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Carbon-coated ferrous sulfide negative electrode material, preparation method and sodium ion battery prepared therefrom

A technology for sodium ion batteries and negative electrode materials, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex synthesis steps, long time consumption, and many kinds of raw materials, and achieves simple preparation method, short time consumption, and low price. Effect

Active Publication Date: 2021-12-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many types of raw materials, and the synthesis steps are relatively complicated and time-consuming.

Method used

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  • Carbon-coated ferrous sulfide negative electrode material, preparation method and sodium ion battery prepared therefrom
  • Carbon-coated ferrous sulfide negative electrode material, preparation method and sodium ion battery prepared therefrom
  • Carbon-coated ferrous sulfide negative electrode material, preparation method and sodium ion battery prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the particle size of the carbon-coated ferrous sulfide material is 100-500 nm, and the mass of the coating layer is 10% of the mass of the material.

[0028] The synthetic steps of the carbon-coated ferrous sulfide material used in the present invention are as follows:

[0029] (1) Weigh 0.96 g of ferrous sulfate heptahydrate and 2.18 g of citric acid monohydrate, dissolve them in 7 mL of deionized water, stir and mix well, freeze-dried at -56°C for 24 hours to obtain the precursor;

[0030] (2) The precursor obtained in step (1) was ground and then placed in a tube furnace in an inert atmosphere for calcination at 800 °C for 6 h, and the carbon-coated ferrous sulfide substance was obtained by grinding.

[0031] figure 1 It is the X-ray diffraction (XRD) pattern of the carbon-coated ferrous sulfide material, which corresponds to the standard card of ferrous sulfide JCPDS 37~0477, and has good crystallinity. figure 2 The scanning electron microscop...

Embodiment 2

[0034] The preparation of the carbon-coated ferrous sulfide material in this example is the same as that in Example 1.

[0035] The prepared carbon-coated ferrous sulfide material was used as the negative electrode active material. The negative electrode material was mixed with conductive carbon (SuperP Li) and sodium carboxymethyl cellulose in a mass ratio of 80:10:10, and deionized water was used as a dispersant. , mix the above mixture evenly and adjust it into slurry and apply it to the copper foil. After drying at 60 ℃, cut out the negative pole piece. The metal sodium piece is the counter electrode (the capacity of the counter electrode is much larger than that of the cut negative piece). The sheet was separated from the metallic sodium sheet by Whatman glass fiber membrane, using 1 M NaCF 3 SO 3 Dissolved in diethylene glycol dimethyl ether as electrolyte, stainless steel shell as outer shell, assembled into CR2025 type button battery, the battery assembled in the abov...

Embodiment 3

[0037] The preparation of the carbon-coated ferrous sulfide material in this example is the same as that in Example 1.

[0038] The prepared carbon-coated ferrous sulfide material was used as the negative electrode active material. The negative electrode material was mixed with conductive carbon (SuperP Li) and sodium carboxymethyl cellulose in a mass ratio of 80:10:10, and deionized water was used as a dispersant. , mix the above mixture evenly to make a slurry and apply it to the copper foil, Na 3 V 2 (PO 4 ) 3 As the positive active material, the positive active material is mixed with acetylene black and polyvinylidene fluoride in a mass ratio of 80:10:10, and 1~methyl~2~pyrrolidone is used as a dispersant. On the aluminum foil, drying and cutting at 60 ℃ to obtain the corresponding negative electrode and positive electrode (the capacity of the positive electrode is much larger than the capacity of the cut negative electrode), and the negative electrode and the positive ...

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Abstract

The invention relates to a carbon-coated ferrous sulfide negative electrode material, a preparation method and a sodium ion battery prepared therefrom. The carbon-coated ferrous sulfide negative electrode material refers to carbon-coated ferrous sulfide and its doped modification materials. Among them, the particle size of ferrous sulfide is 100-500 nm, the mass of the carbon coating layer is 3%-30% of the mass of the electrode material, and the doping modification elements are M=Co, Ni, Mn, Ti, Cu, Mg, Ba One or more of , Pb, Al, etc., the mass of doping modification elements is 0-30% of the mass of the negative electrode material. The preparation method is as follows: adding metal sulfate and carbon source to deionized water, stirring, dissolving and mixing at room temperature, freeze-drying to obtain a precursor, and calcining at high temperature under an inert atmosphere to obtain a carbon-coated ferrous sulfide negative electrode material. As a negative electrode material for a sodium ion battery, the invention has the advantages of abundant raw materials, simple preparation, short preparation cycle, low cost, no pollution, good rate performance and strong cycle stability, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a carbon-coated ferrous sulfide negative electrode material, a preparation method and a sodium ion battery prepared therefrom. Background technique [0002] As a chemical energy source, lithium-ion batteries have the advantages of small size, high voltage and high energy density. Lithium-ion batteries have been widely used in human life, from small devices such as mobile phones and computers to high-power applications such as electric vehicles and smart grids. However, the characteristics of uneven distribution of lithium resources and high cost limit the large-scale application of lithium-ion batteries. Na-ion batteries have similar working principles to lithium-ion batteries, and at the same time have unique advantages in the fields of next-generation transportation and power grids due to their low price and abundant reserves. [0003] Transition metal sulfides have attrac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 陈卫华关新新杨丹米立伟张建民张继雨
Owner ZHENGZHOU UNIV
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