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Metal-sulfur battery based on sulfur-rich transition metal sulfide and preparation method thereof

A transition metal and sulfur battery technology, applied in the field of energy storage, can solve the problems of high pollution, slow kinetic de-intercalation, low specific capacity, etc., and achieve the effects of improving electrical conductivity, superior battery performance, and preventing agglomeration

Active Publication Date: 2017-06-27
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this does not fundamentally solve the problem of polysulfide loss, it just slows down the process
At the same time, some studies have focused on sulfur-containing polymers. Although these sulfur-containing polymer materials can also inhibit the dissolution of polysulfides in the shuttle, they often have a relatively low specific capacity and a slow kinetic deintercalation speed. Moreover, it is inevitable to use highly polluting organic solvents in the synthesis method

Method used

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  • Metal-sulfur battery based on sulfur-rich transition metal sulfide and preparation method thereof
  • Metal-sulfur battery based on sulfur-rich transition metal sulfide and preparation method thereof
  • Metal-sulfur battery based on sulfur-rich transition metal sulfide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 MoS 3 / Preparation of CNT cathode material (acid hydrolysis method)

[0038] Material synthesis: Add 40 mL of an aqueous solution containing 1 mmol of ammonium tetrathiomolybdate to a 250 mL round-bottomed flask, and mix well under magnetic stirring; then add 40 mL of an aqueous solution containing 12 mg of dispersed carbon nanotubes, Thoroughly stirred for 20 min and supplemented with ultrasound for 10 min to form a uniform mixed solution. Under the condition of magnetic stirring, 1 mol / L dilute HCl was slowly added to the obtained mixed solution until the final pH value of the mixed solution was around 3. After continuing to fully react for two hours, transfer to a 50 mL centrifuge tube for centrifugation, wash with deionized water three times, and freeze-dry in liquid nitrogen for freeze-drying. The final black powder was annealed at 200°C for 2 h under the protection of Ar to form the final product. The mass ratio of transition metal sulfides and carbon...

Embodiment 2

[0045] Example 2 TiS 4 / Preparation of CNT cathode material (solid phase ball milling method)

[0046] Mix 0.176 g of carbon nanotubes, 0.48 g of titanium metal powder and 1.28 g of sulfur powder according to the set stoichiometric ratio, transfer them to a ball mill tank for evacuation for 2 h, and then place them in an Ar gas glove box for 12 h; After being assembled in the glove box, it was transferred to a ball mill for 80 h at a speed of 500 rpm. The final product TiS 4 / CNT, the mass ratio of transition metal sulfides and carbon-based materials is about 1:0.1.

[0047] Wherein, the preparation of the electrode and the assembly of the battery are the same as in Example 1, and the test interval is 1.5-3.0 V; the test results are shown in Image 6 . Depend on Image 6 It can be concluded that TiS 4 The / CNT electrode exhibits a working voltage of ~2.1 V and a specific capacity of ~860 mAh / g, demonstrating the excellent battery capacity of the disclosed metal-sulfur b...

Embodiment 3

[0048] Embodiment 3 CoS 5 / Preparation of CNT cathode material (liquid phase synthesis method)

[0049] Disperse 22 mg of carbon nanotubes uniformly in the aqueous solution, disperse uniformly with the aid of ultrasound, then add an aqueous solution containing 0.8 mmol cobalt sulfate, stir well, and then slowly add 1 mmol Na 2 S 4 Aqueous solution; After fully reacting for twelve hours, the final product CoS 5 / CNT, the mass ratio of transition metal sulfides and carbon-based materials is about 1:0.11.

[0050] Wherein, the preparation of the electrode and the assembly of the battery are the same as in Example 1, and the test range is 1.7-3.0 V. For the test results, see Figure 7 ,Depend on Figure 7 It can be concluded that CoS 5 The / CNT electrode exhibits a working voltage of ~1.9 V and a specific capacity of ~1100 mAh / g, demonstrating the excellent battery capacity of the metal-sulfur battery disclosed in this invention.

[0051] Figure 8 For the MoS synthesized und...

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Abstract

The invention discloses a metal-sulfur battery based on sulfur-rich transition metal sulfide and a preparation method thereof. The metal-sulfur battery comprises a cathode, an anode and an electrolyte; the anode is metal; the cathode comprises transition metal sulfide; a chemical formula of the transition metal sulfide is MSx, wherein x is more than or equal to 3; M is one or more of vanadium, niobium, titanium, molybdenum, tungsten, iron, cobalt and nickel; the metal is lithium, sodium, potassium, magnesium, aluminum, zinc or iron; the electrolyte is an ester-based electrolyte or an ether-based electrolyte. The metal-sulfur battery based on the sulfur-rich transition metal sulfide and the preparation method thereof, disclosed by the invention, have the benefits that transition metal polysulfide is adopted as a cathode material equivalent to sulfur so as to realize the novel metal-sulfur battery such as a lithium sulfur and sodium sulfur battery system, and further the application potential of the metal-sulfur battery is further improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a metal-sulfur battery based on a sulfur-rich transition metal sulfide and a preparation method thereof. Background technique [0002] With the development of lithium-ion batteries to large-scale fields such as electric vehicles, aviation, and military affairs, the performance indicators such as energy density and power density of lithium-ion batteries need to be further improved. However, limited by the theoretical specific capacity of lithium-ion battery electrode materials, even considering the use of higher specific capacity ternary positive electrode materials and silicon-carbon negative electrode materials, it is difficult to make the energy density of lithium-ion batteries reach 500 Wh kg -1 above. Among the next-generation energy storage secondary battery bodies currently being studied, lithium-sulfur batteries are known for their outstanding theoretic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/05H01M10/058
CPCH01M4/362H01M4/5815H01M4/625H01M10/05H01M10/058Y02E60/10Y02P70/50
Inventor 李彦光叶华林
Owner SUZHOU UNIV
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