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Preparation method and application of a hollow structure composite material based on nickel phosphide

A hollow structure and composite material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of reducing the electrochemical activity of sulfur cathodes, achieve the effects of inhibiting the shuttle effect, enhancing electrochemical activity, and enhancing the depth of reaction

Inactive Publication Date: 2019-04-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many polar materials are electrically insulating substances, which greatly reduces the electrochemical activity of the sulfur cathode.

Method used

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  • Preparation method and application of a hollow structure composite material based on nickel phosphide
  • Preparation method and application of a hollow structure composite material based on nickel phosphide
  • Preparation method and application of a hollow structure composite material based on nickel phosphide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) First, 0.5mmol of nickel sulfate, 100mL of isopropanol, 5mL of glycerin, and 0.5mL of distilled water were prepared into a solution, and transferred to a reaction kettle, and the water was heated in an oven at 90°C for 6 hours. Thermal reaction, the product obtained after the reaction is completed is obtained by centrifugation, and after being washed with ethanol and dried, a Ni-hollow structure material is obtained.

[0025] (2) Mix the dried Ni-hollow structure material with potassium hypophosphite at a mass ratio of 1:1, place in an argon atmosphere tube furnace, and calcinate and phosphate at 250°C for 1 hour to obtain phosphorus Nickel hollow structure material.

[0026] (3) Mix the nickel phosphide hollow structure material obtained in step (2) with the sublimed sulfur at a mass ratio of 1:0.5, grind it evenly, heat it to melt at 120°C for 5 hours under the protection of argon, and then Cool to room temperature to obtain the lithium-sulfur battery cathode mat...

Embodiment 2

[0028] (1) First, make a solution of 1mmol of nickel nitrate, 300mL of n-propanol, 10mL of ethylene glycol, and 5mL of distilled water, and transfer it to a reaction kettle. Thermal reaction, the product obtained after the reaction is completed is obtained by centrifugation, and after being washed with ethanol and dried, a Ni-hollow structure material is obtained.

[0029] (2) Mix the dried Ni-hollow structure material with ammonium hypophosphite at a mass ratio of 1:20, place it in a helium atmosphere tube furnace, and calcinate and phosphate it at 400°C for 6 hours to obtain phosphorus Nickel hollow structure material.

[0030] (3) Mix the nickel phosphide hollow structure material obtained in step (2) with the sublimed sulfur at a mass ratio of 1:4, grind it evenly, heat it to melt at 200°C for 12 hours under the protection of helium, and then Cool to room temperature to obtain nickel phosphide hollow structure composite material.

Embodiment 3

[0032] (1) First, 2mmol of nickel acetate, 200mL of n-propanol, 15mL of glycerin, and 10mL of distilled water were prepared into a solution, and transferred to a reaction kettle, and the hydrothermal reaction was carried out in an oven at 140°C and 12 hours. After the reaction, the product obtained was obtained by centrifugation, washed with ethanol, and dried to obtain a Ni-hollow structure material.

[0033] (2) Mix the dried Ni-hollow structure material with red phosphorus at a mass ratio of 1:50, place in a nitrogen atmosphere tube furnace, and calcinate and phosphate at 500°C for 12 hours to obtain nickel phosphide Hollow structural material.

[0034] (3) Mix the nickel phosphide hollow structure material obtained in step (2) with the sublimed sulfur at a mass ratio of 1:9, after grinding evenly, heat to melt at 150°C for 18 hours under nitrogen protection and then cool to room temperature, the nickel phosphide hollow structure composite material is obtained.

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Abstract

The invention discloses a preparation method and an application of a nickel phosphide hollow structure composite material. The method comprises the following steps: 1, preparing an Ni-hollow structure material through a hydrothermal reaction; 2, mixing the dried Ni-hollow structure material with a phosphorus source, placing the obtained mixture in a tubular furnace, and carrying out calcining phosphatization to obtain a nickel phosphide hollow structure material; and 3, mixing the nickel phosphide hollow structure material obtained in step 2 with sublimed sulfur, uniformly grinding the obtained mixture, heating the ground mixture until the mixture is molten, and cooling the molten mixture to room temperature in order to obtain the nickel phosphide hollow structure composite material. The composite material prepared in the invention has a large-size hollow structure, so the composite material has an obvious confinement effect on sulfur, and the shuttle effect of lithium polysulfide is obviously inhibited; and additionally, the highly-conductive composite material improves the electrochemical reaction activity of the sulfur, so the material has long cycle life and high energy density.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method and application of a composite material, in particular to a preparation method and application of a nickel phosphide-based hollow structure composite material. Background technique [0002] Lithium-sulfur batteries have a theoretical specific energy of up to 2600Wh / kg, which is more than five times that of existing lithium-ion batteries. In addition, due to the cheap cost and environmental friendliness of sulfur, lithium-sulfur batteries have been widely concerned and researched. However, since the lithium-sulfur battery uses elemental sulfur as the positive electrode, and the conductivity of sulfur is very low, in addition, lithium polysulfide, an intermediate product of lithium-sulfur battery discharge, is easily dissolved in the ether electrolyte, which causes the loss of the overall capacity and life of the battery. attenuation. This inherent sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/62H01M4/624H01M4/628Y02E60/10
Inventor 张乃庆程俊涵孙克宁范立双
Owner HARBIN INST OF TECH
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