Silicon graphene composite anode material of lithium ion battery and preparation method of silicon graphene composite anode material

A graphene composite and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low production efficiency, high raw material cost, cumbersome preparation process, etc., achieve high yield and simple and easy preparation method , the effect of excellent cycle performance

Active Publication Date: 2012-01-04
浙江钠创新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of the composite material is cumbersome...

Method used

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  • Silicon graphene composite anode material of lithium ion battery and preparation method of silicon graphene composite anode material
  • Silicon graphene composite anode material of lithium ion battery and preparation method of silicon graphene composite anode material
  • Silicon graphene composite anode material of lithium ion battery and preparation method of silicon graphene composite anode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Disperse 0.1g of silicon powder (average particle size 100nm) and 0.0417g of graphene oxide in 100ml of deionized water, ultrasonically disperse it for 45min to make it evenly dispersed, and then spray dry it. The inlet temperature is 200°C and the outlet temperature is 110°C. Ionized water to obtain a composite material of graphene oxide and silicon; then place it in a high-temperature furnace, feed a mixed gas of hydrogen and argon, the volume content of hydrogen in the mixed gas of hydrogen and argon is 20%, and first raise the temperature Carry out high-temperature annealing treatment at 700°C, keep warm for 3 hours to reduce graphene oxide, and then cool naturally to room temperature to obtain a silicon-graphene composite negative electrode material for a lithium-ion battery. In the above preparation process, the added graphene oxide was finally reduced to generate graphene, and its loss rate was 40%.

[0041] Wherein the preparation of graphene oxide: 0.3 gram par...

Embodiment 2

[0045] Disperse 0.1g of silicon powder (average particle size 150nm) and 0.0017g of graphene oxide in 100ml of methanol, ultrasonically for 60min to disperse evenly, and then spray dry, the inlet temperature is 220°C, the outlet temperature is 140°C, methanol is removed, Obtain a composite material of graphene oxide and silicon; then place it in a high-temperature furnace, pass nitrogen gas, first raise the temperature to 1100 ° C for high-temperature annealing treatment, and keep it warm for 10 hours to reduce graphene oxide, and then naturally cool to room temperature, A silicon-graphene composite negative electrode material for a lithium ion battery is obtained, and the material forms spherical composite particles with a diameter of about 500 nm. In the above preparation process, the added graphene oxide was finally reduced to generate graphene, and its loss rate was 40%.

[0046] Wherein the preparation of graphene oxide: 0.3 gram of particle diameter is 30 micron flake gr...

Embodiment 3

[0049] Disperse 0.1g of silicon powder (average particle size 200nm) and 1.5g of graphene oxide in 200ml of ether, ultrasonically disperse it for 50min to make it evenly dispersed, then spray dry, the inlet temperature is 120°C, the outlet temperature is 80°C, remove the ether, Obtain a composite material of graphene oxide and silicon; then place it in a high-temperature furnace, pass a mixed gas of hydrogen and argon, the volume content of hydrogen in the mixed gas of hydrogen and argon is 1%, and first raise the temperature to 500°C Perform high-temperature annealing treatment, keep warm for 1 hour to reduce graphene oxide, and then cool naturally to room temperature to obtain a silicon-graphene composite negative electrode material for lithium-ion batteries, which forms spherical composite particles with a diameter of about 15 μm. In the above preparation process, the added graphene oxide was finally reduced to generate graphene, and its loss rate was 40%.

[0050] Wherein ...

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Abstract

The invention discloses a silicon graphene composite anode material of a lithium ion battery and a preparation method of the silicon graphene composite anode material. The material consists of the following components in percentage by weight: 10 to 99 percent of silicon powder with the particle size of between 20 nanometers and 5 micrometers, 1 to 90 percent of graphene and 0 to 40 percent of amorphous carbon, wherein the graphene forms a three-dimensional conducting network with an internal cavity, and wraps the silicon powder in the internal cavity to form spherical or sphere-like composite particles with the particle size of between 500 nanometers and 15 micrometers. The preparation method of the material comprises the following steps of: uniformly dispersing the silicon powder and graphene oxide in a solvent; and performing spray drying, reducing, and cladding by using the amorphous carbon. Compared with the prior art, the invention has the advantages that: the material has high capacity and high cycle performance and is subjected to a constant-current charge-discharge test at the current density of 200mA/g, the reversible capacity of the material after 30-times circulation is still 1502mA/g, and the capacity retention rate of the material is up to 98 percent; and the preparation method is simple and practicable, high in yield and suitable for mass industrial production.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method thereof, in particular to a lithium-ion battery silicon-graphene composite negative electrode material and a preparation method thereof. Background technique [0002] With the depletion of non-renewable energy sources such as fossil fuels, people are increasingly demanding new types of renewable clean energy and energy storage and conversion technologies. Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect. They have been widely used in portable electronic devices such as mobile phones and notebook computers, and are expected to be used in electric vehicles, new energy storage and other fields. However, the theoretical specific capacity of graphite-based carbon anode materials currently commercialized is only 372 mAh / g, which limits the further improvement of the energy density of lithium-ion batteries. The theoretical cap...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 何雨石杨军高鹏飞马紫峰
Owner 浙江钠创新能源有限公司
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