A kind of preparation method and application of metal boride and sulfur composite nanomaterial
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A technology of composite nanomaterials and metal borides, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as lithium polysulfide shuttle effect, and achieve a clean and environmentally friendly preparation process. The effect of simplicity and excellent catalytic activity
Active Publication Date: 2020-05-19
HARBIN INST OF TECH
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[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 metal boride and sulfur composite nanomaterials
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specific Embodiment approach 1
[0022] Specific embodiment one: what this embodiment records is a kind of preparation method of metal boride and sulfur composite nanomaterial, described method step is as follows:
[0023] Step 1: dissolving sodium borohydride and NaOH in deionized water under inert gas protection conditions to obtain a reducing agent solution, wherein the concentrations of sodium borohydride and NaOH are both 0.5-3 M; dissolving the metal salt in deionized water, To obtain a metal salt solution with a concentration of 0.5-2M, separate the obtained reducing agent solution and metal salt solution into an ice-water bath for 15 minutes;
[0024] Step 2: Under the protection of an inert gas, slowly add the metal salt solution after the ice-water bath to an equal volume of reducing agent solution at a rate of one drop per second, and stir for 30 minutes to obtain a dry product, and then place the dry product at 350- High-temperature calcination at 500°C for 2-10 hours to obtain metal borides;
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specific Embodiment approach 2
[0026] Specific embodiment two: the preparation method of a metal boride and sulfur composite nanomaterial described in specific embodiment one, in step one, the metal salt is a kind of in iron salt, cobalt salt, nickel salt, molybdenum salt .
specific Embodiment approach 3
[0027] Specific embodiment three: the preparation method of a metal boride and sulfur composite nanomaterial described in specific embodiment one, in step two, the morphology of the metal boride is nanowire, nanorod, nanosphere, nanosheet , nanoparticle, nanoarray, nanoflower, nanocube, determined by its experimental temperature, adding speed and concentration; material surface defects can be regulated by calcination temperature.
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Abstract
The invention relates to a preparation method and application of a metal boride and sulfur composite nanometer material, and belongs to the technical field of an energy material. The method comprisesthe following steps: dissolving a reducing agent and NaOH into deionized water under the protection condition of inert gas, dissolving metal salt into the deionized water and putting the obtained twosolutions into ice-water bath separately; under the protection condition of the inert gas, slowly adding the metal salt aqueous solution in the step 1 into the reducing agent solution, stirring for 30minutes and performing high-temperature calcination for 2 to 10 hours to obtain metal boride; and mixing the metal boride and elemental sulfur according to the mass ratio of 1:(1-4), and heating andcalcining at the temperature of 150 to 180 DEG C for 12 to 24 hours to obtain the metal boride and sulfur composite nanometer material. The preparation method and the application of the metal boride and sulfur composite nanometer material have the following advantages: the metal boride has high lithium polysulfide adsorption ability and can improve the stability of a lithium sulfur battery; the crystallinity degree and the defect site of the metal boride can be controlled through different calcination temperature and time, so that the whole performance of the lithium sulfur battery is controlled; and the cost is low, the process is simple and the preparation process is clean and environment-friendly.
Description
technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method and application of metal boride and sulfur composite nanomaterials. Background technique [0002] With the development of the portable electronics industry, the demand for high specific energy batteries is more urgent, limited by the specific capacity of traditional materials such as lithium cobaltate and lithium manganese oxide, lithium ion batteries have been unable to meet the growing demand. It is imperative to seek a secondary battery with higher specific capacity. Lithium-sulfur battery has attracted the attention of researchers in recent years. It has the characteristics of high specific capacity (1675mAh / g), low cost, wide source of elemental sulfur, and non-toxicity. It is expected to become the next generation of commercialized secondary battery system. [0003] However, there are still many difficulties restricting the commerc...
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