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Nano silicon-based material, and preparation method and application thereof

A nano-silicon, base material technology, applied in electrical components, battery electrodes, circuits, etc., to achieve the effects of low cost, short cycle, and reduced contact

Inactive Publication Date: 2019-03-15
ZOTYE INT AUTOMOBILE TRADING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nanonization and compounding can improve the cycle performance of silicon-based negative electrodes, it is still a big challenge to realize the simple and large-scale preparation of nano-silicon-based materials.

Method used

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  • Nano silicon-based material, and preparation method and application thereof
  • Nano silicon-based material, and preparation method and application thereof
  • Nano silicon-based material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of nano-silicon-based material, comprising the following steps:

[0043] 1) Mix the commercial crude silicon and sulfur powder evenly at a molar ratio of 1:2.05, seal them in a quartz tube under an argon atmosphere, then place the quartz tube in a tube furnace, and heat up to 1100°C, and kept at this temperature for 10 hours to obtain silicon sulfide;

[0044] 2) then the silicon sulfide prepared in step 1) is mixed with magnesium powder and sodium chloride through ball milling, the rotating speed is 180r / min, and the ball milling time is 10 hours to obtain a mixture; the mol ratio of the magnesium powder and silicon sulfide is 2: 1. The weight ratio of sodium chloride to silicon sulfide is 7:1.

[0045] 3) Put the mixture described in step 2) in a tube furnace, feed argon gas, and carry out magnesia thermal reduction reaction, the reaction temperature is 800°C, and the reaction time is 10 hours; after the reaction is completed, cool to room temper...

Embodiment 2

[0060] A preparation method of nano-silicon-based material, comprising the following steps:

[0061] 1) Mix the commercial crude silicon and sulfur powder evenly at a molar ratio of 1:2.05, seal them in a quartz tube under an argon atmosphere, then place the quartz tube in a tube furnace, and heat up to 1100°C, and keep at this temperature for 10 hours, then cool to room temperature to obtain silicon sulfide;

[0062] 2) Then the silicon sulfide prepared in step 1) is mixed with aluminum powder and sodium chloride through ball milling, the rotating speed is 180r / min, and the ball milling time is 10 hours to obtain the mixture; the mol ratio of aluminum powder to silicon sulfide is 4.0:3, The weight ratio of sodium chloride to silicon sulfide is 6:1.

[0063] 3) Put the mixture described in step 2) in a tube furnace, feed argon gas, and carry out the aluminothermic reduction reaction, the reaction temperature is 750°C, and the reaction time is 15 hours; after the reaction is c...

Embodiment 3

[0070] A preparation method of nano-silicon-based material, comprising the following steps:

[0071] 1) Mix the commercial crude silicon and sulfur powder evenly at a molar ratio of 1:2.05, seal them in a quartz tube under an argon atmosphere, then place the quartz tube in a tube furnace, and heat up to 1100°C, and keep at this temperature for 10 hours, then cool to room temperature to obtain silicon sulfide;

[0072] 2) then the silicon sulfide prepared in step 1) is mixed with magnesium powder and potassium chloride through ball milling, the rotating speed is 180r / min, and the ball milling time is 10 hours to obtain a mixture; the mol ratio of magnesium powder and silicon sulfide is 2.2:3, The weight ratio of potassium chloride to silicon sulfide is 9:1.

[0073] 3) Put the mixture described in step 2) in a tube furnace, feed argon gas, and carry out a magnesia thermal reduction reaction, the reaction temperature is 850°C, and the reaction time is 5 hours; after the reactio...

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Abstract

The invention discloses a nano silicon-based material, and a preparation method and an application thereof. The preparation method comprises the following steps: obtaining silicon sulfide through high-temperature solid-phase reaction of commercial raw silicon and powdered sulfur, obtaining nano silicon through metal thermal reduction reaction of silicon oxide, then, compositing the nano silicon with sulfide solid-state electrolyte through grinding, and obtaining the nano silicon-based material. Compared with the prior art, the nano silicon-based material has the advantages of low energy consumption, short cycle, and so on, and is beneficial for being produced in large scale. Moreover, by preparing a silicon / solid-state electrolyte composite material through coating the nano silicon with amorphous sulfide solid-state electrolyte, volume change of the silicon in a lithiation / lithium removal process can be buffered, silicon particles can be prevented from contacting the electrolyte and consequently be protected from being corroded by the electrolyte, and diffusion of lithium ions from liquid-state electrolyte to the silicon particles cannot be influenced.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a nano-silicon-based material and its preparation method and application. Background technique [0002] Lithium-ion batteries are now widely used in mobile electronic devices, such as smartphones, laptops, etc., and have huge markets in grid energy storage, electric vehicles. However, with the large-scale use of lithium-ion batteries in electric vehicles, traditional graphite-based anodes cannot meet the increasing requirements of high energy density for power batteries. Compared with graphite-based negative electrodes, the theoretical capacity of silicon-based negative electrodes reaches 4200mAh / g, which has important application prospects. [0003] However, in the process of forming the lithium-silicon alloy, the volume expansion is as high as 300%, which seriously affects the cycle life of the material. At present, measures to improve the cycle life of silic...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/58
CPCH01M4/386H01M4/5815Y02E60/10
Inventor 金源郑东刘慧军牛丽媛谢健郭永斌
Owner ZOTYE INT AUTOMOBILE TRADING CO LTD
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