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Preparation method of silicon monoxide composite negative electrode material and product thereof

A silicon oxide, negative electrode material technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of Li loss of activity, affecting practical application, low first charge and discharge efficiency, etc., to avoid falling off and pulverization, The effect of improving coulombic efficiency

Active Publication Date: 2020-12-15
云南锂宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon oxide materials will generate Li in the process of intercalating lithium. 2 O and Li 4 SiO 4 and other inactive products, which lead to the loss of activity of some Li, resulting in low initial charge and discharge efficiency (<70%), which seriously affects its practical application.

Method used

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  • Preparation method of silicon monoxide composite negative electrode material and product thereof
  • Preparation method of silicon monoxide composite negative electrode material and product thereof
  • Preparation method of silicon monoxide composite negative electrode material and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Weigh the high-purity silicon element and high-purity silicon dioxide according to the molar ratio of 1:1, sand-mill in absolute ethanol at a speed of 2400r / min for 2 hours, dry at 90°C to remove ethanol, and sieve to obtain a uniform texture High-purity silicon simple substance and high-purity silica mixture precursor. Put the mixture precursor in a high-temperature tube furnace, under the protection of inert gas, fill the cavity with inert protective gas, keep the normal pressure of the pressure gauge constant, raise the temperature at a rate of 5 °C / min, raise the temperature to 1400 °C, and keep for 8 hours. After the reaction is complete, silicon oxide is generated, and then the temperature is raised to 1600°C at a rate of 5°C / min, the inert gas valve switch is turned on, the gas flow rate is controlled at 60L / h, and the mixed gas of inert gas and silicon oxide is delivered to the initial temperature In a chemical vapor deposition furnace with a temperature of 1500...

Embodiment 2

[0068] The high-purity silicon and high-purity silicon dioxide are weighed according to the molar ratio of 2:1, sand-milled in absolute ethanol at a speed of 2200r / min for 2 hours, dried at 90°C to remove ethanol, and sieved to obtain the texture Uniform high-purity silicon simple substance and high-purity silica mixture precursor. Put the mixture precursor in a high-temperature tube furnace, under the protection of inert gas, fill the cavity with inert protective gas, keep the normal pressure of the pressure gauge constant, raise the temperature at a rate of 10 °C / min, and raise the temperature to 1300 °C for 4 hours. After the reaction is complete, silicon oxide is generated, then the temperature is raised to 1600 °C at a rate of 5 °C / min, the gas valve is turned on, the gas flow rate is 60 L / h, and the mixed gas of inert gas and silicon oxide is transported to an initial temperature of 1350 °C , In a chemical vapor deposition furnace in a vacuum state, the porous graphite p...

Embodiment 3

[0070] The high-purity silicon and high-purity silicon dioxide are weighed according to the molar ratio of 2:1, sand-milled in absolute ethanol at a speed of 2200r / min for 2 hours, dried at 90°C to remove ethanol, and sieved to obtain the texture Uniform high-purity silicon simple substance and high-purity silica mixture precursor. Put the mixture precursor in a high-temperature tube furnace, under the protection of inert gas, fill the cavity with inert protective gas, keep the normal pressure of the pressure gauge constant, raise the temperature at a rate of 10 °C / min, and raise the temperature to 1300 °C for 4 hours. After the reaction is complete, silicon oxide is generated, then the temperature is raised to 1600 °C at a rate of 5 °C / min, the gas valve is turned on, the gas flow rate is 60 L / h, and the mixed gas of inert gas and silicon oxide is transported to an initial temperature of 1200 °C , In a chemical vapor deposition furnace in a vacuum state, with the porous graph...

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Abstract

The invention discloses a preparation method of a silicon monoxide composite negative electrode material, which comprises the following steps: by using elemental silicon and silicon dioxide as initialraw materials, carrying out a neutralization reaction to generate silicon monoxide; vaporizing silicon monoxide, introducing the vaporized silicon monoxide into a chemical vapor deposition furnace filled with a carbon material, and carrying out chemical vapor deposition to obtain a primary product; and finally, carrying out carbon coating to obtain the silicon monoxide composite negative electrode material. The prepared composite negative electrode material has a sandwich type sandwich structure, a carbon material is taken as a core, the outer surface of the carbon material is uniformly coated with silicon monoxide, and the outermost layer is coated with a uniform carbon layer. The lithium ion battery assembled by the composite negative electrode material has relatively high capacity andrelatively good cycling stability, and particularly has ultrahigh initial coulombic efficiency, and the highest initial coulombic efficiency can reach 90%.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium batteries, in particular to a method for preparing a silicon oxide composite negative electrode material and a product thereof. Background technique [0002] With the vigorous development of the new energy automobile industry, higher requirements are put forward for energy storage devices such as lithium batteries. Batteries are the power source of automobiles, and their safety performance, battery life, and cycle stability are all related to the negative electrode of lithium batteries. Materials are closely related, so it is particularly important to prepare lithium battery anode materials with more excellent performance. However, the current state-of-the-art lithium-ion batteries cannot meet the growing demands of electric vehicles and large-scale energy batteries. Silicon is considered the most promising candidate to replace graphite. It is the second most abundant elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 张亚光王振
Owner 云南锂宸新材料科技有限公司
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