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Silicon/graphene oxide anode material for lithium battery and preparation method thereof

A graphene negative electrode, graphene technology, applied in the direction of battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of no composite material preparation technology, no composite material lithium battery negative electrode materials, etc., to avoid capacity decay Too fast, good cycle performance, the effect of alleviating volume change

Inactive Publication Date: 2015-09-16
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no technology for compounding graphene oxide and Si to prepare composite materials, and there is no relevant report on related composite materials as lithium battery anode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take by weighing 5g of flaky graphite with a purity of 99.5%, add it into a mixed solution containing 350mL mass fraction of 98% concentrated sulfuric acid and 50mL mass fraction of 85% phosphoric acid, add 30g potassium permanganate in batches for oxidation, the The mixed solution was kept at 0° C., stirred for 2 h, then stirred in a water bath at room temperature for 12 h, and further stirred at 80° C. for 0.5 h to obtain a mixture. 350 mL of deionized water was slowly added to the mixture under ice bath conditions. After 15 minutes, add 15g of hydrogen peroxide to remove potassium permanganate, then the color of the mixture turns bright yellow, filter with suction, wash with dilute hydrochloric acid with a concentration of 10% for 3 times, filter with suction, and dry in vacuum at 60°C for 48 hours to obtain graphite oxide ene (GO).

[0036] Weigh 0.3g GO, add 20mL deionized water and 40mL ethylene glycol to ultrasonically disperse for 3 hours to form a dispersion l...

Embodiment 2

[0040] Take by weighing 3g of flaky graphite with a purity of 99.5%, add it to a mixed solution containing 350mL mass fraction of 98% concentrated sulfuric acid and 50mL mass fraction of 85% phosphoric acid, and add 18g potassium permanganate in batches for oxidation. The mixed solution was kept at 0° C., stirred for 2 h, then stirred in a water bath at room temperature for 12 h, and further stirred at 80° C. for 0.5 h to obtain a mixture. 350 mL of deionized water was slowly added to the mixture under ice bath conditions. After 15 minutes, add 9g of hydrogen peroxide to remove potassium permanganate, then the color of the mixture turns bright yellow, filter with suction, wash with dilute hydrochloric acid with a concentration of 10% for 3 times, filter with suction, and dry in vacuum at 60°C for 48 hours to obtain graphite oxide ene (GO).

[0041] Weigh 0.3g GO, add 40mL deionized water and 80mL ethylene glycol to ultrasonically disperse for 3 hours to form a dispersion liqu...

Embodiment 3

[0044] Take by weighing 5g of flaky graphite with a purity of 99.5%, add it into a mixed solution containing 300mL mass fraction of 98% concentrated sulfuric acid and 50mL mass fraction of 85% phosphoric acid, add 30g potassium permanganate in batches for oxidation, and The mixed solution was kept at 0° C., stirred for 2 h, then stirred in a water bath at room temperature for 12 h, and further stirred at 80° C. for 0.5 h to obtain a mixture. 350 mL of deionized water was slowly added to the mixture under ice bath conditions. After 15 minutes, add 15g of hydrogen peroxide to remove potassium permanganate, then the color of the mixture turns bright yellow, filter with suction, wash with dilute hydrochloric acid with a concentration of 10% for 3 times, filter with suction, and dry in vacuum at 60°C for 48 hours to obtain graphite oxide ene (GO).

[0045] Weigh 0.1g GO, add 30mL deionized water and 60mL ethylene glycol to ultrasonically disperse for 3 hours to form a suspension, ...

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Abstract

The present invention discloses a silicon / graphene oxide anode composite material for a lithium battery and a preparation method thereof. The anode composite material is formed by uniformly adsorbing nano silicon to the surface of graphene oxide. According to the preparation method, graphene oxide powder is ultrasonically dispersed in mixed solution of water and ethylene glycol to obtain dispersion liquid; the nano silicon and a dispersing agent are added into the dispersion liquid; ball milling is carried out until the nano silicon is completely dispersed; and drying is carried out to obtain the anode composite material with the sheet-like morphology, of which the nano silicon is uniformly adsorbed to the surface of the graphene oxide. The composite material can be used for preparing the lithium ion battery with the characteristics of high specific discharge capacity, excellent rate capability, long cycle life and the like; and the preparation method is simple and reliable, is good in process repeatability, has high operability, is low in cost and is suitable for industrial production.

Description

technical field [0001] The invention relates to a silicon / graphene oxide negative electrode material for lithium ion batteries and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Today lithium-ion batteries have been widely used in various fields of civil and military use. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic equipment requires batteries to have smaller volumes and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge and discharge performance, and higher safety performance; electric vehicles require batteries with large capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/058H01M10/0525
CPCH01M4/139H01M4/362H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 田东
Owner 田东
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