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A kind of silicon/carbon powder composite material and its preparation method and battery negative electrode material

A composite material and carbon powder technology, applied in the field of battery negative electrode materials and their preparation, can solve the problems of large and non-uniform particle size, poor sphericity of silicon/carbon composite material powder, etc., achieve uniform powder particle size and improve cycle performance , the effect of simple operation

Active Publication Date: 2020-07-31
东莞市鸿德电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the powder sphericity of the silicon / carbon composite material produced by the existing preparation method is poor and the particle size is large and uneven

Method used

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  • A kind of silicon/carbon powder composite material and its preparation method and battery negative electrode material
  • A kind of silicon/carbon powder composite material and its preparation method and battery negative electrode material
  • A kind of silicon/carbon powder composite material and its preparation method and battery negative electrode material

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preparation example Construction

[0021] Such as figure 1 Shown, the preparation method of silicon / carbon powder composite material of the present invention comprises the following steps:

[0022] S1. Melting the silicon under vacuum heating until it reaches a molten state to obtain a silicon melt.

[0023] Specifically, silicon is put into a close-coupled ultrasonic vacuum atomization device, and heated and smelted under vacuum conditions. The melting temperature is preferably 1520-1560 ° C. When it is observed that the silicon is smelted to a molten state, stop heating to obtain silicon Magma. During smelting, more preferably, the degree of vacuum is 0-5Pa. In this step, it is also included to keep the prepared silicon melt, so that the silicon can be fully melted, and avoid the cooling and solidification of the silicon melt ejected from the atomizing nozzle, so that the silicon melt remains in a molten state; The heat preservation time is preferably 25 to 35 minutes.

[0024] Wherein, the silicon conten...

Embodiment 1

[0032] Put 50kg of silicon into the crucible of close-coupled ultrasonic gas atomization equipment, heat and melt the silicon at a temperature of 1520°C under the condition of a vacuum degree of less than 5 Pa, and melt it to a molten state to obtain a silicon melt. And the silicon molten slurry is kept warm for 25 minutes.

[0033] Atomize the silicon melt, choose nitrogen as the carrier gas, and choose acetylene as the carbon source gas; pass the mixed gas of nitrogen and acetylene with a volume ratio of 85:15 into the mixing pipe in the close-coupled ultrasonic gas atomization equipment for mixing ; and the mixed gas pipeline is connected to the atomizing nozzle in the close-coupled ultrasonic gas atomization equipment, the silicon melt is sprayed out through the atomizing nozzle, meets the airflow of the mixed gas, and the inlet pressure of the mixed gas is controlled to be 3.5Mpa, and the acetylene The carbon in the silicon powder is separated and coated on the surface of...

Embodiment 2

[0035] Put 50kg of silicon into the crucible of the close-coupled ultrasonic vacuum atomization equipment, heat and melt the silicon at a temperature of 1540°C under the condition that the vacuum degree is lower than 5pa, and melt it to a molten state to obtain silicon Melt, and heat preservation of the silicon melt, the heat preservation time is 30min.

[0036] Atomize the silicon melt, select nitrogen as the carrier gas, and select methane as the carbon source gas; pass the mixed gas of nitrogen and acetylene with a volume ratio of 85:20 into the mixed gas pipeline in the close-coupled ultrasonic vacuum air atomization equipment Mixing; and the mixed gas pipeline is connected to the atomizing nozzle in the close-coupled ultrasonic vacuum atomization equipment. Once the silicon melt is sprayed out from the atomizing nozzle, it meets the airflow of the mixed gas, and the inlet pressure of the mixed gas is controlled to be 4Mpa. , the carbon in the methane is separated and coat...

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Abstract

The invention relates to a Si / C powder composite material, a preparation method of same, and an anode material of a battery. The preparation method includes the steps of: performing vacuum heating smelting to silicon until molten status, thus producing molten silicon slurry; feeding a gas mixture of an inert gas and a carbon source gas to the molten silicon slurry, and performing tight-coupling ultrasonic vacuum gas atomization to the material to prepare the Si / C powder composite material. The preparation method is simple. The Si / C powder composite material has high degree of sphericity and issmall and uniform in particle size, can solve a problem of structural damage of a material since silicon generates huge size expansion in decarbonization of lithium ions, thereby improving the cycleperformance of the anode material. A lithium ion battery produced with the Si / C powder composite material as the anode material is high in specific capacity and safety.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, to a battery negative electrode material and a preparation method thereof. Background technique [0002] After more than 20 years of development of lithium-ion batteries, the battery manufacturing process has become mature, and it is difficult for lithium-ion batteries using commercial carbon materials as anode materials to make major breakthroughs in energy density. In recent years, among the new battery materials developed, silicon-based anode materials with the advantages of high specific capacity, higher safety, and abundant resources have received widespread attention. At present, silicon and carbon materials are usually combined to form silicon-carbon cores. The shell structure or the compound coated with carbon on the surface of silicon solves the problem of the destruction of the material structure caused by the huge volume expansion of elemental silicon during the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李浩治盛洪超张相同王涌凌剑李尹庆
Owner 东莞市鸿德电池有限公司
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