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Zinc phosphide material, zinc phosphide composite material and preparation method and application thereof

A composite material, zinc phosphide technology, applied in phosphorus compounds, chemical instruments and methods, phosphide and other directions, can solve problems affecting actual use, reduce cycle stability, etc., to improve battery performance, make up for reduced conductivity, cost low effect

Pending Publication Date: 2022-06-24
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the huge volume expansion generated during the charging and discharging process seriously reduces its cycle stability, thus affecting its practical use.

Method used

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  • Zinc phosphide material, zinc phosphide composite material and preparation method and application thereof
  • Zinc phosphide material, zinc phosphide composite material and preparation method and application thereof
  • Zinc phosphide material, zinc phosphide composite material and preparation method and application thereof

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preparation example Construction

[0032] see figure 1 , Some embodiments of the present invention also provide a method for preparing the above zinc phosphide material, which comprises: ball milling a mixture of metallic zinc, zinc oxide and phosphorus.

[0033] By using zinc oxide, zinc metal and elemental phosphorus as raw materials, the raw material sources are wide and the cost is low, and a relatively stable redox reaction can occur between the three through a simple one-step ball milling process to obtain a certain mass ratio of phosphoric acid Zinc doped zinc phosphide material. That is, the material is obtained by simple ball milling, and the material does not require other post-processing. The cost of raw materials and final products is low, and it is convenient to adjust the zinc phosphate doping ratio through the ratio of raw materials, which is conducive to the large-scale production and use of products.

[0034]In order to make the reaction process more stable and the material uniformity after th...

Embodiment 1

[0051] The present embodiment provides a method for preparing a zinc phosphide material, which is specifically as follows:

[0052] Zn metal (2.2 g) with an average particle size of 20 μm, ZnO (1.0 g) with an average particle size of 200 nm and red phosphorus (2.7 g) with an average particle size of 20 μm were mixed and carried out under an argon atmosphere. In ball milling, the ratio of ball to material is 40:1, the rotation speed is 800 rpm, and the time is 4 h to obtain a zinc phosphate doped zinc phosphide material with a mass fraction of 10 wt %.

Embodiment 2

[0054] The present embodiment provides a method for preparing a zinc phosphide material, which is specifically as follows:

[0055] Zn metal (0.7 g) with an average particle size of 20 μm, ZnO (1.0 g) with an average particle size of 200 nm, and red phosphorus (1.2 g) with an average particle size of 20 μm were mixed and carried out under an argon atmosphere. Ball milling, with a ball-to-material ratio of 40:1, a rotational speed of 800 rpm, and a time of 4 h, to obtain a zinc phosphate-doped zinc phosphide material with a mass fraction of 20 wt%.

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Abstract

The invention discloses a zinc phosphide material, a zinc phosphide composite material and a preparation method and application thereof. The zinc phosphide composite material is doped with amorphous zinc phosphate. The preparation method of the zinc phosphide material comprises the following step: ball-milling a mixture of metal zinc, zinc oxide and phosphorus to obtain the zinc phosphide material. By doping zinc phosphate in zinc phosphide, volume expansion of active zinc phosphide in the charging and discharging process can be buffered, the utilization rate of the zinc phosphide material as a potassium ion negative electrode material is increased, and the cycling stability of the electrode material is improved. Through one-step ball milling, the raw materials are subjected to an oxidation-reduction reaction, and zinc phosphate is formed in situ while zinc phosphide is generated. Other post-treatment is not needed, and large-scale production and use are facilitated. In addition, a carbon material is mixed and added into the zinc phosphide material to form a composite material which is used as an active material of the negative electrode material of the potassium ion battery, so that the phenomenon that the conductivity is reduced due to the existence of zinc phosphate can be compensated.

Description

technical field [0001] The invention relates to the technical field of battery electrode materials, in particular, to a zinc phosphide material, a zinc phosphide composite material and a preparation method and application thereof. Background technique [0002] The large-scale application of fossil energy (coal, oil and natural gas) has brought about an unprecedented industrialization and information revolution for mankind, making human life more convenient. However, the resulting environmental pollution problem has caused mankind to begin to examine the traditional non-renewable rational development and use of fossil energy. In order to change the status quo, there is an urgent need to vigorously develop some new, less-polluting or even non-polluting green energy sources to make up for the energy gap caused by the reduction in the use of fossil energy, and even to meet the ever-increasing energy demands of human development. At present, these new sustainable forms of energy...

Claims

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Application Information

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IPC IPC(8): C01B25/08C01B25/37H01M4/36H01M4/58H01M10/0525
CPCC01B25/08C01B25/37H01M4/364H01M4/5805H01M10/0525C01P2002/72C01P2002/82C01P2004/03C01P2006/40C01P2004/61C01P2004/62C01P2004/64
Inventor 许冠南季顺平
Owner UNIVERSITY OF MACAU
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