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Preparation method of lithium phosphide-based composite material and application of lithium phosphide-based composite material as lithium supplement material

A technology of composite materials and lithium phosphide, which is applied in the field of lithium-ion batteries, can solve problems such as unfavorable contact between lithium phosphide and conductive agent, difficulty in obtaining pure lithium phosphide materials, and poor electronic conductivity of lithium phosphide. Effects of improving chemical stability, shortening crystallization time, improving electronic conductivity and ion conductivity

Active Publication Date: 2022-04-12
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the reaction is a reaction between solid states, it is difficult to obtain lithium phosphide materials with high purity
Second, because lithium metal is difficult to form into particles, the prepared lithium phosphide usually presents a block shape with a large size, which is not conducive to the good contact between lithium phosphide and conductive agent, making the problem of poor electronic conductivity of lithium phosphide more prominent
Third, lithium phosphide is very easy to react with water vapor in the air, making further optimization of lithium phosphide materials (such as scale reduction, carbon coating, etc.) and application extremely difficult

Method used

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  • Preparation method of lithium phosphide-based composite material and application of lithium phosphide-based composite material as lithium supplement material
  • Preparation method of lithium phosphide-based composite material and application of lithium phosphide-based composite material as lithium supplement material
  • Preparation method of lithium phosphide-based composite material and application of lithium phosphide-based composite material as lithium supplement material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing a lithium phosphide-based lithium supplement material, comprising the following steps:

[0028] S1, dissolve a certain mass of lithium hydroxide in deionized water, the mass fraction of lithium hydroxide is 20%, put the lithium hydroxide solution into a microwave reaction furnace, evaporate the water with a power of 500W, and precipitate lithium hydroxide, then put The precipitated lithium hydroxide is placed in the heating and discharging integrated equipment.

[0029] Such as figure 1 As shown, the heating and discharging integrated equipment includes a reaction chamber, a sample stage, electrodes, a gas source, a heat source, a power supply and a vacuum pump. Both the sample stage and the electrodes are arranged in the reaction chamber; the sample stage can be rotated under the drive of the power element; the electrodes are located directly above the sample stage. The two sides of the reaction chamber are respectively provided with an air inl...

Embodiment 2

[0033] A method for preparing a lithium phosphide-based lithium supplement material, comprising the following steps:

[0034] S1, dissolve a certain mass of lithium hydroxide in deionized water, the mass fraction of lithium hydroxide is 20%, put the lithium hydroxide solution into a microwave reaction furnace, evaporate the water with a power of 300W, and precipitate lithium hydroxide, then put The precipitated lithium hydroxide is placed in the heating and discharging integrated equipment. The structure of the heating and discharging integrated equipment is the same as that of Embodiment 1.

[0035] S2, put lithium hydroxide into the chamber, pass a mixed gas of argon and phosphine into the chamber, the content ratio of phosphine and argon is 2:1, the gas flow rate is 20 sccm, and the chamber maintains atmospheric pressure , the chamber was heated at 2°C / min to 500°C and kept for 2h, and then cooled naturally.

[0036] S3, using the mixed gas of argon and methane as the pla...

Embodiment 3

[0038] A method for preparing a lithium phosphide-based lithium supplement material, comprising the following steps:

[0039] S1, a certain mass of lithium hydroxide is dissolved in deionized water, the mass fraction of lithium hydroxide is 20%, the lithium hydroxide solution is put into a microwave reaction furnace, the water is evaporated with a power of 400W, and lithium hydroxide is precipitated, and then the The precipitated lithium hydroxide is placed in the heating and discharging integrated equipment. The structure of the heating and discharging integrated equipment is the same as that of Embodiment 1.

[0040] S2, put lithium hydroxide into the chamber, pass a mixed gas of argon and phosphine into the chamber, the content ratio of phosphine and argon is 3:1, the gas flow rate is 20 sccm, and the chamber maintains atmospheric pressure , the chamber was heated at 2°C / min to 600°C and kept for 2h, and the temperature was naturally lowered.

[0041] S3, using the mixed ...

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Abstract

The invention discloses a preparation method of a lithium phosphide-based composite material and application of the lithium phosphide-based composite material as a lithium supplement material. The preparation method comprises the following steps: 1, placing a lithium hydroxide solution in a microwave environment to evaporate water in the solution, and separating out lithium hydroxide nanoparticles; and 2, placing the lithium hydroxide nano-particles in a chamber, introducing a mixed gas of hydrogen phosphide and a protective gas, and heating to convert the lithium hydroxide nano-particles into the lithium phosphide nano-particles. And 3, taking a mixed gas of methane and a protective gas as a plasma source, performing plasma discharge in the chamber filled with the lithium phosphide nanoparticles, decomposing the methane, and forming a carbon shell on the surface of the lithium phosphide nanoparticles to obtain the lithium phosphide-based composite material. Carbon shells are formed on the surfaces of the lithium phosphide particles through methane decomposition, and the carbon shells can further enhance the electronic conductivity of the lithium phosphide particles and isolate lithium phosphide from the external environment, so that the chemical stability of lithium phosphide is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium phosphide-based composite material and its application as a lithium supplement material. Background technique [0002] The energy density of current commercial lithium-ion batteries is approaching its theoretical limit. In order to further increase the energy density of lithium-ion batteries, the development of new electrode materials with high specific capacity is extremely important. Although many new electrode materials have high specific capacity, their low first Coulombic efficiency limits their practical application. In order to overcome this shortcoming, researchers are working hard to develop lithium-supplementing materials. Lithium phosphide is considered as an excellent lithium supplement material because of its extremely high specific capacity (1550mAh / g). However, its lithium supplement application is stil...

Claims

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Application Information

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IPC IPC(8): C01B25/08C01B32/05H01M4/58H01M4/62H01M10/0525H01M10/42
CPCY02E60/10
Inventor 李仕琦冷丹朱铧丞倪瑞黄澳旗
Owner HANGZHOU DIANZI UNIV
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