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Preparation method of lithium ion battery negative electrode material silicon oxide-carbon/graphite

A lithium ion battery, silicon oxide technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., to improve electrochemical performance, enhance electronic conductivity, and facilitate industrial mass production.

Active Publication Date: 2019-04-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention provides a preparation method of silicon oxide-carbon / graphite, which is a negative electrode material of a lithium ion battery, which improves the electronic conductivity of the material, improves the first Coulombic efficiency of the material, and at the same time solves the problem of uniformly compounding high electronic conductivity materials with silicon oxide particles The problem

Method used

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  • Preparation method of lithium ion battery negative electrode material silicon oxide-carbon/graphite

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Embodiment 1

[0030] Weigh 2.08g of tetraethyl orthosilicate and dissolve it in 4mL of ethanol, stir for a while, then add 2mL of deionized water and 1mL of hydrochloric acid into it to obtain a mixed solution A. After the mixture A was vigorously stirred for 1 hour, a silica sol was obtained, and the pH of the sol was adjusted to 6.5 with 1M ammonia water, and the stirring was continued for a period of time to obtain a silica gel.

[0031] Weigh 1.98g of graphite powder and disperse it in 70mL of deionized water. After ultrasonically stirring for a period of time, weigh 0.6g of sucrose, add it to the graphite powder dispersion, and stir until completely dissolved to obtain a mixed solution B.

[0032] Add the mixed solution B into the silicone gel, and after stirring for a period of time, a silicon-oxygen-sucrose-graphite black gel is obtained. The black gel was transferred to a ball mill jar, the ball milling speed was 300 rpm, and the ball milling time was 3 hours. The ball milled black ...

Embodiment 2

[0038] Weigh 4.16g of tetraethyl orthosilicate and dissolve it in 8mL of ethanol, stir for a while, then add 13mL of deionized water and 2mL of hydrochloric acid into it to obtain a mixed solution A. After the mixture A was vigorously stirred for 1 hour, a silica sol was obtained, and the pH of the sol was adjusted to 6.5 with 1M ammonia water, and the stirring was continued for a period of time to obtain a silica gel.

[0039] Weigh 2.08g of graphite powder and disperse it in 70mL of deionized water. After ultrasonically stirring for a period of time, weigh 2g of sucrose, add it to the graphite powder dispersion, and stir until completely dissolved to obtain a mixed solution B.

[0040] Add the mixed solution B into the silicone gel, and after stirring for a period of time, a silicon-oxygen-sucrose-graphite black gel is obtained. The black gel was transferred to a ball mill jar, the ball milling speed was 400 rpm, and the ball milling time was 1 hour. The ball milled black ge...

Embodiment 3

[0045] Weigh 4.16g of tetraethyl orthosilicate and dissolve it in 5mL of ethanol, stir for a while, then weigh 5mL of deionized water and 2mL of hydrochloric acid and add it to obtain a mixed solution A. After the mixture A was vigorously stirred for 1 hour, a silica sol was obtained, and the pH of the sol was adjusted to 6.5 with 1M ammonia water, and the stirring was continued for a period of time to obtain a silica gel.

[0046] Weigh 6g of graphite powder and disperse it in 80mL of deionized water. After ultrasonically stirring for a period of time, weigh 1.2g of sucrose, add it to the graphite powder dispersion, and stir until completely dissolved to obtain a mixed solution B.

[0047] Add the mixed solution B into the silicone gel, and after stirring for a period of time, a silicon-oxygen-sucrose-graphite black gel is obtained. The black gel was transferred to a ball mill jar, the ball milling speed was 200 rpm, and the ball milling time was 5 hours. The ball milled blac...

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Abstract

The invention relates to a preparation method of a lithium ion battery negative electrode material silicon oxide-carbon / graphite. The preparation method comprises the steps of taking tetraethyl orthosilicate as a silicon source and sucrose as a carbon source, performing in-situ combination on a gel-state silicon oxide, the sucrose and the graphite by hydrolysis-condensation reaction of the tetraethyl orthosilicate, and performing ball-milling to disperse the graphite to obtain a uniform silicon-oxygen-sucrose-graphite precursor; and allowing the sucrose to split and reducing silicon oxide during the subsequent thermal treatment process so as to prepare the uniformly-combined silicon oxide-carbon / graphite material. The in-site process of the silicon oxide and the graphite is simple in process and low in cost, and the prepared silicon oxide-carbon / graphite material is uniform in combination; with the introduction of the graphite, the electron conductivity of the composite material can beimproved, the coulombic efficiency of the composite electrode material is effectively improved, so that the electrochemical performance of the electrode material is remarkably improved; and the silicon oxide-carbon / graphite material can be used as a potential high-performance lithium ion battery negative electrode material and is expected to be widely applied to the fields of various types portable electronic equipment, an electric automobile and aerospace.

Description

technical field [0001] The invention belongs to the fields of new energy materials and electrochemistry, and in particular relates to a preparation method of silicon oxide-carbon / graphite, a negative electrode material of a lithium ion battery. technical background [0002] As one of the most mature secondary batteries in the world, lithium-ion batteries have the advantages of high energy density, environmental friendliness, and long cycle life, and have been widely used commercially in the field of portable electronic devices. With the continuous development of the field of large-scale energy storage, lithium-ion batteries are gradually developing into fields such as electric vehicles, aerospace, and large-scale energy storage systems. In order to meet the needs of practical applications, the requirements for technical indicators such as energy density, cycle performance and safety of lithium-ion batteries are constantly improving. Anode materials are one of the key factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 赵海雷陶昕李兆麟张子佳付博扬
Owner UNIV OF SCI & TECH BEIJING
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