FeS-coated Fe3O4 nanometer composite material and application thereof

A nanocomposite material, fe3o4 technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor cycle performance and low capacity

Active Publication Date: 2017-11-03
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve Fe 3 o 4 Due to the low capacity and poor cycle performance of FeS as ano...

Method used

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  • FeS-coated Fe3O4 nanometer composite material and application thereof
  • FeS-coated Fe3O4 nanometer composite material and application thereof
  • FeS-coated Fe3O4 nanometer composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 FeS coated Fe 3 o 4 Preparation of nanocomposites

[0027] Will Fe 3 o 4 The powder and sulfur powder were mixed and ground in a mortar at a mass ratio of 1:0.5, and then the obtained powder was transferred to a corundum porcelain boat, spread evenly, covered with a lid, and then the corundum porcelain boat was placed in a tube furnace. According to the heating rate of 2 ℃ / min to 500 ℃, calcination at constant temperature for 4 hours, the obtained powder is FeS coated Fe 3 o 4 nanocomposites.

Embodiment 2

[0028] Example 2 FeS coated Fe 3 o 4 Preparation of nanocomposites

[0029] According to the mass ratio of 1:1 Fe 3 o 4Mix and grind the nano powder and sulfur powder in a mortar, then transfer the obtained powder to a corundum porcelain boat, spread it evenly, cover it, and then place the corundum porcelain boat in a tube furnace at 2°C / min The heating rate was increased to 500 °C, and the constant temperature was calcined for 4 hours, and the obtained powder was FeS-coated Fe 3 o 4 nanocomposites.

Embodiment 3

[0030] Example 3 FeS coated Fe 3 o 4 Preparation of nanocomposites

[0031] According to the mass ratio of 1:2 Fe 3 o 4 The powder and sulfur powder were mixed and ground in a mortar, then the obtained powder was transferred to a corundum porcelain boat, spread evenly, covered with a lid, and then the corundum porcelain boat was placed in a tube furnace at a rate of 2°C / min. The heating rate was increased to 500 ° C, and the constant temperature was calcined for 4 hours, and the obtained powder was FeS-coated Fe 3 o 4 nanocomposites.

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Abstract

The invention discloses a FeS-coated Fe3O4 nanometer composite material and application of the same in a sodium ion battery negative electrode material. The FeS-coated Fe3O4 nanometer composite material comprises an inner core and an outer shell, wherein the inner core is Fe3O4, and the outer shell is FeS. The FeS-coated Fe3O4 nanometer composite material provided by the invention comprises two preparation methods, the first preparation method comprises the step of preparing the nanometer composite material by surface vulcanization, and the second preparation method comprises the step of preparing the nanometer material by surface coating. The preparation methods are simple, are low cost in raw material and uniform in morphology, and can be used for preparation on a large scale; the nanometer composite material shows excellent sodium storage performance, particularly cycle stability when used as the sodium ion battery negative electrode material, which is benefited from a synergistic effect generated by the Fe3O4 in the composite material and the FeS outside the composite material; and the nanometer composite material combines the characteristics of excellent cycle property of the Fe3O4 and high capacity of the FeS, and is the sodium ion battery negative electrode material expected to be used.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and sodium ion secondary batteries, in particular to FeS coated Fe 3 o 4 Nanocomposites and their applications. Background technique [0002] Among many energy storage devices, lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage devices due to their high energy density, green efficiency, safety and stability, and no memory effect. However, with the increase in lithium demand, lithium resources are facing depletion. In contrast, sodium is extremely abundant in the earth's crust, and sodium-ion batteries have a similar energy storage mechanism to lithium-ion batteries, so they have received widespread attention. However, the radius of sodium ions is larger than that of lithium ions, so that the commercialized high-performance lithium battery negative electrodes cannot be directly used in sodium-ion batteries. At present, there i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M10/054
CPCH01M4/366H01M4/523H01M4/5815H01M10/054Y02E60/10
Inventor 吴兴隆侯宝华王莺莺吕红艳
Owner NORTHEAST NORMAL UNIVERSITY
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