Method for preparing lithium ion battery negative electrode material from photovoltaic industry wastes

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as the inability to carry out large-scale industrial production, the limitation of the wide application of silicon negative electrodes, and the complex production process. The effect of cycle performance and equipment requirements is not high, and the operability is strong

Inactive Publication Date: 2018-02-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Existing technologies are all about commercial nano-silicon particles, the production cost is too high, and the entire production process is complicated, and large-scale industrial production cannot be carried out, which severely limits the wide application of silicon negative electrodes.

Method used

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  • Method for preparing lithium ion battery negative electrode material from photovoltaic industry wastes
  • Method for preparing lithium ion battery negative electrode material from photovoltaic industry wastes

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preparation example Construction

[0041] 2) Preparation of lithium ion battery negative electrode material:

[0042] 2.1), add the silicon powder prepared in step 1) and the dispersant (the mass ratio of the two is 4 to 1) into the solvent together, and disperse for 8-10 hours, so that the silicon powder forms uniform and dispersed nano-silicon particles; Agglomeration; the dispersant is polyhydroxy ionic liquid, alkyl ionic liquid or imidazole ionic liquid, the concentration of ionic liquid (dispersant) is 2-5mol / L; the dispersion method is ultrasonic and stirring;

[0043] 2.2), the initiator ammonium persulfate is added to the solution of step 2.1) and ultrasonicated for 30 minutes, so that the initiator is evenly dispersed on the surface of the silicon particles; the mass ratio of the ammonium persulfate to the monomer in 2.4) is 1 to 2.5;

[0044] 2.3), adding concentrated hydrochloric acid, acidifying the solution, adjusting the pH of the solution to 1-3;

[0045] 2.4), then add the monomer drop by drop...

Embodiment 1

[0050] In this embodiment, the concentration of the dispersion liquid is 3 mol / L, and the monomer is 400 mg.

[0051] 1. Disperse 200 mg of the above silicon powder in 200 mL of deionized water, add 10 mL of the prepared dispersion liquid polyhydroxy ionic liquid to the above liquid, and the concentration of the dispersion liquid is 3 mol / L;

[0052] 2. Stir for a few minutes, ultrasonically disperse for 30 minutes, and stir overnight;

[0053] 3. Weigh the initiator ammonium persulfate, dissolve it in 10mL deionized water, add it to the above liquid, and stir it ultrasonically for 30min;

[0054] 4. Use concentrated hydrochloric acid to adjust the pH of the solution obtained in step 3 to 1, add 400 mg of aniline monomer dropwise to the solution, and stir and react for 8 hours under ice bath conditions; the mass ratio of the initiator ammonium persulfate to the aniline monomer is 1 to 2.5;

[0055] 5. Centrifuge, wash until neutral, dry, and grind to obtain the lithium-ion b...

Embodiment 2

[0058] In this embodiment, the concentration of the dispersion liquid is 4 mol / L, and the monomer is 500 mg.

[0059] 1. Disperse 200 mg of the above silicon powder in 200 mL of deionized water, add 10 mL of the prepared dispersion liquid alkyl ionic liquid to the above liquid, and the concentration of the dispersion liquid is 4 mol / L;

[0060] 2. Stir for a few minutes, ultrasonically disperse for 30 minutes, and stir overnight;

[0061] 3. Weigh the initiator ammonium persulfate, dissolve it in 10mL deionized water, add it to the above liquid, and stir it ultrasonically for 30 minutes; the mass ratio of the initiator ammonium persulfate to thiophene monomer is 1:2.5;

[0062] 4. Use concentrated hydrochloric acid to adjust the pH of the solution obtained in step 3 to 3, add 500 mg of thiophene monomer dropwise to the solution, and stir for 8 hours in an ice bath;

[0063] 5. Centrifuge, wash until neutral, dry, and grind to obtain the lithium-ion battery negative electrode ...

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Abstract

The invention discloses a method for preparing a lithium ion battery negative electrode material from photovoltaic industry wastes. The method comprises 1) pretreating photovoltaic industry wastes toobtain silicon powder, and 2) preparing a lithium ion battery negative electrode material through 2.1), adding the prepared silicon powder and a dispersant into a solvent according to a mass ratio of4 to 1 and carrying out dispersion to obtain uniformly dispersed nano-silicon particles, 2.2), adding an initiator ammonium persulfate into the solution obtained by the step 2.1) and carrying out ultrasonic dispersion, 2.3), acidifying the solution and adjusting the pH of the solution to 1-3, 2.4), then dropwisely adding monomers into the silicon particles for coating and stirring the mixture fora reaction in an ice bath for 8-12h, and 2.5) after the reaction, centrifuging the liquid, washing the liquid to pH of 7, then carrying out vacuum drying and carrying out grinding to obtain the lithium ion battery negative electrode material. Through treatment on photovoltaic industry wastes, the silicon raw material is modified through the simple and easy industrial use method and the commercialapplication of the silicon negative electrode is promoted.

Description

technical field [0001] The invention relates to the technical field of waste material utilization, in particular to a method for preparing negative electrode materials of lithium-ion batteries by using photovoltaic industry waste materials. Background technique [0002] Severe challenges such as climate warming, environmental degradation, and the depletion of fossil fuels force people to have an urgent demand for green and environmentally friendly new energy. At the same time, with the rapid development of Internet technology, various mobile electronic devices are changing with each passing day, and the demand for high energy density, portable and safe power supply is also increasing. Lithium-ion batteries have aroused widespread interest due to their high energy density, good cycle performance, clean and portable, and other characteristics. [0003] At present, the anode material of commercial lithium-ion batteries is graphite, but the theoretical specific capacity of grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/364H01M4/386H01M4/624H01M4/628Y02E60/10
Inventor 李明涛杜庆阳屈龙
Owner XI AN JIAOTONG UNIV
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