Preparation method of metallic oxide/conducting polymer dually-modified sulfur composite anode material

A composite positive electrode material and conductive polymer technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as electrode structure damage, achieve the effects of improving wettability, broad application prospects, and improving stability

Inactive Publication Date: 2017-02-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elemental sulfur (2.07g / cm -3 ) and lithium sulfide (1.66g / cm -3 ) density difference during the charging and discharging process caused about 76% volume change, leading to the destruction of the electrode structure

Method used

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  • Preparation method of metallic oxide/conducting polymer dually-modified sulfur composite anode material
  • Preparation method of metallic oxide/conducting polymer dually-modified sulfur composite anode material
  • Preparation method of metallic oxide/conducting polymer dually-modified sulfur composite anode material

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Experimental program
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Effect test

Embodiment 1

[0028]In the first step, first add 5g sodium thiosulfate pentahydrate, 0.1g polyvinylpyrrolidone and 7g hydrochloric acid (mass concentration is 37%, the same below) to 100mL deionized water, stir and mix at medium speed for 4 hours by an electromagnetic stirrer. After the reaction, the product was centrifuged and washed (8000 rpm) three times with deionized water and absolute ethanol, and the precipitate obtained by centrifugation was placed in a vacuum drying oven and dried at 60° C. for 36 hours to obtain hollow nano-sulfur particles. Gather spares.

[0029] In the second step, the hollow nano-sulfur particles obtained in the previous step were dispersed into 200 mL of deionized water, and ultrasonically dispersed for 30 minutes to form a uniform solution. Then, 0.122 g of aniline, 0.25 g of hydrochloric acid and 0.2 g of ammonium persulfate were sequentially added to the solution, and stirred and mixed at a medium speed by a magnetic stirrer for 12 hours. After the reacti...

Embodiment 2

[0033] In the first step, 5 g of sodium thiosulfate pentahydrate, 0.1 g of polyvinylpyrrolidone, and 3 g of hydrochloric acid were first added to 100 mL of deionized water, and stirred and mixed at a medium speed by an electromagnetic stirrer for 1 hour. After the reaction, the product was centrifuged and washed (5000 rpm) three times with deionized water and absolute ethanol, and the precipitate obtained by centrifugation was placed in a vacuum drying oven and dried at 40°C for 24 hours to obtain hollow nano-sulfur particles, collected spare.

[0034] In the second step, the hollow nano-sulfur particles obtained in the previous step were dispersed into 200 mL of deionized water, and ultrasonicated for 10 minutes to form a uniform solution. Then, 0.122 g of aniline, 0.08 g of hydrochloric acid and 0.2 g of ammonium persulfate were successively added to the solution, and stirred and mixed at a medium speed by a magnetic stirrer for 18 hours. After the reaction, the product was...

Embodiment 3

[0038] In the first step, 5 g of sodium thiosulfate pentahydrate, 0.1 g of polyvinylpyrrolidone, and 10 g of hydrochloric acid were first added to 100 mL of deionized water, and stirred and mixed at a medium speed by an electromagnetic stirrer for 8 hours. After the reaction, the product was centrifuged and washed (6000 rpm) three times with deionized water and absolute ethanol, and the precipitate obtained by centrifugation was placed in a vacuum drying oven and dried at 80°C for 12 hours to obtain hollow nano-sulfur particles, collected spare.

[0039] In the second step, the hollow nano-sulfur particles obtained in the previous step were dispersed into 200 mL of deionized water, and ultrasonicated for 60 minutes to form a uniform solution. Then, 0.122 g of aniline, 0.48 g of hydrochloric acid and 0.2 g of ammonium persulfate were successively added to the solution, and stirred and mixed at a medium speed by a magnetic stirrer for 6 hours. After the reaction, the product wa...

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Abstract

The invention relates to a preparation method of a metallic oxide/conducting polymer dually-modified sulfur composite anode material. First, sodium thiosulfate pentahydrate and polyvinylpyrrolidone are adopted for synthesizing hollow nano-sulfur particles, and through the structure, the utilization rate of sulfur is increased, and expansion and shrinkage stress generated in the lithiation process can be released inwards; second, the outer layer of hollow nano-sulfur is wrapped with polyaniline, high-temperature sulfidizing is utilized for generating strong chemical bonds between polyaniline and sulfur, and polyaniline is promoted to have a physical barrier and a chemical acting force at the same time to jointly inhibit loss of polysulfide compounds, and the stability of battery circulation is improved; last, good electrochemical performance of nickel metal hydroxide is utilized for conducting external modification, the wettability of the composite material and the transmission efficiency of ions and electrons are improved, and the electrochemical performance of a lithium-sulfur battery is further improved. The lithium-sulfur battery prepared through the method has the advantages of being high in energy density, good in circulating performance, good in rate capability and the like.

Description

technical field [0001] The invention belongs to the technical field of electrode material synthesis, and in particular relates to a method for preparing a metal oxide / conductive polymer double-modified sulfur composite cathode material with excellent performance. Background technique [0002] With the rapid development of science and technology, people have put forward many requirements for mobile electronic devices: safer, faster, larger battery capacity, longer standby time, and traditional lithium-ion battery cathode materials such as lithium iron phosphate, etc., have lower Theoretical specific capacity limits further development. Lithium-sulfur batteries have a high specific capacity (1673mAh*g -1 ) and energy density (2600Wh*kg -1 ) has attracted widespread attention. However, lithium-sulfur batteries using elemental sulfur as the cathode material also have some disadvantages that hinder their commercialization, specifically in the following aspects: [0003] 1. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCH01M4/364H01M4/48H01M4/624H01M4/628Y02E60/10
Inventor 李昱严敏陈浩平航霍永奇余勇苏宝连
Owner WUHAN UNIV OF TECH
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