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Carbon nanotube/nanosulfur/polyaniline composite electrode, preparation method and application

A technology of carbon nanotubes and composite electrodes, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as poor performance of carbon-sulfur materials, poor cycle performance, and affecting the application range of materials, so as to increase the absorption Liquid retention capacity, good power performance, and the effect of inhibiting the dissolution and loss of sulfur

Active Publication Date: 2019-02-12
深圳博磊达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its charge storage capacity still needs to be improved. Sulfide and its reduction products are easy to dissolve in the electrolyte, resulting in poor cycle performance. At the same time, the performance of carbon-sulfur materials under high magnification is not good, which affects the application range of materials.

Method used

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  • Carbon nanotube/nanosulfur/polyaniline composite electrode, preparation method and application
  • Carbon nanotube/nanosulfur/polyaniline composite electrode, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The carbon nanotube / nanosulfur / polyaniline composite electrode is obtained by electrochemically depositing polyaniline on the surface of the base electrode formed of carbon nanotube / nanosulfur composite material, and the preparation steps are:

[0033] 1) Preparation of basic electrode

[0034] Add 15.8g sodium thiosulfate and 3g polyvinylpyrrolidone into 100mL water and mix well, then add 5mL concentrated hydrochloric acid, stir and react for 3h to form a nano-sulfur particle suspension, centrifuge to discard the supernatant, wash and dry to obtain nano sulfur;

[0035] Mix 30g of nano-sulfur, 5g of calcium bicarbonate and 150mL of carbon nanotube conductive liquid with a concentration of 6%, then coat the copper foil, and sinter it at 180℃ for 2h, remove the copper foil and pulverize to obtain carbon nanotubes / Nano-sulfur composite materials;

[0036] Weigh 94g carbon nanotube / nanosulfur composite material, 2g conductive agent SP, 3g polyvinylidene fluoride and 100g N-methy...

Embodiment 2

[0041] The carbon nanotube / nanosulfur / polyaniline composite electrode is obtained by electrochemically depositing polyaniline on the surface of the base electrode formed of carbon nanotube / nanosulfur composite material, and the preparation steps are:

[0042] 1) Preparation of basic electrode

[0043] Add 15.8g sodium thiosulfate and 3g polyvinylpyrrolidone into 100mL water and mix well, then add 5mL concentrated hydrochloric acid, stir and react for 3h to form a nano-sulfur particle suspension, centrifuge to discard the supernatant, wash and dry to obtain nano sulfur;

[0044] Weigh 10g of nano-sulfur, 1g of calcium bicarbonate and 100mL of carbon nanotube conductive liquid with a concentration of 5%, then coat copper foil, and sinter at 150℃ for 1h, remove the copper foil and pulverize to obtain carbon nanotubes / Nano-sulfur composite materials;

[0045] Weigh 90g of carbon nanotube / nanosulfur composite material, 3g of conductive agent carbon black, 3g of sodium alginate and 100g o...

Embodiment 3

[0050] The carbon nanotube / nanosulfur / polyaniline composite electrode is obtained by electrochemically depositing polyaniline on the surface of the base electrode formed of carbon nanotube / nanosulfur composite material, and the preparation steps are:

[0051] 1) Preparation of basic electrode

[0052] Add 15.8g sodium thiosulfate and 3g polyvinylpyrrolidone into 100mL water and mix well, then add 5mL concentrated hydrochloric acid, stir and react for 3h to form a nano-sulfur particle suspension, centrifuge to discard the supernatant, wash and dry to obtain nano sulfur;

[0053] Mix 50g of nano-sulfur, 10g of calcium bicarbonate and 200mL of carbon nanotube conductive liquid with a concentration of 8%, then coat the copper foil, and sinter at 200℃ for 3h, remove the copper foil and pulverize to obtain carbon nanotubes / Nano-sulfur composite materials;

[0054] Weigh 95g of carbon nanotube / nanosulfur composite material, 1g of conductive agent acetylene black, 5g of polytetrafluoroethyl...

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Abstract

The invention discloses a carbon nanotube / nano sulfur / polyaniline composite electrode, and a preparation method and an application thereof, and belongs to the technical field of electrochemistry and new energy products. The composite electrode has a core-shell structure, an inner core is a carbon nanotube / nano sulfur composite material, an outer shell is uniform and dense polyaniline formed by cyclic voltammetry electrodeposition, and the composite electrode has the characteristics of high electric conductivity, high specific capacity, strong electrochemical stability and the like. Nano-scale carbon nanotubes and a conductive polymer can effectively improve poor conductivity defect of elemental sulfur and an electrochemical reaction product thereof, and the conductive ability of an active substance is greatly improved. At the same time, the nano material has a certain adsorption effect on the intermediate product of a discharge reaction, and the sulfur dissolution loss during the charge / discharge processes can be effectively inhibited. Moreover, the carbon nanotube / nano sulfur inner core having a porous structure plays a buffer role on volume change of sulfur in the charge / discharge processes, can reduce the self swelling rate of the material, increases the liquid absorption and preserving abilities, and improves the cycle performance of the electrode.

Description

Technical field [0001] The invention relates to a carbon nanotube / nano sulfur / polyaniline composite electrode, and also relates to a preparation method and application of the composite electrode, and belongs to the technical field of electrochemistry and new energy products. Background technique [0002] Compared with traditional electrode materials, both elemental aluminum and sulfur have the advantages of high theoretical density, low price, and environmental friendliness. The theoretical energy density of metallic aluminum is as high as 2980mAh / g, second only to metallic lithium (3682mAh / g), and its volumetric specific capacity is 8050mAh / cm 3 , About lithium (2040mAh / cm 3 ) 4 times, and the chemical activity is relatively stable, is one of the rational negative electrode materials. Elemental sulfur also has a higher theoretical energy density (1670mAh / g), and is also known as the cathode material with the highest energy density. Therefore, the aluminum-sulfur battery is an i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/62H01M10/054
CPCH01M4/13H01M4/139H01M4/366H01M4/624H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 王燕王磊原东甲李志
Owner 深圳博磊达新能源科技有限公司
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