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Conductive polymer-coated silicon-based negative electrode material and preparation method thereof

A technology of silicon-based negative electrode materials and conductive polymers, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of silicon negative electrode materials such as huge volume expansion and poor conductivity, and achieve good electrochemical performance

Active Publication Date: 2016-12-14
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a silicon-based negative electrode material coated with a conductive polymer and its preparation method, aiming at solving the problems of huge volume expansion and poor conductivity of the silicon negative electrode material in the prior art. question

Method used

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  • Conductive polymer-coated silicon-based negative electrode material and preparation method thereof
  • Conductive polymer-coated silicon-based negative electrode material and preparation method thereof
  • Conductive polymer-coated silicon-based negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Take untreated elemental silicon as the active material, see figure 2 , figure 2 It is a scanning electron microscope picture of elemental silicon, and it can be observed that the shape of elemental silicon is spherical, and its particle size ranges from 50 to 80 nm. According to the ratio of active material: acetylene black: binder (PVDF) = 8:1:1 (mass percentage), the electrode film is made by mixing, with lithium sheet as the positive electrode and Cellgard 2300 porous membrane as the diaphragm, and 1 mol L -1 LiPF 6 / EC+DM (volume ratio 1:1) mixed solution as electrolyte, assembled into 2032 button cells. The electrochemical performance test was carried out on the Land-CT2001A (Wuhan Jinnuo Electronics) program-controlled automatic electrochemical tester. see Figure 4 , at a current density of 200 mA·g -1 The charge and discharge test was carried out under the same conditions, the voltage range was set at 0.01~1.0 V, and the initial discharge capacity was 3...

Embodiment 2

[0049] Take 5 mmol of aniline monomer and add it to 100 ml of deionized aqueous solution, and stir it magnetically for about 2 h. Then, 0.5 g of silicon powder (60 nm) was added to the above mixed solution while stirring, and after stirring evenly, ultrasonication was performed for 30 min to obtain a uniformly dispersed silicon dispersion. Subsequently, 1.14 g of ammonium persulfate (APS:ANI=1:1) was dissolved in 20 ml of deionized water, and slowly poured into the above-mentioned silicon dispersion, and kept stirring for 24 h, the solution gradually changed from the original brown to green , the above solution was filtered with a circulating water multipurpose vacuum pump, washed with deionized water and ethanol until the filtrate was colorless, and the obtained product was placed in a vacuum drying oven and dried at 60 °C for 12 h to obtain Si-0.1SA -5 PANI composite material. Active material: acetylene black: binder (SA) = 8:1:1 ratio (mass percentage) was mixed to form an...

Embodiment 3

[0051] Put 0.1 g of sodium alginate powder in 100 ml of deionized water, and magnetically stir for 2 h to completely dissolve the sodium alginate, then add 5 mmol of aniline monomer, and magnetically stir for 2 h. Add 0.5 g of silicon powder (60 nm) to the above mixed solution while stirring, stir well and then ultrasonicate for 30 min to obtain a uniformly dispersed silicon dispersion. Subsequently, 1.14 g of ammonium persulfate (APS: ANI = 1: 1) was dissolved in 20 ml of deionized water, and slowly poured into the above silicon dispersion, stirring continuously for 24 h, the solution gradually changed from brown to green , the above solution was filtered with a circulating water multipurpose vacuum pump, washed with deionized water and ethanol until the filtrate was colorless, and the obtained product was placed in a vacuum drying oven and dried at 60 °C for 12 h to obtain Si-0.1SA -5PANI composite material, the morphology of this Si-0.1SA-5PANI composite material sees ima...

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Abstract

The invention discloses a conductive polymer-coated silicon-based negative electrode material and a preparation method thereof. The method comprises the following steps of adding sodium alginate to a water solution, and then stirring and dissolving the sodium alginate; adding a conductive polymer monomer to the completely dissolved sodium alginate solution and stirring evenly; adding taken nanometer silicon to a mixed solution and mixing evenly through an ultrasound method to obtain a silicon dispersion liquid; adding an initiator to the silicon dispersion liquid and carrying out polymerization reaction on the conductive polymer monomer to obtain the conductive polymer-coated silicon-based negative electrode material; and carrying out washing and drying and finishing preparation of a final product. A three-dimensional mesh structure is built by the conductive polymer, so that the conductive polymer-coated silicon-based negative electrode material has conductivity and also provides a certain accommodation space for volume expansion of the silicon; and the silicon is embedded into the mesh structure, so that the volume effect of the silicon is effectively relieved. Furthermore, the hydroxyl-containing sodium alginate is introduced, so that the structure stability of the overall silicon-based negative electrode material is strengthened.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a silicon-based negative electrode material coated with a conductive polymer and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become a focus of new energy and new materials research because of their advantages such as high specific energy, no memory effect, long service life, high working voltage and environmental friendliness. Lithium-ion batteries are widely used in new energy vehicles as power batteries, but the safety performance, energy density, high rate performance and cycle life of lithium-ion batteries need to be further improved. At present, there is no material that can fully meet the needs of lithium-ion batteries in automotive power systems. battery requirements. [0003] At present, the research and development of lithium-ion battery anode materials mainly focus on carbon materials, lithium titanate, metal oxide...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M10/0525Y02E60/10
Inventor 米宏伟李芳何传新刘剑洪
Owner SHENZHEN UNIV
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