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Bimetal selenide negative electrode material and preparation method and application thereof

A negative electrode material, selenide technology, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve the problems of limited battery cycle performance, difficulty in the decomposition of sodium oxide, poor stability of phosphide, etc., to achieve excellent electrochemical performance, Good application prospect and low cost effect

Pending Publication Date: 2022-01-11
SHAANXI UNIV OF SCI & TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon-based materials, such as graphite, have a reversible capacity of only about 300 mAh g-1 in Na-ion batteries and suffer from the problem of Na dendrite growth.
The decomposition of sodium oxide formed after metal oxide discharge is extremely difficult, and the reversibility of the battery is poor
The poor stability of phosphide limits the improvement of battery cycle performance

Method used

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  • Bimetal selenide negative electrode material and preparation method and application thereof
  • Bimetal selenide negative electrode material and preparation method and application thereof
  • Bimetal selenide negative electrode material and preparation method and application thereof

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preparation example Construction

[0044] A method for preparing a double metal selenide negative electrode material of the present invention comprises the following steps:

[0045] S1, adding the first metal salt a, the second metal salt b, and the surfactant to the mixed solution of methanol and deionized water, the ratio of the addition amount of the first metal salt a to the second metal salt b is (0.5~ 2): 1. The volume ratio of methanol to deionized water is (0.2-5): 1. Stir to fully dissolve to obtain a wine-red solution;

[0046] Preferably, the first metal salt a is selected from nickel salts, and can be one or more of nitrates, chlorides, and sulfates; the second metal salt b is selected from cobalt salts, and can be nitrates, chlorides , One or more of sulfates.

[0047]Preferably, the surfactant is one or more of amine salt type, quaternary ammonium salt type, heterocyclic type and halo salt type.

[0048] Preferably, the added amount of the surfactant is 0.5-1 g.

[0049] S2. Transfer the wine-r...

Embodiment 1

[0055] (1) Weigh 1.8mmol nickel nitrate hexahydrate, 0.9mmol cobalt nitrate hexahydrate, 1g hexadecyltrimethylammonium bromide and dissolve in a mixed solution of 60mL ethanol and 15mL deionized water, stir for 30min to obtain a clear solution ;

[0056] Put the solution into a 100mL polytetrafluoroethylene-lined reactor, react at 180°C for 20h, cool naturally, centrifuge, wash, and vacuum-dry to obtain the precursor;

[0057] (2) The precursor and selenium powder were weighed according to the mass ratio of 1:2, poured into a mortar, manually ground for 30 minutes, and mixed evenly. Under an inert atmosphere, the mixture was annealed at 350° C. for 3 hours at a low temperature to obtain a double metal selenide.

[0058] see figure 1 with figure 2 ,

Embodiment 2

[0060] (1) Dissolve 0.9mmol nickel nitrate hexahydrate, 1.8mmol cobalt nitrate hexahydrate, 1g octadecyldimethylbenzyl ammonium chloride in a mixed solution of 15mL ethanol and 60mL deionized water, and stir for 30min , to obtain a clear solution;

[0061] Put the solution into a 100mL polytetrafluoroethylene-lined reactor and react at 180°C for 20 hours; after natural cooling, centrifuge, wash, and vacuum-dry to obtain the precursor;

[0062] (2) The precursor and selenium powder were weighed according to the mass ratio of 1:2, poured into a mortar, manually ground for 30 minutes, and mixed evenly. Under an inert atmosphere, the mixture was annealed at a low temperature of 300° C. for 3 hours to obtain the above-mentioned double metal selenide.

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Abstract

The invention discloses a bimetallic selenide negative electrode material and a preparation method and application thereof. The preparation method comprises the steps: adding metal salt and a surfactant into a mixed solution of methyl alcohol and deionized water, and carrying out stirring to obtain a wine red solution; carrying out heating treatment on the prepared wine red solution, then carrying out natural cooling, and then carrying out centrifugation, washing and vacuum drying treatment to obtain a precursor; and under the inert atmosphere, mixing the precursor and selenium powder, carrying out low-temperature annealing treatment, and obtaining the bimetallic selenide. The material has higher specific discharge capacity and good rate and cycle stability, and shows great potential as a sodium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a double metal selenide negative electrode material, a preparation method and an application thereof. Background technique [0002] The development of rechargeable batteries to replace fossil fuels has attracted a lot of attention in recent years. Although lithium-ion batteries have achieved commercial success, the scarcity and high cost of lithium have severely hindered their application in large appliances and electric vehicles. Na-ion batteries are considered as ideal next-generation rechargeable batteries due to their electrochemical performance comparable to that of lithium-ion batteries and the use of abundant sodium as an energy storage medium. [0003] However, the large radius of Na ion limits its kinetic performance, hindering its commercial application. So far, a variety of anode materials for Na-ion batteries have been investigated, includin...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/054
CPCH01M4/362H01M4/58H01M10/054H01M2004/027Y02E60/10
Inventor 王晓飞裴晨晨刘海星原晓艳霍京浩刘毅赵丹郭守武
Owner SHAANXI UNIV OF SCI & TECH
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