Silicon-based negative electrode composite material and preparation method thereof

A silicon-based negative electrode and composite material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of increasing process steps and process costs, and achieve the effect of improving cycle stability, stable structure, and simple process

Inactive Publication Date: 2019-04-12
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method needs to introduce an additional layer of sacrificial layer in the preparation process, and finally remove it, which greatly increases the process steps and process cost

Method used

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  • Silicon-based negative electrode composite material and preparation method thereof
  • Silicon-based negative electrode composite material and preparation method thereof
  • Silicon-based negative electrode composite material and preparation method thereof

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preparation example Construction

[0043] A method for preparing a silicon-based negative electrode composite material provided in an embodiment of the present invention includes the following steps:

[0044] Step 1: taking the silicon-based material 1 and the metal oxide, and uniformly mixing the silicon-based material 1 and the metal oxide through a high-energy ball milling process to obtain a mixture;

[0045] Step 2: calcining the mixture under the condition of an inert atmosphere, so that the surface of the silicon-based material 1 is coated with an initial metal oxide layer;

[0046] Step 3: Depositing a graphene layer 3 on the surface of the initial metal oxide layer by chemical vapor deposition, so that the surface of the silicon-based material 1 is sequentially coated with the initial metal oxide layer and the graphene layer 3, and the graphite The surface of the vinyl layer 3 has a first hole 31 to obtain an initial silicon-based negative electrode composite material;

[0047] Step 4: Put the initial...

Embodiment 1

[0060] A method for preparing a silicon-based negative electrode composite material, comprising the following steps:

[0061] Step 1: Take ferrosilicon alloy and iron oxide, wherein the mass ratio of ferrosilicon alloy and iron oxide is 1:0.2. After mixing the ferrosilicon alloy with iron oxide, it is placed in a high-energy ball mill. The rotational speed was 1000 rpm, and the ball milling time was 3 hours to obtain a mixture.

[0062] Step 2: The mixture was calcined in an inert environment of argon, wherein the temperature was raised from room temperature to 400° C. at a rate of 1° C. / min, and the calcination time was 6 h. Cool to room temperature after calcination, so that the surface of the ferrosilicon alloy is coated with an initial iron oxide layer.

[0063] Step 3: Put the ferrosilicon alloy coated with the initial iron oxide layer on the surface for sintering in an atmosphere furnace, feed methanol, water vapor and inert gases nitrogen and argon, and the volume fra...

Embodiment 2

[0066] A method for preparing a silicon-based negative electrode composite material, comprising the following steps:

[0067] Step 1: Take silicon and nickel oxide, wherein the mass ratio of silicon and nickel oxide is 1-3. After silicon and nickel oxide are mixed, they are placed in a high energy ball mill. The rotational speed was 1500 rpm, and the ball milling time was 1 h to obtain a mixture.

[0068] Step 2: The mixture was calcined in an inert environment of nitrogen, wherein the temperature was raised from room temperature to 700° C. at a rate of 5° C. / min, and the calcination time was 2 h. Cool to room temperature after calcination, so that the silicon surface is coated with a nickel oxide layer.

[0069] Step 3: The silicon coated with the initial nickel oxide layer on the surface is sintered in an atmosphere furnace, and methanol, water vapor, and inert gas nitrogen and argon are introduced, and the volume fractions of methanol and water vapor introduced are 90% an...

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Abstract

The invention provides a silicon-based negative electrode composite material. The silicon-based negative electrode composite material comprises a silicon-based material, a metal oxide layer and a graphene layer, wherein the metal oxide layer wraps the surface of the silicon-based material, and the graphene layer is arranged outside the metal oxide layer; the surface of the graphene layer is provided with a first hole; and a cavity structure is formed between the metal oxide layer and the graphene layer. The cavity structure is formed between the metal oxide layer and the graphene layer; according to the silicon-based negative electrode composite material provided by the invention, by virtue of the cavity structure, a wide space is provided for volume expansion of the silicon-based materialin the charging and discharging process, so that the cycling stability of the silicon-based negative electrode composite material is improved. The invention further provides a preparation method of the silicon-based negative electrode composite material, wherein an acid solution is in contact with the initial metal oxide layer through the first hole in the surface of the graphene, and the part ofthe initial metal oxide layer is corroded off, so that the cavity structure is prepared. The preparation method provided by the invention is simple in process and low in process cost.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a silicon-based negative electrode composite material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries mainly use graphite as the negative electrode material. The large layered voids of graphite-based negative electrode materials provide a place for lithium storage, but at the same time, the layered structure also determines the low theoretical specific capacity of the material. Silicon-based materials are ideal materials for anode materials in lithium-ion batteries due to their high specific capacity. However, there is a large volume effect (the volume expansion rate can be as high as 300%) in the process of intercalation and deintercalation of lithium ions, which leads to a sharp drop in the cycle stability of lithium batteries due to the pulverization and shedding of sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/0525C01B32/182
CPCC01B32/182H01M4/366H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 尚伟丽孔令涌陈彩凤羊启发任望保
Owner SHENZHEN DYNANONIC
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