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

A negative electrode material and silicon-oxygen technology, which is applied in the field of silicon-oxygen composite negative electrode material and its preparation, can solve the problems of affecting the quality of the pole piece, the loss of active silicon, and the reduction of battery capacity, so as to improve the depth of lithium intercalation, reduce internal resistance, prevent the effect of the loss

Pending Publication Date: 2022-05-10
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon-based materials, in a strong alkaline environment, will undergo redox reactions to release hydrogen, and the oxidized active silicon will be lost to become dead silicon, resulting in a decrease in battery capacity, and the released hydrogen will affect the slurry coating process. Pole piece quality

Method used

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

Examples

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preparation example Construction

[0083] 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:

[0084] S100, performing surface etching treatment on the pre-lithiated silicon oxide material;

[0085] S200, mixing the silicon-oxygen material after the surface etching treatment with a compound containing metal M, and performing a solid-phase thermal reaction under a protective atmosphere to obtain a silicon-oxygen composite negative electrode material;

[0086] The silicon-oxygen composite negative electrode material includes an active material, and the active material includes a skeleton structure that runs through the active material and a silicon-oxygen material distributed on the skeleton structure; the skeleton structure includes silicon that is located inside the active material. A lithium acid skeleton and a water-insoluble silicate skeleton located on the surface of the active mat...

Embodiment 1

[0134] (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 10wt%;

[0135] (2) Soak the pre-lithiated material in 10wt% citric acid solution for 1 hour, etch the surface, then filter it with suction, and dry it in a dry environment at 80°C for 24 hours;

[0136] (3) Add magnesia (5g) and surface-etched pre-lithium silicon oxide (100g) into a ball mill, and after ball milling for 12 hours, transfer to a graphite crucible, treat at 850°C for 10 hours under a protective atmosphere, and then crush Sieve and classify to obtain the silicon-oxygen composite negative electrode material.

[0137] The silicon-oxygen composite negative electrode material prepared in this embodiment includes an active material and a carbon layer formed on the surface of the active material. The active material includes a skeleton structure and a silicon-oxygen material embedded in th...

Embodiment 2

[0140] (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 10wt%;

[0141] (2) Soak the pre-lithiated material in 10wt% citric acid solution for 1 hour, etch the surface, then filter it with suction, and dry it in a dry environment at 80°C for 24 hours;

[0142] (3) Add magnesia (2.5g), lithium carbonate (4.6g) and pre-lithium silicon oxide (100g) after surface etching into the ball mill together. After ball milling for 12 hours, transfer them to graphite crucible. After being treated at 850°C for 10 hours, it was crushed, sieved and classified to obtain a silicon-oxygen composite negative electrode material.

[0143] The silicon-oxygen composite negative electrode material prepared in this embodiment includes an active material and a carbon layer formed on the surface of the active material. The active material includes a skeleton structure and a silicon...

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Abstract

The invention relates to a silicon-oxygen composite negative electrode material and a preparation method thereof, and a lithium ion battery, the silicon-oxygen composite negative electrode material comprises an active material, the active material comprises a skeleton structure and a silicon-oxygen material embedded on the skeleton structure; the skeleton structure comprises a lithium silicate skeleton located in the active material and a water-insoluble silicate skeleton located on the surface layer of the active material, the water-insoluble silicate skeleton is connected with the lithium silicate skeleton, and in an XRD pattern of the silicon-oxygen composite negative electrode material, the intensity of the strongest diffraction characteristic peak of lithium silicate is IA, and the intensity of the strongest diffraction characteristic peak of lithium silicate is IB; the intensity of the strongest diffraction characteristic peak of the water-insoluble silicate is IB, and IB / IA is more than or equal to 0.03 and less than or equal to 0.2. The silicon-oxygen composite negative electrode material and the preparation method thereof have the advantages of simplicity, low cost and easy realization of industrial production, and the prepared silicon-oxygen composite negative electrode material can improve the processing performance, has excellent electrochemical cycle and expansion inhibition performance, and can prolong the service life of a lithium ion battery.

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 negative electrode material in the development of 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-based materials is the natural disadvantages of silicon-based materials themselves. High expansion and drastic volume change, low first effect, magnification, etc. are all problems that need to be solved urgently. Metal doping of the silicon-based core is one of the most direct improveme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525C01B33/32C01B33/12C01B33/20C01B33/26C01B32/05
CPCH01M4/483H01M4/624H01M4/628H01M10/0525C01B33/32C01B33/12C01B33/20C01B33/26C01B32/05C01P2004/80C01P2002/72C01P2006/11C01P2006/12C01P2004/61C01P2006/40Y02E60/10C01B33/113C01P2002/74H01M2004/027H01M4/5825H01M4/366H01M4/364H01M4/36H01M4/485H01M4/131H01M4/625H01M4/62H01M4/1391C01B33/22C01B33/325C01P2002/08C01P2004/84H01M4/382H01M4/583H01M2004/021
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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