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Modified silicon-based material, preparation method thereof and lithium battery negative electrode material

A technology of silicon-based materials and modified silicon, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex process, silicon anode materials can not take into account the rate performance, cycle performance and first coulombic efficiency, etc., to achieve good comprehensive performance Effect

Pending Publication Date: 2022-02-15
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
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Problems solved by technology

[0010] The main purpose of the present invention is to provide a modified silicon-based material and its preparation method, and lithium battery negative electrode material, to solve the problem of complex process or complex process when doping modified silicon-based materials in the prior art, or the inability of the prepared silicon negative electrode material Good rate performance, cycle performance, first Coulombic efficiency and other issues

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  • Modified silicon-based material, preparation method thereof and lithium battery negative electrode material
  • Modified silicon-based material, preparation method thereof and lithium battery negative electrode material

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[0025] As described in the background technology section, the process of doping modified silicon-based materials in the prior art is either complicated, or the prepared silicon anode material cannot take into account good rate performance, cycle performance, and first Coulombic efficiency. In order to solve the above problems, the present invention provides a method for preparing a modified silicon-based material, which includes the following steps: Step S1, using a hydrothermal method to dope the silicon-based material with a dopant to obtain a doped silicon-based material ; wherein the weight ratio of the dopant to the silicon-based material is (0.01-0.1): 1; step S2, dispersing the doped silicon-based material in water to form a dispersion, and adding an oxidizing agent and a conductive polymer unit to the dispersion body, followed by in-situ polymerization to obtain a modified silicon-based material.

[0026] In the preparation method, the silicon-based material is firstly...

Embodiment 1

[0042] Add 0.1 g of SiO material (average particle size about 6 μm) into deionized water, slowly add 0.005 g of H under stirring 3 BO 3 , and continued to stir for 3 hours, then transferred to a 150mL hydrothermal kettle after stirring evenly, the volume of the solution accounted for 60% of the kettle volume, and reacted at 140°C for 24h. It was then centrifuged and washed with water and ethanol in sequence to obtain a doped silicon-based material. Add the doped silicon-based material into deionized water, add 0.12g of ferric chloride and 0.05g of pyrrole successively under continuous stirring, and in-situ polymerize at 25°C for 2h (the thickness of the formed conductive polymer shell is about 0.3μm). Finally, the modified silicon-based material with a core-shell structure was obtained after centrifugal washing.

Embodiment 2

[0044] Add 0.1 g of SiO material (average particle size about 6 μm) into deionized water, slowly add 0.01 g of H under stirring 3 BO 3 , and continued to stir for 3 hours, then transferred to a 150mL hydrothermal kettle after stirring evenly, the volume of the solution accounted for 60% of the kettle volume, and reacted at 140°C for 24h. It was then centrifuged and washed with water and ethanol in sequence to obtain a doped silicon-based material. Add the doped silicon-based material into deionized water, add 0.12g of ferric chloride and 0.05g of pyrrole successively under continuous stirring, and in-situ polymerize at 25°C for 2h (the thickness of the formed conductive polymer shell is about 0.3μm). Finally, the modified silicon-based material with a core-shell structure was obtained after centrifugal washing.

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Abstract

The invention provides a modified silicon-based material, a preparation method thereof and a lithium battery negative electrode material. The preparation method comprises the following steps: S1, doping a silicon-based material with a dopant by adopting a hydrothermal method to obtain a doped silicon-based material, wherein the weight ratio of the dopant to the silicon-based material is (0.01-0.1): 1; S2, dispersing the doped silicon-based material in water to form a dispersion liquid, adding an oxidizing agent and a conductive polymer monomer into the dispersion liquid, and then performing in-situ polymerization reaction to obtain the modified silicon-based material. The silicon-based material is modified by using the preparation method, so that the rate capability, the cycle performance, the first coulombic efficiency and the like of the silicon-based material can be better considered on the basis of relatively simple procedures, and the negative electrode material has better comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a modified silicon-based material, a preparation method thereof, and a lithium battery negative electrode material. Background technique [0002] With the vigorous development of electric vehicles, the cruising range of lithium-ion batteries has become the key to restricting the improvement of people's travel quality of life. In lithium-ion batteries, the capacity of the positive and negative electrodes determines the overall capacity of the battery. Among them, the positive electrode capacity has reached a bottleneck, and it is difficult to make further breakthroughs. However, the capacity of graphite anode materials currently used is low, and there is a lot of room for improvement. Therefore, in order to further increase the capacity of lithium-ion batteries, it is a feasible way to find high-capacity anode materials to replace traditional graphite materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/60
CPCH01M4/366H01M4/386H01M4/602Y02E60/10
Inventor 汪杨何轩陈鹏褚春波
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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