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Method for preparing lithium battery SiO negative electrode material with high cycle performance

A technology of cycle performance and negative electrode material, applied in the direction of lithium battery, battery electrode, active material electrode, etc., can solve the problems of large volume expansion and cycle performance decline, reduce usage, improve specific capacity and cycle performance, and suppress volume The effect of the dilation effect

Active Publication Date: 2020-09-11
WANXIANG 123 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of large volume expansion and decreased cycle performance in the application of SiO materials in lithium battery negative electrode materials in the prior art, the purpose of the present invention is to provide a method for preparing SiO negative electrode materials for lithium batteries with high cycle performance, so as to alleviate the problem of SiO material The problems of large volume expansion and decreased cycle performance brought about by the application in negative electrode materials

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  • Method for preparing lithium battery SiO negative electrode material with high cycle performance
  • Method for preparing lithium battery SiO negative electrode material with high cycle performance
  • Method for preparing lithium battery SiO negative electrode material with high cycle performance

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Embodiment 1

[0031] A method for preparing a lithium battery SiO negative electrode material with high cycle performance, comprising the following steps:

[0032] (1) According to the mass ratio of 1:0.1, take SiO with a particle size of 1 μm and coal tar with a viscosity of 0.1 Pa·s respectively, add them to the kneader, raise the temperature to 120°C and stir and knead for 2 hours to coat the surface of silicon oxide A layer of organic carbon sources yields complex A;

[0033] (2) Transfer composite A, artificial graphite with a particle size of 10 μm, and high-viscosity pitch with a viscosity of 5 Pa s to a vertical granulation kettle through a vacuum device according to a mass ratio of 1:6:0.2, and feed an inert atmosphere at a stirring speed of 100 revolutions per minute, heat at a rate of 3 °C / min to 300 °C for 1 hour, and then heat at a rate of 5 °C / min to 700 °C for 2 hours, and obtain composite material B after natural cooling;

[0034] (3) The composite material B was transferre...

Embodiment 2

[0036] A method for preparing a lithium battery SiO negative electrode material with high cycle performance, comprising the following steps:

[0037] (1) According to the mass ratio of 1:0.2, take SiO with a particle size of 1 μm and coal tar with a particle size of 0.2 Pa s respectively, add them to the kneader, raise the temperature to 100 ° C and knead for 2 hours, so that the surface of silicon oxide is coated with a layer organic carbon source to obtain complex A;

[0038] (2) The composite A, artificial graphite with a particle size of 10 μm, and high-viscosity pitch with a viscosity of 2 Pa s are transferred to a vertical granulation kettle through a vacuum device according to a mass ratio of 1:7:0.2, and the inert atmosphere is stirred. The speed is 100 rpm, and the heating rate is raised to 300°C at a heating rate of 3°C / min for 1 hour, and then the heating rate is raised to 700°C for 2 hours at a heating rate of 5°C / min, and the composite material B is obtained after...

Embodiment 3

[0041] A method for preparing a lithium battery SiO negative electrode material with high cycle performance, comprising the following steps:

[0042] (1) According to the mass ratio of 1:0.8, take SiO with a particle size of 1 μm and coal tar with a viscosity of 0.05 Pa·s respectively, add them to the kneader, raise the temperature to 150°C and stir and knead for 2 hours, so that the surface of silicon oxide is covered with Cover a layer of organic carbon source to obtain complex A;

[0043] (2) Transfer the mixed material, artificial graphite with a particle size of 10 μm, and high-viscosity asphalt with a viscosity of 6 Pa s to a vertical granulation kettle through a vacuum device according to a mass ratio of 1:7:0.2 and pass it into an inert atmosphere , stirring at a speed of 100 rpm, heating at a rate of 3 °C / min to 300 °C for 1 hour, then raising the rate of temperature at 5 °C / min to 700 °C for 2 hours, and cooling naturally to obtain a composite material B;

[0044] (...

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Abstract

The invention relates to the technical field of lithium battery electrode materials. Aiming at the problems of large volume expansion and reduced cycle performance of an SiO material applied to a lithium battery negative electrode material, the invention discloses a method for preparing a lithium battery SiO negative electrode material with high cycle performance, which comprises the following steps: adding SiO and a low-viscosity carbon source into a kneading machine, heating, stirring and kneading to obtain a compound A; transferring the compound A, graphite and a high-viscosity carbon source into granulation equipment through vacuum equipment for inert atmosphere granulation to obtain a material B; and putting the material B into a calcining furnace, calcining at high temperature in aninert atmosphere, and naturally cooling to room temperature to obtain the SiO negative electrode material of the lithium battery. The dispersion performance of SiO and graphite in a high-viscosity carbon source is improved through the low-viscosity carbon source, so that SiO and graphite form a uniform dispersion effect, SiO is firmly bonded to the surface of graphite through residual carbon of the low-viscosity carbon source and residual carbon of the high-viscosity carbon source, the volume expansion effect is effectively inhibited, and the specific capacity and the cycle performance are improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials, in particular to a method for preparing SiO negative electrode materials for lithium batteries with high cycle performance. Background technique [0002] The negative electrode material of a lithium battery is one of the key factors that determine the performance of the lithium battery such as charge and discharge efficiency and cycle life. At present, commercial lithium batteries mainly use graphite as the negative electrode material. The specific capacity of high-end graphite materials on the market has reached 360-365mAh / g, which is close to the theoretical specific capacity of graphite (372mAh / g). Therefore, graphite is used as the negative electrode material. The space for improving the energy density of lithium batteries is limited, which cannot meet the requirements of high energy density of power batteries. Due to the high capacity (2600mAh / g) of SiO, the volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/052C01B33/12C01B32/21
CPCC01B33/12C01B32/21H01M4/366H01M4/483H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 单沈桃张小祝李慧苏敏
Owner WANXIANG 123 CO LTD
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