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
CN110444745BActive Publication Date: 2021-10-15HUAZHONG UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2021-10-15

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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.
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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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