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a flower-like fes x Preparation method and application of /c nanocomposite material

A nano-composite, flower-like technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of electrode material falling off, active material structure collapse, loss of electrochemical activity, etc. The effect of low cost, little environmental pollution and easy preparation method

Active Publication Date: 2020-07-31
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where FeS and FeS 2 It is a stable, non-toxic and easy-to-prepare cheap material with high theoretical capacity (609mAh g -1 and 894mAh g -1 ), but FeS and FeS 2 Volume expansion occurs during charge and discharge (FeS and FeS 2 The volume expansions are 170% and 280%, respectively), so that the active material will cause the structure to collapse during the cycle, and eventually the material will gradually pulverize, resulting in the shedding of the electrode material and loss of electrochemical activity.
Therefore, increasing FeS and FeS 2 The cycle stability and high-rate performance of the anode material for sodium-ion batteries are the primary difficulties that need to be overcome at present, and there are few reports so far.

Method used

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  • a flower-like fes <sub>x</sub> Preparation method and application of /c nanocomposite material
  • a flower-like fes <sub>x</sub> Preparation method and application of /c nanocomposite material
  • a flower-like fes <sub>x</sub> Preparation method and application of /c nanocomposite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Select iron and sulfur according to the molar ratio of 1:2.5, and the dopamine content is 30%.

[0027] Dissolve 0.5012g of ferric chloride hexahydrate, 0.3521g of thiourea, 0.12g of dopamine and 0.06g of potassium persulfate in 20mL of hydrochloric acid solution with pH=4, and ultrasonicate for 30min at a power of 99W to obtain a clear and transparent mixed solution A;

[0028] 2) Pour the mixed solution A in step (1) into the reaction kettle, and react at 200°C for 60h;

[0029] 3) The obtained product was washed three times with deionized water and absolute ethanol respectively, and the synthetic material was dried in a blast drying oven at 80°C for 12 hours, and then dried in a tube furnace at 2°C·min -1 The heating rate reached 600°C and kept for 2h, and finally the product in the crucible was collected to obtain FeS x / C nanocomposite sodium ion battery anode material.

[0030] figure 1 Among (a) is the FeS prepared in the embodiment case 1 x / C nanocomposi...

Embodiment 2

[0036] 1) Select iron and sulfur according to the molar ratio of 1:2.5, and the dopamine content is 20% of the conditions,

[0037] Dissolve 0.5002g of ferric chloride hexahydrate, 0.3541g of thiourea and 0.06g of dopamine in 20mL of hydrochloric acid solution with pH=4.0, add 0.03g of potassium persulfate, ultrasonicate for 30min, and the ultrasonic power is 99W, to obtain a clear and transparent mixed solution A ;

[0038] 2) Pour the mixed solution A in step (1) into the reaction kettle, and react at 200°C for 60h;

[0039] 3) The obtained product was washed three times with deionized water and absolute ethanol respectively, and the synthetic material was dried in a blast drying oven at 80°C for 12 hours, and then dried in a tube furnace at 2°C·min -1 The heating rate reached 600°C and kept for 2h, and finally the product in the crucible was collected to obtain FeS x / C nanocomposite sodium ion battery anode material.

[0040] figure 1 Among (b) is the FeS prepared in the...

Embodiment 3

[0042] 1) Select iron and sulfur according to the molar ratio of 1:2.5, and the dopamine content is 30%. Take 0.5002g of ferric chloride hexahydrate, 0.3541g of thiourea and 0.12g of dopamine and dissolve them in 20mL of trishydroxymethylamino with pH=8.5 In methane solution, ultrasonic 30min, ultrasonic power 99W, to obtain a clear and transparent mixed solution A;

[0043] 2) Pour the mixed solution A in step (1) into the reaction kettle, and react at 200°C for 60h;

[0044] 3) The obtained product was washed three times with deionized water and absolute ethanol respectively, and the synthetic material was dried in a blast drying oven at 80°C for 12 hours, and then dried in a tube furnace at 2°C·min -1 The heating rate reaches 400°C and is maintained for 2h, and finally the product in the crucible is collected to obtain FeS x / C nanocomposite sodium ion battery anode material.

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Abstract

The invention belongs to the field of battery electrode materials and relates to a preparation method and application of a flower-shaped FeSx / C nano composite material. The invention adopts one-step hydrothermal method, realizes the synthesis of flower-shaped FeSx / C composite material by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature, and uses the flower-shaped FeSx / C composite material as a negative electrode material for sodium ion battery, wherein the flower-shaped FeSx / C composite material is synthesized by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature. The preparation method of the invention has the advantages that raw materials are easy to obtain, the synthesis method is simple and feasible, the carbon coating effect is good and the repeatability is strong, and the FeSx / C composite material prepared by the invention is used as the negative electrode material of the sodium ion battery, so that the specific capacity of the battery can be effectively improved, and the stability and the rate performance of the battery can be enhanced.

Description

technical field [0001] The invention belongs to the field of battery electrode materials and relates to a flower-shaped FeS x Preparation method and application of / C nanocomposite sodium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are widely used in energy storage components such as mobile phones, laptops, and electric vehicles due to their high energy density, but the limited storage and high price of lithium greatly restrict the large-scale development of lithium-ion batteries. At present, sodium-ion batteries have become the most likely energy storage method to replace lithium-ion batteries in the future due to their rich sodium resources, low cost, and environmental friendliness. [0003] In recent years, research on sodium-ion batteries has made some progress. So far, among many anode materials for sodium-ion batteries, tin, antimony, phosphorus, and metal sulfides have attracted extensive attention from scholars due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 邱静霞祁莹王广包健连加彪
Owner JIANGSU UNIV
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