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Preparation method of graphitic microspheres for lithium ion battery negative electrode

A lithium-ion battery and microsphere technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex production equipment, low yield of carbon microspheres, and great environmental hazards, and achieve low production costs, abundant sources, Inexpensive effect

Inactive Publication Date: 2013-04-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing carbon microsphere preparation methods still have some shortcomings, including complex production equipment, high energy consumption, great environmental hazards in the production process, high production costs, and low yield of carbon microspheres, etc.

Method used

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  • Preparation method of graphitic microspheres for lithium ion battery negative electrode
  • Preparation method of graphitic microspheres for lithium ion battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Using medium-temperature coal tar pitch as raw material, the amphiphilic carbon material was prepared by a general and well-known preparation method. The specific preparation process was as follows: 50 mL of mixed acid (concentrated nitric acid with a concentration of 65% and concentrated sulfuric acid with a concentration of 98% in a volume ratio of 3 :7 preparation) heated to 80 °C, stirred at a stirring rate of 300 r / min, added 10 g of medium-temperature coal tar pitch, reacted for 1 h, poured the reactant into 500 mL of deionized water to terminate the reaction, and filtered it with a vacuum filter. The obtained filter cake was washed with deionized water until neutral; the obtained solid matter was added to 500 ml of NaOH solution with a concentration of 1 mol / L, stirred at 80 °C for 1 h at a speed of 300 r / min, and filtered under reduced pressure. During this process, keep the pH value of the solution greater than 12; collect the filtrate, add 1 mol / L of HCl dr...

Embodiment 2

[0021] 1. The pitch-based amphiphilic carbon material was prepared according to the method described in Step 1 of Example 1.

[0022] 2. Take 0.6 g of the pitch-based amphiphilic carbon material prepared in step 1 and add it to 20 ml of deionized water, adjust the pH value to 12 with ethylenediamine, heat up to 60 °C, and stir at a speed of 600 r / min for 1.5 h to obtain the mass Amphiphilic carbon solution with a concentration of 2.91%; under the condition of stirring at a rotational speed of 1500 r / min, add the amphiphilic carbon material solution to 500 mL of anhydrous acetone, let it stand for stratification, and remove the eutectic matter of acetone and water in the upper layer, The amphiphilic carbon material-based gel microspheres in the lower layer were obtained; the obtained amphiphilic carbon material-based gel microspheres were added to 600 mL of absolute ethanol, stirred at a speed of 1500 r / min for 10 h, and then centrifuged , the obtained gel microspheres were d...

Embodiment 3

[0025] 1. The pitch-based amphiphilic carbon material was prepared according to the method described in Step 1 of Example 1.

[0026] 2. Take 1.5 g of the pitch-based amphiphilic carbon material prepared in step 1 and add it to 20 ml of deionized water, adjust the pH value to 12 with ethylenediamine, heat up to 60 °C, and stir at a speed of 600 r / min for 1.5 h to obtain the mass Amphiphilic carbon solution with a concentration of 6.98%; under the condition of stirring at a rotating speed of 1500 r / min, add the amphiphilic carbon material solution to 500 mL of anhydrous acetone, let it stand for stratification, and remove the eutectic matter of acetone and water in the upper layer, The amphiphilic carbon material-based gel microspheres in the lower layer were obtained; the obtained amphiphilic carbon material-based gel microspheres were added to 600 mL of anhydrous acetone, stirred at a speed of 1500 r / min for 10 h, and then centrifuged , the obtained gel was dried in a vacuu...

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Abstract

The invention discloses a preparation method of graphitic microspheres for a lithium ion battery negative electrode, belonging to a lithium ion battery negative electrode material technology. According to the graphitic microspheres for the lithium ion battery negative electrode, the particle size ranges from 1 micron to 50 microns, the graphite interlayer spacing d002 ranges from 0.3390nm to 0.3420nm, the preparation method comprises the following steps: preparing an amphipathic carbon material into solution, regulating the pH of the solution with ethylene diamine; dripwise adding the amphipathic carbon material solution into anhydrous acetone to form amphipathic carbon material base gel microspheres; and conducting replacement, drying and graphitization processing to the amphipathic carbon material base gel microspheres through acetone solvent to obtain graphitic microspheres. The preparation method has the advantages of being simple in process, low in energy consumption, and environment-friendly; and as lithium ion battery negative electrode, the graphitic microspheres obtained by adopting the method are high in specific capacity, and good in cycling performance.

Description

technical field [0001] The invention relates to a preparation method of graphite microspheres for negative electrodes of lithium ion batteries, which belongs to the negative electrode material technology of lithium ion batteries. Background technique [0002] Due to the characteristics of high energy density, high operating voltage, long cycle life, no memory effect, wide operating temperature range, and good safety performance, lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, aerospace, biomedicine and other fields. Wide range of applications. Improving the energy and cycle life of lithium-ion batteries depends on the improvement of the performance of lithium-ion anode materials. The current commercial lithium-ion battery anode materials use carbon materials, among which carbon microspheres are considered to have the most potential for development. This is because compared with other carbon materials, carbon microspheres have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 王成扬张翠陈明鸣
Owner TIANJIN UNIV
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