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Silicon monoxide-based anode material for lithium ion battery and method for preparing same

A silicon oxide-based, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of unfavorable industrialization, rapid capacity decline, long and complicated preparation, etc., and achieve good carbon coating effect , good application prospects, simple operation effect

Active Publication Date: 2019-05-03
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction time is too long, the stirring time for hydrolysis of ethyl orthosilicate needs 24 hours, and the hydrothermal time in the reactor needs 48 hours, and the preparation is too long and complicated, which is not conducive to industrialization
[0006] CN 103700816A patent mixes silicon oxide, silicon and graphite ball mills and then mixes them with asphalt, and then heats them at high temperature to obtain silicon-silicon oxide-carbon composite negative electrode materials for lithium-ion batteries. Graphite and pyrolytic carbon alleviate the volume Swells and provides a conductive network, but capacity drops faster during cycling due to poor coating

Method used

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  • Silicon monoxide-based anode material for lithium ion battery and method for preparing same
  • Silicon monoxide-based anode material for lithium ion battery and method for preparing same
  • Silicon monoxide-based anode material for lithium ion battery and method for preparing same

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Embodiment 1

[0027] The preparation method of the lithium-ion battery silicon oxide-based negative electrode material of this embodiment, the steps are as follows:

[0028] (1) Weigh 8 g of ethyl orthosilicate and add it to 15 ml of absolute ethanol, stir well to form an ethanol solution of ethyl orthosilicate, measure 5 ml of deionized water and add it to the ethanol solution of ethyl orthosilicate After stirring for 1 h, concentrated hydrochloric acid was added to adjust the pH to 5, and the sol was obtained after stirring for 10 min;

[0029] (2) Add 2 ml of hydrogen peroxide as a loosening agent to the sol, continue stirring for 30 min, weigh 2.5 g of sucrose and dissolve it in the above sol, stir vigorously until the sucrose is fully dissolved, and continue stirring for 30 min to make it evenly dispersed. Then magnetically heat and stir at 90°C until the solvent is completely volatilized, and grind evenly with a mortar to obtain silica / carbon precursor powder;

[0030] (3) Finally, p...

Embodiment 2

[0033] The preparation method of the lithium-ion battery silicon oxide-based negative electrode material of this embodiment, the steps are as follows:

[0034] (1) Weigh 8 g of tetramethyl orthosilicate and add it into 15 ml of isopropanol, stir evenly to form an isopropanol solution of tetramethyl orthosilicate. Measure 10 ml of deionized water and add it to the ethanol solution of tetramethyl orthosilicate, stir for 1 h, add concentrated hydrochloric acid, adjust the pH=4, and stir for 10 min to obtain a sol;

[0035](2) Add 4 ml of hydrogen peroxide to the sol as a loosening agent, continue to stir for 30 min, weigh 5 g of sucrose and dissolve it in the above sol, stir vigorously until the sucrose is fully dissolved, continue to stir for 40 min to make it evenly dispersed, and then Stir with magnetic heating at 95°C until the solvent is completely volatilized, and grind evenly with a mortar to obtain silica / carbon precursor powder;

[0036] (3) Heat the powder at 900°C in ...

Embodiment 3

[0039] The preparation method of the lithium-ion battery silicon oxide-based negative electrode material of this embodiment, the steps are as follows:

[0040] (1) Weigh 8 g of tetraethyl orthosilicate and add it into 20 ml of glycerol, stir well to form a glycerol solution of tetraethyl orthosilicate. Measure 16 ml of deionized water and add it to the glycerin solution of ethyl orthosilicate, stir for 1 h, then add nitric acid to adjust the pH to 4, and stir for 10 min to obtain a sol.

[0041] (2) Add 10ml of hydrogen peroxide to the sol as a loosening agent, and continue stirring for 30 min. Weigh 8 g of sucrose and dissolve in the above sol, stir vigorously until the sucrose is fully dissolved, then continue to stir for 40 min to make it evenly dispersed. Then magnetically heat and stir at 95°C until the solvent is completely volatilized, and grind evenly with a mortar to obtain a silicon dioxide / carbon precursor powder.

[0042] (3) Heat the powder at 800°C under Ne atm...

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Abstract

The invention discloses a method for preparing a silicon monoxide-based anode material for a lithium ion battery, and belongs to the fields of new materials and electrochemistry. The method comprisesusing organic silicon as a silicon source and organic carbon as a carbon source; obtaining a silica / carbon precursor by a sol-gel method; and preparinga SiOx / C composite material having double interfaces by a carbon thermal reduction reaction occurring during a high-temperature heat treatment process. The method controls the colloidalization process of the organic silicon source to uniformly disperse the silicon source and the carbon source, enhances the ability of the carbon thermal reduction reaction in the heat treatment process, and obtains the silicon monoxide-based anode material with agood pyrolytic carbon coating effect. In addition, by adding a loosening agent, the method solves problem that the material is easily densified during the heat treatment. The anode material has high specific capacity and good cycle stability. The method is easy to operate and low in cost. The preparation process does not relate to acid washing and centrifugation. The method has a good applicationprospect.

Description

technical field [0001] The invention belongs to the field of new materials and electrochemistry, and in particular relates to a silicon oxide-based negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] As a new generation of green secondary batteries, lithium-ion batteries have the advantages of high energy density, high rated working voltage, small self-discharge rate, good cycle performance, and high charge-discharge efficiency. They are widely used in portable electronic devices, electric vehicles and energy storage fields. . However, limited by the specific capacity of conventional positive and negative active materials, it is difficult for commercial lithium-ion batteries to meet the demand for higher energy density. Therefore, the development of high-energy-density electrode materials is an important application research direction for lithium-ion batteries. [0003] Graphite is currently the most commonly...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 刘艳侠张锁江阮晶晶刘凡范亚蒙王璞刘婷
Owner 郑州中科新兴产业技术研究院
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