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Carbon-silicon negative electrode material, preparation method thereof and application of carbon-silicon negative electrode material in lithium ion battery

A negative electrode material, carbon silicon technology, which is applied in the field of carbon silicon negative electrode material and its preparation, can solve the problems of slowing lithium ion transmission and lack of pore structure, and achieves superior battery capacity and stability, low cost and optimized performance. Effect

Active Publication Date: 2021-10-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary coated carbon does not have a good pore structure, which slows down the transport of lithium ions while suppressing the volume expansion of Si.

Method used

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  • Carbon-silicon negative electrode material, preparation method thereof and application of carbon-silicon negative electrode material in lithium ion battery
  • Carbon-silicon negative electrode material, preparation method thereof and application of carbon-silicon negative electrode material in lithium ion battery
  • Carbon-silicon negative electrode material, preparation method thereof and application of carbon-silicon negative electrode material in lithium ion battery

Examples

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Embodiment approach

[0046] The third embodiment of the present invention provides an application of the above-mentioned carbon-silicon negative electrode material in a lithium-ion battery.

[0047] The fourth embodiment of the present invention provides a battery negative electrode, including an active material, a conductive material and a binder, and the active material is the above-mentioned carbon silicon negative electrode material.

[0048] In some examples of this embodiment, the conductive material is acetylene black.

[0049] In some examples of this embodiment, the binder is polyvinylidene fluoride (PVDF).

[0050] In some examples of this embodiment, the mass ratio of the active material, the conductive material and the binder is 6-8:1.6-2.4:0.6-1.4.

[0051] A fifth embodiment of the present invention provides a lithium-ion battery, including a positive electrode, a separator, an electrolyte, and the above-mentioned negative electrode of the battery.

[0052] In some examples of this...

Embodiment 1

[0056] A method for preparing a carbon-silicon negative electrode material for a lithium ion battery, the steps are as follows:

[0057] (1) Weigh 0.5g of silicon powder with a diameter of about 50nm, 2g of PVP, dissolve in 1L of deionized water, disperse evenly by ultrasonication for 15min, and stir for 24h. Centrifuge, wash with water and ethanol, disperse into 50ml ethanol for calibration, and obtain PVP-modified Si particles.

[0058] (2) Weigh 160mg of 2-methylimidazole and 60mg of zinc nitrate and dissolve them in 10mL of ethanol solution respectively. Measure the Si@PVP solution containing 10 mg Si@PVP. Mix Si@PVP solution and 2-methylimidazole solution evenly, add zinc nitrate solution under stirring condition, stir at room temperature for 24 hours, centrifuge, wash with ethanol three times, and freeze dry to obtain Si@ZIF-8.

[0059] (3) Dissolve 50mg of Si@ZIF-8 and 8.8mg of MXene in water, respectively, at a concentration of 1mg / mL. Mix the two solutions under sti...

Embodiment 2

[0066] This example is basically the same as Example 1, except that the quality of PVP in step (1) is 1 mg.

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Abstract

The invention discloses a carbon-silicon negative electrode material, a preparation method thereof and an application of the carbon-silicon negative electrode material in a lithium ion battery. The preparation method comprises the steps of preparing ZIF-8 in a dispersion liquid of silicon, enabling the ZIF-8 to coat silicon to obtain Si@ZIF-8, compounding the Si@ZIF-8 and MXene in a solution to obtain Si@ZIF-8 / MXene, and carbonizing the Si@ZIF-8 / MXene to obtain silicon@carbon / MXene, namely, the carbon-silicon negative electrode material, wherein the dispersion liquid of the silicon contains polyvinylpyrrolidone. According to the invention, the silicon material can be coated with carbon, and the carbon-coated silicon material is compounded with MXene, so that the prepared carbon-silicon negative electrode material has good electrochemical performance.

Description

technical field [0001] The invention belongs to the field of negative electrode materials of lithium ion batteries, and relates to a carbon silicon negative electrode material, a preparation method thereof and an application in lithium ion batteries. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-ion batteries have become the most common electrochemical energy storage devices due to their excellent stability and energy density. However, in recent years, the energy density of lithium-ion batteries cannot meet our needs, mainly due to the lack of commercial graphite anodes. The theoretical specific capacity is low (372mAh / g). Therefore, finding an anode material w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 王儒涛赵涵张树贤李崇兴李桐
Owner SHANDONG UNIV