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Treatment method of pre-lithiated SiOx negative electrode material

A technology of negative electrode material and processing method, which is applied in the processing field of pre-lithiated SiOx negative electrode material and can solve the problems of poor stability of pre-lithiated SiOx negative electrode material and the like

Pending Publication Date: 2020-12-18
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the pre-lithiated SiOx anode material formed by supplementing lithium at the material end is poor.

Method used

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  • Treatment method of pre-lithiated SiOx negative electrode material
  • Treatment method of pre-lithiated SiOx negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The processing method of the pre-lithiated SiO negative electrode material of the present embodiment is as follows:

[0059] 1) Mix 100g 6μm SiO with 10g Li 2 O was mixed by mechanical ball milling for 3 hours, and then calcined at 500°C for 2 hours under the protection of nitrogen in an inert atmosphere to obtain a pre-lithiated SiOx negative electrode material, which was designated as sample S1;

[0060] Take 100g of S1 with a particle size of 6 μm and a carbon coating amount of 3wt%, and take NH 4 F 5g, stir at room temperature for 1 hour, mix well, then put the mixed sample in a tube furnace, feed nitrogen gas at a rate of 50mL / min, start heating to 190°C after half an hour of nitrogen gas feeding, the heating rate Control the temperature at 30°C / min, raise the temperature to 190°C, keep it warm for 0.5h, grind and sieve the obtained powder, and finally obtain a pre-lithiated SiOx negative electrode material coated with a layer of LiF on the surface, which is desig...

Embodiment 2

[0062] The processing method of the pre-lithiated SiO negative electrode material of the present embodiment is as follows:

[0063] Mix 10g of biphenyl with 100g of tetrahydrofuran, then add 0.5g of metal lithium powder to obtain an organic solution containing metal lithium, then add 10g of 6μm SiO, stir for 12h, filter, and wash with tetrahydrofuran to obtain a pre-lithiated SiOx negative electrode material, which is denoted as Sample S2;

[0064] Take 100g of S2 with a particle size of 6 μm and a carbon coating amount of 3wt%, and take NH 4 F 5g, stir at room temperature for 1 hour, mix well, then put the mixed sample in a tube furnace, feed nitrogen gas at a rate of 50mL / min, start heating to 190°C after half an hour of nitrogen gas feeding, the heating rate Control the temperature at 30°C / min, raise the temperature to 190°C, keep it warm for 0.5h, grind and sieve the obtained powder, and finally obtain a pre-lithiated SiOx negative electrode material coated with a layer o...

Embodiment 3

[0066] The processing method of the pre-lithiated SiO negative electrode material of the present embodiment is as follows:

[0067] Mix 100g of 6μm SiO negative electrode with 5g of metallic lithium powder, then add 100g of electrolyte to it, and let it stand at room temperature for 12h to obtain the pre-lithiated SiOx negative electrode material, which is designated as sample S3, wherein the solute of the electrolyte is 1.2mol / L Lithium hexafluorophosphate, the solvent is ethylene carbonate EC;

[0068] Take 100g of S3 with a particle size of 6 μm and a carbon coating amount of 3wt%, and take NH 4 F 5g, stir at room temperature for 1 hour, mix well, then put the mixed sample in a tube furnace, feed nitrogen gas at a rate of 50mL / min, start heating to 190°C after half an hour of nitrogen gas feeding, the heating rate Control the temperature at 30°C / min, raise the temperature to 190°C, keep it warm for 0.5h, grind and sieve the obtained powder, and finally obtain a pre-lithiat...

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Abstract

The invention relates to a treatment method of a pre-lithiated SiOx negative electrode material. The treatment method of the pre-lithiated SiOx negative electrode material comprises the following steps: mixing the pre-lithiated SiOx negative electrode material with a first solid compound to obtain a first mixture, X being greater than 0 and less than 2, and the first solid compound being selectedfrom at least one of ammonium fluoride and ammonium phosphate; under the atmosphere of protective gas, carrying out heat preservation sintering on the first mixture the temperature of 50 to 300 DEG Cto obtain the first pre-lithium-silicon negative electrode material. According to the treatment method of the pre-lithiated SiOx negative electrode material, the stability of the pre-lithiated SiOx negative electrode material can be improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a treatment method for pre-lithiated SiOx negative electrode materials. Background technique [0002] As people's requirements for the cruising range of electric vehicles are getting higher and higher, the energy density of passenger car battery systems needs to be continuously improved. Traditional graphite anodes can no longer meet the current energy density requirements of power batteries. Due to the high gram capacity of silicon-based anodes, silicon-based anodes have become key research materials. [0003] Compared with pure Si anode, silicon oxide compound SiO x With higher gram capacity, lower expansion and better cycle life, it is regarded as the next generation of anode materials. However, the traditional silicon oxide compound SiO x There is a problem of low first effect, which seriously restricts its commercial application. At present, there are two main ways to i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M10/42
CPCH01M4/366H01M4/483H01M10/4235H01M2004/027Y02E60/10
Inventor 陈鹏褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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