Preparing method of nanometer silicon particles for lithium battery

A technology of nano-silicon and silicon particles, which is applied in the field of nano-material preparation and new energy, can solve the problems of loss of conductive environment, capacity decay, low conductivity of silicon, etc.

Inactive Publication Date: 2019-07-30
江苏载驰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although silicon-based anode materials have significant advantages, similar to other high specific capacity anodes, the disadvantages of silicon materials are also very prominent: first, silicon has a severe volume effect (volume change greater than 300%) during charge/discharge, and the material The continuou

Method used

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  • Preparing method of nanometer silicon particles for lithium battery

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Experimental program
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Effect test

Embodiment 1

[0019] N-type heavily doped crystalline silicon (0.01 Ω·cm) was selected as the workpiece electrode, a copper tube was used as the tool electrode, and deionized water was selected as the working fluid. The pulse width of the discharge pulse generated by the pulse power supply is 100μs, the duty ratio is 1:4, and the rectangular pulse voltage with an open circuit voltage of 160V is applied between the workpiece electrode and the tool electrode, and ionizes and breaks down the insulating working medium to form a plasma discharge channel. Micron or submicron silicon particles are obtained after the high-temperature melting and gasification workpiece electrodes are condensed. After filtering with a centrifuge, silicon particles with a median particle size of about 3.2 µm were obtained.

[0020] Use high-energy ball milling to further refine the collected micron or submicron silicon particles, use ethanol as a dispersion medium, prepare a silicon slurry with a solid content of 10%,...

Embodiment 2

[0022] N-type heavily doped crystalline silicon (0.01 Ω·cm) was selected as the workpiece electrode, a copper tube was used as the tool electrode, and deionized water was selected as the working fluid. The pulse width of the discharge pulse generated by the pulse power supply is 150μs, the duty ratio is 1:4, and the rectangular pulse voltage with an open circuit voltage of 300V is applied between the workpiece electrode and the tool electrode, and ionizes and breaks down the insulating working medium to form a plasma discharge channel. Micron or submicron silicon particles are obtained after the high-temperature melting and gasification workpiece electrodes are condensed. After filtering with a centrifuge, silicon particles with a median diameter of about 10 µm were obtained.

[0023] The collected micron or submicron silicon particles are further refined by high-energy ball milling, acetone is used as the dispersion medium, and a silicon slurry with a solid content of 25% is ...

Embodiment 3

[0025] P-type heavily doped crystalline silicon (0.01 Ω·cm) was selected as the workpiece electrode, copper tube was used as the tool electrode, and deionized water was selected as the working fluid. The pulse width of the discharge pulse generated by the pulse power supply is 100μs, the duty ratio is 1:4, and the rectangular pulse voltage with an open circuit voltage of 180V is applied between the workpiece electrode and the tool electrode, and ionizes and breaks down the insulating working medium to form a plasma discharge channel, resulting in Micron or submicron silicon particles are obtained after the high-temperature melting and gasification workpiece electrodes are condensed. After filtering with a centrifuge, silicon particles with a median diameter of about 10 µm were obtained.

[0026] The collected micron or submicron silicon particles are further refined by high-energy ball milling, methanol is used as a dispersion medium, and a silicon slurry with a solid content ...

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Abstract

The invention discloses a preparing method of nanometer silicon particles which are doped with trace elements and used for a lithium battery. The doped trace elements are N-type doped crystalline silicon and P-type doped crystalline silicon. The preparing method comprises the steps that firstly, the N-type doped crystalline silicon and the P-type doped crystalline silicon serve as raw materials, acopper pipe serves as a working electrode, a pulse discharge method is adopted for preparing the micron/sub-micron silicon particles doped with the trace elements, and the intrinsic conductivity of silicon is increased by doping the trace elements. Afterwards, the prepared micron/sub-micron silicon particles doped with the trace elements are further nanocrystallized through a high-energy ball milling method, so that the absolute volume change of the silicon particles is reduced. By means of the method, the circulation performance of the silicon material can be improved. The method is simple in preparing technology, convenient to operate and low in cost, and expanded production is facilitated.

Description

technical field [0001] The invention relates to the field of nano material preparation and new energy, in particular to a preparation method of nano-silicon particles for lithium batteries doped with trace elements. Background technique [0002] Lithium-ion batteries are widely used as power sources for portable consumer electronics (mobile phones, laptops, cameras, etc.) due to their high energy density, safety, environmental protection, and long life. In recent years, the development of pure electric vehicles, plug-in hybrid electric vehicles and large-scale distributed energy storage power stations has put forward higher requirements for the energy density, safety and cycle stability of lithium-ion batteries. The main ways to improve the energy density of lithium-ion batteries include the development of positive / negative electrode materials with high specific capacity and the development of high-voltage positive electrode materials. In terms of negative electrodes, the t...

Claims

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Application Information

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IPC IPC(8): C01B33/021B82Y40/00H01M4/38
CPCB82Y40/00C01B33/021H01M4/364H01M4/386Y02E60/10
Inventor 赵明才张娟汪炜
Owner 江苏载驰科技股份有限公司
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