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Hierarchical pore structure silicon-based negative electrode material for lithium battery and preparation method of hierarchical pore structure silicon-based negative electrode material

A technology of silicon-based negative electrode materials and silicon-based materials, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as difficulty in large-scale production, high cost of raw materials, high cost, etc., to achieve improved conductivity, increased coverage area, The effect of mitigating the volume effect

Active Publication Date: 2015-04-29
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared material has a porous structure, which can alleviate the volume effect of silicon particles, but the cost of raw materials is high
The above-mentioned methods have the problems of high cost, complex process, difficulty in large-scale production, and the disadvantages of pollutants

Method used

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  • Hierarchical pore structure silicon-based negative electrode material for lithium battery and preparation method of hierarchical pore structure silicon-based negative electrode material
  • Hierarchical pore structure silicon-based negative electrode material for lithium battery and preparation method of hierarchical pore structure silicon-based negative electrode material
  • Hierarchical pore structure silicon-based negative electrode material for lithium battery and preparation method of hierarchical pore structure silicon-based negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) The silicon dioxide powder waste produced by the vapor deposition method in optical fiber production is subjected to pickling pretreatment. Add it into hydrochloric acid with a concentration of 8% to soak to remove impurities, stir for 2 hours, filter with deionized water to wash and filter repeatedly, and finally dry the filtered product.

[0051] (2) Take 5g of purified silica powder and add it to deionized water to disperse. Use the water bath method to heat up. The temperature of the water bath is controlled at 30°C. Stir magnetically for 1h, add 0.05g of silane coupling agent, and add acetic acid to make the solution The pH value of the mixture was controlled at 4, and stirred for 2 hours to obtain the precursor of the modified carrier. Then add 0.15g of sodium lignosulfonate surfactant, and add acetic acid to control the pH value of the solution to 4, magnetically stir for 2h, and then carry out crystallization treatment at 50°C after standing, deionized washi...

Embodiment 2

[0055] (1) Obtain purified silica powder according to Example 1.

[0056] (2) Take 10g of purified silica powder and add it to deionized water to disperse. Use the water bath method to heat. The pH value of the mixture was controlled at 4, and stirred for 2 hours to obtain the precursor of the modified carrier. Then add 0.4g fatty acid glyceride and sodium dodecylbenzenesulfonate to mix the active agent, and add oxalic acid to control the pH value of the solution to 4, stir magnetically for 2 hours, and carry out crystallization treatment at a temperature of 100°C after standing still. Ion washing, filtering and drying. Then, the filtered product is calcined at a high temperature in air at 500° C. to finally obtain a modified carrier with a honeycomb mesoporous structure.

[0057] (3) Take 10g of the modified carrier material and add it to the ethanol solution, then add 10g of silicon powder (with a particle size distribution of 5-30um), stir magnetically for 2 hours to disp...

Embodiment 3

[0060] (1) Obtain purified silica powder according to Example 1.

[0061] (2) Take 10g of purified silica powder and add it to deionized water to disperse. Use the water bath method to heat up. The temperature of the water bath is controlled at 55°C. Stir magnetically for 1h. Add 0.15g of silane coupling agent and oxalic acid to make the solution The pH value of the mixture was controlled at 4, and stirred for 2 hours to obtain the precursor of the modified carrier. Then add 0.4 g sodium alkylbenzene sulfonate active agent, and add NaOH to control the pH value of the solution to 13, ultrasonically vibrate for 2 hours, and then carry out crystallization treatment at 150° C. after standing, deionized washing, filtering, and drying. Then, the filtered product is calcined at a high temperature in air at 500° C. to finally obtain a modified carrier with a honeycomb mesoporous structure.

[0062] (3) Take 5g of the modified carrier material and add it to the ethanol solution, then ...

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Abstract

The invention relates to a hierarchical pore structure silicon-based negative electrode material for a lithium battery and a preparation method of the hierarchical pore structure silicon-based negative electrode material. The preparation method comprises the following steps: using a waste ultrafine silicon dioxide powder material generated in optical fiber production, firstly performing acid pickling and purification on the silicon dioxide powder, then using a water bath method to disperse the purified silicon dioxide powder into deionized water, adding a silane coupling agent, then adding an acid to the solution, further adding a surfactant, stirring, standing, crystallizing, filtering, drying and calcining the crystal at high temperature to form a modified carrier; adding the modified carrier material to an ethanol solution or deionized water, adding silica powder, stirring and dispersing, filtering and drying to obtain the silicon-based material with a mesoporous structure; then adding the purified silicon dioxide powder to a sodium hydroxide solution, performing high temperature autoclave reaction, adding the silicon-base material with the mesoporous structure and a carbon material to the obtained product, then adding an acid solution, washing, drying and calcining at high temperature, and naturally cooling to obtain the silicon-based negative electrode material with the hierarchical pore structure.

Description

technical field [0001] The invention relates to a silicon-based negative electrode material with a hierarchical porous structure for a lithium battery and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have attracted much attention due to a series of remarkable characteristics such as high voltage, high energy density, small size, long life and fast charging and discharging. With the continuous development of lithium-ion batteries, people have put forward higher requirements on the performance of lithium-ion batteries. As the negative electrode material of lithium-ion batteries, silicon materials have the highest theoretical specific capacity (up to 4200mAh / g), which is much higher than that of carbon materials widely used at present. [0003] However, the biggest disadvantage of silicon as the negative electrode material of lithium batteries is that in the process of alloying with lithium, it is accompanied by a large vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395H01M4/386Y02E60/10
Inventor 吴椿烽沈一春钱宜刚
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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