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A GaP @ C composite material, a preparation method thereof and an application in a lithium battery negative electrode

A composite material and xylene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory material cycle performance, inability to adapt to large-scale production, and poor electrochemical performance of electrodes, etc., to achieve excellent electrical performance Chemical properties and cycle stability performance, enhanced electrochemical efficiency, high density and stability effects

Active Publication Date: 2019-01-18
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, for pure metal phosphide materials, although they have high lithium storage capacity, as negative electrode active materials, during the charge and discharge cycle of lithium ion batteries, repeated lithium deintercalation tends to cause the electrode volume expansion to gradually pulverize and fail. The electrochemical performance of the electrode is deteriorated and the capacity is reduced
[0003] Patent 107317008 A discloses a preparation method and process of a core-shell carbon-coated metal phosphide nanocomposite particle. The in-situ synthesized carbon-coated metal nano-particle is used as a precursor, and the carbon-coated metal is obtained through a low-temperature phosphating process. Phosphide nanocomposite particles improve cycle stability, but its cumbersome synthesis method is not conducive to reducing costs, so it cannot meet the needs of large-scale production, and in non-aqueous electrolyte lithium-ion batteries, at a current density of 300mA / g, 15 After the second cycle, the discharge capacity is only 60.7% of the initial discharge capacity, and the cycle performance of the material is still unsatisfactory.

Method used

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  • A GaP @ C composite material, a preparation method thereof and an application in a lithium battery negative electrode
  • A GaP @ C composite material, a preparation method thereof and an application in a lithium battery negative electrode
  • A GaP @ C composite material, a preparation method thereof and an application in a lithium battery negative electrode

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Experimental program
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Effect test

Embodiment 1

[0019] A method for preparing a GaP@C composite material, comprising the following steps: using a planetary ball mill to grind gallium phosphide GaP into powder, the ball milling environment is an argon atmosphere, the mill speed is 300 rpm (rev / min), and the ball milling time is For 2 hours, put 0.1g GaP powder in a tube furnace, heat it to 900°C, and heat it for 1 hour in an argon atmosphere carrying xylene (the mass concentration of xylene is 0.1mg / mL), and carry two The argon flow rate of toluene was 10 mL / min. The tube furnace used was purchased from Hefei Kejing Material Technology Co., Ltd., and the product model is OTF-1200X-100 open vacuum tube furnace (outer diameter 100 × inner diameter 94 × length 1000 mm).

[0020] Cyclic voltammetry test method: The cyclic voltammetry (CV) test was carried out on a CHI640D electrochemical workstation, using a three-electrode battery for testing, and the reference electrode was a circular lithium sheet with an outer diameter of 24...

Embodiment 2

[0029] A method for preparing a GaP@C composite material, comprising the following steps: using a planetary ball mill to grind gallium phosphide GaP into powder, the ball milling environment is an argon atmosphere, the mill speed is 300 rpm (rev / min), and the ball milling time is For 2 hours, put 0.1g of GaP powder in a tube furnace, heat it to 900°C, and heat it for 1 hour in an argon atmosphere carrying methane (the mass concentration of methane is 0.1mg / mL). The gas flow rate was 10 mL / min.

[0030]For the GaP@C composite material prepared in this example, when the current density is 0.5A / g, the first discharge capacity of GaP@C is 1269.1mAh / g, the first charge capacity is 1081.2mAh / g, and the first Coulombic efficiency is 85.1%. From the second cycle, the Coulombic efficiency rises to over 95%. After 100 cycles, GaP@C can only release a specific capacity of 533.7mAh / g, which is attributed to the composite material formed by the small molecule gas carbon source and the two ...

Embodiment 3

[0032] A method for preparing a GaP@C composite material, comprising the following steps: using a planetary ball mill to grind gallium phosphide GaP into powder, the ball milling environment is an argon atmosphere, the mill speed is 300 rpm (rev / min), and the ball milling time is For 2 hours, put 0.1g GaP powder and 20mg liquid xylene (through the comparative analysis of different carbon source additions, the best electrochemical performance is achieved when the xylene is 20mg) in a closed tube furnace with an argon atmosphere, and heat Heat treatment at 900°C for 1 hour in an argon atmosphere.

[0033] For the GaP@C composite material prepared in this example, when the current density is 0.5A / g, the first discharge capacity of GaP@C is 1371mAh / g, the first charge capacity is 1191.3mAh / g, and the first Coulombic efficiency is 86.9%. The Coulombic efficiency rose to over 97% at the beginning of the second cycle. After 100 cycles, GaP@C could only release a specific capacity of ...

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Abstract

The invention discloses a GaP @ C composite material, a preparation method thereof and an application in a negative electrode of a lithium battery. The preparation method of GaP @ C composite materialcomprises the following steps: grinding GaP into powder, placing GaP powder in a tube furnace, heating to 850-950 DEG C, heat treating in an argon atmosphere with xylene for 0.5-2 hours, and the argon gas flow rate with xylene is 9-11 mL / min. By controlling the reaction conditions and the airborne carbon source, The particle size of the prepared GaP @ C composite is 50-500nm, A carbon-coated structure of about 10 nm thick was formed on the surface of GaP particles, At that particle size and the thickness, the synergistic action of the carbon coat structure and the gallium phosphide can not only improve the electronic conductivity of the material, but also restrain the volume effect of the gallium phosphide in the charging and discharge proces, so that the composite material can obtain more excellent cycle stability, and the preparation method is simple and practical, and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy materials, and in particular relates to a GaP@C composite material, a preparation method thereof, and an application in a negative electrode of a lithium battery. Background technique [0002] Facing the vigorous development of new energy technology, the continuous upgrading of electric energy storage technology and equipment has become an inevitable trend of social development. Lithium-ion batteries have become the preferred power source for various electronic products due to their high operating voltage, high energy density (light weight), no memory effect, long cycle life, and no pollution. They are widely used in mobile phones, electric vehicles, and energy storage. and other fields. The electrode material is the core of the lithium-ion battery system, and the negative electrode material is an important factor to improve the energy and cycle life of the lithium-ion battery. Ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5805H01M4/583H01M10/0525Y02E60/10
Inventor 马晶晶鹿志卿郝孟飞
Owner HENAN INST OF SCI & TECH
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