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Biomass silicon-based composite material and preparation method thereof

A silicon-based composite material and biomass technology, applied in the field of silicon materials, can solve the problems of high preparation cost and complex preparation process, and achieve the effects of small particle size, uniform particle size distribution, improved electrical conductivity and cycle stability

Inactive Publication Date: 2019-04-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lithium-ion battery anode materials prepared by these methods show good performance, their preparation costs are high and the preparation process is complicated.

Method used

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  • Biomass silicon-based composite material and preparation method thereof
  • Biomass silicon-based composite material and preparation method thereof
  • Biomass silicon-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The invention discloses a biomass silicon-based composite material and a preparation method thereof, comprising the following steps:

[0041] The calcined product obtained after calcining horsetail grass stems is mixed with magnesium powder at a mass ratio of 1:0.8, and then placed in a tube furnace for heat treatment at 600°C under argon gas;

[0042] After the magnesia reduction product is taken out, it is pickled with 1mol / L hydrochloric acid to remove impurities such as magnesium oxide therein, then centrifuged and filtered, and the filtered solid is dried for later use to obtain a silicon-based product;

[0043] The silicon-based product is mixed with the asphalt solution and then dried, and then the dried product is heat-treated in an argon gas environment at a temperature of 800° C. to obtain a biomass-based silicon-based composite material.

[0044] The biomass silicon-based composite material obtained above is used as a silicon negative electrode composite mate...

Embodiment 2

[0047] The invention discloses a biomass silicon-based composite material and a preparation method thereof, comprising the following steps:

[0048] The calcined product is obtained by calcining the stems of Vitex chinensis, and the calcined product is mixed with magnesium powder at a mass ratio of 1:1, and then placed in a tube furnace in an argon gas and a temperature environment of 650°C for heat treatment;

[0049] After the magnesia reduction product is taken out, it is pickled with 1mol / L hydrochloric acid to remove impurities such as magnesium oxide therein, then centrifuged and filtered, and the filtered solid is dried for later use to obtain a silicon-based product;

[0050] The silicon-based product is mixed with the asphalt solution and then dried, and then the dried product is heat-treated in an argon gas environment at a temperature of 850° C. to obtain a biomass-based silicon-based composite material.

[0051] The biomass silicon-based composite material obtained...

Embodiment 3

[0054] The invention discloses a biomass silicon-based composite material and a preparation method thereof, comprising the following steps:

[0055]The calcined product is obtained by calcining the stems of Vitex Linnensis, and the calcined product is mixed with magnesium powder at a mass ratio of 1:1.1, and then placed in a tube furnace under argon gas and a temperature environment of 660°C for heat treatment;

[0056] After the magnesia reduction product is taken out, it is pickled with 1mol / L hydrochloric acid to remove impurities such as magnesium oxide therein, then centrifuged and filtered, and the filtered solid is dried for later use to obtain a silicon-based product;

[0057] Mix the silicon-based product with the asphalt solution and dry it, and then heat-treat the dried product in an argon gas environment at a temperature of 900°C;

[0058] The biomass silicon-based composite material obtained above is used as a silicon negative electrode composite material for lith...

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Abstract

The invention discloses a biomass silicon-based composite material and a preparation method thereof. The preparation method comprises the following steps of: calcining a plant stem in the air at a temperature of 300-1000 DEG C, mixing a calcined product with magnesium powder, and putting the mixture in a tube furnace to perform heat treatment in an environment with a protective gas and at a temperature in a range of 500-1000 DEG C to obtain a magnesiothermic reduction product; performing acid pickling of the magnesiothermic reduction product to remove impurities wherein such as magnesium oxide, and performing centrifugation, filtering and drying to obtain a silicon-based product; and uniformly mixing the prepared silicon-based product with an organic precursor to perform drying, putting the mixture in the protective gas, and performing heat treatment of the mixture in a temperature condition in a range of 800-1200 DEG C to obtain a biomass silicon-based composite material. The calcination of the Equisetaceae plant and magnesiothermic reduction treatment are performed to obtain a silicon material, and the silicon material has a hierarchical porous structure, is small in particle size, uniform in particle diameter distribution and large in specific surface area so as to greatly improve the conductivity and the cycling stability of the silicon material.

Description

technical field [0001] The invention relates to the technical field of silicon materials, in particular to a biomass silicon-based composite material and a preparation method thereof. Background technique [0002] Due to the advantages of large specific capacity, high working voltage, good safety, and low environmental pollution, lithium-ion batteries have broad application prospects in various portable electronic devices and electric vehicles. As an anode material with great application potential, silicon has a known high theoretical lithium intercalation specific capacity and low intercalation / delithiation potential, and is considered to be one of the most promising anode materials for lithium-ion batteries. However, silicon has the disadvantages of poor electronic conductivity and obvious volume effect in the intercalation / delithiation process. [0003] To solve this problem, many methods have been proposed, such as changing the shape of silicon, preparing silicon nanowi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 郭玉忠胡省辉黄瑞安王剑华
Owner KUNMING UNIV OF SCI & TECH