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A high-capacity graphite-silicon-silicon-oxide composite material and its preparation method and application

A silicon oxide and composite material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of complex preparation process, achieve the effect of simple preparation method, improve cycle performance, and improve specific capacity and cycle performance

Active Publication Date: 2022-04-19
捷威动力工业嘉兴有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the patent document with the application number 201810565759.2 discloses that the chemical vapor deposition method is used to coat carbon materials on the surface of silicon oxide particles to obtain carbon-coated silicon oxide; configure carbon-coated silicon oxide, soft carbon precursors, and carbon substrates The mixed solution is spray-dried and granulated to obtain the first precursor compound; the first precursor compound is subjected to the first heat treatment to obtain the second precursor compound; the second precursor compound and the carbon The material precursors are mixed to form a silicon-carbon composite precursor, and the silicon-carbon composite precursor is subjected to a second heat treatment to obtain a lithium-ion battery composite silicon negative electrode material; the preparation process is complicated, and the silicon oxide used is undisproportionated silicon oxide silicon

Method used

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  • A high-capacity graphite-silicon-silicon-oxide composite material and its preparation method and application
  • A high-capacity graphite-silicon-silicon-oxide composite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0027] The preparation method of the high-capacity graphite-silicon-silicon oxide composite material of the present embodiment comprises the following steps:

[0028] (1) According to the mass ratio of 1:1:8:0.2, take silicon oxide SiO with a particle size of 5 μm, silicon Si with a particle size of 0.1 μm, graphite and coal tar with a particle size of 10 μm, and add them to the kneader, and raise the temperature to 160°C Stir and knead for 2h to obtain a mixture; wherein the graphite is artificial graphite;

[0029] (2) Transfer the mixture to a box-type furnace, and raise the temperature to 1000°C at a rate of 5°C / min in an inert atmosphere (argon gas is selected), keep it warm for 2 hours, and then cool down naturally to obtain high-capacity graphite - Silicon-silicon oxide composite material, the structure of which is as figure 1 As shown, Si and SiO are uniformly dispersed between graphite and graphite, and the volume expansion effect of Si and SiO can be effectively sup...

Embodiment 2

[0032] The preparation method of the high-capacity graphite-silicon-silicon oxide composite material of the present embodiment comprises the following steps:

[0033] (1) According to the mass ratio of 1:1.5:10:0.6, take silicon oxide SiO with a particle size of 1 μm, silicon Si with a particle size of 0.1 μm, graphite with a diameter of 10 μm, and coal tar, and add them to the kneader, and raise the temperature to 160°C Stir and knead for 2 hours to obtain a mixture; wherein, graphite is artificial graphite; wherein, the larger the particle size of kneading and granulation, the better the cycle performance, but the first effect is reduced, and the secondary particle size can be effectively controlled by controlling the amount of carbon source. diameter, to achieve a good balance between the first effect and cycle performance, thereby improving the overall effect, completing the coating and granulation process in one step while reducing the use of carbon sources; by controlling...

Embodiment 3

[0037] The preparation method of the high-capacity graphite-silicon-silicon oxide composite material of the present embodiment comprises the following steps:

[0038] (1) According to the mass ratio of 1:1.5:10:0.6, take silicon oxide SiO with a particle size of 0.5 μm, silicon Si with a particle size of 0.2 μm, graphite and coal tar with a particle size of 10 μm, add them to the kneader, and raise the temperature to 200 ℃ stirring and kneading for 3 hours to obtain a mixture; wherein the graphite is artificial graphite;

[0039] (2) Transfer the mixture to a box-type furnace, and raise the temperature to 900°C at a rate of 5°C / min in an inert atmosphere (argon gas is selected), keep it warm for 2 hours, and then cool down naturally to obtain high-capacity graphite -Silicon-silicon oxide composite material, its structure can refer to Example 1.

[0040] The graphite-silicon-silicon oxide composite material in this embodiment can be used as a lithium battery negative electrode...

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Abstract

The invention belongs to the technical field of negative electrode materials for lithium batteries, and in particular relates to a preparation method of a high-capacity graphite-silicon-silicon oxide composite material, comprising the following steps: (1) adding silicon, silicon oxide, graphite, and a carbon source to the kneading Stirring and kneading by raising the temperature in the machine to obtain a mixture; (2) calcining the mixture in an inert atmosphere, cooling after calcining to obtain a graphite-silicon-silicon oxide composite material. In the present invention, Si and SiO are coated with carbon source and bonded with graphite at the same time. The viscosity and relatively high dispersion of carbon source improve the dispersion performance of Si, SiO and graphite in the composite material, so that Si, SiO and graphite Form a uniform dispersion effect. After high-temperature carbonization, Si and SiO are firmly bonded in the graphite interlayer through residual carbon, effectively inhibiting the volume expansion effect of Si and SiO, and improving the specific capacity and cycle performance of electrode materials. Simultaneous one-step method Coating also greatly reduces the overall carbon source usage.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium batteries, and in particular relates to a high-capacity graphite-silicon-silicon oxide composite material and a preparation method and application thereof. Background technique [0002] The negative electrode material of a lithium battery is one of the key factors that determine the performance of the lithium battery such as charge and discharge efficiency and cycle life. At present, commercial lithium batteries mainly use graphite as the negative electrode material. The specific capacity of high-end graphite materials on the market has reached 360-365mAh / g, which is close to the theoretical specific capacity of graphite of 372mAh / g. Therefore, lithium batteries using graphite as the negative electrode material The improvement space of energy density is limited, which cannot meet the requirement of high energy density of power battery. [0003] Silicon Si has beco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M10/052
CPCH01M4/362H01M4/386H01M4/483H01M4/583H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 单沈桃王科技魏文明苏岩
Owner 捷威动力工业嘉兴有限公司