A uniformly modified silicon-based composite material and its preparation method and application

A silicon-based composite material and modification technology, applied in the field of materials, can solve problems such as changing surface conductivity, achieve the effect of improving fast charging performance and bulk phase conductivity

Active Publication Date: 2022-04-12
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon coating can only change the surface conductivity. In order to achieve fast charging performance, the conductivity inside the particles also needs to be improved.

Method used

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  • A uniformly modified silicon-based composite material and its preparation method and application
  • A uniformly modified silicon-based composite material and its preparation method and application
  • A uniformly modified silicon-based composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Put 1kg of silicon powder, 1kg of silicon dioxide and 0.3kg of copper oxide mixed powder in a high-temperature reaction furnace, evacuate to 50Pa, and heat up to 1500°C to become steam. 1.6 L of methane was slowly introduced into the mixture under argon flow for 3 hours, and then cooled to room temperature. After discharging and pulverizing, a silicon-based composite material in which internal carbon and copper elements are evenly dispersed at the atomic level can be obtained. The carbon content is 1.5% when tested with a carbon-sulfur analyzer.

[0062] The obtained silicon-based composite material was tested by FIB-TEM, and the distribution of elements inside the particles was observed by energy spectrum detection. image 3 It is a surface scan of FIB-TEM energy spectrum. From figure 2 The energy spectrum element scan shows that the four elements Si, C, Cu and O are evenly distributed in the particles.

[0063] Afterwards, carry out carbon coating on the silicon-...

Embodiment 2

[0067] Put 1kg of silicon powder and 1kg of silicon dioxide mixed powder in a vacuum furnace, evacuate to 50Pa, heat up to 1500°C and turn into steam. Subsequently, 1.6 L of methane was slowly introduced into the mixture under an argon flow for 3 hours, and cooled to room temperature. After the material is discharged and pulverized, the silicon-based material powder in which the internal carbon element is uniformly dispersed at the atomic level is obtained. The carbon content is 1.8% when tested with a carbon-sulfur analyzer.

[0068] Mix the obtained silicon-based material powder with internal carbon uniformly dispersed at the atomic level and copper oxide at a molar ratio of 1:0.4, and then heat-treat at 1000°C for 4 hours to obtain a silicon-based composite containing internal carbon and copper elements. Material.

[0069] The above materials are then carbon coated. Put 2kg of silicon-based composite material in a rotary furnace and raise the temperature to 1000°C under ...

Embodiment 3

[0072] Put 3kg of silicon powder, 3kg of silicon dioxide, and 1kg of boron oxide mixed powder in a vacuum furnace, evacuate to 100Pa, heat up to 1350°C to become a vapor, and slowly feed 23.4L of propane under an argon flow to react8 hours, cooled to room temperature. After the material is discharged and pulverized, the silicon-based composite material in which the internal carbon and boron elements are evenly dispersed at the atomic level can be obtained. The carbon content is 2.0% when tested with a carbon-sulfur analyzer.

[0073] Afterwards, carbon-coated it, put 2kg of material in a rotary furnace, and raised the temperature to 900°C under the protective gas of argon, and introduced argon and a mixed gas of propylene and methane in the same amount as argon at a volume ratio of 1:1. Gas-phase coating was carried out in which the volume ratio of propylene and methane was 2:3. After heat preservation for 3 hours, the organic gas source was turned off, and after the materia...

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Abstract

The invention relates to a uniformly modified silicon-based composite material and its preparation method and application. The general formula of the silicon-based composite material is SiC x A y o z ; 0<x<20; 0<y<10; 0<z<10; wherein, A is among B, Al, Mg, Ca, Fe, Co, Ni, Cu, Zn, Ge, Sn, Li One or more of C, C is uniformly dispersed in the particles of the silicon-based composite material at the atomic scale, and there is no agglomeration of carbon elements above 20nm; some or all of the carbon atoms combine with the silicon atoms to form disordered Si‑C bonds ; In the Focused Ion Beam-Transmission Electron Microscope F I B-TEM test of the silicon-based composite material, the energy spectrum surface scan of the particle cut surface shows that the silicon element, carbon element, A element, and oxygen element are uniformly distributed in the particle; the silicon-based composite material The microstructure is a heterogeneous dispersed structure; the average particle diameter D of the silicon-based composite particles 50 1nm‑100μm, the specific surface area is 0.5m 2 / g‑40m 2 / g; the mass of the carbon atom accounts for 0.1%-40% of the mass of the silicon-based composite material; the mass of the A element accounts for 3%-40% of the mass of the composite particle.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a uniformly modified silicon-based composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of lithium-ion battery applications and the increasing demand for high energy density, the development of electrode materials with high specific capacity has become the current research focus in the field of lithium batteries. As one of the four main materials of lithium-ion batteries, the negative electrode material has a large capacity that affects the energy density of lithium-ion batteries. Silicon and lithium form an alloy at a lower potential and react to form Li 3.75 Si, at this time the specific capacity can reach 3975mAh / g. However, the huge volume change of up to 300% in the process of lithium intercalation and deintercalation of silicon severely limits the application of this material. [0003] Compared wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/052H01M10/0525C01B33/18
CPCH01M4/362H01M4/366H01M4/483H01M4/625H01M4/626H01M10/052H01M10/0525C01B33/18C01P2004/04C01P2006/40C01P2004/64C01P2004/62C01P2004/61C01P2006/12H01M2004/021H01M2004/027Y02E60/10
Inventor 罗飞
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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