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Nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material as well as preparation method and application thereof

A technology of sulfur cathode material and spherical carbon coating is applied in the field of nitrogen-doped hollow spherical carbon coated sulfur cathode material and its preparation, which can solve the problems of poor cycle stability and short cycle life, and achieve improved cycle life and low charge transfer. The effect of impedance, good cycle stability

Active Publication Date: 2020-04-07
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The primary purpose of the present invention is to solve the technical key urgently needed for the commercialization of lithium-sulfur batteries, overcome the disadvantages of poor cycle stability and short cycle life of lithium-sulfur batteries in the prior art, and provide a nitrogen-doped hollow spherical carbon-coated sulfur Cathode material

Method used

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  • Nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material as well as preparation method and application thereof
  • Nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material as well as preparation method and application thereof
  • Nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0050] The preparation of the nitrogen-doped hollow spherical carbon-coated sulfur material specifically includes the following steps:

[0051] Step 1: Preparation of nitrogen-doped hollow spherical carbon materials

[0052] (1) According to the mass ratio of dopamine hydrochloride and F127 ethylene glycol with a molecular weight of 8000-10000 as 3:5, feed and mix to obtain solid mixture A; according to dopamine hydrochloride, 1,3,5-trimethylbenzene and alcohol / water The mass ratio of the mixed solution is 1:1.6:10 and weighed for later use, wherein the mixed solution of alcohol / water is prepared according to the mass ratio of 1:1; The mixed solution of methylbenzene and alcohol / water is stirred on a magnetic stirrer to allow it to be fully and evenly mixed to obtain a mixed solution B;

[0053] (2) Calculate and measure according to the mass ratio of dopamine hydrochloride and saturated ammonia water as 1:1.5, add the measured ammonia water to the mixed solution B, and the p...

Embodiment 2

[0062] The preparation of the nitrogen-doped hollow spherical carbon-coated sulfur material specifically includes the following steps:

[0063] Step 1: Preparation of nitrogen-doped hollow spherical carbon materials

[0064] (1) According to the mass ratio of dopamine hydrochloride and F127 ethylene glycol with a molecular weight of 10000-20000 as 3:4.5, feed and mix to obtain solid mixture A; The mass ratio of the mixed solution composed at a mass ratio of 1:1 is 1:1.8:5.5 to be weighed for later use, and the mixture of 1,3,5-trimethylbenzene and alcohol / water weighed above is sequentially added to the solid mixture A. solution, stirred on a magnetic stirrer to allow it to fully and evenly mix to obtain a mixed solution B;

[0065] (2) Calculate and take according to the mass ratio of dopamine hydrochloride and saturated ammonia water as 1:1.6, add the ammonia water measured in the mixed solution B, and the polymerization reaction time is 50 minutes; then collect the suspend...

Embodiment 3

[0075] The preparation of the nitrogen-doped hollow spherical carbon-coated sulfur material specifically includes the following steps:

[0076] Step 1: Preparation of nitrogen-doped hollow spherical carbon materials

[0077](1) According to the mass ratio of dopamine hydrochloride and F127 ethylene glycol with a molecular weight of 10000-20000 as 3:3, feed and mix to obtain a solid mixture A; The mass ratio of the mixed solution composed at a mass ratio of 1:1 is 1:1.5:8 and weighed for later use, and the mixture of 1,3,5-trimethylbenzene and alcohol / water weighed above is sequentially added to the solid mixture A. solution, stirred in an electric mixer to allow it to be fully and evenly mixed to obtain a mixed solution B;

[0078] (2) Calculate and take according to the mass ratio of dopamine hydrochloride and saturated ammonia water as 1:1.3, add the ammonia water measured in the mixed solution B, and the polymerization reaction time is 70 minutes; then collect the suspende...

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Abstract

The invention discloses a nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material as well as a preparation method and application thereof. The material is of a spherical core-shell structure with the diameter of 100-400 nanometers, and chemical components of an outer layer comprise a carbon element accounting for 70%-90% of the total mass fraction of the outer layer and anitrogen element accounting for 5%-20% of the total mass fraction of the outer layer; the chemical components of the inner layer comprise a sulfur element accounting for 80-95% of the total mass fraction of the inner layer; and the chemical components of the inner layer account for 65-72% of the total mass fraction of the nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material. The preparation method comprises the following steps: selecting and proportioning polymer materials, and optimizing the preparation processes of the nitrogen-doped hollow spherical carbon-coatedsulfur positive electrode material and the electrode. The commercial technical key of the lithium-sulfur battery positive electrode material is solved, the positive electrode material prepared by theinvention can obviously increase the loading capacity of electrode active sulfur, the cycling stability of a lithium-sulfur battery electrode is enhanced, the service life is prolonged, the production cost is reduced, and the application prospect is wide.

Description

technical field [0001] The invention relates to the fields of material preparation and energy storage, and belongs to the field of positive electrode materials for lithium-sulfur batteries, and specifically refers to a nitrogen-doped hollow spherical carbon-coated sulfur positive electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of portable electronic products and the implementation of the country's new energy strategy, the preparation of lithium-ion batteries with higher specific energy density has become an urgent need in the market. Lithium-sulfur batteries have a theoretical mass specific capacity of 1672 mAh / g and a theoretical mass specific energy density of 2600 W·h / kg, which are much higher than the widely used commercially used ternary lithium battery cathode materials. Promising lithium batteries. More importantly, closed Li-S battery systems are similar to Li-ion batteries, and the switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/058B82Y30/00B82Y40/00
CPCH01M4/366H01M4/38H01M4/62H01M10/052H01M10/058B82Y30/00B82Y40/00Y02E60/10Y02P70/50H01M4/625H01M4/58H01M2004/021H01M4/1397H01M4/0471H01M4/0483H01M4/0416H01M4/667H01M4/623H01M4/661H01M2004/028H01M10/054C01B32/156C01P2002/54C01P2002/88C01P2004/03C01P2004/04C01P2004/34C01P2004/62C01P2006/14C01P2006/40H01M4/0404H01M4/581H01M4/587
Inventor 麦耀华曾帅波
Owner JINAN UNIVERSITY
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