Carbon-silicon double-shell hollow structure composite microsphere and preparation method thereof and application

A technology of composite microspheres and double shells, applied in structural parts, active material electrodes, electrical components, etc., can solve problems such as unsuitable for industrial promotion, low utilization rate, and environmental pollution, so as to improve commercial value, reduce pollution, The effect of simple process method

Active Publication Date: 2019-10-22
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of solid waste fly ash in coal-fired power plants, which are difficult to use, low in utilization rate, and pollute the environment; silicon negative electrodes, materials and processes are not s

Method used

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  • Carbon-silicon double-shell hollow structure composite microsphere and preparation method thereof and application
  • Carbon-silicon double-shell hollow structure composite microsphere and preparation method thereof and application
  • Carbon-silicon double-shell hollow structure composite microsphere and preparation method thereof and application

Examples

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Example Embodiment

[0033] Example 1

[0034] A carbon-silicon double-shell hollow structure composite microsphere is prepared through the following steps:

[0035] (1) After acid leaching fly ash and sulfuric acid at 120°C, filter and separate, the solid obtained is fly ash acid leaching residue; take fly ash acid leaching residue and sodium hydroxide solution and mix and stir to obtain silicic acid Sodium solution, centrifuge to remove the precipitate, get the clear solution, take 5mL clear solution and weigh M1, then dry in the oven to obtain solid M2, calculate the clear solution solid content m = M2 / M1, take the surfactant at the ratio of 0.5% m Cetyltrimethylammonium bromide was added to the clear liquid, stirring was continued to dissolve to obtain a clear solution, and then spray-dried at an inlet temperature of 140°C and an outlet temperature of 80°C to obtain a white powder A;

[0036] (2) Dissolve the white powder A in distilled water, add hydrochloric acid dropwise, adjust the pH<4, filter ...

Example Embodiment

[0039] Example 2

[0040] A carbon-silicon double-shell hollow structure composite microsphere is prepared through the following steps:

[0041] (2) After acid leaching fly ash and hydrochloric acid at 140℃, filter and separate, the solid obtained is fly ash acid leaching residue; take fly ash acid leaching residue and potassium hydroxide solution and mix and stir to obtain silicic acid The potassium solution is centrifuged to remove the precipitate to obtain the clear solution. Take 5 mL of the clear solution and weigh M1, then dry it in an oven to obtain the solid M2. Calculate the clear solution solid content m = M2 / M1, and take the surfactant at the ratio of 10% m Sodium dodecylbenzene sulfonate polyvinylpyrrolidone was added to the clear solution, and stirring was continued to dissolve to obtain a clear solution, and then spray-dried at an inlet temperature of 200°C and an outlet temperature of 120°C to obtain a white powder A;

[0042] (2) Dissolve the white powder A in distil...

Example Embodiment

[0045] Example 3

[0046] A carbon-silicon double-shell hollow structure composite microsphere is prepared through the following steps:

[0047] (3) After acid leaching fly ash with sulfuric acid or hydrochloric acid at 130°C, filter and separate, the solid obtained is fly ash acid leaching residue; take fly ash acid leaching residue and sodium hydroxide solution and mix and stir to obtain Centrifuge the sodium silicate solution to remove the precipitate to obtain the clear liquid. Take 5 mL of the clear liquid to weigh M1, and then dry it in an oven to obtain solid M2. Calculate the solid content of the clear liquid m = M2 / M1, and take the surface at the ratio of 8% m The active agent polyethylene glycol was added to the clear liquid, continued to stir and dissolve to obtain a clear solution, and then spray dried at an inlet temperature of 160°C and an outlet temperature of 100°C to obtain a white powder A;

[0048] (2) Dissolve the white powder A in distilled water, add hydrochlor...

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Abstract

The invention belongs to the field of recycling and utilization of fly ash solid waste, and particularly relates to a carbon-silicon double-shell hollow structure composite microsphere and a preparation method thereof and application, mainly to solve the problems that the coal-fired power plant solid waste fly ash difficult to use, the utilization rate is low, the environment and a silicon negative electrode are polluted, materials and processes are not suitable for industrial promotion, the cost is high and the like. The carbon-silicon double-shell hollow structure composite microsphere is prepared by the following steps: (1) fly ash acid-leaching slag and an alkali solution are mixed to obtain a silicate solution, clear liquid is obtained by centrifuging, a surfactant is added to the clear liquid for continuous stirring and dissolving, a clear solution is obtained, and through spraying and drying, white powder A is obtained; (2) the white powder is washed to obtain white powder B; (3) the white powder B is taken for a thermite or magnesiothermic reduction reaction to obtain hollow silicon microspheres; and (4) the hollow silicon microspheres are subjected to carbon coating treatment, and thus, the carbon-silicon double-shell hollow structure composite microsphere is obtained.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of fly ash solid waste, and in particular relates to a carbon-silicon double-shell hollow structure composite microsphere and a preparation method and application thereof. Background technique [0002] New energy vehicles are one of the strategic industries that carry the national new energy policy, and are also an important platform for promoting technological and social development. Pure electric vehicles powered by lithium-ion batteries are currently the mainstream form of new energy vehicles. In 2017, the total demand for lithium-ion battery cells has reached more than 160GWh, and the market size has reached more than 230 billion. However, the graphite negative electrode and lithium iron phosphate or ternary positive electrode materials currently used in lithium-ion batteries are close to the theoretical capacity, which makes it difficult for the energy density of traditional lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 马灿良赵云
Owner SHANXI UNIV
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