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Preparation method of lithium ion battery negative electrode material

A lithium-ion battery and silicon negative electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low battery first efficiency, high oxygen content, poor cycle performance, etc., achieve rapid deintercalation and transfer, and high specific surface area , the effect of improving the conductivity

Active Publication Date: 2016-08-17
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology by pulverizing SiO X The performance of the battery has been improved to a certain extent, but this method still has the disadvantages of high oxygen content, which leads to low first efficiency and poor cycle performance of the battery.

Method used

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  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material

Examples

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preparation example Construction

[0026] The silicon negative electrode material preparation method of lithium ion battery negative electrode material of the present invention comprises the following steps:

[0027] Put silicon monoxide into the reactor, feed inert gas and raise the temperature to 800°C-1100°C at a rate of 1-10°C / min, control the reaction temperature at 800°C-1100°C, keep the temperature constant for 3h-10h, and make the reactor fully react within;

[0028] After the reaction is completed, cool to room temperature, transfer to a container, then treat with acid or alkali, wash and dry to obtain silicon particles;

[0029] Put the above-mentioned silicon particles into the reactor again, feed carbon source gas with a flow rate of 1g / min to 20g / min, and carry out carbon coating at a temperature of 300°C to 1000°C, and the carbon coating reaction time is 0.1h to 1h After the carbon coating is completed, cool to room temperature to obtain a carbon-coated silicon negative electrode material. The si...

Embodiment 1

[0039] Prepare lithium ion battery negative electrode material by above-mentioned preparation method of the present invention:

[0040] Put 1kg of SiO powder into the reaction furnace, pass inert gas, and increase the temperature at 5°C / min to 900°C, keep the temperature at a constant temperature for 6 hours to fully react in the reaction furnace and cool to room temperature, transfer the sample to the container, Treat with hydrofluoric acid for 5 hours, then wash and dry to obtain silicon particles of nano-silicon material;

[0041] Put the above-mentioned silicon particles into the reactor again, pass in an inert gas, then heat up to 500°C at a rate of 5°C / min, and then pass in an acetylene gas with a flow rate of 10g / min to treat the silicon negative electrode material. Carbon coating, constant temperature for 0.5h, and then cooling to room temperature to obtain a carbon-coated nano-silicon material, that is, the silicon negative electrode material of the present invention. ...

Embodiment 2

[0045] Prepare lithium ion battery negative electrode material by above-mentioned preparation method of the present invention:

[0046] Put 1kg of SiO powder into the reaction furnace, pass inert gas, and increase the temperature at 1°C / min to 800°C, keep the temperature at a constant temperature for 10 hours to fully react in the reaction furnace, then cool to room temperature, transfer the sample to the container, Treat with sodium hydroxide for 3h, then wash and dry to obtain silicon particles of nano-silicon material;

[0047] Put the above-mentioned silicon particles into the reactor again, pass inert gas, then heat up to 300°C at a rate of 2°C / min, and then pass in acetylene gas with a flow rate of 10g / min to treat the silicon negative electrode material. Carbon coating, constant temperature for 1 hour, and cooling to room temperature to obtain a carbon-coated nano-silicon material, that is, the silicon negative electrode material of the present invention.

[0048] The ...

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Abstract

The invention provides a lithium ion battery negative electrode material and a preparation method thereof. The negative electrode material comprises a silicon negative electrode material SiOx with 20-100nm primary particles and a specific surface area of 50-170m<2> / g, wherein 0<x<0.1. The preparation method comprises the steps that: silicon monoxide is subjected to a reaction under a constant temperature of 800-1100 DEG C in an inert atmosphere; when the reaction is finished, the product is cooled to room temperature, and is subjected to impurity removing by using acid or alkali; the product is washed and dried, such that silicon particles are obtained; the silicon particles are subjected to carbon cladding under an inert atmosphere, and is cooled to room temperature. The lithium ion battery negative electrode material provided by the invention has high discharge capacity and circulation performance, and high stability. As a result of experiments, first discharge capacity of the lithium ion battery negative electrode material can be 2050mAh / g.

Description

technical field [0001] The invention belongs to the technical field of new energy and relates to an energy storage electrode material, in particular to a negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] The main constituent materials of lithium-ion batteries include electrolyte, separator materials, positive and negative electrode materials, etc. The anode material occupies a large proportion, because the performance of the anode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery. Currently commercialized anode materials such as graphite, hard carbon, lithium titanate, etc. Due to factors such as low theoretical capacity of graphite materials, high selectivity to electrolyte, and poor high-current discharge performance, people are trying to find materials that can replace it. Now, lithium titanate materials with outstanding cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 周明炯
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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