A high-performance lithium-ion battery negative electrode si@n-c composite material and its preparation method

A technology of lithium-ion batteries and composite materials, which is applied in the field of high-performance lithium-ion battery anode Si@N-C composite materials and its preparation, can solve the problems of inability to utilize horsetail grass biomass, achieve good conductivity, realize utilization, and be cheap Effect

Active Publication Date: 2019-10-18
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the rational utilization of horsetail grass biomass will contribute to environmental protection and crop growth, but the rational use of horsetail grass biomass cannot be carried out at present

Method used

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  • A high-performance lithium-ion battery negative electrode si@n-c composite material and its preparation method
  • A high-performance lithium-ion battery negative electrode si@n-c composite material and its preparation method
  • A high-performance lithium-ion battery negative electrode si@n-c composite material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0063] A high-performance lithium-ion battery negative electrode Si@N-C composite material, the composite material is a composite of silicon and nitrogen-doped carbon, the mass content of silicon in the composite is 45.57%, and the mass content of carbon is 49.53%, The mass content of nitrogen is 4.90%.

[0064] The preparation method of the above-mentioned Si@N-C composite material includes the following steps:

[0065] (1) Collect horsetail grass, wash, dry and crush it to obtain 1g of powder with a mesh number of 200, place it in 6mol / L 50mL hydrochloric acid aqueous solution, soak it at 120°C for 5 hours, filter it with suction, and wash it with deionized water , dried at 50°C for 12 hours to obtain pretreated horsetail grass powder. Take 1.5 grams of the above powder and put it into a tube furnace for calcination at 800 °C for 6 hours in an air atmosphere to obtain white SiO 2 powder.

[0066] (2) Take 0.15 grams of SiO 2 The powder and 1.25 g of magnesium powder were...

Embodiment 2

[0075] A method for preparing a high-performance lithium-ion battery negative electrode material Si@N-C composite material, comprising the following steps:

[0076] (1) Collect horsetail grass, wash, dry and crush it to obtain 1.5g of powder with a mesh number of 1000, place it in 10mol / L 50mL hydrochloric acid aqueous solution, soak it at 130°C for 3 hours, and filter it with deionized water Wash and dry at 50°C for 12 hours to obtain pretreated horsetail grass powder. Take 1.5 g of the above powder and put it into a tube furnace for calcination at 700 °C for 8 hours in an air atmosphere to obtain white SiO 2 powder.

[0077] (2) Take 0.15 grams of SiO 2 The powder and 0.225 g of magnesium powder were ground and mixed evenly, and then placed in a tube furnace with an argon / hydrogen (volume ratio of 95:5) atmosphere and calcined at 750° C. for 6 hours to obtain crude silicon powder. At room temperature, soak the above crude Si powder in 50 mL of 8 mol / L hydrochloric acid aq...

Embodiment 3

[0081] A method for preparing a high-performance lithium-ion battery negative electrode material Si@N-C composite material, the preparation method of the Si material is as described in Example 1, the difference is that in step (3): the prepared 50mg Si material and 0.5 grams of ten Sodium dialkyl sulfonate was added to 50 mL of deionized water, ultrasonicated until uniformly mixed, 100 microliters of pyrrole monomer was added, stirred at 0°C for 30 min, and then 20 mL of 0.1 mol / L ammonium persulfate aqueous solution was slowly added dropwise (dropping speed rate of 5ml / min), react at 0°C for 6 hours, filter with suction, wash alternately with deionized water and absolute ethanol, and dry at 50°C for 12h to obtain Si@polypyrrole composite material; place it in a tube furnace with nitrogen atmosphere Calcined at 400°C for 2 hours to obtain Si@N-C composites.

[0082] The Si@N-C composite material prepared in this example was used as the negative electrode material of the lithiu...

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Abstract

The invention relates to a high-performance lithium ion battery negative electrode Si@N-C composite material and a preparation method therefor. According to the method, gulfweed is used as the raw material to prepare SiO<2> and then reduction is preformed to obtain a Si material; and next, pyrrole is used as the main raw material to coat polypyrrole on the surface of the Si material, and calcining is preformed to obtain the Si@N-C composite material. The raw materials adopted in the method are simple and easily available, low in cost and environment friendly, and toxic and harmful material generation in the preparation process is avoided; in addition, the problem existing in reasonable utilization of gulfweed is solved effectively, and economic efficiency and environment protection are realized; in addition, the silicon material extraction method disclosed in the invention has certain universality for extracting the silicon material form other silicate-containing plants; furthermore, heteroatom N-doped C coating is realized through high-molecular polymer polypyrrole pyrolysis is realized, so that the conductivity and the stability of the Si material are greatly improved, thereby improving the lithium ion battery performance of the Si@N-C composite material.

Description

technical field [0001] The invention relates to a high-performance lithium-ion battery negative electrode Si@N-C composite material and a preparation method thereof, belonging to the technical field of electrochemistry and new energy materials. Background technique [0002] In recent years, lithium-ion batteries have received more and more attention due to their advantages such as high energy density, long service life, and low self-discharge. The key to improving the overall performance of lithium-ion batteries is to improve the performance of positive and negative electrode materials. Among them, graphite has been widely used in lithium-ion battery negative electrode materials, but its low theoretical specific capacity (372mAh g -1 ) cannot meet people's urgent demand for high energy density. Judging from the current research status, Si has a very high theoretical specific capacity (4200mAhg -1 ), lower discharge voltage and abundant raw materials, it is considered to be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 徐立强何妍妍徐刚
Owner SHANDONG UNIV
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