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Dianion cobalt-based selenium sulfide and preparation method thereof

A double anion and sulfide technology, applied in the direction of active material electrodes, electrochemical generators, electrical components, etc., can solve the problems of low conductivity and poor capacity of metal sulfides, so as to improve conductivity and electrochemical performance , improve the effect of cycle stability

Active Publication Date: 2019-12-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the ionic radius of sodium ions (r=1.06 Å) is larger than that of lithium ions (r=0.76 Å), electrode materials suitable for lithium-ion batteries are not necessarily suitable for sodium-ion batteries
Among them, metal selenide is not only suitable for both lithium-ion batteries and sodium-ion batteries, but also has a high specific capacity, but there are still problems of low conductivity and poor capacity relative to metal sulfides.

Method used

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  • Dianion cobalt-based selenium sulfide and preparation method thereof
  • Dianion cobalt-based selenium sulfide and preparation method thereof
  • Dianion cobalt-based selenium sulfide and preparation method thereof

Examples

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Embodiment 1

[0041] (1) Weigh 1.1508 g of cobalt nitrate and dissolve it in 80 mL of the Co salt solution in methanol, weigh 1.6231 g of 2-methylimidazole and dissolve it in 80 mL of the 2-methylimidazole solution in methanol, and dissolve the 2 - Pour the methylimidazole solution into the cobalt salt solution, and leave it to age for 24 hours. After centrifugation, washing, and blast drying, the precursor is obtained;

[0042] (2) Weigh 2 mmol of selenium powder, disperse it in absolute ethanol at 0°C, add 4 mmol of sodium borohydride, and fully react until no bubbles are generated to obtain a selenium source solution;

[0043] (3) Dissolve 2 mmol of thioacetamide in 10 mL of ultrapure water to obtain a sulfur source solution; weigh 1 mmol of precursor and 30 mg of graphene oxide, disperse them in 35 mL of ultrapure water, and then add After the sulfur source solution was stirred at room temperature for 5 minutes, the selenium source solution was added dropwise. After the dropwise additio...

Embodiment 2

[0048] (1) Weigh 1.1508 g of cobalt nitrate and dissolve it in 80 mL of methanol to obtain the Co salt solution. Weigh 1.6231 g of 2-methylimidazole and dissolve it in 80 mL of methanol to obtain the 2-methylimidazole solution. After fully dissolving , pour the 2-methylimidazole solution into the cobalt nitrate solution, and leave it to age for 24 hours. After centrifugation, washing, and blast drying, the precursor is obtained;

[0049] (2) Weigh 2 mmol of selenium powder, disperse it in absolute ethanol at 0°C, add 4 mmol of sodium borohydride, and fully react until no bubbles are generated to obtain a selenium source solution;

[0050] (3) Dissolve 2 mmol of thioacetamide in 10 mL of ultrapure water to obtain a sulfur source solution; weigh 2 mmol of precursor and 40 mg of graphene oxide, disperse them in 35 mL of ultrapure water, and pour Add the sulfur source solution, stir at room temperature for 5 minutes, then add the selenium source solution dropwise, react at 180°C f...

Embodiment 3

[0054] (1) Weigh 1.1508 g of cobalt nitrate and dissolve the Co salt solution in 80 mL of methanol; weigh 1.6231 g of 2-methylimidazole and dissolve it in 80 mL of 2-methylimidazole solution in methanol; The 2-methylimidazole solution was poured into the cobalt nitrate solution, and left to age for 24 hours. After centrifugation, washing, and blast drying, the precursor was obtained;

[0055] (2) Weigh 2 mmol of selenium powder, disperse it in absolute ethanol at 0°C, add 4 mmol of sodium borohydride, and fully react until no bubbles are generated to obtain a selenium source solution;

[0056] (3) Dissolve 2 mmol of thioacetamide in 10 mL of ultrapure water to obtain a sulfur source solution; weigh 2 mmol of precursor and 50 mg of graphene oxide, disperse them in 35 mL of ultrapure water, add sulfur After stirring the source solution at room temperature for 5 minutes, add the selenium source solution dropwise, and react at 180°C for 16 hours after the dropwise addition. After ...

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Abstract

The invention discloses a dianion cobalt-based selenium sulfide and a preparation method thereof. The chemical general formula of the dianion cobalt-based selenium sulfide is Co0.85Se1-xSx@rGO, and xis larger than 0 and smaller than or equal to 0.5. The preparation method comprises the following steps of: firstly, reacting cobalt salt with 2-methylimidazole to generate a precursor, then mixing the precursor with graphene oxide, attaching the precursor to the surface of the graphene oxide, and finally, adding a sulfur source and a selenium source for hydrothermal reaction, realizing synchronous combination of a sulfur source and a selenium source with cobalt in athe precursor to form Co0.85Se particles which are uniformly wound by reduced graphene oxide and are doped with bulk phase S andthus acquiring the dianion cobalt-based selenium sulfide. The battery negative electrode material prepared by using the dianion cobalt-based selenium sulfide has characteristics of good electrical conductivity and excellent cycle stability.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, and in particular relates to a double anion cobalt-based selenium sulfide and a preparation method thereof. Background technique [0002] With the irreversible consumption of fossil energy, new energy has become an indispensable part of people's life, among which the application of lithium-ion batteries is the most common. However, with the continuous consumption of lithium resources, the lack of lithium resources has severely limited the wide-scale application of lithium-ion batteries in the future. Sodium resources are abundant in the earth and relatively cheap. Sodium-ion batteries have increasingly become the focus of development in academia and industry. However, sodium-ion batteries still have the problem of low energy density, which is not in line with the future development of high specific energy and high power, which requires the development of high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/581H01M4/5815H01M4/624H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 欧星王春辉叶隆张宝张佳峰
Owner CENT SOUTH UNIV
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