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

A technology for sodium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex synthesis steps, many types of raw materials, and long time consumption, and achieve simple and easy-to-operate preparation methods and strong cycle stability , time-consuming effect

Active Publication Date: 2019-01-08
ZHENGZHOU UNIV
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  • 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 by the same
  • Carbon-coated ferrous sulfide negative electrode material, preparation method and sodium ion battery prepared by the same
  • Carbon-coated ferrous sulfide negative electrode material, preparation method and sodium ion battery prepared by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0030] (2) Grind the precursor obtained in step (1) and place it in a tube furnace with an inert atmosphere for calcination at 800 °C for 6 hours, and grind to obtain carbon-coated ferrous sulfide.

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

Embodiment 2

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

[0035] The prepared carbon-coated ferrous sulfide was used as the negative electrode active material, and the negative electrode material was mixed with conductive carbon (SuperP Li) and sodium carboxymethyl cellulose at a mass ratio of 80:10:10, and deionized water was used as the dispersant , mix the above mixture evenly, adjust it into a slurry and apply it on the copper foil, dry it at 60°C and cut it to get the negative electrode sheet. The sheet is separated from the metal sodium sheet by Whatman glass fiber membrane, using 1 M NaCF 3 SO 3 Dissolved in diethylene glycol dimethyl ether as the electrolyte, and the stainless steel shell as the shell, assembled into a CR2025 button battery. The battery assembled in the above process was charged and discharged in the potential range of 0.3~2.5 V at room temperature. Its rate performance is as Figure 4 show...

Embodiment 3

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

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

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Abstract

The invention relates to a carbon-coated ferrous sulfide negative electrode material, the preparation method and the prepared sodium ion battery thereof, Carbon-coated ferrous sulfide anode material refers to carbon-coated ferrous sulfide and its doped modified material, wherein the particle size of the ferrous sulfide is 100-500 nm, the mass of the carbon coating layer is 3-30% of the mass of theelectrode material, the doping modification elements are one or several of M=Co, Ni, Mn, Ti, Cu, Mg, Ba, Pb, Al, etc., and the mass of the doping modification elements is 0-30% of the mass of the negative electrode material. A metal sulfate and a carbon source are added into deionized water, stirred and dissolved uniformly at room temperature, freeze-dried to obtain a precursor, and calcined at high temperature in an inert atmosphere to obtain a carbon-coated ferrous sulfide negative electrode material. As that negative electrode material of the sodium ion battery, the invention has the advantage of abundant raw materials, simple preparation, short preparation period, 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 are widely used in human life, ranging from small devices such as mobile phones and computers to high-power applications such as electric vehicles and smart grids. However, the uneven distribution of lithium resources and high cost limit the large-scale application of lithium-ion batteries. Sodium-ion batteries have a similar working principle to lithium-ion batteries. At the same time, due to their low price and abundant reserves, they have unique advantages in the fields of next-generation transportation and power grids. [0003] Transition metal sulfides have attracted more...

Claims

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Application Information

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Patent Type & Authority Applications(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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