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Nano-silicon/graphite phase carbon nitride/graphite composite negative electrode material and preparation method thereof

A graphite-phase carbon nitride and negative electrode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of product stability reduction, limited application and promotion, cumbersome process, etc., to achieve Good electrical performance and cycle performance, the effect of broad application prospects

Active Publication Date: 2022-03-04
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also disadvantages such as large volume expansion and poor cycle performance.
The conventional process slows down the volume expansion effect of silicon through thermal coating process and composite carbon material, but the process is cumbersome, and the specific capacity of carbon material is low, resulting in high production cost and reduced product stability, which limits its further application to promote

Method used

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  • Nano-silicon/graphite phase carbon nitride/graphite composite negative electrode material and preparation method thereof
  • Nano-silicon/graphite phase carbon nitride/graphite composite negative electrode material and preparation method thereof
  • Nano-silicon/graphite phase carbon nitride/graphite composite negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) 1g of silicon powder (particle size: 40nm), 5g of urea and 0.2g of naphthalenesulfonate-based sodium naphthalenesulfonate formaldehyde polycondensate were added to 80g of ethanol and uniformly dispersed to obtain slurry 1;

[0047] (2) Add 0.4 g of acetylene black, 17 g of mesocarbon microspheres (particle size 16.5 μm) and 0.3 g of polyetherimide into 80 g of ethanol and disperse evenly to obtain slurry 2;

[0048] (3) Add slurry 1 to slurry 2, then carry out stirring and spray drying, control the inlet temperature of the spray dryer to 250°C, the outlet temperature to 100°C, the frequency of the feeding tray to be 15Hz, and the frequency of the atomizing tray to be 250Hz to obtain Spherical particle precursor;

[0049] (4) adding 0.5% magnesium powder to the gained precursor and mixing;

[0050] (5) The mixture obtained in step (4) was carbonized for 6 hours at 650° C. in a carbonization furnace under an argon atmosphere, and the obtained product was cleaned with d...

Embodiment 2

[0053] (1) Add 1.5g of silicon oxide powder (particle size 150nm), 8g of melamine and 0.2g of calcium lignosulfonate into 90g of ethanol and uniformly disperse to obtain slurry 1;

[0054] (2) Add 0.8g of acetylene black, 16g of artificial graphite (15.0 μm in particle size) and 0.3g of polyetherimide into 90g of ethanol and uniformly disperse to obtain slurry 2;

[0055] (3) Add slurry 1 to slurry 2, and then carry out agitation and spray drying, control the inlet temperature of the spray dryer to 200°C, the outlet temperature to 90°C, the frequency of the feeding tray to be 15Hz, and the frequency of the atomizing tray to be 250Hz to obtain Spherical particle precursor;

[0056] (4) Add 0.1% magnesium powder to the gained precursor and mix;

[0057] (5) The mixture obtained in step (4) was carbonized in a carbonization furnace at 700° C. for 4 hours under an argon atmosphere, and the product obtained was cleaned with dilute hydrochloric acid and deionized water, and dried i...

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Abstract

The invention provides a nano-silicon / graphite phase carbon nitride / graphite composite negative electrode material, which comprises a graphite matrix, nano-silicon particles dispersed in the graphite matrix, and graphite-phase carbon nitride coated on the surface of the nano-silicon particles. Furthermore, the present invention provides a method for preparing a nano-silicon / graphite phase carbon nitride / graphite composite negative electrode material. Using graphitic carbon nitride (g‑C 3 N 4 ) to coat the silicon, effectively inhibit the volume expansion of silicon, and significantly improve its electrical properties and cycle performance.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a nano-silicon / graphite phase carbon nitride / graphite composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have attracted much attention due to their advantages such as high specific energy, high operating voltage, wide temperature range, no pollution, and long storage life. As a green device for high-efficiency electrical energy storage and conversion, lithium-ion batteries are considered to be an ideal power source for small vehicles to truly achieve zero emissions. With the rapid development of portable digital electronic products such as mobile phones and notebook computers and the urgent demand for electric vehicles, the search for lithium-ion batteries with high energy density has become a research hotspot for domestic and foreign scientific and technological workers. [0003] Traditional commercial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/58H01M4/625H01M4/628H01M10/0525B82Y30/00Y02E60/10
Inventor 彭果戈聂鹏茹
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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