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Lithium sulfur battery anode material and lithium sulfur battery utilizing same

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of restricting the cycle stability of lithium-sulfur batteries, low utilization rate of active materials, loss of active materials, etc., to achieve faster Effects of reaction kinetics, improvement of cycle stability, and improvement of battery performance

Inactive Publication Date: 2018-03-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in lithium-sulfur batteries: first, the poor conductivity of elemental sulfur and its reduced product lithium sulfide leads to low utilization of active materials; second, the dissolution and diffusion of intermediate products leads to the loss of active materials, this "shuttle effect" Occurrence seriously restricts the cycle stability of lithium-sulfur batteries

Method used

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  • Lithium sulfur battery anode material and lithium sulfur battery utilizing same
  • Lithium sulfur battery anode material and lithium sulfur battery utilizing same
  • Lithium sulfur battery anode material and lithium sulfur battery utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) 2g of o-phenylenediamine monomer is ultrasonically dissolved in 2mol / L hydrochloric acid solution, and after the monomer is dissolved, 0.0849g of iron phthalocyanine is added under ultrasonic conditions, and then 5g of nano-silica spherical hard template is ultrasonically Under conditions, add to the above solution, add 20mL of 1mol / L FeCl 3 Aqueous solution, stirred and polymerized at 0°C for 24h.

[0031] (2) The reactants obtained above were centrifuged and dried to obtain a solid product. Under a nitrogen atmosphere, the temperature was raised to 900° C. at a rate of 10° C. / min, kept at this temperature for 1 hour, and taken out after naturally cooling down to room temperature.

[0032] (3) After the solid is ground into powder, it is added to 4 mol / L ammonium bifluoride aqueous solution to etch away the nano-silicon spheres, stirred and etched at room temperature for 24 hours, cleaned with deionized water, and dried at 60°C for 24 hours to obtain Fe-N heteroat...

Embodiment 2

[0036] (1) 2g of o-phenylenediamine monomer is ultrasonically dissolved in 2mol / L hydrochloric acid solution, and after the monomer is dissolved, 0.1773g of iron phthalocyanine is added under ultrasonic conditions, and then 5g of nano-silica spherical hard template is ultrasonically Under certain conditions, it was added to the above solution, and after ultrasonication for 0.5h, 20mL of 1mol / L ammonium persulfate aqueous solution was added, and the mixture was stirred and polymerized at 0°C for 24h.

[0037] (2) The reactants obtained above were centrifuged and dried to obtain a solid product. Under a nitrogen atmosphere, the temperature was raised to 900° C. at a rate of 5° C. / min, kept at this temperature for 2 hours, and taken out after naturally cooling down to room temperature.

[0038] (3) After the solid is ground into powder, it is added to 4 mol / L ammonium bifluoride aqueous solution to etch away the nano-silicon spheres, stirred and etched at room temperature for 24 h...

Embodiment 3

[0042] (1) 2g of o-phenylenediamine monomer is ultrasonically dissolved in 2mol / L hydrochloric acid solution, and after the monomer is dissolved, 0.1773g of iron phthalocyanine is added under ultrasonic conditions, and then 5g of nano-silica spherical hard template is ultrasonically Under the conditions, add to the above solution, add 40mL 1mol / L FeCl 3 Aqueous solution, stirred and polymerized at 0°C for 24h.

[0043] (2) The reactants obtained above were centrifuged and dried to obtain a solid product. Under a nitrogen atmosphere, the temperature was raised to 900° C. at a rate of 5° C. / min, kept at this temperature for 1 hour, and taken out after naturally cooling down to room temperature.

[0044] (3) After the solid is ground into powder, it is added to 4 mol / L ammonium bifluoride aqueous solution to etch away the nano-silicon spheres, stirred and etched at room temperature for 24 hours, cleaned with deionized water, and dried at 60°C for 24 hours to obtain Fe-N heteroat...

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Abstract

The invention discloses a lithium sulfur battery anode material and a lithium sulfur battery utilizing same. By adopting an in-situ doping method, iron and nitrogen are jointly added, and an iron-nitrogen exotic atom dual-doped porous carbon material is prepared by adopting a hard template method. The method comprises the following steps: preparing a precursor, a catalyst and a previous polymer ofa hard template; calcining the previous polymer to obtain solids; and etching, cleaning and drying the solids to obtain the carbon material of the invention. The prepared carbon material is uniformlymixed with sulfur powder to be heated in an argon atmosphere to form a carbon sulfur composite material which is applied to the lithium sulfur battery. The obtained carbon material is relatively highin content of nitrogen and iron, relatively high in specific surface area and yield, simple in preparation step and easy in operation. When the lithium sulfur battery anode material is applied to thelithium sulfur battery, the electrochemical performance is relatively good, compared with the iron-free carbon material, the performance is apparently improved, the sulfur can be well fixed by addingthe iron catalyst, the shuttle of the poly-sulfide can be inhibited, and the reaction dynamics can be accelerated, so that the cycling stability of the lithium sulfur battery can be improved.

Description

technical field [0001] The invention relates to an iron-nitrogen heteroatom double-doped porous carbonaceous positive electrode material used for lithium-sulfur batteries; it relates to a lithium-sulfur battery using the carbonaceous positive electrode material. Background technique [0002] Elemental sulfur has a high theoretical specific capacity (1675mAh g -1 ) and theoretical specific energy (2600Wh kg -1 ), considered to be one of the best choices for next-generation high-energy-density secondary batteries. In addition, the characteristics of abundant elemental sulfur reserves, low price, high safety and environmental friendliness make this system extremely commercially valuable. However, there are still some problems in lithium-sulfur batteries: first, the poor conductivity of elemental sulfur and its reduced product lithium sulfide leads to low utilization of active materials; second, the dissolution and diffusion of intermediate products leads to the loss of active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 杨文刘珍珍张小玲
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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