Silicon-carbon negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve problems such as inability to meet industrialization needs, high cost, complicated preparation process, etc., and achieve a solution The effect of poor cycle performance and easy industrial implementation

Pending Publication Date: 2020-11-06
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of silicon nanowires, silicon nanotubes, and silicon nanofilms is complex and costl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example one

[0028] A preparation method of silicon carbon anode material for lithium ion battery, including the following steps:

[0029] Step 1: Spread a layer of carbon black as a heat insulating material on the bottom of the graphitization furnace core;

[0030] Step 2: By weight, 10 parts of silicon carbide powder with an average particle size of 10.5 μm and 200 parts of resistor material with a particle size of 8 mm are uniformly mixed and then spread flat on the carbon black;

[0031] Step 3: The average particle size of 100 parts is 16.8 μm and the specific surface area is 54.6 m 2 / g of porous carbon material is laid flat on the silicon carbide / resistive material composite layer;

[0032] Step 4: Lay a graphite plate and an insulating material with a particle size of 0.1 mm on the porous carbon layer in sequence, and fill the same specifications of insulating material around the graphitization furnace at the same time;

[0033] Step 5. The silicon carbide / resistance mate...

Example Embodiment

[0035] Example two

[0036] A preparation method of silicon carbon anode material for lithium ion battery, including the following steps:

[0037] Step 1: Spread a layer of carbon black as a heat insulating material on the bottom of the graphitization furnace core;

[0038] Step 2: By weight, 12.5 parts of silicon carbide powder with an average particle size of 12.8 μm and 200 parts of resistor material with a particle size of 12 mm are uniformly mixed and then spread flat on the carbon black;

[0039] Step 3. Set 100 parts with an average particle size of 17.2 μm and a specific surface area of ​​67.2m 2 / g of porous carbon material is laid flat on the silicon carbide / resistive material composite layer;

[0040] Step 4: Lay a graphite plate and an insulating material with a grain size of 0.5 mm on the porous carbon layer in sequence, and fill the circumference of the graphitization furnace with insulating material of the same specification at the same time;

[0041] Step 5. The silicon ...

Example Embodiment

[0043] Example three

[0044] A preparation method of silicon carbon anode material for lithium ion battery, including the following steps:

[0045] Step 1: Spread a layer of carbon black as a heat insulating material on the bottom of the graphitization furnace core;

[0046] Step 2: By weight, 15 parts of silicon carbide powder with an average particle size of 15.6 μm and 200 parts of resistor material with a particle size of 15 mm are uniformly mixed and then spread on the carbon black;

[0047] Step 3: The average particle size of 100 parts is 18.3 μm and the specific surface area is 79.2 m 2 / g of porous carbon material is laid flat on the silicon carbide / resistive material composite layer;

[0048] Step 4: Lay graphite plates and insulation material with a grain size of 1 mm on the porous carbon layer in sequence, and fill the circumference of the graphitization furnace with insulation material of the same specification at the same time;

[0049] Step 5. The silicon carbide / resista...

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Abstract

The invention discloses a silicon-carbon negative electrode material of a lithium ion battery. The negative electrode material is a composite material prepared from nano silicon particles and porous carbon, and the nano silicon particles are generated by in-situ thermal decomposition of raw material silicon carbide. The invention also provides a preparation method of the silicon-carbon negative electrode material for the lithium ion battery. The preparation method comprises the following steps: paving a layer of carbon black at the bottom of the graphitization furnace core as a heat insulationmaterial; uniformly mixing 10-20 parts of silicon carbide powder with the average particle size of 10-20 [mu]m and 200 parts of a resistance material with the particle size of 8-25 mm, and paving themixture on carbon black; and paving 100 parts of porous carbon material with the average particle size of 16-20 microns and the specific surface area of 50-100 m<2>/g on the silicon carbide/resistance material composite layer. Compared with the prior art, the prepared negative electrode material has the advantages that the first gram capacity is greater than 600 mAh/g, the first coulombic efficiency is greater than 85.4%, and the problem of poor cycle performance of a silicon-based negative electrode material is effectively solved.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a silicon-carbon negative electrode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] The development of lithium-ion batteries with high energy density and long cycle life is of great significance for applications in portable electronics and electric vehicles. To this end, electrode materials must possess high lithium storage capacity and satisfactory cycle stability. As an alternative material for graphite anodes, silicon has the highest known theoretical specific capacity (4200 mAh / g) and a suitable charge-discharge platform (0.4–0.5 V), and is considered the most promising anode material. However, silicon is completely intercalated to form an alloy Li 22 Si 5 A volume expansion of up to 300% will occur when the electrode is pulverized, separated from the current collector, and the specific capacity is rapidly atte...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCH01M4/386H01M4/628H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 李海杨应昌黄伟
Owner TONGREN UNIV
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