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

Negative electrode active material for secondary battery and preparation method thereof

A negative electrode active material, secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of difficulty in practical application, life deterioration, etc., to suppress cracks and/or cracks, improve life and The effect of capacity

Active Publication Date: 2022-06-21
NEXANS
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for silicon, the volume of charging is about 4 times larger than that of discharging. Therefore, during the charging and discharging process, due to the change in volume, the electrical connection between the active materials is destroyed or the active material is released from the current collector. detachment, Li due to erosion of the active material by the electrolyte 2 The progress of irreversible reactions such as the formation of solid electrolyte interface (Solid Electrolyte Interface, SEI) layers such as O and the resulting degradation of life make it difficult to realize its practical application

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
  • Negative electrode active material for secondary battery and preparation method thereof
  • Negative electrode active material for secondary battery and preparation method thereof
  • Negative electrode active material for secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0052] Hereinafter, the present invention will be described in more detail by way of specific examples, but the present invention is not limited to these examples.

Embodiment

[0054] A dispersion mixture was prepared by dispersing 2 kg of conventional polycrystalline silicon powder having an average diameter of about 5 μm in 10 kg of an oxidizing agent solvent of 100% ethanol. The silicon-based primary particles of Examples and Comparative Examples were prepared by performing a bead milling and pulverizing step in which stress can be controlled under the conditions in Table 1 below. Table 2 below shows the sphericity and particle size distribution of the prepared particles. The silicon purity of the analyzed silicon-based primary particles was 99% or more. The above-mentioned preparation method is an example, and the above-mentioned silicon particles may be prepared by other grinding processes or by blasting the bulk silicon material (eg, silicon wire and silicon wafer).

[0055] Table 1

[0056]

[0057] Table 2

[0058]

[0059] Referring to Table 1 and Table 2, it can be seen that, as in Examples 1 to 3, when the silicon powder is wet pul...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a negative electrode active material for a secondary battery and a preparation method thereof. The negative electrode active material of the present invention includes silicon-based primary particles, and the particle size distribution of the above-mentioned silicon-based primary particles is D10≧50nm and D90≦150nm. The above-mentioned negative electrode active material suppresses or reduces the tensile hoop stress generated in the lithiated silicon particles when the battery is charged, and suppresses irreversible reactions caused by cracks and / or cracks caused by the volume expansion of the above-mentioned silicon particles, thereby improving Battery life and capacity.

Description

technical field [0001] The present invention relates to secondary battery technology, and more particularly, to a negative electrode active material for secondary battery and a preparation method thereof. Background technique [0002] A typical secondary battery is a lithium secondary battery that is generally used as a battery that can be charged and discharged using an electrode material having excellent reversibility. The above-mentioned lithium secondary battery is not only used as a small power source for small IT equipment such as smartphones, portable computers, electronic paper, etc., but is also expected to be applied to mobile tools such as automobiles or power storage in power supply grids such as smart grids. Medium and large power supplies used in the office. [0003] In the case of using lithium metal as the negative electrode material of a lithium secondary battery, there is a risk of short circuit or explosion of the battery due to the formation of dendrites...

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 Patents(China)
IPC IPC(8): H01M4/38H01M4/36C01B33/021
CPCC01B33/021H01M4/386H01M4/483H01M4/04Y02E60/10H01M4/366Y02P70/50H01M4/134H01M4/1395H01M10/052H01M2004/021H01M2004/028
Inventor 朴承哲宋义俊赵永泰朴智惠
Owner NEXANS
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