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Nickel phosphide/carbon/nickel phosphide composite material as well as preparation method and application thereof

A composite material, nickel phosphide technology, applied in the field of materials, can solve problems such as performance to be improved, and achieve the effects of improving reversible lithium intercalation capacity, improving rate performance and low cost

Active Publication Date: 2021-01-08
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Ni 2 Nanomaterials such as P nanoparticles and nanosheets have been prepared, but their properties still need to be improved

Method used

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  • Nickel phosphide/carbon/nickel phosphide composite material as well as preparation method and application thereof
  • Nickel phosphide/carbon/nickel phosphide composite material as well as preparation method and application thereof
  • Nickel phosphide/carbon/nickel phosphide composite material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of Nickel Phosphide / Carbon / Nickel Phosphide Composite Materials

[0040] (1) SiO 2 The microspheres were dispersed in water, then formaldehyde and resorcinol were added, and the reaction was stirred for 24 hours to obtain SiO with a core-shell structure. 2 / resorcinol-formaldehyde oligomer complex, where SiO 2 The mass molar ratio of microspheres, formaldehyde and resorcinol is 300:0.0036:0.007, mg:mol:mol, SiO 2 / The resorcinol-formaldehyde oligomer complex was alternately washed with distilled water and absolute ethanol for 4 times, dried at 70°C to constant weight, and then placed in a tube furnace at 700°C for 5 hours under an argon atmosphere. Prepared SiO with core-shell structure 2 / C complex, and finally the SiO 2 / C complex was soaked in 2mol / L sodium hydroxide solution for 5h to remove SiO 2 SiO in / C composite 2 , to prepare hollow mesoporous carbon spheres;

[0041] (2) Dissolve urea, nickel nitrate and polyvinylpyrrolidone in ethanol solu...

Embodiment 2

[0054] Preparation of Nickel Phosphide / Carbon / Nickel Phosphide Composite Materials

[0055] (1) SiO 2 The microspheres were dispersed in water, then formaldehyde and resorcinol were added, and the reaction was stirred for 20 hours to obtain SiO with a core-shell structure. 2 / resorcinol-formaldehyde oligomer complex, where SiO 2 The mass molar ratio of microspheres, formaldehyde and resorcinol is 350:0.0038:0.008, mg:mol:mol, SiO 2 / The resorcinol-formaldehyde oligomer complex was alternately washed with distilled water and absolute ethanol for 3 times, dried at 85°C to constant weight, and then placed in a tube furnace at 800°C for 3 hours under a helium atmosphere. Prepared SiO with core-shell structure 2 / C complex, and finally the SiO 2 / C complex was soaked in 3mol / L sodium hydroxide solution for 4h to remove SiO 2 SiO in / C composite 2 , to prepare hollow mesoporous carbon spheres;

[0056] (2) urea, nickel nitrate and polyvinylpyrrolidone are dissolved in ethanol...

Embodiment 3

[0059] Preparation of Nickel Phosphide / Carbon / Nickel Phosphide Composite Materials

[0060] (1) SiO 2 The microspheres were dispersed in water, then formaldehyde and resorcinol were added, and the reaction was stirred for 22 hours to obtain SiO with a core-shell structure. 2 / resorcinol-formaldehyde oligomer complex, where SiO 2 The mass molar ratio of microspheres, formaldehyde and resorcinol is 320:0.004:0.007, mg:mol:mol, SiO 2 / The resorcinol-formaldehyde oligomer complex was alternately washed twice with distilled water and absolute ethanol, dried at 100°C to constant weight, and then placed in a tube furnace at 750°C for 4 hours under an argon atmosphere. Prepared SiO with core-shell structure 2 / C complex, and finally the SiO 2 / C complex was soaked in 5mol / L sodium hydroxide solution for 3h to remove SiO 2 SiO in / C composite 2 , to prepare hollow mesoporous carbon spheres;

[0061] (2) urea, nickel nitrate and polyvinylpyrrolidone are dissolved in ethanol solut...

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Abstract

The invention relates to a nickel phosphide / carbon / nickel phosphide composite material and a preparation method and application thereof, and belongs to the technical field of materials. The material is composed of hollow mesoporous carbon spheres and nickel phosphide nanoparticles loaded on the inner surfaces and the outer surfaces of the hollow mesoporous carbon spheres, the internal hollow structure of the material enables electrolyte to easily permeate into the internal area of an electrode so as to reduce internal resistance and improve rate capability, and the nickel phosphide nanoparticles can be dispersed on the inner surfaces and the outer surfaces of the hollow mesoporous carbon spheres at the same time so as to improve rate capability. Agglomerationamong the nickel phosphide nanoparticles is relieved, so that the nickel phosphide nanoparticles have a larger contact area with an electrolyte, more lithium ion de-intercalation and intercalation positions can be provided, the reversible lithium intercalation capacity of the material is more effectively improved, volume expansion in the discharging / charging process is favorably relieved, and when the composite material is usedas a lithium ion battery negative electrode material, the capacity of the composite material is kept at 465mAh. g<-1 > after 200 cycles under the current density of 100mA. g <-1 >. The preparation method of the composite material is simple, easy to operate, low in cost and suitable for expanded production.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a nickel phosphide / carbon / nickel phosphide composite material and a preparation method and application thereof. Background technique [0002] Human needs continue to increase, but traditional energy sources tend to be exhausted, and the supply and demand of human energy will no longer be balanced. Moreover, the use of traditional energy will cause environmental pollution, so it is urgent to develop green and sustainable new energy at this stage. Some experts once pointed out that the battery industry will gradually emerge and occupy an important position in the energy industry, and lithium-ion batteries will become one of the most ideal green power sources in the 21st century. Therefore, the significance of research and development of lithium-ion battery materials is self-evident. [0003] Lithium-ion batteries (LIBs) are mainly used in various fields such as powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B25/08C01B32/05
CPCH01M4/366H01M4/5805H01M4/625H01M4/628H01M10/0525C01B25/08C01B32/05C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2004/80C01P2004/62H01M2004/021H01M2004/027Y02E60/10
Inventor 杨霞张敏胡紫娟
Owner SOUTHWEST UNIV
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