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Preparation method of nano-sulfur/annular polypyrrole composite positive electrode material

A composite positive electrode material and composite material technology, which is applied in the field of nanomaterial preparation and new energy devices, can solve the problem of volume expansion of electrode materials, and achieve the effects of small size, improved electrochemical activity, and large specific surface area

Inactive Publication Date: 2016-07-13
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the cyclic polypyrrole has more pores than other polypyrrole structures such as linear and spherical, it can load more sulfur and reduce the loss of active materials; and the cyclic polypyrrole has stronger structural flexibility than other structures, and can Solve the problem of volume expansion of electrode materials, thereby improving the cycle performance of lithium-sulfur batteries

Method used

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  • Preparation method of nano-sulfur/annular polypyrrole composite positive electrode material
  • Preparation method of nano-sulfur/annular polypyrrole composite positive electrode material
  • Preparation method of nano-sulfur/annular polypyrrole composite positive electrode material

Examples

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Effect test

Embodiment 1

[0026] (1) Using pyrrole monomer as raw material, prepare 30mM pyrrole solution by manual stirring;

[0027] (2) Using CTAB powder as raw material, prepare 12cmcCTAB solution (wherein 1cmc=0.87mM);

[0028] (3) According to the volume ratio of the pyrrole solution and the CTAB solution being 2:1, the pyrrole solution in step 1 was added to the CTAB solution in step 2, and fully mixed for 30 minutes by magnetic stirring;

[0029] (4) prepare ammonium persulfate solution; the concentration of ammonium persulfate solution is 0.1mM;

[0030] (5) Pre-cool the solutions of step 3 and step 4 at 5°C for 2 hours;

[0031](6) According to the molar ratio of ammonium persulfate and pyrrole monomer of 1:1, add the pre-cooled ammonium persulfate solution to the mixture of pyrrole and CTAB, and fully react at 5°C for 24 hours to form a ring Polypyrrole;

[0032] (7) Suction filter the mixed solution after the reaction in step 6, and alternately wash the sediment three times with distille...

Embodiment 2

[0042] The preparation method of nano-sulfur / cyclic polypyrrole composite positive electrode material applied to lithium-sulfur batteries, the steps are the same as in Example 1, except that the CTAB concentration in step (2) is 4 cmc.

[0043] (1) Using pyrrole monomer as raw material, prepare 30mM pyrrole solution by manual stirring;

[0044] (2) Using CTAB powder as raw material, prepare 4cmcCTAB solution (wherein 1cmc=0.87mM);

[0045] (3) According to the volume ratio of the pyrrole solution and the CTAB solution being 2:1, the pyrrole solution in step 1 was added to the CTAB solution in step 2, and fully mixed for 30 minutes by magnetic stirring;

[0046] (4) prepare ammonium persulfate solution; the concentration of ammonium persulfate solution is 0.1mM;

[0047] (5) Pre-cool the solutions of step 3 and step 4 at 5°C for 2 hours;

[0048] (6) According to the molar ratio of ammonium persulfate and pyrrole monomer of 1:1, add the pre-cooled ammonium persulfate solution...

Embodiment 3

[0056] The preparation method of the nano-sulfur / cyclic polypyrrole composite cathode material applied to lithium-sulfur batteries, the steps are the same as in Example 1, the difference is that the concentration of pyrrole in step (1) is 15mM, and the concentration of CTAB in step (2) It is 4cmc.

[0057] (1) Using pyrrole monomer as raw material, prepare 15mM pyrrole solution by manual stirring;

[0058] (2) Using CTAB powder as raw material, prepare 4cmcCTAB solution (wherein 1cmc=0.87mM);

[0059] (3) According to the volume ratio of the pyrrole solution and the CTAB solution being 2:1, the pyrrole solution in step 1 was added to the CTAB solution in step 2, and fully mixed for 30 minutes by magnetic stirring;

[0060] (4) prepare ammonium persulfate solution; the concentration of ammonium persulfate solution is 0.1mM;

[0061] (5) Pre-cool the solutions of step 3 and step 4 at 5°C for 2 hours;

[0062] (6) According to the molar ratio of ammonium persulfate and pyrrole...

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Abstract

The invention relates to a preparation method of a nano-sulfur / annular polypyrrole composite positive electrode material. The method includes the steps of: mixing a pyrrole solution with a CTAB solution, then performing magnetic stirring for 30-60min; at the same time preparing an ammonium persulfate solution; placing the solution at a temperature of 0-10DEG C to conduct pre-cooling; then adding the ammonium persulfate solution into a mixed solution of the pyrrole solution and CTAB solution, and carrying out reaction for 24-48h; conducting pumping filtration on the reacted mixed solution, and performing washing and drying to obtain annular polypyrrole; mixing a nano-sulfur solution with the annular polypyrrole, then conducting stirring and ultrasound treatment to obtain a dispersed mixed solution; then pouring the dispersed mixed solution into an agate ball milling pot and performing sealing, and carrying out ball-milling and drying; and finally, performing heat preservation at 100-300DEG C for 2-4h, and then conducting cooling to room temperature, thus obtaining the target product. The annular polypyrrole obtained by the invention has the advantages of small size, more porous structures and large specific surface area, and improves the electrochemical activity of the nano-sulfur / annular polypyrrole composite material.

Description

technical field [0001] The technical solution of the present invention relates to a preparation method for a composite material of novel sulfur and polypyrrole, specifically a method for preparing a nanometer sulfur / cyclic polypyrrole composite positive electrode material applied to a lithium-sulfur battery. The invention belongs to the field of nano material preparation and new energy devices. Background technique [0002] With the rapid development of communication and computer technology, the energy storage devices of information electronic products such as mobile phones and notebook computers have an urgent demand for higher performance secondary batteries. Lithium-sulfur batteries are superior to general lithium-ion batteries due to their electrochemical performance (theoretical specific capacity is 1672mAhg -1 , and the specific energy can reach 2600Whkg -1 ), therefore, people have turned their attention to a new type of high specific capacity energy storage system ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/052
CPCH01M4/364H01M10/052Y02E60/10
Inventor 张永光殷福星王新谭台哲
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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