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Multi-metal sulfide catalyst for lithium air battery and preparation method of multi-metal sulfide catalyst

A lithium-air battery and multiple metal technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of losing catalytic activity, reducing the discharge performance and cycle performance of lithium-air batteries, and achieve improved catalytic performance and flexible coating. The effect of controlling and reducing costs

Inactive Publication Date: 2018-09-07
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although CoS 2 Shows good catalytic activity in Li-air batteries, but it is easily oxidized to CoSO in humid air 4 ·H 2 o
Therefore using CoS 2 When used as a cathode catalyst, CoS during storage and cycling 2 It will be hydrated and gradually lose its catalytic activity, which greatly reduces the discharge performance and cycle performance of lithium-air batteries

Method used

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  • Multi-metal sulfide catalyst for lithium air battery and preparation method of multi-metal sulfide catalyst
  • Multi-metal sulfide catalyst for lithium air battery and preparation method of multi-metal sulfide catalyst
  • Multi-metal sulfide catalyst for lithium air battery and preparation method of multi-metal sulfide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Weigh 4.80g of Na respectively 2 S·9H 2 O and 0.64g of S, then put it into deionized water, and keep it at 90°C for 1h to obtain solution A.

[0047] (2) Weigh 4.50g of CoSO 4 ·7H 2 O and 1.11 g FeSO 4 ·7H 2 O, it was dissolved in deionized water, and 4.80 g of Na 2 S·9H 2 O, solid-liquid separation to obtain precursor B.

[0048] (3) Add all the precursors B obtained in the solution A obtained in (1) and (2) to the reactor, adjust the pH of the mixed solution to 4 and control the mass ratio of the water in the precursor B and the reaction solution to be 2.25:100, then seal the reaction kettle, heat it to 180°C for hydrothermal reaction for 18h, wait for it to cool naturally to room temperature and then filter, the obtained solid is washed and dried in vacuum, which is the crude product.

[0049] (4) Place the crude product obtained in (3) in an argon atmosphere, and keep it at 500°C for 6h to obtain Co 0.8 Fe 0.2 S 2 Material.

[0050] (5) Weigh 1.22g o...

Embodiment 2

[0054] (1) Prepare more than 10g of Co according to the method of Example 1 0.8 Fe 0.2 S 2 Material.

[0055] (2) Weigh 2.57g of FeSO 4 ·7H 2 O and 2.22 g of Na 2 S·9H 2 O, which was dissolved in deionized water in turn, and the solid-liquid separation obtained the precursor C.

[0056] (3) Weigh 2.22g of Na respectively 2 S·9H 2 O and 0.64 g of S were sequentially dissolved in deionized water, followed by incubation at 90° C. for 1 h to obtain solution D.

[0057] (4) Co prepared in solution D and 10g step (1) 0.8 Fe 0.2 S 2 Add to precursor C, mix well to obtain suspension E. Transfer the suspension E to the reaction kettle, adjust its pH to 8 and control the mass ratio of precursor C and water in the reaction solution to 1.05:100, then seal the reaction kettle, heat it to 170°C for hydrothermal reaction for 18 hours, and wait for it to Naturally cooled to room temperature and filtered, the resulting solid was washed and vacuum-dried, which was 10wt% FeS 2 Coat...

Embodiment 3

[0059] (1) Weigh 2.40g of Na respectively 2 S·9H 2 O and 0.64g of S were put into deionized water and kept at 100°C for 0.5h to obtain solution A.

[0060] (2) Weigh 1.97g of CoSO 4 ·7H 2 O and 0.83g FeSO 4 ·7H 2 O, it was dissolved in deionized water, and 2.88 g of Na 2 S·9H 2 O, solid-liquid separation to obtain precursor B.

[0061] (3) Add solution A obtained in (1) and precursor B obtained in (2) to the reactor, adjust the pH of the mixed solution to 3 and control the mass ratio of precursor B and water in the reaction solution to 1.13 : 100, then sealed the reaction kettle, heated to 160 ℃ hydrothermal reaction for 36h, after it was naturally cooled to room temperature, filtered, the obtained solid was washed and vacuum-dried, which was the crude product.

[0062] (4) Place the crude product obtained in (3) in an argon atmosphere, and keep it at 510°C for 5h to obtain Co 0.7 Fe 0.3 S 2 Material.

[0063] (5) Weigh 1.22g of FeSO 4 ·7H 2 O and 1.05g Na 2 S·9...

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Abstract

The invention relates to a multi-metal sulfide catalyst for a lithium air battery and a preparation method of the multi-metal sulfide catalyst. A structural formula of the multi-metal sulfide catalystis FeS2@CoxFe1-xS2, wherein x is greater than or equal to 0.5 and is smaller than or equal to 0.8, a mass ratio of FeS2 to coated CoxFe1-xS2 is y:(1-y), and y is greater than or equal to 0.05 and issmaller than or equal to 0.1. According to the multi-metal sulfide catalyst disclosed by the invention, through a synergistic effect of coating and doping, the air stability of a CoS2 material can beremarkably improved, so that the catalytic performance of the multi-metal sulfide catalyst can be improved; through introduction of a Fe element, the using amount of a precious metal element Co can also be reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-air batteries, in particular to a multi-element metal sulfide catalyst for lithium-air batteries and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, it is becoming more and more urgent to find new energy systems with environmental protection and high energy density to meet the needs of social development. In recent years, lithium-air batteries have attracted extensive attention due to their high theoretical energy density. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are two important reactions that occur on the air electrode during charging and discharging of lithium-air batteries. Low discharge efficiency and poor cycle performance. One of the effective ways to solve the above problems is to use highly efficient and bifunctional catalysts to increase the reaction rate of ORR and OER, thereby improving the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/88H01M4/90
CPCH01M4/5815H01M4/88H01M4/90Y02E60/10Y02E60/50
Inventor 余志勇陈康余天浪杨波杨吉蒿继深刘韩星
Owner WUHAN UNIV OF TECH
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