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Magnesium aluminum pentafluoride/nitrogen-doped carbon lithium-sulfur battery positive electrode material and preparation method thereof

A pentafluoro-magnesium-aluminum, positive electrode material technology, applied in battery electrodes, lithium storage batteries, positive electrodes and other directions, can solve the problems of poor conductivity of sulfur and lithium-sulfur products, cumbersome process, low utilization rate, etc., to improve cycle stability, The preparation process is simple and the effect of providing sulfur-carrying space

Active Publication Date: 2020-06-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems in the practical application of lithium-sulfur batteries: (1) the poor conductivity of sulfur and lithium-sulfur products; (2) the volume expansion of nearly 80% during cycling; (3) the intermediate polysulfide (Li 2 S x ,4≤x≤8) Dissolution and shuttle effect during charge and discharge; (4) Soluble Li 2 S 4 to solid state Li 2 The kinetics of the liquid-solid phase transition of S are slow, resulting in low utilization of S
[0004] Chinese patent CN108649194A discloses a graphene-loaded molybdenum disulfide lithium-sulfur battery positive electrode material and its preparation method. The above-mentioned positive electrode material has low sulfur loading on microporous carbon, high cost of graphene and carbon nanotubes, and cumbersome assembly process of metal compounds. High cost, difficult to achieve mass production, and stable assembly of metal compounds on carbon materials (especially graphene and carbon nanotubes with fewer defects) is also a challenge
Chinese patent CN109546098A discloses a reduced graphene oxide loaded ReS for lithium-sulfur battery cathode material 2 The preparation method of ReS 2 As a transition metal sulfide, it is a polar material, in which S can form a bond with Li in lithium polysulfide, and Re can also form a bond with S in lithium polysulfide to achieve a strong chemical adsorption on lithium polysulfide , effectively inhibit its dissolution and diffusion in the electrolyte, and improve the stability of the electrochemical cycle, but the above-mentioned scheme also has the problems of cumbersome process, high cost, and difficulty in mass production, and the specific capacity of the battery needs to be further improved

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  • Magnesium aluminum pentafluoride/nitrogen-doped carbon lithium-sulfur battery positive electrode material and preparation method thereof
  • Magnesium aluminum pentafluoride/nitrogen-doped carbon lithium-sulfur battery positive electrode material and preparation method thereof
  • Magnesium aluminum pentafluoride/nitrogen-doped carbon lithium-sulfur battery positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0048] (1) Treatment of attapulgite

[0049] The natural attapulgite was screened with a 200-mesh sieve, and then 6 g of attapulgite was put into 200 mL of hydrochloric acid with a concentration of 4 mol / L, and heated and stirred at 90 ° C for 2 h. Then carry out suction filtration, the product obtained after suction filtration is washed to neutrality, and then the obtained sample is placed in a vacuum drying oven to dry for 12 hours.

[0050] (2) Attapulgite-coated nitrogen-doped carbon

[0051] Weigh the above-mentioned 2g of modified attapulgite, 1.5g of glucose and 0.9g of ammonium chloride into a 100mL beaker, add 40mL of deionized water and continue stirring for 24h, and then put it in a water bath at 80°C until the water is evaporated to obtain the precursor. The above precursor was calcined in a tube furnace under an argon atmosphere at a heating rate of 4°C / min, and calcined at 600°C for 3h to obtain a nitrogen-doped carbon-coated attapulgite composite.

[0052] (3)...

Embodiment 2

[0059] (1) Treatment of attapulgite

[0060] The natural attapulgite was screened with a 200-mesh sieve, and then 6 g of attapulgite was put into 200 mL of hydrochloric acid with a concentration of 6 mol / L, and heated and stirred at 70 ° C for 4 h. Then carry out suction filtration, the product obtained after suction filtration is washed to neutrality, and then the obtained sample is placed in a vacuum drying oven to dry for 12 hours.

[0061] (2) Attapulgite-coated nitrogen-doped carbon

[0062] Weigh the above 2g of modified attapulgite, 1.5g of glucose and 1.35g of ammonium chloride into a 100mL beaker, add 40mL of deionized water and continue to stir for 24h, and then put it in a water bath at 80°C until the water is evaporated to obtain the precursor. The above precursor was calcined in a tube furnace under an argon atmosphere at a heating rate of 6°C / min, and calcined at 900°C for 7h to obtain a nitrogen-doped carbon-coated attapulgite composite.

[0063] (3) HF treatm...

Embodiment 3

[0072] (1) Treatment of attapulgite

[0073] The natural attapulgite was screened with a 200-mesh sieve, and then 6 g of attapulgite was put into 200 mL of hydrochloric acid with a concentration of 6 mol / L, and heated and stirred at 80 ° C for 3 h. Then carry out suction filtration, the product obtained after suction filtration is washed to neutrality, and then the obtained sample is placed in a vacuum drying oven to dry for 12 hours.

[0074] (2) Attapulgite-coated nitrogen-doped carbon

[0075] Weigh the above-mentioned 2g of modified attapulgite, 2g of glucose and 1.2g of ammonium chloride into a 100mL beaker, add 40mL of deionized water and keep stirring for 24h, and then put it in a water bath at 80°C until the water is evaporated to obtain the precursor. The above precursor was calcined in a tube furnace under an argon atmosphere at a heating rate of 5°C / min, and calcined at 800°C for 5h to obtain a nitrogen-doped carbon-coated attapulgite composite.

[0076] (3) HF tr...

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Abstract

The invention provides a magnesium aluminum pentafluoride / nitrogen-doped carbon lithium-sulfur battery positive electrode material and a preparation method thereof. The method comprises the steps of carrying out acid modification treatment on attapulgite, uniformly mixing with glucose and ammonium chloride, evaporating to dryness, calcining to obtain nitrogen-doped carbon-coated attapulgite, treating with hydrofluoric acid to obtain magnesium aluminum pentafluoride / nitrogen-doped carbon, and carrying out sulfur loading to obtain a magnesium aluminum pentafluoride / nitrogen-doped carbon sulfur-loaded composite material; and mixing the obtained composite material with a conductive agent and a binder in a solvent, coating the mixture on a current collector, and drying to obtain the magnesium aluminum pentafluoride / nitrogen-doped carbon lithium-sulfur battery positive electrode material. The nitrogen-doped carbon amorphous carbon tube in the obtained positive electrode material has a confinement effect on polysulfide, the magnesium aluminum pentafluoride loaded on the inner surface and the outer surface of the amorphous carbon tube has an adsorption effect on polysulfide, a shuttling effect of the polysulfide can be effectively inhibited through the synergistic effect of the magnesium aluminum pentafluoride and the polysulfide, and the electrochemical performance of the lithium-sulfur battery is improved. The preparation method provided by the invention is simple and convenient in process, low in cost and good in industrialization prospect.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a magnesium aluminum pentafluoride / nitrogen-doped carbon lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the increasing demand for renewable energy, batteries with high energy density have received extensive attention from both academia and industry. Among many battery technologies, lithium-sulfur batteries have a high theoretical specific capacity (up to 1675mAh g -1 ), the battery energy density and volume density are as high as 2600Wh kg -1 with 2800W h L -1 , is more than five times that of other embedded cathode materials, and the cruising range of electric vehicles is theoretically greater than 400km. Moreover, the earth is rich in sulfur resources and is environmentally friendly. However, there are still many problems in the practical application of lithium-sulfur batteries: (1) the poor conductivity of su...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/38H01M4/62H01M10/052
CPCH01M4/139H01M4/38H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 唐爱东张士林杨华明
Owner CENT SOUTH UNIV
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