Lithium ion battery silicon substrate composite negative electrode materials and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as affecting electrode cycle stability, improve cycle stability, reduce contact resistance, enhance cycle stability and specific capacity Effect

Active Publication Date: 2015-06-03
云南前沿液态金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the negative electrode composed of pure silicon powder is accompanied by a very large volume change during the process of lithium intercalation and deintercalation, which affects the cycle stability of the electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The composition and percentage of the lithium-ion battery silicon-based composite negative electrode material (silicon / magnesia / graphene composite negative electrode material) prepared in this example is silicon: magnesium oxide: the ratio of graphene is 25.5 wt%: 72.5 wt%: 2wt%. The specific preparation method is as follows:

[0023] (1) SiO with a particle size of 5 nm 2 Carry out weighing proportioning with 100 mesh magnesium powder according to molar ratio 1:2;

[0024] (2) Ball mill the mixture in step (1) under the protection of argon (the mass ratio of the ball to the mixture is 20:1) and mix it for 10 hours (rotation speed: 1000 rpm), and then place it in a flowing Ar atmosphere to The heating rate of 10°C / min reaches the required temperature of 600°C, and the temperature is kept for 10 hours;

[0025] (3) In 95%Ar / 5%H 2 Under protection, with methane as the carbon source, the Si / MgO composite material prepared in step (2) was kept at a tem...

Embodiment 2

[0026] Embodiment 2: The composition and percentage of the lithium-ion battery silicon-based composite negative electrode material (silicon / magnesia / graphene composite negative electrode material) obtained in this embodiment are: silicon: magnesium oxide: the ratio of graphene is 24.2 wt%: 68.8 wt% : 7 wt%. The specific preparation method is as follows:

[0027] (1) SiO with a particle size of 2 microns 2 Carry out weighing ratio with 150 mesh magnesium powder according to molar ratio 1:2;

[0028] (2) Ball mill the mixture in step (1) under the protection of argon (the mass ratio of the ball to the mixture is 20:1) and mix it for 15 hours (rotation speed: 700 rpm), and then place it in a flowing Ar atmosphere to The heating rate of 10°C / min reaches the required temperature of 650°C, and the temperature is kept for 6 hours;

[0029] (3) In 95%Ar / 5%H 2 Under protection, with methane as the carbon source, the Si / MgO composite material prepared in step (2) was kept at a te...

Embodiment 3

[0030] Embodiment 3: The composition and percentage of the silicon-based composite negative electrode material (silicon / magnesia / graphene composite negative electrode material) of the lithium-ion battery obtained in this embodiment are: silicon: magnesium oxide: the ratio of graphene is 23 wt%: 65 wt% : 12 wt%. The specific preparation method is as follows:

[0031] (1) SiO with a particle size of 10 microns 2 Carry out weighing ratio with 200 mesh magnesium powder according to molar ratio 1:2;

[0032](2) Ball mill the mixture in step (1) under the protection of argon (the mass ratio of the ball to the mixture is 1:1) and mix it for 20 hours (rotation speed: 100 rpm). %H 2 In the atmosphere, reach the required temperature of 700°C at a heating rate of 10°C / min, and hold for 4 hours;

[0033] (3) In 95%Ar / 5%H 2 Under protection, using methane as a carbon source, the Si / MgO composite material prepared in step (2) was kept at a temperature of 1100 °C and a system pressur...

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Abstract

The invention provides lithium ion battery silicon substrate composite negative electrode materials and a preparation method of the lithium ion battery silicon substrate composite negative electrode materials, and belongs to the technical field of lithium ion batteries. The prepared lithium ion battery silicon substrate composite negative electrode materials comprise, 23-56 wt% of silicon, 12.1-75.4 wt% of magnesium oxide and 2-12 wt% of graphene. A magnesiothermic reduction method is adopted, and magnesium powder serves as a reducing agent for reducing oxide of silicon (SiOx, and x is larger than 0.5 and smaller than 2) to prepare silicon / magnesium oxide composite materials. Then, the magnesium oxide attached on a reaction product on the surface of the silicon serves as a catalyst. A carbon source is adopted to carry out catalytic chemical vapor deposition so as to generate the graphene. The silicon / magnesium / graphene composite negative electrode materials are prepared. According to a prepared silicon substrate lithium ion battery, after magnesiothermic reduction is carried out on the oxide of the silicon, the magnesium oxide is generated on the interior of the oxide of the silicon, a volume effect of the silicon is relieved, the magnesium oxide generated on the interior and the exterior of the oxide of the silicon has the function of the catalyst, the graphene is catalyzed and generated, the volume effect of the silicon can be further relieved, and electrical conductivity of the materials is remarkably strengthened.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and provides a preparation method for silicon-based composite negative electrode materials of lithium ion batteries. Background technique [0002] With the rapid development of electronics and information industries, mobile communications, digital cameras and portable computers have been widely used, which has led to the rapid development of lithium-ion batteries, the devices that provide energy for the above-mentioned devices. Compared with traditional nickel-metal hydride batteries and nickel-cadmium batteries, lithium-ion batteries have the advantages of high energy density, high working voltage, small self-discharge, fast charging and discharging, and good safety performance. They are the fastest growing and brightest market prospects. A secondary battery. [0003] At present, the negative electrodes of commercialized lithium-ion batteries mainly use carbonaceous mat...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48
CPCY02E60/10
Inventor 刘树和赵淑春
Owner 云南前沿液态金属研究院有限公司
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