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NiS2 composite material as well as preparation method and application thereof

A composite material, Y-S technology, used in nanotechnology for materials and surface science, active material electrodes, nanotechnology, etc., can solve problems such as reduced cycle performance and cycle life, poor electron/ion transport, limited contact points, etc. , to achieve the effect of good stability, high capacity and excellent rate performance

Active Publication Date: 2022-05-06
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as reported, Y-S structures generally exhibit larger yolk size and limited contact points between yolk and shell
These factors will lead to poor electron / ion transport, reduced cycle performance and cycle life

Method used

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  • NiS2 composite material as well as preparation method and application thereof
  • NiS2 composite material as well as preparation method and application thereof
  • NiS2 composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]1) Disperse 0.3g PVP (MW: 40000) in the mixture of 20ml water and 20ml ethylene glycol, stir and dissolve evenly, add 1mmol nickel acetate and 3mmol sodium thiosulfate, stir and dissolve into a uniform solution, transfer it to a 100ml reactor, place it in a 180 ℃ hydrothermal tank, keep it warm for 12h, cool naturally, centrifuge the obtained suspension, wash it with water and ethanol, and finally disperse the washed precipitate in methanol for standby, So you get NIS 2 Methanol dispersion of nanoparticles.

[0051] 2) The obtained NIS with the size of 100-150 NM 2 30mg of the dispersion of nanoparticles was dispersed in 15ml Tris buffer (pH = 8.5), 10mg dopamine DA was added, stirred at room temperature for 16h, centrifuged to remove the mother liquor, precipitated and washed with methanol to obtain NIS 2 @Methanol dispersion of PDA (polydopamine).

[0052] 3) NIS 2 @10mg of methanol dispersion of PDA (polydopamine) was added to Zn (no) containing 0.5mmol 3 ) 2 After ultras...

Embodiment 2

[0065] The difference between this embodiment and embodiment 1 is that zinc sulfate is used instead of zinc nitrate in step 2), and Y-S NIS in step 4) 2@The mass ratio of zif-8 and sulfur powder is 1:2, the annealing temperature is 500-800 ℃, the temperature is raised at a uniform rate from 500 ℃ for 8 h to 800 ℃, and then it is naturally cooled to room temperature. After carbonization, the product is Y-S NIS 2 @C 1 @C 2 compound material.

example 3

[0066] Example 3 (to scale)

[0067] 1) Disperse 0.3gpvp (MW: 40000) in the mixture of 20ml water and 20ml ethylene glycol, stir and dissolve evenly, add 1mmol nickel acetate and 3mmol sodium thiosulfate, stir and dissolve into a uniform solution, transfer it to a 100ml reactor, place it in a 180 ℃ hydrothermal tank, keep it warm for 12h, cool naturally, centrifuge the obtained suspension, wash it with water and ethanol, and finally disperse the washed precipitate in methanol for standby, So you get NIS 2 Methanol dispersion of nanoparticles.

[0068] 2) The obtained NIS with the size of 100-150 NM 2 10mg of dispersion of nanoparticles was added to Zn (no) containing 0.5mmol 3 ) 2 After ultrasonic homogenization, add the methanol solution containing 1mmol of dimethylimidazole under stirring, stir for 1min, stand for 24h, filter, wash with methanol, and dry to obtain NIS wrapped in 2-methylimidazole zinc salt (zif-8) 2 Complex (NIS) 2 @ZIF-8)；

[0069] 3) NIS 2 @Zif-8 was dispersed...

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Abstract

The invention discloses a NiS2 composite material and a preparation method and application thereof, the composite material is Y-S NiS2 (at) C1 (at) C2, C1 refers to an inner carbon shell layer, C2 refers to an outer carbon shell layer, NiS2 refers to a NiS2 compound, and Y-S refers to a bell-shaped core-shell structure. The preparation method comprises the following steps: coating NiS2 nano-particles with dopamine DA in a polymerization manner to obtain NiS2 coated PDA; the preparation method comprises the following steps: coating NiS2 (at) PDA with 2-methylimidazole zinc salt ZIF-8 to obtain a ZIF-8 coated NiS2 compound NiS2 (at) PDA (at) ZIF-8; the NiS < 2 > (at) PDA (at) ZIF-8 is etched with tannic acid, and a bell-shaped compound Y-S NiS < 2 > (at) PDA (at) ZIF-8 with gaps inside is obtained; the Y-S NiS < 2 > (at) PDA (at) ZIF-8 is subjected to annealing, carbonization and acid pickling to remove zinc sulfide, and then the Y-S NiS < 2 > (at) C1 (at) C2 composite material is obtained and applied to a potassium ion battery.

Description

technical field [0001] The invention belongs to the field of new energy, in particular to a NIS 2 Composite material and its preparation method and application. Background technology [0002] In potassium ion batteries, nickel based sulfide NIS 2 Because of its moderate cost and high theoretical capacity, it is widely used in negative electrode materials. However, its poor conductivity and large volume change lead to its poor power storage performance. Construction of nanostructured NIS 2 And compounding with high conductivity carbon materials (carbon nanotubes, graphene, hard carbon, etc.) is an effective way to solve the above problems. [0003] Therefore, Kang et al designed Y-S Ni fesulfide @ C nanospheres with yolk shell (Y-S) structure with internal void space to achieve good structural stability. (Chemical Engineering Journal, DOI. Org / 10.1016 / j.cej. 2020.127963) after 250 cycles, it can maintain a capacity of 297 MAH g-1 at 0.1 A g-1. However, as reported, Y-S structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054B82Y30/00B82Y40/00
CPCH01M4/366H01M4/5815H01M4/583H01M10/054B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 赵毅甘艳美
Owner FUJIAN NORMAL UNIV