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Method for preparing carbon-silicon composite material by utilizing algae biomass and application of carbon-silicon composite material in lithium ion battery

A lithium-ion battery and composite material technology, which is applied in the field of preparing carbon-silicon composite materials, achieves the effects of wide application prospects, improved production efficiency and safety, and low cost

Pending Publication Date: 2022-02-08
LANZHOU CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of resource utilization of harmful algae pollutants in red tides and water blooms, to simultaneously utilize carbon and silicon elements in algae biomass, and to provide a molten salt method and use algae biomass to prepare Methods for carbon-silicon composites;

Method used

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  • Method for preparing carbon-silicon composite material by utilizing algae biomass and application of carbon-silicon composite material in lithium ion battery
  • Method for preparing carbon-silicon composite material by utilizing algae biomass and application of carbon-silicon composite material in lithium ion battery
  • Method for preparing carbon-silicon composite material by utilizing algae biomass and application of carbon-silicon composite material in lithium ion battery

Examples

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Effect test

Embodiment 1

[0038] A method for preparing a carbon-silicon (Si@C) composite material, the specific steps of the method are:

[0039] (1) Fully mix and stir 20 g of algae biomass with 500 mL of water and 40 mL of 0.5 mol / L dilute hydrochloric acid, filter, wash with water, and dry to obtain algae biomass without inorganic salts;

[0040] (2) Crush the above-mentioned algae biomass from which inorganic salts have been removed, and calcinate in a muffle furnace at 450°C for 2 hours in an air atmosphere to obtain a composite of black silica and carbon, and part of the composite of silica and carbon The content of silicon dioxide in the compound of silicon dioxide and carbon is 30.8% by calcining in air to remove carbon;

[0041] (3) Grind the composite of silica and carbon obtained in step (2) into powder, according to silica: magnesium metal powder: AlCl 3 Molten salt according to the molar ratio of 1:2.2:50, adding magnesium metal powder and anhydrous AlCl 3 Molten salt, and grind evenly ...

Embodiment 2

[0045] A method for preparing a carbon-silicon (Si@C) composite material, the specific steps of the method are:

[0046] (1) Fully mix and stir 20 g of algae biomass with 500 mL of water and 40 mL of 0.5 mol / L dilute hydrochloric acid, filter, wash with water, and dry to obtain algae biomass without inorganic salts;

[0047] (2) Crush the above-mentioned algal biomass from which inorganic salts have been removed, and calcinate it in an air atmosphere at 500°C for 2 hours in a muffle furnace to obtain a composite of black silica and carbon, and part of the silica and carbon The compound is calcined in air to remove carbon to obtain a content of 33.4% of silicon dioxide in the compound of silicon dioxide and carbon;

[0048] (3) Grind the product obtained in step (2) into powder, according to silica: magnesium metal powder: ZnCl 2 Molten salt according to the molar ratio of 1:2.2:50, adding magnesium metal powder and anhydrous ZnCl 2 Molten salt, and grind evenly in an inert a...

Embodiment 3

[0052] A method for preparing a carbon-silicon (Si@C) composite material, the specific steps of the method are:

[0053] (1) Fully mix and stir 20 g of algae biomass with 500 mL of water and 40 mL of 0.5 mol / L dilute hydrochloric acid, filter, wash with water, and dry to obtain algae biomass from which inorganic salts have been removed;

[0054] (2) Crush the above-mentioned algal biomass from which inorganic salts have been removed, and calcinate it in an air atmosphere at 500°C for 3 hours in a muffle furnace to obtain a composite of black silica and carbon, and part of the composite of silica and carbon The content of silicon dioxide in the compound of silicon dioxide and carbon is 30.7% by calcining in air to remove carbon;

[0055] (3) Grind the product obtained in step (2) into powder, according to silica: aluminum metal powder: AlCl 3 Molten salt according to the molar ratio of 1:1.8:50, adding aluminum metal powder and anhydrous AlCl 3 Molten salt, and grind evenly i...

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Abstract

The invention discloses a method for preparing a carbon-silicon composite material by utilizing algae biomass and application of the carbon-silicon composite material in a lithium ion battery. A molten salt method is adopted, algal biomass causing environmental pollution is fully utilized to prepare the carbon-silicon composite material, the process is simple, the cost is low, amorphous carbon formed by carbonization of carbon elements contained in an algal biomass precursor is uniformly and hierarchically compounded with silicon, and the conductivity of the material is effectively improved, in addition, sufficient coating of carbon can effectively relieve volume expansion in the charge-discharge process and inhibit pulverization of the electrode material, and can sufficiently maintain the structural integrity of the electrode, so that the cycle stability is improved, the cycle life of the battery is sufficiently and effectively improved, the requirements of modern industrial production can be sufficiently met, commercial large-scale production is realized, and the application prospect is very wide.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of biological waste resources and the technical field of lithium ion batteries, and specifically relates to a method for preparing a carbon-silicon composite material by using algae biomass; application. Background technique [0002] Harmful algal blooms (including red tides and algal blooms) are often reported around the world, which subsequently cause serious damage to the world's ecosystems and have extremely negative impacts on human society. Blue-green algae (cyanobacteria) in particular produce toxins (neurotoxins, cytotoxins, endotoxins and hepatotoxins) that pose a serious threat to human, livestock and wildlife life. Microcystins, substances released by cyanobacteria, are considered carcinogens and can bioaccumulate in aquatic organisms such as shellfish in eutrophic waters. A notable example is the seasonal massive reproduction of toxic algae in Chaohu Lake, Poyang La...

Claims

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Application Information

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IPC IPC(8): C01B33/023C01B32/05H01M4/36H01M4/38H01M4/62B82Y40/00
CPCC01B33/023C01B32/05H01M4/364H01M4/625H01M4/386B82Y40/00Y02E60/10
Inventor 刘现玉王熠哲刘铮姚方正赵苑
Owner LANZHOU CITY UNIV
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