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Silicon-oxygen negative electrode material with mixed crystal phase as well as preparation method and application of silicon-oxygen negative electrode material

A technology of mixing crystal phases and negative electrode materials, which is applied in the field of materials, can solve the problems of insignificant performance advantages of material products, complex processes that cannot be mass-produced, and high equipment difficulty, so as to improve the depth of solid-phase reaction and the relative strength of SiO2 and silicate crystals. Effects of swelling reduction and high rate performance

Active Publication Date: 2021-11-02
溧阳紫宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the gas phase process route, the equipment is difficult and the production capacity is relatively low
In other words, most of the existing process routes have disadvantages such as not obvious advantages in material product performance, high prices, and too complicated processes for mass production.

Method used

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  • Silicon-oxygen negative electrode material with mixed crystal phase as well as preparation method and application of silicon-oxygen negative electrode material
  • Silicon-oxygen negative electrode material with mixed crystal phase as well as preparation method and application of silicon-oxygen negative electrode material
  • Silicon-oxygen negative electrode material with mixed crystal phase as well as preparation method and application of silicon-oxygen negative electrode material

Examples

Experimental program
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preparation example Construction

[0031] Embodiments of the present invention provide a silicon-oxygen negative electrode material with a mixed crystal phase and a preparation method thereof. The main steps of the preparation method of the material are as follows: figure 1 shown, including:

[0032] Step 110, Si, SiO 2 Mix with the reducing metal in proportion, put it into the material crushing equipment, and carry out material crushing and mixing under the condition of inert atmosphere, so that Si, SiO 2 The phases of the three materials with the reducing metal are broken to a certain extent and mixed uniformly;

[0033] Wherein, the reducing metal includes: one of lithium, sodium, magnesium, aluminum, potassium, and copper; the reducing metal accounts for 0.5%-15% of the total weight of the silicon-oxygen negative electrode material, preferably 1%-12%, More preferably 3%-9%.

[0034] Si is silicon powder, particle size D50=3μm-15μm; SiO 2 It is silica powder, particle size D50=1 μm-10 μm; the mass ratio ...

Embodiment 1

[0052] This example is used to prepare a silicon-oxygen negative electrode material with a mixed crystal phase.

[0053] Mix 50g D50=8μm Si powder and 100g D50=3μm SiO 2 The powder was put into a high-energy ball mill, and ball milled at 600rpm / min for 20 hours under an argon atmosphere;

[0054] Add 20g of 100 mesh Mg powder, and ball mill at 200rpm / min for 1 hour;

[0055] Add 2.5g CNTs, 100rpm / min ball mill for 15min;

[0056] Add 10g of asphalt into the high-energy ball mill tank, and ball mill at 200rpm / min for 15min;

[0057] After the materials are mixed evenly, put them into a corundum crucible, transfer them to a tube furnace, heat up to 900°C for sintering for 8 hours under an argon atmosphere, and take out the prepared powder samples;

[0058] A layer of polypyrrole (ppy) conductive polymer accounting for 1.5 wt% of the total weight of the silicon-oxygen negative electrode material is coated by an in-situ polymerization method to obtain the final finished silicon...

Embodiment 2

[0062] This example is used to prepare a silicon-oxygen negative electrode material with a mixed crystal phase.

[0063] 65g D50=6μm Si powder and 162g D50=4μm SiO 2 The powder was put into a high-energy ball mill, and ball milled at 800 rpm / min for 15 hours under an argon atmosphere;

[0064] Add 20g of 100 mesh Cu powder, and ball mill at 150rpm / min for 1 hour;

[0065] Add 2.5g CNTs and 2.5g VGCF, 100rpm / min ball mill for 30 minutes;

[0066] Add 8g of phenolic resin into the high-energy ball mill tank, and ball mill at 200rpm / min for 15min;

[0067] After the materials are mixed evenly, put them into a corundum crucible, transfer them to a tube furnace, heat up to 800°C for sintering for 10 hours under an argon atmosphere, and take out the prepared powder samples;

[0068] A layer of polypyrrole (ppy) conductive polymer accounting for 2.0 wt% of the total weight of the silicon-oxygen negative electrode material is coated by an in-situ polymerization method to obtain the...

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Abstract

The invention relates to a silicon-oxygen negative electrode material with a mixed crystal phase as well as a preparation method and application of the silicon-oxygen negative electrode material. The preparation method comprises the following steps: mixing Si, SiO2 and reducing metal in proportion, putting into material crushing equipment, and crushing and mixing under an inert atmosphere condition, so that three material phases of the Si, the SiO2 and the reducing metal are crushed to a certain extent; adding a conductive agent in proportion, and continuously crushing and mixing under the inert atmosphere condition; adding a solid-phase coating material, and forming a coating structure material in a solid-phase coating granulation mode; putting the coating structure material into heat treatment equipment, sintering under an inert atmosphere condition, and carrying out reduction treatment on the coating material to form a mixed crystal phase material which has three crystal phases of Si, SiO2 and silicate of reducing metal and has a phase structure in which the conductive agent is uniformly dispersed; and adding a conductive polymer monomer, and forming a conductive polymer coating layer on the surface of the mixed crystal phase material under the condition of an initiator, thereby obtaining the silicon-oxygen negative electrode material with the mixed crystal phase.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a silicon-oxygen negative electrode material with a mixed crystal phase, a preparation method and application thereof. Background technique [0002] As global warming becomes more and more serious, domestic and foreign efforts to "zero emission" and "carbon neutrality" of carbon dioxide are gradually intensified, and the new energy lithium battery industry has also entered the public's field of vision. Materials and other related developments have also entered a stage of rapid development. [0003] As one of the four main materials in the lithium battery industry, the anode material is also the focus of development. The capacity of commercial graphite (372mAh / g) materials has basically reached the upper limit, and it is difficult to make a major breakthrough, which limits the current materials to a certain extent. At this time, silicon-oxygen anode materials have the advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/624H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 周勇岐李辉刘芳顾华清毕文君
Owner 溧阳紫宸新材料科技有限公司
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