Elemental sulfur anode of secondary lithium-sulfur battery and preparation method of elemental sulfur anode

A lithium-sulfur battery and elemental sulfur technology, applied in the field of electrochemical batteries, can solve the problems of cumbersome preparation process, uneven distribution of active material sulfur and conductive agent, etc., achieve uniform dispersion of sulfur and carbon, improve cycle stability, and increase conductivity Effect

Active Publication Date: 2014-01-08
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for preparing the elemental sulfur positive electrode of a lithium-sulfur battery, which utilizes the phase conversion of sulfur, a Pot method to prepare elemental sulfur positive electrode, simple preparation method, uniform dispersion of sulfur and carbon, high loading capacity, and high utilization rate of elemental sulfur

Method used

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  • Elemental sulfur anode of secondary lithium-sulfur battery and preparation method of elemental sulfur anode
  • Elemental sulfur anode of secondary lithium-sulfur battery and preparation method of elemental sulfur anode
  • Elemental sulfur anode of secondary lithium-sulfur battery and preparation method of elemental sulfur anode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh sublimated sulfur:SP carbon black (hereinafter referred to as SP) according to the mass ratio: VGCF:PVDF=60:22:8:10, mix SP, VGCF and PVDF evenly, place in a closed glass bottle, and add A certain amount of NMP was stirred magnetically for 60 minutes to prepare a slurry in which the conductive agent was uniformly mixed, and the sublimated sulfur was reserved for the next step;

[0034] (2) Take a certain amount of CS 2 Liquid, the sublimated sulfur powder is configured as S-CS with a mass fraction of 10% 2 solution;

[0035] (3) the S-CS 2 Add the solution dropwise to the uniformly mixed early slurry prepared in step (1) through a peristaltic pump, and stir for 3 hours; then open the container and continue stirring for 30 minutes to obtain a uniformly mixed final slurry;

[0036] (4) Apply the final slurry on the corroded aluminum foil with a spatula, and dry it in vacuum at 50°C for 24 hours to obtain the final electrode sheet.

[0037] The final pole pie...

Embodiment 2

[0049] (1) Weigh the sublimed sulfur according to the mass ratio: SP:CNT:PVDF=66:16:8:10, mix SP, VGCF and PVDF evenly, place in a sealed glass bottle, add a certain amount of NMP, and stir magnetically 60 minutes to prepare the early slurry with conductive agent mixed uniformly, and the sublimated sulfur is reserved for the next step;

[0050] (2) Measure a certain amount of xylene liquid, and prepare the sublimated sulfur powder into an S-xylene solution with a mass fraction of 10%;

[0051] (3) Add the S-xylene solution dropwise to the uniformly mixed preliminary slurry prepared in step (1) through a peristaltic pump, and stir for 3 hours; then open the container and continue stirring for 30 minutes to obtain a uniformly mixed final slurry ;

[0052] (4) Apply the final slurry on the carbon-coated aluminum foil with a spatula, and dry it in vacuum at 50°C for 24 hours to obtain the final electrode sheet.

Embodiment 3

[0054] (1) Weigh the sublimed sulfur according to the mass ratio: SP:VGCF:PVDF=60:22:8:10, mix SP, VGCF and PVDF evenly and put it in a closed glass bottle, add a certain amount of NMP, and stir it magnetically 60 minutes to prepare the early slurry with conductive agent mixed uniformly, and the sublimated sulfur is reserved for the next step;

[0055] (2) Take a certain amount of DMSO solution, and prepare the sublimated sulfur powder into an S-DMSO solution with a mass fraction of 10%;

[0056] (3) Add the S-xylene solution dropwise to the homogeneously mixed early slurry prepared in step (1) through a peristaltic pump, heat to 115°C, and stir for 3 hours; then open the container and stop heating, continue Stir for 30min to make a uniform final slurry;

[0057] (4) Apply the final slurry on the carbon-coated aluminum foil with a spatula, and dry it in vacuum at 50°C for 24 hours to obtain the final electrode sheet.

[0058] The key to the preparation method provided by the...

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Abstract

The invention provides an elemental sulfur anode of a secondary lithium-sulfur battery and a preparation method of the elemental sulfur anode. The method comprises the following steps: step 1, dissolving sublimed sulfur in a volatile solvent to prepare a sulfur solution; step 2, dispersing a composite conductive agent into an NMP (Nuclear Matrix Protein) solution of a binder PVDF (Polyvinylidene Fluoride) and stirring to prepare a finely-dispersed previous slurry; step 3, dropwise adding the sulfur solution into the previous slurry, and continuing to stir; step 4, opening a closed container, and continuing to stir for 0.5-1 hour to obtain slurry with uniformly-dispersed sulfur and carbon; step 5, coating the slurry onto a current collector; step 6, punching after vacuum drying, wherein the dosage rate of the sublimed sulfur, the conductive agent and the binder is (40-80):(50-10):10. The method uses functionalized aluminum foil as the current collector, the slurry with uniformly-dispersed and closely-connected sulfur and carbon prepared with a one-pot method is used as a coating layer, and therefore an electrode piece which has large possibility of caking and has large surface density is obtained. The preparation method has the advantages of simplicity, uniform dispersion of sulfur and carbon, high carrying capacity and high utilization rate of elemental sulfur.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a lithium-sulfur battery elemental sulfur positive pole piece and a preparation method thereof, belonging to the field of electrochemical batteries. Background technique [0002] With the rapid development of society and the improvement of people's living standards, the energy crisis has become increasingly prominent, and the demand for diversified energy sources has become increasingly urgent. Clean chemical power sources represented by lithium batteries, especially secondary lithium-ion batteries, have been rapidly developed and applied, and play an indispensable role. The rapid development of portable electronic products such as iphones to aerospace vehicles represented by power and energy storage, electric vehicles, smart grids and energy storage power stations has put forward higher requirements for chemical power sources, especially lithium batteries: quality Light, small size, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134
CPCY02E60/122H01M4/13H01M4/139H01M4/362H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 李永郭瑞刘雯裴海娟解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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