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A kind of preparation method and application of graphene composite metal boride and sulfur composite nanomaterial

A technology of composite nanomaterials and metal borides, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as lithium polysulfide shuttle effect, and achieve clean and environmentally friendly preparation process, high commercial value, and catalytic discharge process Effect

Active Publication Date: 2020-06-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the shuttle effect of lithium polysulfide in lithium-sulfur batteries, to provide a preparation method and application of graphene composite metal boride and sulfur composite nanomaterials

Method used

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  • A kind of preparation method and application of graphene composite metal boride and sulfur composite nanomaterial
  • A kind of preparation method and application of graphene composite metal boride and sulfur composite nanomaterial
  • A kind of preparation method and application of graphene composite metal boride and sulfur composite nanomaterial

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specific Embodiment approach 1

[0023] Specific embodiment 1: This embodiment records a method for preparing graphene composite metal boride and sulfur composite nanomaterials, and the method steps are as follows:

[0024] Step 1: Dissolve sodium borohydride and NaOH in deionized water under inert gas protection to obtain a reducing agent solution, where the concentration of sodium borohydride and NaOH are both 0.5-3M, and dissolve the metal salt in deionized water. Obtain a metal salt aqueous solution with a concentration of 0.5-2M, and place the obtained reducing agent solution and metal salt aqueous solution separately in an ice water bath for 15 minutes;

[0025] Step 2: Under the protection of inert gas, slowly add the metal salt aqueous solution after the ice water bath to an equal volume of the reducing agent solution at a rate of one drop per second, and stir for 30-60 minutes to obtain a dried product, and then place the dried product in Calcined at a temperature of 350-500℃ for 2~10h to obtain metal bor...

specific Embodiment approach 2

[0028] Specific embodiment two: a method for preparing graphene composite metal boride and sulfur composite nanomaterials described in specific embodiment 1, in step 1, the metal salt is iron salt, cobalt salt, nickel salt, and molybdenum salt Kind of.

specific Embodiment approach 3

[0029] Specific embodiment three: a method for preparing graphene composite metal boride and sulfur composite nanomaterials described in specific embodiment 1, in step 2, the morphology of the metal boride is nanowires, nanorods, and nanospheres One of nanosheets, nanoparticles, nanoarrays, nanoflowers, and nanocubes is determined by its experimental temperature, adding speed and concentration; the surface defects of the material can be controlled by the calcination temperature.

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Abstract

The invention relates to a preparation method and application of a graphene composite metal boride and sulfur composite nano material and belongs to the technical field of energy materials. The preparation method comprises the following steps: dissolving a reducing agent and NaOH in deionized water under inert gas protection conditions, dissolving metal salt in deionized water and separately placing obtained two solutions in ice-water baths; slowly adding a metal salt aqueous solution into a reducing agent solution under inert gas protection conditions, stirring for 30 minutes and calcining for 2-10 hours at a high temperature to obtain metal boride; then performing a hydrothermal reaction on grapheme and the metal boride to obtain graphene compound metal boride; and mixing the graphene compound metal boride with elemental sulfur, and heating and calcining for 12-24 hours at a temperature of 150-180 DEG C to obtain the graphene composite metal boride and sulfur composite nano material.The preparation method and the application of the graphene composite metal boride and sulfur composite nano material, provided by the invention, have the advantages that the graphene compound metal boride has very high lithium polysulfide adsorption capacity, and the stability of a lithium-sulfur battery can be improved; and the cost of preparation raw materials is low, the preparation process issimple, and the preparation process is clean and environmentally-friendly.

Description

Technical field [0001] The invention belongs to the technical field of energy materials, and specifically relates to a preparation method and application of a graphene composite metal boride and sulfur composite nano material. Background technique [0002] With the development of the portable electronics industry, the demand for batteries with high specific energy has become more urgent. Limited by the specific capacity of traditional lithium cobalt oxide, lithium manganate and other materials, lithium ion batteries have been unable to meet the increasing demand. It is imperative to seek a secondary battery with a higher specific capacity. Lithium-sulfur batteries have received attention from researchers in recent years. With high specific capacity (1675mAh / g), low cost, wide source of elemental sulfur, and non-toxicity, lithium-sulfur batteries are expected to become the next generation of commercial secondary battery systems. [0003] However, there are still many difficulties r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/587H01M4/62
CPCH01M4/364H01M4/38H01M4/58H01M4/587H01M4/625Y02E60/10
Inventor 张乃庆关斌孙克宁范立双
Owner HARBIN INST OF TECH
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