Magnesium-sulfur battery, transition metal sulfide/sulfur composite positive electrode material and composite method

A composite cathode material, transition metal technology, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problem that the cycle performance of magnesium-sulfur batteries is difficult to obtain a large improvement, reduce the energy density of magnesium-sulfur batteries, and cannot suppress the shuttle effect, etc. problem, to achieve the effect of inhibiting the shuttle effect, increasing the cycle stability, high electronic conductivity and electrochemical activity

Pending Publication Date: 2020-12-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of carbon materials reduces the capacity of the composite positive electrode, increases the amount of electrolyte used, and reduces the overall energy density of the magnesium-sulfur battery.
In addition, carbon materials have limited adsorption capacity for polysulfide ions and cannot inhibit the shuttle effect, so it is difficult to greatly improve the cycle performance of magnesium-sulfur batteries.
The capacity retention of most S / C composite cathode materials is less than 50% within 100 cycles, the overall capacity of the cathode is generally lower than 200mA h / g, and the capacity utilization of sulfur is low (less than 400mA h / g)

Method used

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  • Magnesium-sulfur battery, transition metal sulfide/sulfur composite positive electrode material and composite method
  • Magnesium-sulfur battery, transition metal sulfide/sulfur composite positive electrode material and composite method
  • Magnesium-sulfur battery, transition metal sulfide/sulfur composite positive electrode material and composite method

Examples

Experimental program
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Effect test

Embodiment 1

[0053] This embodiment provides a Mo 6 S 8 / S composite cathode material preparation and performance testing.

[0054] (1)Mo 6 S 8 Synthesis: Take molybdenum disulfide, copper sulfide, and molybdenum powder with a molar ratio of 3:2:3, ball mill for 0.5h, and then in 10 6 Press down into granules and put them into a sealed stainless steel tube; raise the temperature to 900 degrees Celsius at a rate of 2 degrees Celsius per minute in argon, keep it for 24 hours and then cool down naturally to obtain Cu 2 Mo 6 S 8 . Then it was placed in 6 molar HCl for 12 hours with oxygen to remove Cu. The product was washed with water and dried in a vacuum oven at 100 degrees Celsius for 12 hours to obtain Mo 6 S 8 .

[0055] (2)Mo 6 S 8 / S composite material preparation: weigh 1g Mo 6 S 8 , 0.1g of precipitated sulfur, 1g of graphene, 1g of Ketjen black, placed in a ball mill jar, sealed and ball milled for 1 hour to obtain Mo 6 S 8 / S Composite.

[0056] (3) Weigh Mo respec...

Embodiment 2

[0060] This embodiment provides a Mo 6 S 8 / S composite cathode material preparation and performance testing.

[0061] (1)Mo 6 S 8 Synthesis: Take molybdenum disulfide, copper sulfide, and molybdenum powder with a molar ratio of 3:2:3, ball mill for 0.5h, and then in 10 6 Press down into granules and put them into a sealed stainless steel tube; raise the temperature to 900 degrees Celsius at a rate of 2 degrees Celsius per minute in argon, keep it for 24 hours and then cool down naturally to obtain Cu 2 Mo 6 S 8 . Then it was placed in 6 molar HCl for 12 hours with oxygen to remove Cu. The product was washed with water and dried in a vacuum oven at 100°C for 12 hours to obtain Mo 6 S 8 .

[0062] (2)Mo 6 S 8 / S composite material preparation: weigh 1gMo 6 S 8 , 0.1g carbon nanotubes, 0.1g acetylene black, put in a ball mill jar, add 20mL water and 20mL ethanol, seal the ball mill for 1 hour; then dissolve 0.5g sodium thiosulfate in it, then slowly add 0.5 mole H ...

Embodiment 3

[0066] This embodiment provides a TiS 2 / S composite cathode material preparation and performance testing.

[0067] (1)TiS 2 / S composite material preparation: weigh 1g TiS 2 , 1g of precipitated sulfur, 0.7g of graphene, and 0.7g of Ketjen black were placed in a ball mill jar, sealed and ball milled for 24 hours to obtain TiS 2 / S Composite.

[0068] (2) Weigh TiS with a mass ratio of 7:1:1:1 2 / S composite material, Super-P carbon black, carbon nanotubes, polyacrylic acid, ground evenly, rolled into a film, and dried to obtain the positive electrode sheet. The content of the active substance is 2mg / cm 2 .

[0069] (3) In a glove box filled with argon, the positive electrode sheet, magnesium foil, and 0.03 mole of MgCl 2 -AlCl 3 -Mg(TFSI) 2 Dissolved in tetrahydrofuran electrolyte to assemble a soft pack battery. And the battery at 0.2-2.5Vvs.Mg / Mg 2+ Electrochemical tests were carried out in the range. The capacity test results are shown in Table 1.

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Abstract

The invention discloses a magnesium-sulfur battery, a transition metal sulfide/sulfur composite positive electrode material and a composite method. The magnesium-sulfur battery comprises a positive electrode containing a transition metal sulfide/sulfur composite positive electrode material, a magnesium ion electrolytic solution and a magnesium metal negative electrode, wherein in the transition metal sulfide/sulfur composite positive electrode material, the transition metal sulfide is MxSy, M is a cation and comprises one or more of Mo, Ti, Cu, Co, V, Fe, Cr, Ni, Mn, Zn, Sc, Nb, Mo, Zr, W, Reand Ta, wherein x is greater than or equal to 1 and less than or equal to 9, y is greater than or equal to 1 and less than or equal to 9, the values of x and y meet the requirement of keeping the compound electrically neutral, the sulfur source comprises one or more of elemental sulfur, MgS and magnesium polysulfide MgSz, z is greater than 1 and less than or equal to 4, and the mass percent of sulfur is 5-95%.

Description

technical field [0001] The invention relates to the technical field of novel batteries, in particular to a magnesium-sulfur battery, a transition metal sulfide / sulfur composite cathode material and a composite method. Background technique [0002] With the society's demand for green energy, lithium-ion batteries have gradually become the mainstream power source for mobile electronic devices and electric vehicles. After years of development, the energy density of lithium-ion batteries is gradually approaching the theoretical limit of embedded chemistry, and its capacity and energy density are difficult to obtain a major improvement. The metal secondary battery can combine the metal negative electrode and the positive electrode material, benefiting from the high capacity and low potential of the metal negative electrode, which can further increase the energy density of the battery. Among all metal negative electrodes, magnesium metal has a high capacity (especially the volume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M4/62H01M10/05
CPCH01M4/364H01M4/38H01M4/5815H01M4/62H01M4/624H01M4/625H01M4/628H01M10/05Y02E60/10
Inventor 索鎏敏毛明磊李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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