Silicon monoxide composite negative electrode material and preparation method thereof

A technology of silicon oxide and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor charge and discharge cycle performance, low Coulombic efficiency, and low conductivity of negative electrode materials, and achieve improved electrochemical performance , Improve the effect of low conductivity and improve conductivity

Pending Publication Date: 2022-01-07
HUI ZHOU BTR NEW MATERIAL TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] However, the silicon oxide negative electrode material is prone to irreversible side reactions during the first lithium intercalation process, resulting in low initial Coulombic efficiency; in addition, silicon oxide has low intrinsic conductivity, and has a certain volume expansion during the charging and discharging process, making the The capacity of the material decays quickly, resulting in poor charge-discharge cycle performance of the negative electrode material

Method used

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  • Silicon monoxide composite negative electrode material and preparation method thereof
  • Silicon monoxide composite negative electrode material and preparation method thereof
  • Silicon monoxide composite negative electrode material and preparation method thereof

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[0046] The present application also provides a method for preparing a silicon oxide composite negative electrode material as described in any one of the above embodiments, comprising the following steps: performing the first stirring and mixing operation of silicon oxide and Si-B alloy powder to obtain a silicon mixture; The silicon mixture is mixed with a solvent by ball milling to obtain a silicon oxide composite slurry; a conductive carbon material and a coated carbon source are added to the silicon oxide composite slurry, and a second stirring and mixing operation is performed to obtain a composite negative electrode slurry; performing a spray drying operation on the composite negative electrode slurry to obtain a composite negative electrode material precursor; performing a pyrolysis operation on the composite negative electrode material precursor to obtain the silicon oxide composite negative electrode material.

[0047] In the preparation method of the above silicon oxid...

Embodiment 1

[0073] Add 5% Si-B alloy powder to silicon oxide, wherein the B content in Si-B alloy is 0.3%, and mix evenly; add the mixture to ethanol solution, wherein the weight ratio of the mixture to ethanol is 1:5 , added to a sand mill, and ball milled by a sand mill to obtain a silicon oxide mixed slurry; add 1.5% carbon nanotubes and 10% PVA to the mixed slurry, and stir evenly; spray-dry the mixed slurry to obtain a composite negative electrode material For the precursor, the inlet temperature of the spray drying is 180°C, and the outlet temperature is 80°C; the precursor is placed in a pyrolysis furnace at a temperature of 800°C under an argon protective atmosphere for 2 hours, and cooled to room temperature to obtain silicon oxide Composite anode materials.

Embodiment 2

[0075]Add 10% Si-B alloy powder to silicon oxide, wherein the B content in Si-B alloy is 0.5%, and mix evenly; add the mixture to ethanol solution, wherein the weight ratio of the mixture to ethanol is 1:4 , added to a sand mill, and ball milled by a sand mill to obtain a silicon oxide mixed slurry; add 2% carbon nanotubes and 10% SBR to the mixed slurry, and stir evenly; spray-dry the mixed slurry to obtain a composite negative electrode material For the precursor, the inlet temperature of spray drying is 200°C, and the outlet temperature is 90°C; the precursor is placed in a pyrolysis furnace at a temperature of 850°C under an argon protective atmosphere for 2 hours, and cooled to room temperature to obtain silicon oxide Composite anode materials.

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Abstract

The invention provides a silicon monoxide composite negative electrode material and a preparation method thereof. The silicon monoxide composite negative electrode material comprises silicon monoxide, Si-B alloy, a conductive carbon layer and a carbon coating layer. The silicon monoxide composite negative electrode material is relatively high in first coulombic efficiency and relatively large in specific capacity, and the electrical property of the negative electrode material can be improved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a silicon oxide composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in new energy vehicles, energy storage, and portable electronic devices due to their high energy density and long cycle life. Due to the low theoretical capacity of the graphite anode material mainly used at present, it cannot meet the higher specific energy demand of lithium-ion power batteries. Due to its suitable working potential and high theoretical capacity, silicon oxide is considered to be one of the most promising anode materials for next-generation lithium-ion batteries. [0003] However, the silicon oxide negative electrode material is prone to irreversible side reactions during the first lithium intercalation process, resulting in low initial Coulombic efficiency; in addition, silicon oxide has low int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 田立斌王培初刘安卿邓明华娄国胜
Owner HUI ZHOU BTR NEW MATERIAL TECH
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