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Sulfur/sulfide/copper ternary composite cathode and preparation and application thereof in magnesium-sulfur battery

A ternary compound, sulfide technology, applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problem of reducing the polarization potential of battery charging, and achieve high rate performance, high Coulomb efficiency, and good capacity retention rate. Effect

Active Publication Date: 2017-07-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The innovations of this patent are as follows: 1) Sulfide (MS) has excellent electrical conductivity, which can improve the electronic conductivity of sulfur / sulfide composites; 2) The addition of metal sulfide can effectively inhibit the polysulfide shuttle effect; 3) Metal Copper foil dissolves in the electrolyte during charge and discharge and reacts with polysulfides to form non-stoichiometric copper sulfide (Cu x S,0x ≤2) mesophase, which can effectively activate MgS or MgS 2 Further charging process to increase the conversion reaction rate can significantly reduce the charging polarization potential of the battery (<0.4 V vs. Mg) in the subsequent charging process; 3) Sulfur / sulfide / copper ternary composite material as a magnesium-sulfur battery Cathode materials have not yet been publicly reported

Method used

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  • Sulfur/sulfide/copper ternary composite cathode and preparation and application thereof in magnesium-sulfur battery
  • Sulfur/sulfide/copper ternary composite cathode and preparation and application thereof in magnesium-sulfur battery
  • Sulfur/sulfide/copper ternary composite cathode and preparation and application thereof in magnesium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1.0 g of tin disulfide with an electronic balance, and then weigh 2.0 g-8.0 g of sublimated sulfur powder and place it in an agate ball mill jar filled with 10 mL of ethanol for ball milling for 8 h (preferably 4.0 g of sublimated sulfur). Volatilize and remove to obtain sulfur / tin disulfide composite material. Place the dried sulfur / tin disulfide in a closed stainless steel-lined reactor at 150-160 °C for 12-36 h (preferably 155 °C, 24 h).

[0028] The sulfur / tin disulfide composite material, super P carbon black, and polyacrylic acid (PAA) were weighed at a mass ratio of 80:10:10 to prepare a uniformly dispersed slurry by grinding, and coated with copper foil and dried to obtain the positive electrode. piece.

[0029] In a glove box filled with argon gas, the pole piece was used as the positive pole piece of the assembled battery, the magnesium piece was used as the negative pole piece, 0.05mol / L magnesium fluoride and 0.2 mol / L tris(hexafluoroisopropyl) borate...

Embodiment 2

[0031]Weigh 1.0 g of tin disulfide by electronic balance and place it in a beaker filled with 50 mL of deionized water and 10 mL of ethanol to obtain A by ultrasonication. Weigh 2.0g-8.0g of sublimated sulfur powder and place it in a beaker filled with 50mL of ethylenediamine to obtain B by ultrasonication. Slowly add A to B and add acid to adjust the pH to neutral or slightly acidic. Filter and dry to obtain sulfur / tin disulfide composite material. Preferably the sublimed sulfur is 4.0 g.

[0032] The sulfur / tin disulfide composite material, super P carbon black, and polyacrylic acid (PAA) were weighed at a mass ratio of 80:10:10 to prepare a uniformly dispersed slurry by grinding, and coated with copper foil and dried to obtain the positive electrode. piece.

[0033] In a glove box filled with argon gas, the pole piece was used as the positive pole piece of the assembled battery, the magnesium piece was used as the negative pole piece, 0.05mol / L magnesium fluoride and 0.2...

Embodiment 3

[0039] Weigh 1.0 g of iron disulfide with an electronic balance, and then weigh 2.0 g-8.0 g of sublimed sulfur powder and place it in an agate ball mill jar filled with 10 mL of ethanol for ball milling for 8 h (preferably 4.0 g of sublimed sulfur). Volatilize and remove to obtain sulfur / iron disulfide composite material. Place the dried sulfur / iron disulfide in a closed stainless steel-lined reactor at 150-160 °C for 12-36 h (preferably 155 °C, 24 h).

[0040] The sulfur / iron disulfide composite material, Super P carbon black, and polyacrylic acid (PAA) were weighed at a mass ratio of 80:10:10 to prepare a uniformly dispersed slurry by grinding, and coated with copper foil and dried to obtain the positive electrode. piece.

[0041] In a glove box filled with argon gas, the pole piece was used as the positive pole piece of the assembled battery, the magnesium piece was used as the negative pole piece, 0.05mol / L magnesium fluoride and 0.2 mol / L tris(hexafluoroisopropyl) borate...

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Abstract

The invention relates to the technical field of magnesium batteries, and discloses preparation and application of a sulfur / sulfide / copper ternary composite cathode in a magnesium-sulfur battery. The sulfur / sulfide / copper ternary composite cathode comprises sublimation sulfur, metal sulfide and metal copper foil. Meanwhile, the magnesium-sulfur battery is assembled by the sulfur / sulfide / copper ternary composite cathode, a magnesium ion electrolyte and a metal magnesium anode. The composite cathode not only can effectively bind polysulfide ions to the cathode region, thus suppressing a 'shuttle effect', but also generate a non-stoichiometric copper sulfide (CuxS, x<=2) interphase by means of dissolution of the metal copper foil, thus promoting the electrochemical conversion reaction of a discharging product MgS, significantly improving the charge and discharge capacity of the battery and improving the cycling stability of the magnesium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of new batteries, and in particular relates to the preparation of a sulfur / sulfide / copper ternary composite cathode material and its application in magnesium-sulfur batteries. Background technique [0002] The rapid development of the miniaturization of electronic products, electric vehicles and space technology has greatly promoted the development of new generation battery technology with high energy density, long cycle life, low cost and safe operation. Lithium-ion secondary batteries are limited by the theoretical capacity of the positive electrode material (the commonly used lithium-ion battery positive electrode material LiFePO 4 , LiMn 2 o 4 、LiCoO 2 The theoretical capacities are 170 mAh / g, 148 mAh / g, and 274 mAh / g, respectively. ), the density is far from meeting the requirements of the development of the times. Secondly, when the lithium-ion battery is used improperly, the dendrites generated o...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/13H01M4/139H01M4/362H01M4/38H01M4/624H01M4/628H01M10/054H01M2004/028Y02E60/10
Inventor 崔光磊付林许慧敏张忠华徐红霞王晓刚
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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