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Nitrogen-doped lithium sulfur battery cathode material, preparation method and application

A lithium-sulfur battery and cathode material technology, which is applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve the problem of poor cycle stability of carbon-sulfur composites, poor cycle rate of carbon-sulfur composites, and uniform pore formation. It is difficult to control and other problems, so as to achieve the effect of simple and feasible preparation process, low price and reduced loss.

Active Publication Date: 2019-10-15
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, Song Zhicui et al. reported in the Journal of Power Sources (2019, 421, 23-31) a functional interlayer by rationally designing N / P co-doped carbon as a sulfur carrier and a high-performance lithium-sulfur battery , realizing the synergistic closure of polysulfides, although the lithium-sulfur battery has the advantages of high energy density and low material cost, it suffers from poor cycle life and low Coulombic efficiency due to the shuttle effect of soluble polysulfides
[0005] Although the existing patents and literature reports of lithium-sulfur battery cathode materials show good cycle performance, the preparation methods of the materials are relatively complicated, the uniformity of pore formation is difficult to control, and the pores inside cannot bind sulfur well.
At the same time, it is also difficult for lithium ions to enter and exit, preventing their migration and dissolution into the electrolyte solution, and the cycle rate of the carbon-sulfur complex is poor.
Furthermore, the cycle stability of carbon-sulfur complexes is not good, which cannot meet the actual needs.

Method used

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  • Nitrogen-doped lithium sulfur battery cathode material, preparation method and application
  • Nitrogen-doped lithium sulfur battery cathode material, preparation method and application
  • Nitrogen-doped lithium sulfur battery cathode material, preparation method and application

Examples

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Embodiment 1

[0038] A method for preparing a nitrogen-doped lithium-sulfur battery cathode material, comprising the steps of:

[0039]1) Weigh 0.13g of sodium chloride, add 50ml of water, stir and dissolve at room temperature, then add 0.99g of starch and 0.11g of melamine in turn, stir for 8min and mix until uniform; transfer the above mixture to a constant temperature water bath at 75°C, Stir the reaction for 30 minutes at a rotation speed of 80r / min, then stand the reaction for 30 minutes at 75°C, and obtain the precursor gel after the gelatinization reaction is completed;

[0040] 2) Freezing the precursor gel prepared in step 1) at -20°C for 24 hours, and then freeze-drying at -62°C for 48 hours to obtain the precursor;

[0041] 3) Calcining the precursor prepared in step 2) at 500° C. for 12 hours in an inert atmosphere, and then cooling to room temperature;

[0042] 4) The product prepared in step 3) was added to 100ml of deionized water, soaked and washed 5 times, soaked for 0.5 h...

Embodiment 2

[0045] A method for preparing a nitrogen-doped lithium-sulfur battery cathode material, comprising the steps of:

[0046] 1) Weigh 1.5g of sodium chloride, add it to 50ml of water, stir and dissolve at room temperature, then add 5.0g of starch and 1.5g of melamine in turn, and stir for 10min to mix until uniform; transfer the above mixture to a constant temperature water bath at 80°C, Stir the reaction at 120r / min for 25 minutes, and then let it stand for 25 minutes at 80°C. After the gelatinization reaction is completed, the precursor gel is obtained;

[0047] 2) Freezing the precursor gel prepared in step 1) at -30°C for 20h, and then freeze-drying at -62°C for 56h to obtain the precursor;

[0048] 3) Calcining the precursor prepared in step 2) at 600°C for 8 hours in an inert atmosphere, and then cooling to room temperature;

[0049] 4) Add 200ml of deionized water to the product prepared in step 3), soak and wash 6 times, soak for 1.5 hours each time, remove sodium chlori...

Embodiment 3

[0052] A method for preparing a nitrogen-doped lithium-sulfur battery cathode material, comprising the steps of:

[0053] 1) Weigh 5.0g of sodium chloride, add it into 100ml of water, stir and dissolve at room temperature, then add 10.0g of starch and 5.0g of melamine in turn, stir for 15min and mix until uniform; transfer the above mixture to a constant temperature water bath at 85°C, Stir the reaction at 500r / min for 10 minutes, then let it stand for 15 minutes at 85°C. After the gelatinization reaction is completed, the precursor gel is obtained;

[0054] 2) Freezing the precursor gel prepared in step 1) at -40°C for 18 hours, and then freeze-drying at -62°C for 75 hours to obtain the precursor;

[0055] 3) Calcining the precursor prepared in step 2) at 700°C for 6h in an inert atmosphere, and then cooling to room temperature;

[0056] 4) Add 200ml of deionized water to the product prepared in step 3), soak and wash 8 times, soak for 1.8 hours each time, remove sodium chlo...

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Abstract

The invention provides a nitrogen-doped lithium sulfur battery cathode material, a preparation method and an application. Sodium chloride, melamine and starch are mixed in water; precursor gel is obtained through gelatinization reaction; the precursor gel is freeze-dried, baked at high temperature, soaked and washed; and sodium chloride is removed to obtain nitrogen-doped porous carbon powder. Inorganic salt sodium chloride is added as a pore forming agent, which enables the product to have a uniform micro nano pore structure and high specific surface area. Finally, sulfur particles are loadedby sulfur fumigation to obtain a nitrogen-doped porous carbon-loaded sulfur composite material as a lithium sulfur battery cathode material. The porous structure of the composite material provides alarge number of active sites, which helps to bind polysulfides and inhibit the shuttle effect of polysulfides. The material has good cycle stability and high specific capacity when used as a lithium sulfur battery cathode material. In addition, the preparation method of nitrogen-doped porous carbon has the advantages of mild process conditions, simple steps, cheap raw materials and easy large-scale production.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a preparation method of an inorganic micro-nano carbon powder, in particular to a nitrogen-doped carbon-lithium-sulfur battery cathode material, a preparation method and an application thereof. Background technique [0002] Lithium-sulfur battery is a secondary battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode. During discharge, the negative electrode reacts as lithium loses electrons and generates lithium ions. The positive electrode reaction is sulfur combined with electrons and lithium ions to form sulfide. The potential difference between the reaction with the negative electrode is the working voltage provided by the lithium-sulfur battery. The theoretical specific capacity of lithium-sulfur battery is as high as 1675mAh g -1 , which is much larger than the currently used commercial secondary batteries. In recent ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 谷翠萍陈帅翟慕衡
Owner ANHUI NORMAL UNIV
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