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A kind of silicon/pedot composite material and preparation method thereof and application as negative electrode material of lithium ion battery

A composite material, aluminum-silicon alloy technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of poor cycle stability and poor conductivity, and achieve less electrode side reactions, good processing performance, and low energy consumption. Effect

Active Publication Date: 2020-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the poor conductivity of the existing silicon negative electrode and the poor cycle stability caused by volume expansion, the purpose of the present invention is to provide a silicon particle with a micron-scale porous structure coated with poly-3,4-ethylenedioxythiophene as a conductive polymer layer. Silicon / PEDOT composite material, which can effectively alleviate the volume change of silicon during charging and discharging, and can improve the conductivity of silicon, and has the advantages that micron-sized silicon is not easy to agglomerate and has better processing performance

Method used

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  • A kind of silicon/pedot composite material and preparation method thereof and application as negative electrode material of lithium ion battery
  • A kind of silicon/pedot composite material and preparation method thereof and application as negative electrode material of lithium ion battery
  • A kind of silicon/pedot composite material and preparation method thereof and application as negative electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] ①Take 1g of aluminum-silicon alloy powder (AlSi 10 ) into the reaction flask, then 90 mL of distilled water was added, and the solution was ultrasonicated for 10 min at room temperature.

[0053] ② Transfer the reaction vial to a magnetic stirrer, add 60 μL of 3,4-ethylenedioxythiophene (EDOT), and stir at room temperature for 10 min.

[0054] ③ Dissolve 0.12g of camphorsulfonic acid in 5mL of distilled water, drop it into the reaction bottle, and stir at room temperature for 10min.

[0055] ④ Dissolve 0.6 g of ammonium persulfate in 5 mL of distilled water, drop it into a reaction bottle, react at room temperature for 24 hours, separate and dry to obtain a PEDOT-coated aluminum-silicon alloy.

[0056] ⑤Take 1g of synthesized AlSi 10 / PEDOT powder added to 0.5mol L -1 Sodium hydroxide solution was mixed and reacted at 60°C for 2 hours, separated and dried to obtain Si / PEDOT.

[0057] ⑥ Dissolve 15mg of Na-CMC in 2mL of deionized water and stir at room temperature fo...

Embodiment 2

[0061] ①Take 1g of AlSi with a particle size of 5μm 10 Add to the reaction bottle, then add 90mL of distilled water, and sonicate at room temperature for 10min.

[0062] ② Transfer the reaction vial to a magnetic stirrer, add 120 μL of 3,4-ethylenedioxythiophene (EDOT), and stir at room temperature for 10 min.

[0063] ③ Dissolve 0.12g of camphorsulfonic acid in 5mL of distilled water, drop it into the reaction bottle, and stir at room temperature for 10min.

[0064] ④ Dissolve 0.6 g of ammonium persulfate in 5 mL of distilled water, drop it into a reaction bottle, react at room temperature for 24 hours, separate and dry to obtain a PEDOT-coated aluminum-silicon alloy.

[0065] ⑤Take 1g of synthesized AlSi 10 / PEDOT powder added to 0.5mol L -1 Sodium hydroxide solution was mixed and reacted at 60°C for 2 hours, separated and dried to obtain Si / PEDOT.

[0066] ⑥ Dissolve 15mg of Na-CMC in 2mL of deionized water and stir at room temperature for 4h.

[0067] ⑦ Grind and mix ...

Embodiment 3

[0070] ①Take 1g of AlSi with a particle size of 5μm 10 Add to the reaction bottle, then add 90mL of distilled water, and sonicate at room temperature for 10min.

[0071] ② Transfer the reaction vial to a magnetic stirrer, add 180 μL of 3,4-ethylenedioxythiophene (EDOT), and stir at room temperature for 10 min.

[0072] ③ Dissolve 0.12g of camphorsulfonic acid in 5mL of distilled water, drop it into the reaction bottle, and stir at room temperature for 10min.

[0073] ④ Dissolve 0.6 g of ammonium persulfate in 5 mL of distilled water, drop it into a reaction bottle, react at room temperature for 24 hours, separate and dry to obtain a PEDOT-coated aluminum-silicon alloy.

[0074] ⑤Take 1g of synthesized AlSi 10 / PEDOT powder added to 0.5mol L -1 Sodium hydroxide solution was mixed and reacted at 60°C for 2 hours, separated and dried to obtain Si / PEDOT.

[0075] ⑥ Dissolve 15mg of Na-CMC in 2mL of deionized water and stir at room temperature for 4h.

[0076] ⑦ Grind and mix ...

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Abstract

The invention discloses a silicon / PEDOT composite material, a preparation method thereof and application thereof in serving as a lithium ion battery cathode material. The silicon / PEDOT composite material is formed by coating micron porous silicon particles bywith poly 3,4- polyethylene dioxythiophene. The preparation method of the silicon / PEDOT composite material comprises the steps of coating the surface of commercial micron aluminum silicon alloy powder by with PEDOT in an in-situ polymerization mode and then performing alkali treatment to etch and remove an aluminum component to obtain the silicon / PEDOT composite material. The preparation method has simpleness and high efficiency, and the prepared composite material is applied to lithium ion battery negative electrodes and shows excellent capacity, multiplying power and circulation performance.

Description

technical field [0001] The present invention relates to a silicon / conductive polymer composite material, in particular to a poly-3,4-ethylenedioxythiophene (PEDOT)-coated micron-scale porous silicon composite material, its preparation method and its high-capacity, high-rate performance The invention relates to an application in a lithium ion battery; it belongs to the technical field of battery materials. Background technique [0002] With the rapid expansion of population and the rapid development of economy, the electrochemical energy storage with lithium-ion battery as the main form has received great attention due to its environmental friendliness, long cycle life, small self-discharge, high energy density and high voltage. Attention, has been widely used in various portable electronic products. However, affected by the lithium storage mechanism and low capacity of existing graphite anode materials, it is difficult for current commercial lithium-ion batteries to meet th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/13
CPCH01M4/13H01M4/134Y02E60/10
Inventor 韩凯蔡鸿雁雷映刘辉叶红齐
Owner CENT SOUTH UNIV
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