Preparation method of amorphous silicon powder body, amorphous silicon powder body and lithium ion battery

A technology of amorphous silicon and powder, which is applied in the field of amorphous silicon preparation, can solve the problems of restricting the application of amorphous silicon negative electrode materials, difficulty in mass production, and low utilization rate of raw materials, so as to reduce the phenomenon of powdering and falling off, and is easy to operate , long service life effect

Active Publication Date: 2018-01-12
NORTHERN ALTAIR NANOTECH CO LTD +1
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing preparation methods such as vapor deposition method have high cost, high energy consumption, low utilization rate of raw materials, low yield, and difficulty in mass production, which greatly limits the application of amorphous silicon as the negative electrode material of lithium batteries.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of amorphous silicon powder body, amorphous silicon powder body and lithium ion battery
  • Preparation method of amorphous silicon powder body, amorphous silicon powder body and lithium ion battery
  • Preparation method of amorphous silicon powder body, amorphous silicon powder body and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] In a first aspect, this embodiment provides a method for preparing amorphous silicon powder, comprising the following steps:

[0045] Using metallurgical grade silicon as raw material, the mother ingot is made by smelting;

[0046] Swinging the master ingot by means of single-roll rapid solidification to obtain an amorphous silicon strip;

[0047] subjecting the amorphous silicon strip to embrittlement treatment to obtain an embrittled strip;

[0048] The brittle strip is pulverized to obtain amorphous silicon powder.

[0049] According to statistics, more than 25.7% of silicon is contained on the surface of the earth, and pure silicon crystals rarely exist in nature, and silicon usually exists in silicon dioxide (also known as silica) and silicate. Silicon can generally be divided into the following grades: industrial silicon, metallurgical grade silicon, solar grade silicon and electronic energy grade silicon; among them, solar grade silicon and electronic energy gr...

Embodiment 1

[0106] A preparation method of amorphous silicon powder, comprising the following steps:

[0107] (a) Smelting: using metallurgical grade silicon as raw material, smelting in a non-consumable vacuum electric arc furnace to obtain a master ingot;

[0108] (b) Amorphous strip stripping: use an amorphous strip stripping machine to strip the mother ingot in a single-roller rapid solidification method to obtain an amorphous silicon strip;

[0109] (c) Embrittlement treatment: subjecting the amorphous silicon strip to embrittlement treatment to obtain an embrittlement strip;

[0110] (d) Pulverization treatment: pulverize the embrittled strip to obtain amorphous silicon powder.

Embodiment 2

[0112] A preparation method of amorphous silicon powder, comprising the following steps:

[0113] (a) Melting: Metallurgical grade silicon is used as raw material, and the silicon content in metallurgical grade silicon is 98wt%. Non-consumable vacuum electric arc furnace is used for smelting. First, the non-consumable vacuum electric arc furnace is evacuated. stop pumping at the time, and then charge 0.6atm argon to carry out arc melting, the melting current is 110A, the melting time is 2min, and the number of times of melting is 3 times, and the mother ingot is obtained;

[0114] (b) Amorphous tape stripping: The mother ingot is stripped by using an amorphous strip machine to quickly solidify with a single roller, and the strip furnace in the amorphous strip machine is vacuumed, and it stops when the vacuum reaches 0.01Pa Evacuate, and then fill with 0.3atm argon; the linear speed of the copper roller in the amorphous belt throwing machine is 40m / s, the cooling water with a p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical filed of amorphous silicon preparation and relates to a preparation method of an amorphous silicon powder body, the amorphous silicon powder body and a lithium ion battery. The preparation method of the amorphous silicon powder body comprises the following steps: taking metallurgical grade silicon as a raw material and preparing a master ingot by adopting a smelting manner; performing melt-spinning on the master ingot in a manner of rapid solidification of a single roll to prepare an amorphous silicon strip; performing embitterment treatment on the amorphous silicon strip to obtain an embrittlement strip; and performing crushing treatment on the embrittlement strip to obtain the amorphous silicon powder body. The preparation method of the amorphous silicon powder body, provided by the invention, is simple and efficient in process, environmentally-friendly, lower in cost and easy for industrial production realization. The amorphous silicon powder body can buffer the stress produced by change in silicon volume, reduce the volume expansion effect of an electrode and further improve the cyclic stability of an electrode material.

Description

technical field [0001] The invention belongs to the technical field of amorphous silicon preparation, and in particular relates to a preparation method of amorphous silicon powder, amorphous silicon powder and a lithium ion battery. Background technique [0002] Carbon materials, such as natural graphite, graphitized mesocarbon microspheres, etc., are widely used in lithium-ion battery anode materials. Among non-carbon anode materials, silicon has a very high theoretical specific capacity, a low lithium storage reaction voltage platform, and silicon is widely distributed in nature, and its content in the earth’s crust is second only to oxygen, so silicon-based anode materials It is a new type of high-energy material with great development prospects. However, the challenge faced by silicon-based materials is that the phase transition and volume expansion during the lithiation process will generate large stress, resulting in electrode fracture and pulverization, increased res...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/021B02C19/06B02C19/18H01M4/38H01M10/0525
CPCY02E60/10
Inventor 白岩马书良成信刚董阳阳
Owner NORTHERN ALTAIR NANOTECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap