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

A silicon-based negative electrode material and silicon-based technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve problems such as unsatisfactory cycle and safety, easy decomposition of electrolyte, cycle performance, and unstable electrochemical performance. , to achieve enhanced structural stability and cycle performance, stable structure and electrochemical performance, and excellent cycle performance

Active Publication Date: 2021-06-15
SHENZHEN DYNANONIC +1
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a silicon-based negative electrode material and its preparation method, to solve the technical problems that the surface activity of the existing silicon-based negative electrode material leads to easy decomposition of the electrolyte and unsatisfactory cycle performance
[0006] Another object of the present invention is to provide a negative electrode and a lithium-ion battery containing the negative electrode, to solve the problems of unstable electrochemical performance, unsatisfactory cycleability and safety in existing lithium-ion batteries containing silicon-based negative electrodes. technical problem

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

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preparation example Construction

[0047] Correspondingly, the embodiment of the present invention also provides a preparation method of the above-mentioned silicon-based negative electrode material. The process flow of the preparation method of the silicon-based negative electrode material is as follows: figure 2 As shown, combined with figure 1 , its preparation method comprises the following steps:

[0048] Step S01: Mixing silicon-containing material powder and magnesium-containing material powder to form a mixture containing silicon and magnesium;

[0049] Step S02: Sintering the mixture to form a silicon-based material-containing core body 1 and a magnesium-containing coating layer covering the surface of the core body to obtain the first coated silicon-based granular material;

[0050] Step S03: forming a carbon-containing coating layer (shell layer 3) on the surface of the first coated silicon-based granular material to obtain a second coated silicon-based granular material;

[0051] Step S04: pickl...

Embodiment 1

[0093] This embodiment provides a silicon-based negative electrode material and a preparation method thereof. The structure of the silicon-based negative electrode material is as follows figure 1 As shown, it is a double-shell core-shell structure, and the material of the core body 1 is SiO x particles, whose D50 is 10 μm; the inner shell layer 2 is distributed with rich microporous structure, and the micropores contained in the microporous structure are arranged along the direction from the core body 1 to the outer shell layer 3, and the pore size of the micropores is determined by the core body 1 gradually increases toward the shell layer 3, the average pore diameter of the micropores is 1000nm, and its materials include magnesium oxide, Mg 2 SiO 4 , MgSiO 3 mixture, with an average thickness of 5nm; the shell layer 3 is a vapor-deposited conductive carbon layer, with an average thickness of 100nm.

[0094] The preparation method of silicon-based negative electrode mater...

Embodiment 2

[0100] This embodiment provides a silicon-based negative electrode material and a preparation method thereof. The structure of the silicon-based negative electrode material is as follows figure 1 As shown, it is a double-shell core-shell structure, and the material of the core body 1 is silicon microcrystal and amorphous silicon oxide SiO x A mixture of particles, the content of silicon microcrystals accounts for 2-30wt% of the total weight of silicon microcrystals and silicon oxides, and its D50 is 20 μm; there are abundant microporous structures distributed on the inner shell 2, and the microporous structures contained in the microporous structure The pores are arranged along the direction from the core body 1 to the outer shell layer 3, and the pore diameter of the micropores gradually increases from the core body 1 to the outer shell layer 3. The average pore diameter of the micropores is 2000nm, and its materials include magnesium oxide, Mg 2 SiO 4 , MgSiO 3 mixture, w...

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Abstract

The invention discloses a silicon-based negative electrode material, a preparation method thereof and a lithium ion battery. The silicon-based negative electrode material is of a core-shell structure, and the core-shell structure comprises a core body, an inner shell layer coating the core body and an outer shell layer coating the inner shell layer; and the core body is made of a silicon-based material, a microporous structure is distributed in the inner shell layer, the inner shell layer is made of a magnesium element, and the outer shell layer is made of a carbon element. The silicon-based negative electrode material is low in internal resistance and high in double-shell mechanical property, volume expansion of the silicon-based negative electrode material can be effectively inhibited, the structural stability can be kept in the charging and discharging process, decomposition of electrolyte can be reduced, and the cycle performance is excellent. The process conditions are easy to control, and the stable structure and performance of the prepared silicon-based negative electrode material can be ensured. The lithium ion battery contains the silicon-based negative electrode material, and has the advantages of excellent cycle performance, high safety, long service life and stable electrochemical performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a silicon-based negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] As people's awareness of environmental protection and energy crisis increases, lithium-ion batteries are becoming more and more popular as a green and environmentally friendly energy storage technology. Lithium-ion batteries have been widely utilized due to their high capacity density, long cycle life, and high stability. With the widespread application of electronic products and the vigorous development of electric vehicles, the market for lithium-ion batteries has become increasingly broad, but at the same time higher requirements have been put forward for the safety of lithium-ion batteries. [0003] At present, commercial lithium-ion batteries mainly use graphite-based negative electrode materials, but its theoretical specific ca...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/386H01M4/625H01M4/366H01M4/628H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 钟泽钦万远鑫孔令涌陈彩凤任望保朱成奔钟文张淤财
Owner SHENZHEN DYNANONIC
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