Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-capacity lithium ion battery negative electrode material capable of being industrially produced

A lithium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of unsatisfactory cycle stability, rate performance and safety performance, and achieve high capacity and good cycle performance. Uniformity, avoiding the effect of high energy consumption

Pending Publication Date: 2020-08-21
HUNAN UNIV
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a silicon-carbon composite anode material with simple process route, low cost and suitable for large-scale industrial production, and to solve the cycle stability and rate performance of the silicon-carbon composite material in the prior art and technical application problems with unsatisfactory safety performance

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
  • High-capacity lithium ion battery negative electrode material capable of being industrially produced
  • High-capacity lithium ion battery negative electrode material capable of being industrially produced
  • High-capacity lithium ion battery negative electrode material capable of being industrially produced

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing an industrially produced high-capacity lithium-ion battery negative electrode material, comprising the following steps:

[0047] (1) After washing and drying micron-sized industrial silicon powder with HCl, it is crushed by a crusher, and then classified on a jet mill equipped with an air cyclone to obtain 2-3 µm precursor silicon powder;

[0048] (2) Place the precursor silicon powder in step (1) in a calciner, raise the temperature to 950°C, and feed a mixed gas containing water vapor, oxygen and argon, with a water vapor content of 8% and an oxygen content of 2%. Calcining for 6 hours to prepare a composite powder of silicon oxide and silicon;

[0049] (3) Mix the prepared composite powder of silicon oxide and silicon with the artificial graphite matrix material in a mass ratio of 1:1 through a mechanical fusion machine for 3 hours to obtain a mixture powder;

[0050] (4) Next, put the powder in step (3) and coal-based medium-temperature pitch...

Embodiment 2

[0058] A method for preparing an industrially produced high-capacity lithium-ion battery negative electrode material, comprising the following steps:

[0059] (1) After washing and drying micron-sized industrial silicon powder with HCl, it is crushed by a crusher, and then classified on a jet mill equipped with an air cyclone to obtain 2-3 µm precursor silicon powder;

[0060] (2) Put the silicon powder precursor in a calcination furnace, raise the temperature to 950°C, pass in a mixed gas containing oxygen and nitrogen, the oxygen content is 20%, and calcine for 10 hours to prepare a composite powder of silicon oxide and silicon;

[0061] (3) Mix the prepared composite powder of silicon oxide and silicon with the artificial graphite matrix material in a mass ratio of 1:1 through a mechanical fusion machine for 3 hours to obtain a mixture powder

[0062] (4) Next, put the powder in step (3) and coal-based medium-temperature pitch with a median particle size of 15-30 μm in a VC...

Embodiment 3

[0069] A method for preparing an industrially produced high-capacity lithium-ion battery negative electrode material, comprising the following steps:

[0070] (1) After washing and drying micron-sized industrial silicon powder with HCl, it is crushed by a crusher, and then classified on a jet mill equipped with an air cyclone to obtain 2-3 µm precursor silicon powder;

[0071] (2) Put the silicon powder precursor in a calcination furnace, raise the temperature to 800°C, pass in a mixed gas containing water vapor and argon, with a water vapor content of 15%, and calcine it in an atmosphere containing an oxidizing atmosphere for 10 hours to prepare Obtain the composite powder of silicon oxide and silicon;

[0072] (3) Mix the prepared composite powder of silicon oxide and silicon with the artificial graphite matrix material in a mass ratio of 1:1 through a mechanical fusion machine for 3 hours to obtain a mixture powder;

[0073] (4) Next, put the powder in step (3) and the phe...

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

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
D50aaaaaaaaaa
Login to View More

Abstract

The invention provides a silicon-carbon composite negative electrode material, which is simple in process route, low in cost and suitable for large-scale industrial production. According to the invention, oxidizing is performed in an oxidizing atmosphere to prepare porous silicon particles, secondary embedding is performed, and system calculation and accurate control on oxidation and etching conditions are carried out to prepare a composite material with graphite as a matrix, porous structure silicon nanoparticles as a core body and a conductive carbon layer as a shell layer; and the technicalapplication problems of unsatisfactory cycling stability, rate capability and safety performance of a silicon-carbon composite material in the prior art are solved, and the composite material is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, in particular to a high-capacity lithium-ion battery negative electrode material that can be industrially produced. Background technique [0002] With the rapid development of electric vehicles and advanced electronic equipment, higher requirements are put forward for the energy density of lithium-ion batteries, and the energy density of lithium-ion batteries is increasing at a rate of 7-10% per year. However, at present, the anode materials of commercial lithium-ion batteries are still mainly graphite-based materials, which have a low theoretical specific capacity (only 372 mAh / g) and poor rate performance. In order to meet the energy demand of the new generation, it is imminent to develop new lithium-ion battery anode technology. Alloying reaction occurs between silicon and lithium, which has a high theoretical specific capacity (4200 mAh / g), a low voltage platfo...

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
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 韩飞刘金水项品峰汪卫斌
Owner HUNAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com