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Porous nickel-cobalt bimetallic phosphide nanosheet for lithium-sulfur battery, modified diaphragm and preparation method of porous nickel-cobalt bimetallic phosphide nanosheet

A bimetallic nanometer and lithium-sulfur battery technology, applied in the direction of phosphides, phosphorus compounds, chemical instruments and methods, etc., can solve the problems of difficult balance of catalysis and adsorption characteristics, achieve the suppression of shuttle effect, simple material synthesis method, accelerated The effect of the conversion reaction

Pending Publication Date: 2021-08-06
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers have reported that metal-organic framework (MOF), nano-metal oxides, double metal hydroxides, MXene, etc. are used to modify the diaphragm, but most of these materials are equilibrium substances, and the catalytic and adsorption properties are difficult to achieve balance. Urgent need to further improve

Method used

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  • Porous nickel-cobalt bimetallic phosphide nanosheet for lithium-sulfur battery, modified diaphragm and preparation method of porous nickel-cobalt bimetallic phosphide nanosheet
  • Porous nickel-cobalt bimetallic phosphide nanosheet for lithium-sulfur battery, modified diaphragm and preparation method of porous nickel-cobalt bimetallic phosphide nanosheet
  • Porous nickel-cobalt bimetallic phosphide nanosheet for lithium-sulfur battery, modified diaphragm and preparation method of porous nickel-cobalt bimetallic phosphide nanosheet

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preparation example Construction

[0028] A method for preparing porous nickel-cobalt double metal phosphide nanosheets for lithium-sulfur batteries, comprising the following steps:

[0029] Step 1: Dissolve nickel salt and cobalt salt in deionized water, stir for 1-100min to obtain solution A, dissolve complexing agent in anhydrous methanol and stir for 1-100min to obtain solution B; Add 1.73-2.6g of a mixture of nickel salt and cobalt salt to deionized water; add 1.97g of complexing agent per 1-100mL of anhydrous methanol, and the volume ratio of solution A to solution B is (0.2-11):1. The mass ratio of described nickel salt and cobalt salt is (1~3): 1, and described nickel salt is the one in nickel nitrate, nickel chloride, nickel sulfate; Described cobalt salt adopts cobalt nitrate, chloride One of cobalt and cobalt sulfate, and the complexing agent is one of 1-methylimidazole, 2-methylimidazole and N-methylimidazole.

[0030] Step 2: Add solution B to solution A, please add the limit for the volume relati...

Embodiment 1

[0037] (1) Weigh 1.30 g of nickel nitrate hexahydrate and 1.30 g of cobalt nitrate hexahydrate, mix and dissolve in 30 ml of deionized water, and stir for 1 min to form solution A. Dissolve 1.97g of 2-methylimidazole in 70ml of anhydrous methanol and stir for 1min to form solution B. Quickly pour solution B into solution A, stir for 1 min to obtain solution C, let it stand at room temperature for 1 hour, after standing, wash solution C with deionized water and suction filter, and finally freeze-dry the precipitate for 48 hours to obtain a light green powder That is, the porous bimetal nanosheet precursor is obtained after drying.

[0038] (2) Under an inert atmosphere, the precursor and sodium hypophosphite were arranged in sequence at 320° C. for low temperature annealing at a mass ratio of 1:10, and the annealing time was 1 h to obtain the porous bimetallic phosphide nanosheets.

[0039] (3) Weigh and mix porous bimetallic phosphide nanosheets and polyvinylidene fluoride in...

Embodiment 2

[0044] (1) Weigh 1.30 g of nickel chloride and 0.65 g of cobalt chloride, mix and dissolve them in 20 ml of deionized water, and stir for 100 min to form solution A. Dissolve 1.97g of 1-methylimidazole in 100ml of anhydrous methanol and stir for 100min to form solution B. Quickly pour solution B into solution A, stir for 30 minutes to obtain solution C, let it stand at room temperature for 24 hours, after standing, wash and filter solution C with deionized water, and finally freeze-dry the precipitate for 48 hours to obtain a light green powder That is, the porous bimetal nanosheet precursor is obtained after drying.

[0045] (2) Under an inert atmosphere, the precursor and sodium hypophosphite were arranged in sequence at 400° C. for a low-temperature annealing at a mass ratio of 10:1, and the annealing time was 8 hours to obtain the porous bimetallic phosphide nanosheets.

[0046] (3) coating diaphragm according to the method of example 1, difference is to use polyethylene ...

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Abstract

The invention discloses a porous nickel-cobalt bimetallic phosphide nanosheet for a lithium-sulfur battery, a modified diaphragm and a preparation method of the porous nickel-cobalt bimetallic phosphide nanosheet. The preparation method of the porous nickel-cobalt bimetallic phosphide nanosheet comprises the following steps: reacting nickel salt, cobalt salt and a complexing agent in a water / alcohol solution to obtain a porous bimetallic phosphide nanosheet precursor, and then in an inert atmosphere, carrying out low-temperature annealing on the precursor and sodium hypophosphite to obtain the porous nickel-cobalt bimetallic phosphide nanosheet. The surface of the diaphragm for the lithium-sulfur battery is coated with the material, so that the conversion reaction of polysulfide can be catalyzed, shuttling of the polysulfide can be effectively inhibited, and the electrochemical performance of the lithium-sulfur battery is effectively improved.

Description

technical field [0001] The invention relates to nanomaterials and their applications in batteries, in particular to a porous nickel-cobalt double-metal phosphide nanosheet for lithium-sulfur batteries, a modified diaphragm and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g -1 ) and energy density (2600Wh kg -1 ), its cathode active material sulfur has the advantages of low cost, abundant reserves, and wide sources, and is considered to be an ideal product to meet the needs of large-scale energy storage systems in the future. However, the practical application of lithium-sulfur batteries at this stage faces the following difficulties: 1. Elemental sulfur itself is insulating; 2. Sulfur itself produces serious volume expansion during the reaction process; 3. Lithium polysulfide (LiPSs), an intermediate product of the reaction, is easy to dissolve , Shuttle, resulting in the loss of act...

Claims

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Application Information

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IPC IPC(8): C01B25/08H01M50/431H01M50/451B82Y40/00B82Y30/00
CPCC01B25/088B82Y40/00B82Y30/00C01P2004/24
Inventor 王晓飞刘海星裴晨晨原晓艳霍京浩刘毅赵丹郭守武
Owner SHAANXI UNIV OF SCI & TECH
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