample was tested for electrochemical performance, and its rate performance is as follows: Figure 5 shown by Figure 5 It can be seen that the sample can still maintain a sodium storage capacity close to 200mA...

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Abstract

The present invention discloses a preparation method of an iron nickel sulphide. The method comprises the steps of: of obtaining an iron organic acid salt, nickel nitrate and a carbon and nitrogen source organic matter according to a mass ratio of 1:(1-3):(1-7) for mixing and grinding to obtain a mixture A; performing heat treatment of the mixture A for 1-5h at a temperature of 500-1200 DEG C, taking out the mixture A after cooling to obtain a product B, uniformly mixing and grinding of the product B and a sulfur source according to a mass ratio of 1(5-10) to obtain a mixture C; performing heat treatment of the mixture C for 30min-1h at a temperature of 300-600 DEG C, taking out the mixture C after cooling to obtain a product D which is the iron nickel sulphide. The prepared iron nickel sulphide has a cucurbit-shaped structure with active particles continuously coated with carbon layers; the active particles in the structure can maintain the nanoscales in the charge-discharge process,the carbon-coated nano tube structure can protect the material expansion process to maintain the stability of the structure of the active materials, the graphited carbon nano tube can provided a high-speed conductive path, and the iron nickel sulphide can be used for the anode of the sodium-ion battery.

Description

technical field [0001] The invention belongs to the field of composite material synthesis, and in particular relates to an iron-nickel sulfide and a preparation method thereof, and also relates to a sodium-ion battery using the iron-nickel sulfide as the negative electrode material of the battery. Background technique [0002] In recent years, due to the wide distribution and abundant reserves of sodium in the earth, the research and development of room temperature sodium-ion charge-discharge batteries has been considered to replace lithium-ion batteries in large-scale energy storage, especially in the fields of smart grids, to effectively solve the problem of lithium-ion batteries. An effective approach to the problem of low battery mineral reserves and high cost of lithium sources. Among the many anode material systems for sodium-ion batteries, carbon, metal oxides or sulfides, and alloy materials such as Sn and Sb are the most concerned types of material systems by schola...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/525H01M4/36H01M4/583H01M4/62H01M10/054
CPCY02E60/10
Inventor 李嘉胤王蓉石梁孟云王润宁冯亮亮许占位席乔
Owner SHAANXI UNIV OF SCI & TECH
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