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A kind of preparation method of silicon carbon negative electrode material and lithium ion battery

A negative electrode material, silicon carbon technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation methods, poor charge and discharge performance, capacity fading, etc., achieve simple preparation methods, improve cycle performance, and suppress powder effect

Active Publication Date: 2020-05-19
银硅(宁波)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are still many problems to be solved urgently: such as uneven composite with carbon, weak binding force between each other, complex preparation methods, etc.
The silicon-carbon anode material obtained by the prior art has poor cycle performance and poor conductivity
In addition, the pulverization caused by expansion directly leads to rapid capacity decay and poor charge-discharge performance at high rates.

Method used

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  • A kind of preparation method of silicon carbon negative electrode material and lithium ion battery
  • A kind of preparation method of silicon carbon negative electrode material and lithium ion battery
  • A kind of preparation method of silicon carbon negative electrode material and lithium ion battery

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preparation example Construction

[0027] The invention provides a method for preparing a silicon-carbon negative electrode material, comprising:

[0028] A) chemical vapor deposition is carried out to catalyst precursor and carbon source, obtain the catalyst of surface coating graphene layer;

[0029] B) corroding the catalyst surface coated with a graphene layer with an acid, and separating and obtaining a graphene cage material;

[0030] C) the graphene cage material is milled with nano-silicon balls, and dried to obtain the precursor material;

[0031] D) Chemical vapor deposition of the precursor material and the carbon source to obtain the silicon-carbon negative electrode material.

[0032] In the preparation method of the silicon-carbon negative electrode material provided by the present invention, first, the catalyst precursor and the carbon source are subjected to chemical vapor deposition to obtain a catalyst whose surface is covered with a graphene layer.

[0033] The catalyst precursor of the pre...

Embodiment 1

[0063] Take 1g of zinc oxide and 2g of glucose and place them in the high-temperature zone and low-temperature zone of the dual-temperature zone tube furnace respectively. The high-temperature zone rises to 700°C and the low-temperature zone rises to 350°C. Vapor-phase deposition for 1 h can obtain a catalyst whose surface is coated with a graphene layer.

[0064] Add 50ml of 5% hydrochloric acid to the 2.01g graphene-coated zinc oxide catalyst prepared above, sonicate for 0.5h, centrifuge, wash with ethanol and distilled water to obtain a neutral precipitate, and dry at 60°C for 12h to obtain graphite ene cage.

[0065] Add 0.6g of nano-silicon and 0.9g of graphene cages into a ball mill jar, and mix ball milling at 300r / min for 8h under an argon atmosphere to obtain a slurry, and then spray dry to obtain a precursor; The asphalt with 15% of the mass of the precursor is respectively placed in the high temperature zone and the low temperature zone of the dual temperature zone...

Embodiment 2

[0068] Take 2g of copper-zinc alloy and 2g of citric acid and place them in the high-temperature zone and low-temperature zone of the dual-temperature zone tube furnace respectively. Nitrogen chemical vapor deposition for 2 hours to obtain a catalyst whose surface is coated with a graphene layer.

[0069] Add 360ml of 10% nitric acid to the 3.6g graphene-coated copper-zinc alloy catalyst prepared above, ultrasonicate for 2 hours, centrifuge, wash and centrifuge with ethanol and distilled water to obtain a neutral precipitate, and dry at 70°C for 10 hours to obtain graphite ene cage.

[0070] Add 2.7g of nano-silicon and 1.8g of graphene cages into a ball mill jar, and mix ball milling at 600r / min for 2h under an argon atmosphere to obtain a slurry, and then spray dry to obtain a precursor; mix the above obtained precursor with the above obtained The phenolic resin with 25% of the mass of the precursor is placed in the high temperature zone and the low temperature zone of the ...

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Abstract

The invention provides a preparation method of a silicon-carbon negative electrode material and a lithium-ion battery. The method comprises the steps of (A) carrying out chemical vapor deposition on acatalyst precursor and a carbon source to obtain a catalyst of which the surface is coated with a graphene layer; (B) corroding the catalyst of which the surface is coated with the graphene layer byusing acid and separating to obtain a graphene cage material; (C) carrying out ball-milling on the graphene cage material and nano silicon and drying to obtain a precursor material; and (D) carrying out chemical vapor deposition on the precursor material and the carbon source to obtain the silicon-carbon negative electrode material. A layer of thin graphene is formed on the surface of the catalystby adopting a chemical vapor deposition method and the catalyst is removed to form a graphene cage structure; and the nano silicon is deposited into a graphene cage or on the surface of the graphenecage and amorphous carbon is coated as a cushion body and a conductive agent, so that pulverization of silicon in a cycle process can be effectively inhibited and the cycle performance is improved. Meanwhile, the preparation method is simple, short in elapsed time, low in energy consumption, low in cost, green and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a preparation method of a silicon-carbon negative electrode material and a lithium-ion battery thereof. Background technique [0002] Among the currently studied silicon-based materials, elemental silicon has attracted extensive attention due to its high specific capacity (4200mAh / g) and low lithium intercalation potential. However, it is not ideal to use silicon materials as battery materials, mainly because silicon has a huge volume effect in the process of lithium intercalation and deintercalation, and the volume expansion rate is as high as 400%. The internal stress caused by volume expansion makes silicon particles Pulverization causes the active material to fall off directly from the current collector, and the capacity decays sharply; in addition, silicon is a semiconductor with a conductivity of 2.52*10 -4 S / m, the electrical condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 李军蓝利芳卢璐黄思许帅军
Owner 银硅(宁波)科技有限公司
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