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Silicon-oxygen composite negative electrode material and preparation method thereof, and lithium ion battery

A negative electrode material, silicon oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as complex coating process, no breakthrough in performance improvement, high coating cost, etc.

Active Publication Date: 2022-04-22
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide is also one of the common coating materials. The first effect and capacity have been improved to a certain extent. However, the high coating cost and complicated coating process limit its use, and at the same time, no breakthrough has been made in performance improvement.

Method used

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  • Silicon-oxygen composite negative electrode material and preparation method thereof, and lithium ion battery
  • Silicon-oxygen composite negative electrode material and preparation method thereof, and lithium ion battery
  • Silicon-oxygen composite negative electrode material and preparation method thereof, and lithium ion battery

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preparation example Construction

[0077] Second aspect, such as figure 1 As shown, the application provides a method for preparing a silicon-oxygen composite negative electrode material, comprising the following steps:

[0078] S100, mixing the precursor with the pre-lithiated carbon-coated silicon-oxygen material, and performing a solid-state thermal reaction under a protective atmosphere to obtain a silicon-oxygen composite negative electrode material; the precursor includes a mixture of a phosphate ion-containing compound and a metal compound , metal phosphate, at least one of a mixture of a silicate ion compound and a metal compound, and a metal silicate; the silicon-oxygen composite negative electrode material includes a silicon-oxygen material and a composite coating layer formed on the surface of the silicon-oxygen material, The composite coating layer includes a carbon material and a lithium-containing compound, the carbon material has pores, and the lithium-containing compound is filled in the pores. ...

Embodiment 1

[0128] (1) react carbon-coated silicon-oxygen material SiO / C with metal lithium to obtain pre-lithiated carbon-coated silicon-oxygen material Li-SiO / C, wherein the lithium content is 10 wt%;

[0129] (2) Put V 2 o 5 Mix with phosphoric acid in a molar ratio of 1:3 to obtain a precursor;

[0130] (3) After high-speed dispersion of 5g precursor and 100g Li-SiO / C, under the protection of Ar gas, roast at 900°C for 6 hours, control the heating rate at 2°C / min, disperse and sieve after natural cooling to obtain silicon Oxygen composite anode material.

[0131] The average particle size (D 50 ) is 5.13μm, and the tap density is 0.98g / cm 3 , the specific surface area is 2.19m 2 / g, the porosity is 1.98%, and the carbon content is 5.0wt%. The composite coating layer of the silicon-oxygen composite negative electrode material is 100nm, and the lithium-containing compound is mainly Li 3 V 2 (PO 4 ) 3 , the lithium-containing compound is dispersed and filled in the pores of the...

Embodiment 2

[0133] (1) react carbon-coated silicon-oxygen material SiO / C with metal lithium to obtain pre-lithiated carbon-coated silicon-oxygen material Li-SiO / C, wherein the lithium content is 10 wt%;

[0134] (2) MgO and SiO 2 Mix according to the molar ratio of 1:1 to obtain the precursor;

[0135] (3) After high-speed dispersion of 5g precursor and 100g Li-SiO / C, under the protection of Ar gas, bake at 700°C for 6 hours, control the heating rate at 2°C / min, disperse and sieve after natural cooling to obtain silicon Oxygen composite anode material.

[0136] The average particle diameter (D 50 ) is 5.12μm, and the tap density is 0.98g / cm 3 , the specific surface area is 2.17m 2 / g, the porosity is 1.99%, and the carbon content is 5.0wt%. The composite coating layer of the silicon-oxygen composite negative electrode material is 100nm, wherein the lithium-containing compound includes Li 2 MgSiO 4 , the lithium-containing compound is dispersed and filled in the pores of the carbon ...

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Abstract

The present application relates to a silicon-oxygen composite negative electrode material and a preparation method thereof, and a lithium-ion battery, wherein the silicon-oxygen composite negative electrode material includes a silicon-oxygen material, a composite coating layer coated on the surface of the silicon-oxygen material, and a composite coating layer It includes a carbon material and a lithium-containing compound, the carbon material has pores, and the lithium-containing compound is filled in the pores. The silicon-oxygen composite negative electrode material of the present application and its preparation method are simple, low in cost, and easy to realize industrial production, and the prepared silicon-oxygen composite negative electrode material has excellent electrochemical cycle and expansion inhibition performance, and can prolong the service life of lithium-ion batteries .

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, and relates to a silicon-oxygen composite negative electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Silicon oxide material is an essential anode material in a new generation of ultra-large capacity lithium-ion batteries. The silicon oxide industry has been researching and laying out the development of silicon-based lithium-ion batteries for more than ten years. However, silicon-based materials represented by silicon oxide have not been used on a large scale. The main factor limiting the application of silicon oxide materials is caused by the natural disadvantages of silicon-based materials. High expansion and drastic volume change, low first effect, etc. are all problems that need to be solved urgently. [0003] Interfacial reaction regulation is one of the important directions to suppress the expansion of the pole piece an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10H01M4/36H01M4/5825H01M4/485H01M4/364H01M4/48H01M10/052H01M4/1395H01M4/38H01M4/131H01M2004/027H01M2004/021H01M4/382H01M4/587H01M4/386H01M4/134
Inventor 谢维庞春雷邓志强任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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