A kind of porous hollow carbon material supporting metal phosphide, its preparation and application

A technology of loading metals and phosphides, which is applied in the direction of active material electrodes, positive electrodes, structural parts, etc., can solve the problems of poor rate and cycle performance, low capacity, poor conductivity, etc., and achieve long-term cycle stability and specificity. The effect of high surface area and high conductivity

Active Publication Date: 2021-10-15
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a porous hollow carbon material loaded with metal phosphides, its preparation and application, which first prepares a carbon sphere precursor by a template method, and then prepares a carbon sphere precursor in the carbon sphere precursor Load metal phosphide on the surface, and finally remove the template to prepare porous hollow carbon material to load metal phosphide, which is further loaded with sulfur and then used as anode material for lithium-sulfur batteries, thus solving the problem of poor conductivity and low capacity of existing lithium-sulfur battery cathode materials , technical problems of poor rate and cycle performance

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  • A kind of porous hollow carbon material supporting metal phosphide, its preparation and application
  • A kind of porous hollow carbon material supporting metal phosphide, its preparation and application
  • A kind of porous hollow carbon material supporting metal phosphide, its preparation and application

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[0044] The invention provides a method for preparing a porous hollow carbon material loaded with metal phosphides, comprising the following steps:

[0045] (1) A dispersion liquid of a carbon material precursor is prepared by a template method, and the carbon material precursor is a carbon material precursor coated with silica microspheres;

[0046] (2) mixing the dispersion of the carbon material precursor obtained in step (1) with the metal salt and the phosphorus source, after evaporating water and grinding, in an inert atmosphere, heat treatment to reduce the phosphorus source during the heat treatment, and combining with the metal in the metal salt to obtain a metal phosphide, which is loaded on the surface of the carbon material to obtain a carbon material supporting the metal phosphide;

[0047] (3) Etching and removing the silicon dioxide microspheres inside the metal phosphide-loaded carbon material obtained in step (2), to obtain a metal phosphide-loaded porous hollo...

Embodiment 1

[0065] A porous hollow carbon material loaded with metal phosphides, prepared according to the following method:

[0066] (1) Take 13 milliliters of ethyl orthosilicate, dissolve it in a mixed solvent of 350 milliliters of ethanol and 50 milliliters of water, stir for 1 minute, add 10 milliliters of concentrated ammonia water (25%), continue to stir for 5 minutes, and then add 2 grams of A solution of resorcinol and 2.8 ml of formaldehyde (37%) was stirred continuously for 12 hours. After centrifugation, washing and ultrasonic dispersion in water to form a uniform dispersion.

[0067] (2) Add 0.33 millimoles of ferric chloride and 3.3 millimoles of ammonium dihydrogen phosphate to the above-mentioned dispersion liquid, and then evaporate water from the dispersion liquid at 40 degrees Celsius. The obtained solid was ground and heat-treated at 700° C. for 3 hours under an argon atmosphere.

[0068] (3) Add the heat-treated material into 0.5 mol / L sodium hydroxide solution, tre...

Embodiment 2

[0074] A porous hollow carbon material loaded with metal phosphides, prepared according to the following method:

[0075] (1) Take 13 milliliters of ethyl orthosilicate, dissolve it in a mixed solvent of 35 milliliters of ethanol and 5 milliliters of water, stir for 2 minutes, add 12.5 milliliters of concentrated ammonia water (25%), continue to stir for 10 minutes, and then add 2 grams of A solution of resorcinol and 2.8 ml of formaldehyde (37%) was stirred continuously for 18 hours. After centrifugation, washing and ultrasonic dispersion in water to form a uniform dispersion.

[0076] (2) Add 0.66 millimoles of ruthenium chloride and 3.3 millimoles of ammonium dihydrogen phosphate to the above-mentioned dispersion liquid, and then evaporate water from the dispersion liquid at 50 degrees Celsius. The obtained solid was ground and heat-treated at 800° C. for 3 hours under a nitrogen atmosphere.

[0077] (3) Add the heat-treated material into 2 mol / L sodium hydroxide solution...

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Abstract

The invention belongs to the field of energy materials, and more specifically relates to a porous hollow carbon material loaded with metal phosphides, its preparation and application. First, the carbon sphere precursor is prepared by the template method, and then the metal phosphide is loaded on the surface of the carbon sphere precursor, and finally the template is removed to prepare the porous hollow carbon material to support the metal phosphide. The metal phosphide / hollow porous carbon sphere composite prepared by this method The material has high pore capacity and electrical conductivity, which can improve the poor conductivity and low capacity of the previous lithium-sulfur battery cathode materials. Moreover, the strong adsorption and interaction between transition metal phosphides and polysulfide ions suppresses the migration of polysulfide ions and significantly increases the conversion rate of polysulfide ions, which can effectively improve the rate and cycle performance of lithium-sulfur batteries.

Description

technical field [0001] The invention belongs to the field of energy materials, and more specifically relates to a porous hollow carbon material loaded with metal phosphides, its preparation and application. Background technique [0002] Lithium-sulfur batteries have the advantages of high theoretical specific energy (2600 Wh / kg), low cost, and wide range of sources, and their technical prospects are far superior to those of lithium-ion batteries currently used. representative, has received widespread attention. However, lithium-sulfur batteries still have many problems that make it difficult to take advantage of them. These problems are summarized as follows: (1) the low conductivity of sulfur and the discharge product lithium sulfide makes its electron transport difficult, the redox reaction is not complete, and the utilization rate of sulfur is very low; (2) the low lithium ion transport rate further The rate of battery reaction is reduced; (3) The slow kinetic process o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/5805H01M4/625H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 李箐马峰王谭源
Owner HUAZHONG UNIV OF SCI & TECH
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