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A kind of silicon-carbon-nitrogen composite negative electrode material and preparation method thereof

A technology of negative electrode materials and silicon-based materials, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of negative electrode material cycle stability and poor rate performance, and achieve excellent rate performance, reduced energy band width, and excellent cycle performance. The effect of stability

Active Publication Date: 2017-01-04
CHERY AUTOMOBILE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The negative electrode materials provided by the prior art have poor cycle stability and rate performance

Method used

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  • A kind of silicon-carbon-nitrogen composite negative electrode material and preparation method thereof
  • A kind of silicon-carbon-nitrogen composite negative electrode material and preparation method thereof
  • A kind of silicon-carbon-nitrogen composite negative electrode material and preparation method thereof

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preparation example Construction

[0028] In the first aspect, an embodiment of the present invention provides a method for preparing a silicon-carbon-nitrogen composite negative electrode material, including:

[0029] Step 101. Under an argon atmosphere, heat the mixture of silicon source and nitrogen source to 600-1000°C at a heating rate of 0.5-10°C / min, and sinter at 600-1000°C for 3-15 hours, and then Cool down to room temperature to obtain a nitrogen-doped silicon-based material.

[0030] In the embodiment of the present invention, a mixture of a silicon source and a nitrogen source is sintered in an argon atmosphere, so that nitrogen is doped into the silicon material to form a nitrogen-doped silicon-based material. Since the silicon material is doped with nitrogen, the energy band width of the silicon material can be reduced, the conductivity of the silicon material can be effectively improved, and the cycle stability and rate performance of the prepared negative electrode material can be improved.

[...

Embodiment 1

[0046] Preparation of nitrogen-doped silicon-based materials:

[0047] Mix silicon monoxide and ethylenediamine evenly, then heat the mixture of silicon monoxide and ethylenediamine to 800°C at a heating rate of 3°C / min under an argon atmosphere, and sinter at this temperature for 7 hours. Then cool down to room temperature to obtain a nitrogen-doped silicon-based material. Wherein, the mass fraction of nitrogen in the nitrogen-doped silicon-based material is 4%.

[0048] Coating artificial graphite on the surface of nitrogen-doped silicon-based materials:

[0049] According to the mass ratio: nitrogen-doped silicon-based material: artificial graphite = 2:11, mix the nitrogen-doped silicon-based material and artificial graphite evenly, and in a nitrogen atmosphere, heat the nitrogen-doped silicon-based material at a heating rate of 5°C / min. The mixture of material and artificial graphite was heated to 650°C and sintered at this temperature for 6 hours. Then the temperature ...

Embodiment 2

[0051] Preparation of nitrogen-doped silicon-based materials:

[0052] Mix tetraethyl orthosilicate and acetamide evenly, and then heat the mixture of silicon monoxide and ethylenediamine to 650°C at a heating rate of 1°C / min under an argon atmosphere, and sinter at this temperature for 5 hours. Then cool down to room temperature to obtain a nitrogen-doped silicon-based material. Wherein, the mass fraction of nitrogen in the nitrogen-doped silicon-based material is 0.5%.

[0053] Coating artificial graphite on the surface of nitrogen-doped silicon-based materials:

[0054] According to the mass ratio: nitrogen-doped silicon-based material: artificial graphite = 4:1, mix the nitrogen-doped silicon-based material and artificial graphite evenly, and in a nitrogen atmosphere, heat the nitrogen-doped silicon-based material at a heating rate of 5°C / min. The mixture of material and artificial graphite was heated to 700°C and sintered at this temperature for 8 hours. Then the tempe...

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Abstract

The invention discloses a silicon-carbon-nitrogen composite negative electrode material and a preparation method thereof, belonging to the field of negative electrode materials for lithium ion batteries. The method comprises: heating the mixture of the silicon source and the nitrogen source to 600-1000°C at a heating rate of 0.5-10°C / min under an argon atmosphere, and sintering at a temperature of 600-1000°C for 3-15 hours, Cool down to room temperature to obtain a nitrogen-doped silicon-based material; mix the nitrogen-doped silicon-based material and graphite evenly, and in a nitrogen atmosphere, mix the nitrogen-doped silicon-based material and graphite at a heating rate of 0.5-10°C / min The mixture is heated to 500-900° C., sintered at 500-900° C. for 1-10 hours, and cooled to room temperature to obtain a silicon-carbon-nitrogen composite negative electrode material. The present invention can reduce the energy band width of the silicon material and improve its conductivity by doping the silicon material with nitrogen; the volume effect of the silicon material can be effectively buffered by coating graphite on the surface of the silicon-based material doped with nitrogen, so that The prepared silicon-carbon-nitrogen composite anode material has excellent rate performance and cycle stability.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a silicon-carbon-nitrogen composite negative electrode 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
Inventor 刘三兵梅周盛
Owner CHERY AUTOMOBILE CO LTD
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