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Spherical composite positive pole material for lithium sulfur battery and preparation method and application of spherical composite positive pole material

A composite positive electrode material, lithium-sulfur battery technology, applied in the field of electrochemical energy storage, can solve the problems of low cycle stability and capacity retention, low battery energy density, poor battery stability, etc., to improve cycle stability and capacity retention efficiency, reduce process costs, and improve consistency

Active Publication Date: 2015-03-25
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently reported products and preparation methods of lithium-sulfur battery composite cathode materials still have some deficiencies, such as the low sulfur loading of the composite material leads to relatively low energy density of the battery, poor electronic conductivity leads to low cycle stability and low capacity retention, and The existing process is relatively complicated, the process cost is high, and the battery stability is poor

Method used

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  • Spherical composite positive pole material for lithium sulfur battery and preparation method and application of spherical composite positive pole material
  • Spherical composite positive pole material for lithium sulfur battery and preparation method and application of spherical composite positive pole material
  • Spherical composite positive pole material for lithium sulfur battery and preparation method and application of spherical composite positive pole material

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Embodiment 1

[0071] A kind of porous carbon nanosphere, its preparation method is as follows:

[0072] (a) Dissolve 8.0g of glucose in 80mL of deionized water to prepare a colorless and transparent solution of 0.56mol / L, then add it into a hydrothermal reaction kettle with a capacity of 80mL, seal it, heat to 180°C, keep the temperature for 10h, and cool naturally to Room temperature; (b) filter the reaction solution obtained in step (a), wash the filtered precipitate with absolute ethanol and deionized water several times, and dry it with air at 80°C for 24 hours; (c) dissolve 1.08g of zinc chloride in 40mL of deionized water was prepared into a milky white flocculent turbid liquid; (d) 0.5091 g of the precipitated product obtained in step (b) was dried and added to the milky white flocculent turbid liquid prepared in step (c), and ultrasonically dispersed for 6 hours to obtain a turbid liquid; (e ) heating the turbid liquid obtained in step (d) to 120° C. to evaporate to dryness to obtai...

Embodiment 2

[0074] A kind of porous carbon nanosphere, its preparation method is as follows:

[0075] (a) Dissolve 8.0g of glucose in 80mL of deionized water to prepare a colorless and transparent solution of 0.56mol / L, then add it into a hydrothermal reaction kettle with a capacity of 80mL, seal it, heat to 180°C, keep the temperature for 10h, and cool naturally to room temperature; (b) filter the reaction solution obtained in step (a), wash the filtered precipitate with absolute ethanol and deionized water for several times, and dry it with air at 80°C for 24 hours; (c) dissolve 2.07g of zinc chloride in 40mL of deionized water was prepared into a milky white flocculent turbid liquid; (d) 0.5061 g of the precipitated product obtained in step (b) was dried and added to the milky white flocculent turbid liquid prepared in step (c), and ultrasonically dispersed for 6 hours to obtain a turbid liquid; (e ) heating the turbid liquid obtained in step (d) to 120° C. to evaporate to dryness to o...

Embodiment 3

[0077] A kind of porous carbon nanosphere, its preparation method is as follows:

[0078] (a) Dissolve 8.0g of glucose in 80mL of deionized water to prepare a colorless and transparent solution of 0.56mol / L, then add it into a hydrothermal reaction kettle with a capacity of 80mL, seal it, heat to 180°C, keep the temperature for 10h, and cool naturally to room temperature; (b) filter the reaction solution obtained in step (a), wash the filtered precipitate with absolute ethanol and deionized water for several times, and dry at 80°C for 24 hours; (c) dissolve 3.05g of zinc chloride in 40mL of deionized water was prepared into a milky white flocculent turbid liquid; (d) 0.5032 g of the precipitated product obtained in step (b) was dried and added to the milky white flocculent turbid liquid prepared in step (c), and ultrasonically dispersed for 6 hours to obtain a turbid liquid; (e ) heating the turbid liquid obtained in step (d) to 120° C. to evaporate to dryness to obtain a soli...

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Abstract

The invention belongs to the field of electrochemical energy storage and discloses a spherical composite positive pole material for a lithium sulfur battery and a preparation method and application of the spherical composite positive pole material. The spherical composite positive pole material for the lithium sulfur battery is a porous carbon nanosphere / sulfur / polyaniline composite positive pole material and has a 'sandwich' spherical structure; according to a chemical coprecipitation method and a sulfur-bearing in-situ polymerization coated conductive polyaniline one-pot synthesis method, the porous carbon nanosphere / sulfur / polyaniline composite positive pole material is formed. The preparation method is simple in process and low in cost, and the consistency and stability of the product are high. The obtained composite positive pole material for the lithium sulfur battery is high in electronic and ionic conductivity, the sulfur bearing amount is high, diffusion of polysulfides is inhibited, and the composite positive pole material can be used for preparing a composite positive plate of the lithium battery. The obtained composite positive plate for the lithium sulfur battery is excellent in electrochemical performance, and is high in cycling stability and capacity retention ratio.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and relates to a lithium-sulfur battery spherical composite positive electrode material, in particular to a porous carbon nanosphere / sulfur / polyaniline composite positive electrode material and a preparation method thereof, and its use in preparing lithium-sulfur battery positive electrode sheets Applications. Background technique [0002] With the widespread popularization of portable electronic products, the rapid development of power station energy storage technology and electric vehicles, the energy density and power density of the traditional lithium-ion batteries that are currently emerging are facing severe tests. Since elemental sulfur has a high theoretical specific capacity of 1672mAh / g, metal lithium has a theoretical specific capacity of up to 3860mAh / g, and when assembled with metal lithium to form a battery, the theoretical mass specific energy can reach 2600Wh / kg, whic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/5815H01M4/587H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 李小岗饶睦敏刘燕林陈东瑞林海斌刘时铸廖友好邢丽丹许梦清李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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