Hollow spherical bimetallic chalcogenide, preparation method and sodium battery negative electrode

A chalcogenide, hollow spherical technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of capacity loss, electrode material pulverization capacity decay, slow kinetics, etc., and achieves easy operation and low preparation cost. , easy-to-control effects

Active Publication Date: 2021-05-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of repeated charge and discharge, there are still disadvantages such as volume expansion leading to rapid decay of electrode material pulverization capacity, irreversible capacity loss, and slow kinetics.

Method used

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  • Hollow spherical bimetallic chalcogenide, preparation method and sodium battery negative electrode
  • Hollow spherical bimetallic chalcogenide, preparation method and sodium battery negative electrode
  • Hollow spherical bimetallic chalcogenide, preparation method and sodium battery negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A method for preparing a hollow spherical bimetallic chalcogenide material, comprising the following steps:

[0046] (1) 0.25mmol of Co(NO 3 ) 2 ·6H 2 O and 0.125mmol of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 8 mL of glycerol and 40 mL of isopropanol to form a clear pink solution. The solution was then transferred to an autoclave and kept at 180 °C for 6 h. After naturally cooling to room temperature, the brown precipitate was separated by centrifugation, washed several times with deionized water and ethanol, and dried in an oven at 80 °C. Finally, the NiCo-glycerate precursor is obtained, and its SEM picture is attached figure 1 shown.

[0047] (2) Dissolve 30 mg of NiCo-glycerate precursor prepared in step (1) in 30 mL of deionized water, stir vigorously for about 30 min, and then dissolve 160 mg of Na 2 S·9H 2 O was added and stirred for 15-20 min to obtain a black solution. The solution was then transferred to an autoclave and kept at 160 °C for 8 h. After...

Embodiment 2

[0052] Graded spherical NiCo 2 S 4 The preparation of nanomaterials comprises the following steps:

[0053] (1) 0.25mmol of Co(NO 3 ) 2 ·6H 2 O and 0.125mmol of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 8 mL of glycerol and 40 mL of isopropanol to form a clear pink solution. The solution was then transferred to an autoclave and kept at 180 °C for 6 h. After naturally cooling to room temperature, the brown precipitate was separated by centrifugation, washed several times with deionized water and ethanol, and dried in an oven at 80 °C. Finally, the NiCo-glycerate precursor is obtained, and its SEM picture is attached figure 1 shown.

[0054] (2) Dissolve 30 mg of NiCo-glycerate precursor prepared in step (1) in 30 mL of deionized water, stir vigorously for about 30 min, and then dissolve 160 mg of Na 2 S·9H 2 O was added and stirred for 15-20 min to obtain a black solution. The solution was then transferred to an autoclave and kept at 120 °C for 8 h. After natural cooli...

Embodiment 3

[0056] Graded spherical NiCo 2 S 4 The preparation of nanomaterials comprises the following steps:

[0057] (1) 0.25mmol of Co(NO 3 ) 2 ·6H 2 O and 0.125mmol of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 8 mL of glycerol and 40 mL of isopropanol to form a clear pink solution. The solution was then transferred to an autoclave and kept at 180 °C for 6 h. After naturally cooling to room temperature, the brown precipitate was separated by centrifugation, washed several times with deionized water and ethanol, and dried in an oven at 80 °C. Finally, the NiCo-glycerate precursor is obtained, and its SEM picture is attached figure 1 shown.

[0058] (2) Dissolve 30 mg of NiCo-glycerate precursor prepared in step (1) in 30 mL of deionized water, stir vigorously for about 30 min, and then dissolve 160 mg of Na 2 S·9H 2 O was added and stirred for 15-20 min to obtain a black solution. The solution was then transferred to an autoclave and kept at 180 °C for 8 h. After natural cooli...

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Abstract

The invention discloses a hollow spherical bimetallic chalcogenide (Ni0.33Co0.67SSe), a preparation method and a sodium battery negative electrode, and belongs to the technical field of preparation of secondary battery electrode materials. The preparation method comprises the following steps: firstly preparing a nickel cobalt glycerate precursor, then mixing the nickel cobalt glycerate precursor with sodium sulfide nonahydrate, carrying out hydrothermal reaction to synthesize a hollow spherical NiCo2S4 nano material, finally mixing the vulcanized NiCo2S4 nano material with a selenium powder, and carrying out high-temperature calcination to obtain the Ni0.33Co0.67SSe material which is a hollow spherical structure assembled by first-grade nano particles. The structure can well relieve the phenomenon that the active substance structure collapses due to volume expansion in s circulation process, double anions and cations can improve the conductivity of the transition metal chalcogenide, the sodium ion battery negative electrode prepared from the transition metal chalcogenide as the active substance has good circulation stability, and when the current density is 5A g<-1>, the capacity of the battery still reaches 534.7 mA h g<-1> after 2000 cycles; and even under the current density of 20A g<-1>, the excellent rate capacity of 608.1 mA h g<-1> is shown.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for sodium ion batteries, and in particular relates to a hollow spherical bimetallic chalcogenide compound, a preparation method and a negative electrode material for sodium batteries. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in various aspects of human daily life due to their high energy density and excellent cycle stability. However, the low content and uneven distribution of lithium in the earth has prompted people to look for other energy storage systems that can replace lithium. In next-generation energy storage systems, sodium-ion batteries (SIBs) have attracted extensive attention due to their low cost and abundant natural resources. In addition, the basic mechanism of the electrochemical reaction of sodium is similar to LIBs system. However, larger Na metal ion radii usually lead to sluggish reaction kinetics, instability of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136H01M4/62H01M10/054
CPCH01M4/5815H01M4/136H01M4/621H01M4/624H01M10/054H01M2004/027Y02E60/10
Inventor 曾毅郑莹莹郑伟涛
Owner JILIN UNIV
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