Preparation method and application of carbon-coated zinc diphosphide composite material prepared by three-step method

A technology of carbon-coated zinc diphosphide and composite materials, which is applied in the field of composite materials, can solve the problems of complexity, long cycle of metal phosphide preparation methods, and unsuitability for large-scale production, and achieve low preparation cost, excellent rate performance, The effect of high specific capacity

Active Publication Date: 2021-09-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems that the metal phosphide preparation method is long, complicated and unsuitable for large-scale production, and provides a three-step method for preparing carbon-coated zinc diphosphide composite materials

Method used

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  • Preparation method and application of carbon-coated zinc diphosphide composite material prepared by three-step method
  • Preparation method and application of carbon-coated zinc diphosphide composite material prepared by three-step method
  • Preparation method and application of carbon-coated zinc diphosphide composite material prepared by three-step method

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Embodiment 1

[0039] A method for preparing a carbon-coated zinc diphosphide composite material, the specific operation steps are as follows:

[0040] Take a zinc block with a volume of 3cm*3cm*3cm and put it into the copper crucible of the DC arc plasma equipment, adjust the distance between the tungsten rod and the zinc block to 2cm, close the door and seal it. Use a combination of a mechanical pump and a molecular pump to evacuate the chamber to -0.1MPa, and then fill it with a mixture of 0.03MPa argon and 0.01MPa hydrogen. After arcing, adjust the working current of the equipment to 60A and the working voltage to 15V. After the zinc block is fully evaporated and collides with the argon molecules in the chamber, the energy of the zinc atoms will be lost and cooled to nucleate and grow to form a powder, which is deposited on the inner wall of the water-cooled reaction chamber and pass a certain amount of air to passivate it. Finally, air is filled to normal pressure to collect zinc nanop...

Embodiment 2

[0045] A method for preparing a carbon-coated zinc diphosphide composite material, the specific operation steps are as follows:

[0046] Take a 4cm*3cm*4cm zinc block and put it into the copper crucible of the DC arc plasma equipment, adjust the distance between the tungsten rod and the zinc block to 3cm, close the door and seal it. Use a combination of a mechanical pump and a molecular pump to evacuate the chamber to -0.1MPa, and then fill it with a mixture of 0.03MPa argon and 0.01MPa hydrogen. After arcing, adjust the working current of the equipment to 70A and the working voltage to 20V. After the zinc block is fully evaporated and collides with the argon molecules in the chamber, the energy of the zinc atoms will be lost and cooled to nucleate and grow to form a powder, which is deposited on the inner wall of the water-cooled reaction chamber and pass a certain amount of air to passivate it. Finally, air is filled to normal pressure to collect zinc nanopowder.

[0047] ...

Embodiment 3

[0051] A method for preparing a carbon-coated zinc diphosphide composite material, the specific operation steps are as follows:

[0052] Take a 2cm*2cm*2cm zinc block and put it into the copper crucible of the DC arc plasma equipment, adjust the distance between the tungsten rod and the zinc block to 4cm, close the door and seal it. Use a combination of a mechanical pump and a molecular pump to evacuate the chamber to -0.1MPa, and then fill it with a mixture of 0.03MPa argon and 0.01MPa hydrogen. After arcing, adjust the working current of the equipment to 80A and the working voltage to 15V. After the zinc block is fully evaporated and collides with the argon molecules in the chamber, the energy of the zinc atoms will be lost and cooled to nucleate and grow to form a powder, which is deposited on the inner wall of the water-cooled reaction chamber and pass a certain amount of air to passivate it. Finally, air is filled to normal pressure to collect zinc nanopowder.

[0053] ...

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Abstract

The invention relates to a preparation method and an application of a carbon-coated zinc phosphide composite material prepared by a three-step method, and belongs to the technical field of lithium ion batteries. The invention aims to solve the problems of a low yield of zinc diphosphide and poor cycle performance when the zinc diphosphide is used as a lithium ion battery negative electrode material. The preparation method comprises the following steps: firstly, evaporating a zinc block into a nano zinc powder based on a direct-current arc plasma method; then synthesizing a zinc diphosphide powder by using the nano zinc powder and phosphorus through a high-temperature solid-phase reaction method; and finally, preparing the carbon-coated zinc diphosphide composite material through a mechanical ball milling method. The method is low in synthesis temperature, short in period, low in cost and high in yield. After a lithium ion battery prepared from the composite material circulates for 200 circles under the current density of 200mA / g, the reversible cycle specific capacity is 629mAh / g.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a preparation method and application of a carbon-coated zinc diphosphide composite material prepared by a three-step method. Background technique [0002] Facing the rapid development of new energy vehicles, the development direction of the lithium-ion battery market has changed. The proportion of power lithium-ion batteries in the market is increasing year by year, which forces the need to increase the capacity density of single batteries. Lithium cobalt oxide (LiCoO) is currently used as a cathode material for lithium-ion batteries. 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ) and their derivatives and commercial negative electrode material graphite are close to the theoretical specific capacity, and it is difficult to improve it. In order to achieve the medium-term development goal of power batteries (400Wh / Kg), new electrode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄昊张琳锋张贵锋吴爱民于文华
Owner DALIAN UNIV OF TECH
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