A kind of high compacted silicon carbon composite negative electrode material and its preparation and application

A silicon-carbon composite material and silicon-carbon composite technology, which are applied in the preparation/purification of carbon, silicon compounds, silicon oxide, etc., can solve the problem of difficult to control oxygen content, weak interface bonding, low compaction density of silicon-carbon composite materials, etc. problems, to maintain structural integrity, improve electrochemical performance, improve cycle stability and first-time efficiency

Active Publication Date: 2022-01-04
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art and improving the problems that the oxygen content in the silicon material is difficult to control, the compaction density of the silicon-carbon composite material is low, and the interface is not firmly bonded, the first purpose of the present invention is to provide a low-oxygen porous silicon-based Silicon-carbon composite negative electrode active materials, aiming to improve electrochemical performance such as cycle stability, first Coulombic efficiency, and rate performance

Method used

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  • A kind of high compacted silicon carbon composite negative electrode material and its preparation and application
  • A kind of high compacted silicon carbon composite negative electrode material and its preparation and application

Examples

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Embodiment 1

[0095] Using SiO coarse powder with an average particle size of 0.5 mm as raw material, after crushing and crushing, SiO fine powder with an average particle size of 1 μm is obtained; chemical vapor deposition method is used, acetylene is used as raw material gas, argon is used as carrier gas, and the deposition temperature is at 650°C, holding time 1h, gas flow rate of acetylene 120ml / min, argon 40ml / min, coating a thin carbon layer on the surface of SiO fine powder to obtain silicon monoxide particles (SiO@C) wrapped in a thin layer of carbon; SiO @C particles, metallic Mg, non-metallic B powder, mixed salt (LiCl:NaCl molar ratio 7:3, eutectic point 570°C) were mixed and granulated by extrusion granulation according to the mass ratio of 1:0.2:0.05:1 pellets to obtain a composite precursor; put the composite precursor into a sintering boat and place it in a muffle furnace for sintering reaction under an argon atmosphere, and heat up to 700°C at a speed of 5°C / min, react for 6 ...

Embodiment 2

[0100] Mix the low-oxygen porous silicon prepared in Example 1, artificial graphite powder with a particle size of 6 μm, pitch with a particle size of 3 μm, and toluene in a mass ratio of 1:0.5:0.08:4 and mix them uniformly in a high-speed disperser, then Spray granulation was performed to obtain a silicon-carbon precursor; the silicon-carbon precursor was placed in a cauldron and subjected to carbonization heat treatment at 950° C. for 2 hours under an argon atmosphere. After cooling, disperse with a jet mill to obtain a silicon-carbon intermediate with an average particle size of 13 μm; carry out particle size grading with artificial graphite with a particle size of 20 μm in a mass ratio of 1:1 to obtain the high-compact silicon-carbon composite negative electrode material .

[0101] The silicon carbon negative plate was assembled into a CR2032 lithium-ion button battery, and the electrochemical performance was tested in the voltage range of 0.01-2V at room temperature, and ...

Embodiment 3

[0103] Mix the low-oxygen porous silicon prepared in Example 1, artificial graphite powder with a particle size of 2 μm, phenolic resin with a particle size of 1 μm, and acetone at a mass ratio of 1:2:0.2:8 and mix them uniformly in a high-speed disperser. Then spray granulation was carried out to obtain the silicon-carbon precursor; the silicon-carbon precursor was placed in a cauldron and subjected to carbonization heat treatment at 800° C. for 4 hours under an argon atmosphere. After cooling, disperse with a jet mill to obtain a silicon-carbon intermediate with an average particle size of 8 μm; carry out particle size grading with artificial graphite with a particle size of 15 μm in a mass ratio of 1:1 to obtain the high-pressure compacted silicon-carbon composite negative electrode material .

[0104] The silicon carbon negative plate was assembled into a CR2032 lithium-ion button battery, and the electrochemical performance was tested in the voltage range of 0.01-2V at ro...

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Abstract

The invention belongs to the field of preparation of silicon-carbon negative electrode materials, and specifically discloses a silicon-carbon composite material based on low-oxygen porous silicon, which includes silicon-carbon composite particles and carbon component a; the silicon-carbon composite particles include amorphous carbon Substrate and small-diameter carbon particles b and low-oxygen porous silicon particles compounded in the substrate; the low-oxygen porous silicon particles include a core and a shell compounded on the surface of the core; wherein the core is locally amorphized Low-oxygen porous silicon SiO y ;The shell is a thin carbon coating; where, 0

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode materials, and in particular relates to a high-pressure compacted silicon-carbon composite powder material based on low-oxygen porous silicon and a preparation method thereof. Background technique [0002] Due to its advantages of high theoretical capacity, good safety performance and wide range of sources, silicon is expected to replace graphite materials as the anode material for next-generation high-energy-density lithium-ion batteries. However, the huge volume expansion and low intrinsic conductivity of silicon during the charge-discharge process lead to poor cycle and rate performance of the battery. Silicon monoxide (SiO) can react with lithium ions during the first charge and discharge process to form electrochemically inert Li 2 O and Li 2 SiO 4 , effectively alleviate the volume expansion problem of the active material, and improve the cycle performance of the battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525C01B32/05C01B33/021C01B33/113
CPCC01B32/05C01B33/021C01B33/113H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 周昊宸周向清王鹏周进辉
Owner 湖南宸宇富基新能源科技有限公司
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