Magnesium-containing silicon oxide negative electrode material for lithium ion batteries and preparation method thereof

A lithium-ion battery, magnesium silicon oxide technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of difficult process control, poor cycle performance, industrial application, and poor cycle performance of materials, so as to achieve convenient production process Control, easy industrial application, and the effect of improving efficiency for the first time

Active Publication Date: 2019-10-08
洛阳联创锂能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned methods are all due to the addition of Mg, which causes the silicon grain size to be too large, and the process is difficult to control, resulting in poor material cycle performance; or due to various problems such as the process is more complicated and difficult to industrialize, although the initial efficiency is low after adding Mg. Significantly improved, but industrial application has not yet been realized due to poor cycle performance

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  • Magnesium-containing silicon oxide negative electrode material for lithium ion batteries and preparation method thereof

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Embodiment 1

[0019] The method for preparing a magnesium-containing silicon oxide negative electrode material for a lithium ion battery according to Embodiment 1 is characterized in that: it comprises the following steps:

[0020] 1) Weigh silicon powder and magnesium powder in a mass ratio of 1:1.7, wherein the silicon powder has a purity of more than 99.9%, a particle size of D50≤8μm, and the magnesium powder has a purity of more than 99.9% and a maximum particle size of no more than 300μm.

[0021] 2), add the silicon powder and magnesium powder weighed in step 1) into the inert gas protection type mixer for mixing, add the mixed materials into the rotary heating furnace, and vacuum the rotary heating furnace to below 0.05Pa, and the temperature is 10℃ / The heating rate of min was heated to 550°C, kept for 3h, and then cooled to room temperature to obtain magnesium silicide;

[0022] 3) Weigh the silicon monoxide powder, its purity is not less than 99.9%, and the particle size D50 is le...

Embodiment 2

[0023] The preparation method of the magnesium-containing silicon oxide negative electrode material for lithium ion batteries of the second embodiment is characterized in that: it comprises the following steps:

[0024] 1) Weigh silicon powder and magnesium powder according to the mass ratio of 1:1.73, in which the purity of silicon powder is over 99.9%, the particle size D50 is less than or equal to 8 μm, the purity of magnesium powder is over 99.9%, and the maximum particle size is not more than 300 μm.

[0025] 2), add the silicon powder and magnesium powder weighed in step 1) into the inert gas protection type mixer for mixing, add the mixed materials into the rotary heating furnace, and vacuum the rotary heating furnace to below 0.05Pa, and the temperature is 10℃ / The heating rate of min was heated to 600°C, kept for 4h, and then cooled to room temperature to obtain magnesium silicide;

[0026] 3) Weigh silicon monoxide powder, its purity is not less than 99.9%, particle ...

Embodiment 3

[0027] The preparation method of the magnesium-containing silicon oxide negative electrode material for lithium ion batteries of the third embodiment is characterized in that: it comprises the following steps:

[0028] 1) Weigh silicon powder and magnesium powder according to the mass ratio of 1:1.75, in which the purity of silicon powder is more than 99.9%, the particle size D50 is less than or equal to 8μm, the purity of magnesium powder is more than 99.9%, and the maximum particle size is not more than 300μm.

[0029] 2), add the silicon powder and magnesium powder weighed in step 1) into the inert gas protection type mixer for mixing, add the mixed materials into the rotary heating furnace, and vacuum the rotary heating furnace to below 0.05Pa, and the temperature is 10℃ / The heating rate of min is heated up to 650 ° C, kept for 3-5 h, and then cooled to room temperature to obtain magnesium silicide;

[0030] 3) Weigh silicon monoxide powder, its purity is not less than 99...

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Abstract

The invention relates to the field of lithium battery materials, and specifically relates to a magnesium-containing silicon oxide negative electrode material for lithium ion batteries and a preparation method thereof. The preparation method mainly comprises the steps of raw material preparation, magnesium silicide preparation and magnesium-containing silicon oxide negative electrode material preparation. The preparation method in the invention can realize batch production and is easy for industrial application. The lithium ion battery prepared by adopting the negative electrode material obtained according to the preparation method provided by the invention has excellent electrochemical properties such as high specific capacity and good cycle performance.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a magnesium-containing silicon oxide negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the wide application of lithium-ion batteries in mobile electronic devices such as mobile phones and notebook computers, and the demand for electric vehicles in environmental management, there is an urgent need to develop high-capacity negative electrode materials for lithium-ion batteries. [0003] Silicon-based anode materials have attracted widespread attention due to their ultra-high specific capacity. Through unremitting research in the past two decades, they have become the most industrialized and applied high-capacity anode materials. Among them, SiOx material has more practical potential due to its advantages in cycle life, so it is also the fastest high-capacity anode material for promotion and application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/48H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 陈志强高贵华
Owner 洛阳联创锂能科技有限公司
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