Preparation method of silicon/graphene nanocomposite material for cathode of lithium ion battery

A nano-composite material, lithium-ion battery technology, applied in graphene, battery electrodes, nanotechnology for materials and surface science, etc. Effect

Active Publication Date: 2012-07-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the silicon source of these methods mostly adopts commercialized pure silicon, and the cost price is relatively high, which will be subject to certain restrictions in large-scale production.

Method used

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  • Preparation method of silicon/graphene nanocomposite material for cathode of lithium ion battery
  • Preparation method of silicon/graphene nanocomposite material for cathode of lithium ion battery
  • Preparation method of silicon/graphene nanocomposite material for cathode of lithium ion battery

Examples

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Effect test

Embodiment 1

[0032] A method for preparing a silicon / graphene nanocomposite material for a negative electrode of a lithium ion battery, specifically comprising the following steps:

[0033] (1) Under the condition of an ice-water bath, add 2 grams of graphite and 1 gram of sodium nitrate to 50 milliliters of concentrated sulfuric acid, stir for 30 minutes, then slowly add 6 grams of potassium permanganate powder, and keep the temperature of the entire system at 20 ° C and stir About 2 hours, then the temperature was raised to 40°C and kept for 1 hour. Add 90 milliliters of deionized water to the mixture, raise the temperature to 95° C., then dropwise add 20 milliliters of 5% hydrogen peroxide solution, stir evenly, centrifugally filter, and vacuum dry to obtain graphite oxide.

[0034] (2) Get 0.4 gram of graphite oxide prepared in the previous step and add in 78 milliliters of ethanol solution, ultrasonic for 3 hours, add 0.0025 gram of cetyltrimethylammonium bromide, stir for 0.5 hour, a...

Embodiment 2

[0039] A method for preparing a silicon / graphene nanocomposite material for a negative electrode of a lithium ion battery, specifically comprising the following steps:

[0040] (1) the preparation of graphite oxide is with embodiment (1)

[0041] (2) Get 0.3 gram of graphite oxide prepared in the previous step and add in 80 milliliters of ethanol solution, ultrasonic for 3 hours, add 0.003 gram of cetyltrimethylammonium chloride, stir for 1 hour, add 20 milliliters of deionized water and 5 ml of tetraethyl silicate, ultrasonic treatment for 3 hours, adding 5 ml of hydrazine hydrate, stirring at 90°C for 12 hours, washing, filtering, and vacuum drying to obtain a silica / graphene composite material.

[0042] (3) Mix 0.2 grams of silica / graphene composite material with 0.2 grams of magnesium powder, spread evenly on the bottom of the magnetic boat, put the magnetic boat into a quartz tube filled with argon, seal it, and place the quartz tube with the argon Calcined at 750°C for ...

Embodiment 3

[0046] A method for preparing a silicon / graphene nanocomposite material for a negative electrode of a lithium ion battery, specifically comprising the following steps:

[0047] (1) Preparation of graphite oxide: under the condition of an ice-water bath, add 1 gram of graphite and 1 sodium nitrate to 50 ml of concentrated sulfuric acid, stir evenly, slowly add 4 g of potassium permanganate powder, in the process, the temperature of the whole system is controlled Stir between 10°C and heat up to 30°C. 60 ml of deionized water was added dropwise to the above mixed solution, and the temperature was controlled at 90°C. Then 10 ml of 5% hydrogen peroxide solution was added dropwise, stirred evenly, centrifugally filtered, and vacuum-dried to obtain powdered graphite oxide.

[0048] (2) Preparation of silica / graphene oxide composite material: Take 0.2 g of graphite oxide powder and add it to 60 ml of ethanol solution, ultrasonicate for 2 hours, add 0.001 g of cetyltrimethylammonium ...

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Abstract

The invention relates to a preparation method of a silicon/graphene nanocomposite material for a cathode of a lithium ion battery, which comprises the steps of: preparing oxidized graphite; preparing a silica/ graphene nanocomposite material under the existence of a surfactant; then preparing the silicon/graphene nanocomposite material for the cathode of the lithium ion battery through the magnesiothermic reduction reaction. Compared with the prior art, the graphene in the composite material, prepared by the invention, can better inhibit volumetric expansion of silicon material in the insertion and separation process of lithium ions so as to improve the circulating performance of the composite material greatly, so that the volume of the material after 30 circulations under the current of 200mA/g is still maintained to be above 1100mAh/g.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a preparation method of a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles and energy storage devices in modern society due to their advantages such as large specific capacity, high working voltage, good safety and low pollution. However, with the improvement of equipment power, the capacity of traditional lithium-ion batteries can no longer meet the daily needs, and high-capacity batteries have become a research hotspot. The anode material is the main storage body of lithium ions in the charging and discharging process. Controlling the intercalation and extraction of lithium ions in the working process of the battery is the key to improving the parameters of lithium ion battery capacity, cycle performance and charge and discharge perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38C01B31/04C01B33/12B82Y30/00B82Y40/00C01B32/184
CPCY02E60/12Y02E60/10
Inventor 朱申敏余自勇张荻崔照文路涛
Owner SHANGHAI JIAO TONG UNIV
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