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Micron-sized porous sodium ferrous sulfate/carbon composite positive electrode material and sodium ion battery or sodium battery prepared from same

A technology for sodium ferrous sulfate and sodium ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as damage to battery long-term cycle stability, structural agglomeration, and reduce the compaction density of positive electrodes, so as to achieve abundant raw material reserves , enhance electronic conductivity, improve the effect of tap density

Active Publication Date: 2022-02-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanomaterials with a high specific surface area reduce the compaction density of the positive electrode, and are prone to structural agglomeration during the intercalation / extraction of sodium ions, which impairs the long-term cycle stability of the battery.

Method used

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  • Micron-sized porous sodium ferrous sulfate/carbon composite positive electrode material and sodium ion battery or sodium battery prepared from same
  • Micron-sized porous sodium ferrous sulfate/carbon composite positive electrode material and sodium ion battery or sodium battery prepared from same
  • Micron-sized porous sodium ferrous sulfate/carbon composite positive electrode material and sodium ion battery or sodium battery prepared from same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The synthesis steps of the micron-scale porous sodium ferrous sulfate / carbon composite cathode material used in the present invention are as follows: Weigh 0.02g graphene oxide dry powder and disperse it in 20mL deionized water (1mg / mL), then add 10mL ethylene glycol, and stir for 1h , sonicated for 15 minutes to form a graphene oxide dispersion. Another weighed 1.112g ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O), 0.5682g anhydrous sodium sulfate (Na 2 SO 4 ), 0.2 g of citric acid monohydrate, and 0.02 g of ascorbic acid were dissolved in the above graphene oxide dispersion, and stirred at room temperature (25° C.) for 1 h. Take 40 mL of isopropanol and add it dropwise to the above solution to obtain a cloudy suspension. After the dropwise addition was completed, stir for another 1 h. The above turbid suspension was centrifuged (centrifugation speed was 8500r / min, centrifugation time was 3min), the obtained solid was frozen by liquid nitrogen, and then freeze-drie...

Embodiment 2

[0050] The preparation of the micron-scale porous sodium ferrous sulfate / carbon composite cathode material in this example is the same as that in Example 1.

[0051] The prepared micron-scale porous sodium ferrous sulfate / carbon composite positive electrode material is used as the positive electrode active material, commercial hard carbon is used as the negative electrode active material, and the positive electrode active material is mixed with acetylene black and polyvinylidene fluoride in a mass ratio of 70:20:10 , using 1-methyl-2-pyrrolidone as a dispersant; the negative electrode active material is mixed with acetylene black and sodium carboxymethylcellulose (CMC) in a mass ratio of 80:10:10, and deionized water is used as a dispersant; the above The mixture was evenly mixed to form a slurry, which was coated on the aluminum foil and the copper foil respectively, and dried and cut in vacuum at 120° C. to obtain the corresponding positive electrode sheet and negative electr...

Embodiment 3

[0053] The preparation of the micron-scale porous sodium ferrous sulfate / carbon composite cathode material in this example is the same as that in Example 1.

[0054] The prepared micron-scale porous sodium ferrous sulfate / carbon composite positive electrode material is used as the positive electrode active material, and the ferrous sulfide / carbon composite material is used as the negative electrode active material. Mass ratio mixing, using 1-methyl-2-pyrrolidone as a dispersant; negative electrode active material, acetylene black, and sodium carboxymethylcellulose (CMC) in a mass ratio of 80:10:10, using deionized water as a dispersant ; Mix the above mixture evenly to form a slurry and apply it on the aluminum foil and copper foil respectively, dry and cut in vacuum at 120°C to obtain the corresponding positive electrode sheet and negative electrode sheet. The positive and negative electrodes were separated by glass fiber membrane (Whatman GF / D), using 1M NaClO 4 Dissolved i...

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Abstract

The invention discloses a micron-sized porous sodium ferrous sulfate / carbon composite positive electrode material and a sodium ion battery or a sodium battery prepared from the same. The composite material comprises a sodium ferrous sulfate / carbon composite material containing and / or not containing metal doping elements, is prepared by using a coprecipitation and solid-phase calcination method, has a particle size of 2-30 [mu]m, has a porous structure, and is formed by tightly packing 80-200 nm primary particles tightly coated by amorphous carbon. The surface layer of the micron particles is covered by the reduced graphene thin layer to form a three-dimensional conductive network; according to the present invention, the micron-sized particle positive electrode material has higher tap density so as to easily improve the volume energy density of the battery, the material is adopted as the sodium ion battery or the sodium battery positive electrode, and has advantages of rich raw material, low cost, high working voltage, good rate capability and good cycle stability, and the preparation process of the material is simple. The sodium ion battery or the sodium battery provided by the invention has the advantage of high energy density and has a good market application prospect.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium ion batteries, in particular to a micron-scale porous sodium ferrous sulfate / carbon composite anode material capable of charging and discharging sodium ions and a high-voltage, high-power sodium-ion battery or sodium battery containing the material. Background technique [0002] As a medium for energy transmission between renewable energy and large-scale energy storage systems, sodium-ion batteries are regarded as one of the most promising next-generation energy storage systems due to their abundant resource reserves and low cost. However, for the needs of large-scale energy storage power stations and new energy trams, the existing sodium-ion battery technology cannot meet the application requirements of new technologies, especially the cost and energy density of the positive electrode. Therefore, the development of Na-ion batteries with low cost, high energy density, high power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/362H01M4/5825H01M4/583H01M10/054Y02E60/10
Inventor 陈卫华张继雨颜永亮杨明睿
Owner ZHENGZHOU UNIV
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