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An amorphous phase molybdenum trisulfide cathode material of a lithium sulfide battery and a preparation method thereof

A molybdenum trisulfide and cathode material technology, which is applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of reducing sulfide shuttle, cycle performance, and difficulty in dissolving, and achieves easy industrial development and structure. and stable performance, reducing the effect of shuttle

Inactive Publication Date: 2019-01-08
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of reduced cycle performance caused by the large shuttle effect of the existing lithium-sulfur battery positive electrode materials, the present invention proposes an amorphous phase molybdenum trisulfide positive electrode material for lithium-sulfur batteries and a preparation method, through which the amorphous phase molybdenum trisulfide In the process of recombining with lithium ions, the S-S bond is broken to form short-chain low-sulfides that are not easily soluble in the electrolyte, thereby reducing the shuttle of sulfides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 10 parts by mass of ammonium tetrathiomolybdate, 16 parts by mass of dilute hydrochloric acid, 2 parts by mass of ethylenediamine, 45 parts by mass of porous carbon spheres and an appropriate amount of deionized water;

[0029] (2) Dissolve the ammonium tetrathiomolybdate in an appropriate amount of deionized water, set the stirring speed at 100rpm, control the dissolution temperature at 60°C, and stir fully until the ammonium tetrathiomolybdate is completely dissolved, and the configuration concentration is 1.3mol / L of solution A, then pour solution A into a flask filled with a dispersant to obtain a precursor solution;

[0030] (3) Add dilute hydrochloric acid dropwise to the precursor solution, control the drop rate to 50 μL / min, adjust the pH value to an acidic range of 3.0-5.5, use porous carbon spheres for adsorption, let stand for 30 hours, and then set up evaporation The temperature is 67°C, evaporated for 6 hours, and the heating rate during the evap...

Embodiment 2

[0034] (1) Weigh 8 parts by mass of ammonium tetrathiomolybdate, 19 parts by mass of dilute hydrochloric acid, 0.1 parts by mass of pyrrolidone, 30 parts by mass of porous carbon spheres and an appropriate amount of deionized water;

[0035] (2) Dissolve the ammonium tetrathiomolybdate in an appropriate amount of deionized water, set the stirring speed at 70rpm, control the dissolution temperature at 40°C, and stir fully until the ammonium tetrathiomolybdate is completely dissolved, and the configuration concentration is 1.4mol / L of solution A, then pour solution A into a flask filled with a dispersant to obtain a precursor solution;

[0036] (3) Add dilute hydrochloric acid dropwise to the precursor solution, control the drop rate to 80 μL / min, adjust the pH value to an acidic range of 3.0-5.5, use porous hollow carbon spheres for adsorption, let stand for 36 hours, and then set The evaporation temperature is 50°C, evaporated for 9 hours, and the heating rate during the evap...

Embodiment 3

[0040] (1) Weigh 12 parts by mass of ammonium tetrathiomolybdate, 16 parts by mass of dilute hydrochloric acid, 0.7 parts by mass of dimethyl sulfoxide, 35 parts by mass of porous carbon spheres and an appropriate amount of deionized water;

[0041] (2) Dissolve the ammonium tetrathiomolybdate in an appropriate amount of deionized water, set the stirring speed at 70rpm, control the dissolution temperature at 45°C, and stir fully until the ammonium tetrathiomolybdate is completely dissolved, and the configuration concentration is 1.3mol / L of solution A, then pour solution A into a flask filled with a dispersant to obtain a precursor solution;

[0042] (3) Add dilute hydrochloric acid dropwise to the precursor solution, control the drop rate to 40 μL / min, adjust the pH value to an acidic range of 3.0-5.5, use porous carbon spheres for adsorption, let stand for 17 hours, and then set up evaporation The temperature is 60°C, evaporated for 7 hours, and the heating rate during the ...

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Abstract

The invention provides an amorphous phase molybdenum trisulfide cathode material of a lithium sulfide battery and a preparation method thereof. Ammonium tetrathiomolybdate is added into deionized aqueous solution, PH is adjusted to acidity, porous carbon spheres are used for adsorption and evaporation drying solvent, the adsorbed carbon spheres are calcined in hydrogen / argon atmosphere, and annealed after calcination to obtain carbon-coated amorphous molybdenum trisulfide cathode material. The invention adopts porous hollow carbon sphere to adsorb thiomolybdate ion and calcine at high temperature, the thiomolybdate salt inside is converted into amorphous phase molybdenum trisulfide, in the process of recombination with lithium ions, S-S bond of amorphous phase molybdenum trisulfider ruptures to form short chain low sulfide and lithium composite which is not easy to dissolve in the electrolyte, thus reducing the shuttle of sulfide and overcoming the problem of cycle performance degradation caused by the large shuttle effect of the existing cathode materials of lithium-sulfide batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an amorphous phase molybdenum trisulfide positive electrode material for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently the battery system with the best performance among commercial secondary batteries, but due to their main use, the theoretical capacity generally does not exceed 300mAhg -1 LiFeO 4 、LiCoO 2 and LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 As cathode materials, it is difficult to meet the current demand for high specific energy batteries, and the development of cathode materials with high theoretical specific capacity has become the focus of current research. [0003] Lithium-sulfur batteries have a very high theoretical capacity, and the theoretical specific capacity of the material and the theoretical specific energy of the battery reach 1672m Ah·g, respectively. -1 and 2600Wh·kg -1 A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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