Silicon oxide, preparation method and application thereof

A silicon oxide, oxidizing environment technology, used in electrochemical generators, structural parts, electrical components, etc.

Active Publication Date: 2021-04-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prior art still lacks a safe, reliable, highly controllable method for pre

Method used

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  • Silicon oxide, preparation method and application thereof
  • Silicon oxide, preparation method and application thereof
  • Silicon oxide, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the oxidation environment is oxygen gas, and the controllable oxidation is gas heat treatment.

[0035] (1) Surface treatment: put 5g of silicon powder in a beaker and place it in a fume hood, add 50mL of ultrapure water to it, then slowly add 30mL of HF solution with a mass fraction of 15% into the beaker, place the beaker on Stir and react on a stirring table for 12 hours; after the reaction, wash with ultrapure water and ethanol with a mass fraction of 97.5%, centrifuge three times, and then place it in a vacuum oven at 80°C to dry to obtain the silicon dioxide after the surface passivation layer is removed. Granular powder (pristine Si).

[0036] (2) Controlled oxidation: place the silicon material with fresh silicon surface in an oxygen atmosphere tube furnace for heat treatment. The heat treatment is 1000 ° C for 2 hours, and the temperature is cooled to room temperature to obtain silicon oxide (SiO x )Material.

Embodiment 2

[0038] In this embodiment, the oxidation environment is water, and the controllable oxidation is hydrothermal treatment.

[0039] (1) Surface treatment: Put 5g of silicon powder in a beaker and place it in a fume hood, add 50mL of ultrapure water to it, then slowly add 30mL of HF solution with a mass fraction of 15% into the beaker, place the beaker on Stir and react on a stirring table for 12 hours; after the reaction, wash with ultrapure water and ethanol with a mass fraction of 97.5%, centrifuge three times, and then place it in a blast drying oven at 80°C to dry to obtain the surface passivation layer after removal. silicon powder.

[0040] (2) Controlled oxidation: Disperse 1 g of silicon material with a fresh silicon surface into 20 mL of ultrapure aqueous solution, disperse evenly by ultrasonic, and stir for 15 min. Then, the solution was transferred to a hydrothermal reaction kettle with a capacity of 100 mL, sealed and reacted in an oven at 200° C. for 24 h.

[0041] ...

Embodiment 3

[0043] The difference between this example and Example 2 is that glucose is added as a carbon source for carbon coating during the controlled oxidation process, as described in detail.

[0044] (1) Surface treatment: Put 5g of silicon powder in a beaker and place it in a fume hood, add 50mL of ultrapure water to it, then slowly add 30mL of HF solution with a mass fraction of 15% into the beaker, place the beaker on Stir and react on a stirring table for 12 hours; after the reaction, wash with ultrapure water and ethanol with a mass fraction of 97.5%, centrifuge three times, and then place it in a blast drying oven at 80°C to dry to obtain the surface passivation layer after removal. silicon powder.

[0045] (2) Controllable oxidation: disperse 1g of silicon material with fresh silicon surface into 20mL ultrapure aqueous solution, obtain silicon suspension after ultrasonic dispersion, dissolve glucose particles in 20mL ultrapure aqueous solution to obtain glucose solution, pour...

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Abstract

The invention belongs to the field of lithium ion battery negative electrode materials, and particularly relates to a silicon oxide, and a preparation method and an application thereof. The preparation method comprises the following steps: removing an original passivation layer on a silicon surface through surface treatment to expose a fresh silicon surface, and carrying out controllable oxidation on the fresh surface in an oxidation environment to obtain the silicon oxide. According to the oxidation of the silicon-based material in the silicon oxide material, firstly, the original passivation layer on the silicon surface is removed through a ball-milling crushing or acid pickling or alkali etching method so that the fresh surface is exposed, and the controllable oxidation is carried out in a mild oxidation environment by utilizing the high reaction activity of the fresh surface. By regulating and controlling the oxidation degree of the silicon-based material, the material has a relatively high capacity and relatively good cycling stability, and the problems of high preparation cost, high energy consumption and high uncontrollability of the traditional silicon oxide are solved.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and more specifically relates to a silicon oxide and its preparation method and application. Background technique [0002] As an important energy storage technology, lithium-ion batteries have been widely used in energy storage fields such as portable electronic devices and electric vehicles. With the continuous development of technology, people have higher and higher requirements for the energy density of energy storage materials, and the traditional graphite-based anode materials can no longer meet the capacity requirements of high energy density lithium-ion batteries. Silicon material has a high theoretical specific capacity (4200mAh g -1 ), low working potential, abundant natural content, and low cost. It can replace the graphite-based anode materials of commercial lithium-ion batteries and can improve the energy density of lithium-ion batteries, thus att...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 孙永明葛高锋
Owner HUAZHONG UNIV OF SCI & TECH
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