Silicon-based cathode composite material and preparation method thereof

A composite material and silicon-based negative electrode technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve environmental pollution and other problems, achieve the effects of reducing volume effect, high specific capacity, improving specific capacity and cycle performance

Active Publication Date: 2014-09-03
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing technology uses corrosive liquid to prepare carbon-silicon-based

Method used

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  • Silicon-based cathode composite material and preparation method thereof
  • Silicon-based cathode composite material and preparation method thereof
  • Silicon-based cathode composite material and preparation method thereof

Examples

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preparation example Construction

[0066] In the third aspect, the embodiment of the present invention provides a method for preparing a silicon-based negative electrode composite material, with figure 1 is a flowchart of the method. as attached figure 1 As shown, the method includes:

[0067] Step 101, uniformly mixing nano-silicon particles and carbon source, and calcining in an inert atmosphere to obtain a carbon-nano-silicon composite material.

[0068] Wherein, the structure of the carbon-nano-silicon composite material is that a first carbon layer is coated on the surface of the nano-silicon particle.

[0069] In step 101, the carbon source is evenly distributed on the surface of the nano-silicon particle by uniformly mixing the nano-silicon particle and the carbon source, and then calcined at a high temperature to carbonize the carbon source into carbon, thereby forming the first carbon on the surface of the nano-silicon particle layer. The thickness of the first carbon layer can be adjusted accordin...

Embodiment 1

[0099] In the embodiment of the present invention, a silicon-based negative electrode composite material is prepared, and the steps are as follows:

[0100] Step a, adding silicon powder and sucrose into a planetary ball mill, ball milling at a speed of 300r / min for 6 hours, and after mixing evenly, the sucrose is coated on the silicon powder. Then put it into a nitrogen atmosphere for high-temperature calcination, heat it to 450°C at a heating rate of 2°C / min, and keep it for 4 hours, so that the sucrose is carbonized into carbon, and at this time, the silicon-based material is coated with a layer of the first carbon. layer to obtain a carbon-nano-silicon composite material. Wherein the mass ratio of silicon powder and sucrose is 3:1.

[0101] Step b, preparation of NiCl 2 aqueous solution, the resulting carbon-nano-silicon composite was added to NiCl 2 In the aqueous solution, after ultrasonication for 50 minutes, stirring was carried out for 30 minutes to ensure that Ni ...

Embodiment 2

[0105] In the embodiment of the present invention, a silicon-based negative electrode composite material is prepared, and the steps are as follows:

[0106] Step a, add silicon monoxide (theoretical specific capacity of silicon monoxide is about 1200mAh / g) and polyvinyl alcohol into a planetary ball mill, ball mill for 6 hours at a speed of 300r / min, mix well, and coat the polyvinyl alcohol on Silicon-based materials. Then put it into a nitrogen atmosphere for high-temperature calcination, heat it to 500°C at a heating rate of 3 / min, and keep it warm for 4 hours, so that the glucose is carbonized into carbon. At this time, the silicon-based material is coated with a first carbon layer. , to obtain carbon-nano-silicon composites.

[0107] Step b, preparation Ni(NO 3 ) 2 aqueous solution, the obtained carbon-nano-silicon composite was added to Ni(NO 3 ) 2 In the aqueous solution, after ultrasonication for 50 minutes, stirring was carried out for 30 minutes to ensure that Ni...

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Abstract

The embodiment of the invention discloses a silicon-based cathode composite material and a preparation method thereof, and belongs to the field of lithium battery cathode materials. An embodiment of the invention is as below: coating nickel hydroxide on the surface of a carbon-nano silicon composite material with a first carbon layer, calcining to remove the first carbon layer, so as to obtain nickel oxide-nano silicon composite material with gaps; then coating a second carbon layer on the surface of the nickel oxide-nano silicon composite material to obtain the silicon-based cathode composite material. The composite material comprises nano silicon particles, a nickel oxide layer arranged outside the nano silicon particles and carbon coating on the nickel oxide; gaps between nickel oxide and nano silicon particles are for containing embedded lithium ions, so as to keep stable structure of the cathode material during lithium deintercalation; and the method reduces the volume effect of the Si-based material and improves specific capacity and cycle performance of the cathode material. The method provided by the embodiment of the invention is safe and environment-friendly, and does not cause environment pollution.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a silicon-based negative electrode composite material and a preparation method thereof. Background technique [0002] Lithium battery (that is, lithium ion battery) is a rechargeable battery that uses carbon active material as the negative electrode and a lithium-containing compound as the positive electrode. The charging and discharging process is the intercalation and deintercalation process of lithium ions: when charging, lithium ions are deintercalated from the positive electrode, pass through the electrolyte and separator, and embed in the negative electrode. The more lithium ions are embedded in the negative electrode, the higher the specific charge capacity of the battery On the contrary, during discharge, lithium ions are deintercalated from the negative electrode, pass through the electrolyte and separator, and intercalate into the po...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/366H01M4/386H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 梅周盛刘三兵朱广燕陈效华
Owner CHERY AUTOMOBILE CO LTD
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