Crosslinked nano carbon plate loaded nickel selenide/manganese selenide nano composite material, preparation method thereof and sodium ion battery negative electrode

A technology of manganese selenide nano- and nano-carbon sheets, which is applied in the direction of negative electrodes, battery electrodes, nanotechnology, etc., can solve problems affecting battery cycle and rate performance, low energy density of sodium-ion batteries, and reduced electrochemical performance of batteries. Achieve excellent cycle stability, enhance cycle stability and rate performance, and enhance reaction kinetics

Pending Publication Date: 2022-02-15
ANHUI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are still many problems to be solved in sodium-ion batteries. First, the relative atomic mass of sodium is much higher than that of lithium, resulting in a theoretical specific capacity less than half of that of lithium. Secondly, the radius of sodium ions is larger than that of lithium ions. It is more difficult to intercalate and extract in the material, resulting in a low diffusion rate of sodium ions, resulting in volume expansion and structural damage during use; in addition, although Na + / Na pair standard electrode potential ratio Li + / Li is high, but the energy density of Na-ion batteries is lower than that of Li-ion batteries of the same type
These existing defects affect the cycle and rate performance of the battery, thereby reducing the electrochemical performance of the battery

Method used

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  • Crosslinked nano carbon plate loaded nickel selenide/manganese selenide nano composite material, preparation method thereof and sodium ion battery negative electrode
  • Crosslinked nano carbon plate loaded nickel selenide/manganese selenide nano composite material, preparation method thereof and sodium ion battery negative electrode
  • Crosslinked nano carbon plate loaded nickel selenide/manganese selenide nano composite material, preparation method thereof and sodium ion battery negative electrode

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Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing a crosslinked nano-carbon sheet loaded nickel selenide / manganese selenide nanoparticle composite material, comprising the following steps:

[0037] (1) Put 10g of trisodium citrate in a high-temperature tube furnace, react in a nitrogen atmosphere at 400°C for 6 hours, wash and dry the product after cooling, and obtain a cross-linked nano-carbon sheet material. The SEM image is as follows figure 1 As shown, it can be seen from the figure that its morphology is a cross-linked nanosheet;

[0038] (2) Dissolve 0.172g of nickel chloride hexahydrate and 0.228g of potassium permanganate in 5mL of water, then add 0.1g of cross-linked nano-carbon sheet material to disperse in water, stir for 0.5h, and transfer to the reaction of polytetrafluoroethylene In the kettle, hydrothermal reaction at 100°C for 24 hours, the obtained product was washed with deionized water and dried to obtain the precursor;

[0039] (3) Mix the precursor obtained in step (2) with ...

Embodiment 2

[0041] A method for preparing a crosslinked nano-carbon sheet loaded nickel selenide / manganese selenide nanoparticle composite material, comprising the following steps:

[0042] (1) 20 g of trisodium citrate is placed in a high-temperature tube furnace, reacted at 550° C. for 4 hours in a nitrogen atmosphere, and the product is washed and dried after cooling to obtain a cross-linked carbon nanosheet material;

[0043] (2) Dissolve 0.329g of nickel sulfate heptahydrate and 0.371g of potassium permanganate in 6mL of water, then add 0.1g of cross-linked nano-carbon sheet material to disperse in water, stir for 1h, and transfer to a polytetrafluoroethylene reaction kettle , hydrothermal reaction at 120°C for 20 hours, the obtained product was washed with deionized water and dried to obtain a precursor;

[0044] (3) Mix the precursor obtained in step (2) with 0.408g of selenium powder, place the sample in a porcelain boat, and in a tube furnace, in a mixed gas of hydrogen and argon...

Embodiment 3

[0046] A method for preparing a crosslinked nano-carbon sheet loaded nickel selenide / manganese selenide nanoparticle composite material, comprising the following steps:

[0047] (1) 40 g of trisodium citrate is placed in a high-temperature tube furnace, reacted at 700° C. for 3 hours in a nitrogen atmosphere, and the product is washed and dried after cooling to obtain a cross-linked carbon nanosheet material;

[0048] (2) Dissolve 0.479g of nickel nitrate hexahydrate and 0.521g of potassium permanganate in 8mL of water, then add 0.1g of cross-linked nano-carbon sheet material to disperse in water, stir for 2h, and transfer to a polytetrafluoroethylene reaction kettle , hydrothermal reaction at 140°C for 15 hours, the obtained product was washed with deionized water and dried to obtain a precursor;

[0049] (3) Mix the precursor obtained in step (2) with 0.573g of selenium powder, place the sample in a porcelain boat, and in a tube furnace, in a mixed gas of hydrogen and argon ...

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PUM

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Abstract

The invention discloses a cross-linked nano carbon plate loaded nickel selenide / manganese selenide nano composite material, a preparation method thereof and a sodium ion battery negative electrode. The preparation method comprises the following steps: performing high-temperature carbonization on trisodium citrate serving as a raw material in an inert atmosphere to prepare a cross-linked nano carbon plate material; dissolving a nickel source and a manganese source in water, adding the cross-linked nano carbon sheet material, stirring, dissolving and carrying out hydrothermal reaction in sequence, and washing and drying an obtained product to obtain a precursor material; enabling the precursor material and selenium powder to be subjected to a heating reaction in hydrogen and argon mixed gas, and obtaining a cross-linked nano carbon plate loaded nickel selenide / manganese selenide nano particle composite material. The material can load more nickel selenide / manganese selenide nanoparticles by taking the cross-linked nano carbon plate as a carrier, shortens electron and sodium ion transmission paths, improves the conductivity of an electrode material, and can be used as an active material of a sodium-ion battery negative electrode, so that the sodium-ion battery negative electrode with excellent cycling stability and rate capability is obtained.

Description

technical field [0001] The invention belongs to the technical field of sodium-ion batteries, and in particular relates to a cross-linked nano-carbon sheet loaded nickel selenide / manganese selenide nanoparticle composite material, a preparation method thereof, and a negative electrode of a sodium-ion battery. Background technique [0002] In recent years, with the rapid development of industries such as electronic equipment, the manufacturing cost of batteries, the degree of environmental pollution, and the recycling rate have also become important indicators for evaluating battery materials. At present, industries such as digital transportation are increasingly dependent on lithium-ion batteries, and the contradiction between the shortage of lithium resources and high demand is becoming more and more prominent. Since sodium and lithium belong to the same main group element and have similar physical and chemical properties, if a material with excellent performance, safety and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/58H01M4/136H01M10/054B82Y30/00B82Y40/00
CPCH01M4/625H01M4/581H01M4/364H01M4/136H01M10/054B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 王俊陶春明高绿绿曹雅娴黄家锐
Owner ANHUI NORMAL UNIV
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