Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Hollow-structure silicon-carbon negative electrode material and preparation method thereof

A negative electrode material and hollow technology, applied in the field of hollow structure silicon carbon negative electrode material and its preparation, can solve the problems of volume expansion, reduced cycle life, limited application of silicon carbon negative electrode, etc., and achieve the effect of alleviating expansion

Active Publication Date: 2021-11-12
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-carbon anode materials are prone to volume expansion (300%) during charge and discharge, causing the anode to be broken, resulting in reduced cycle life, which limits the application of silicon-carbon anodes.

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
  • Hollow-structure silicon-carbon negative electrode material and preparation method thereof
  • Hollow-structure silicon-carbon negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] 2. A method for preparing a silicon-carbon negative electrode material with a hollow structure, comprising the following steps:

[0031] Step (A): dissolving the silicon core 1 in a metal solution, adding alkali to react, stirring, and centrifuging and washing with water to obtain the first composite particles of the silicon core 1 coated with metal deposits;

[0032] Step (B): Adding the composite particles to organic matter for condensation reaction under acidic conditions, centrifuging and washing with water to obtain the second composite particles with organic ester compound-coated silicon core 1;

[0033] Step (C): heating and calcining the second composite particle under the protection of an inert gas to graphitize the organic ester to form a graphene outer layer 2, and cooling to obtain the third composite particle;

[0034] Step (D): reacting the third composite particles under acidic conditions, removing the metal deposits to form a hollow layer, and obtaining ...

Embodiment 1

[0045] A method for preparing a hollow-structured silicon-carbon negative electrode material, such as figure 2 as shown,

[0046] 1. With SiH 4 Si pellets with a diameter of 20um, i.e. the silicon core 1, were prepared by high-temperature pyrolysis as a silicon source; the obtained Si pellets were dissolved in 15ml, 1mol / L ZnCl 2 solution, then slowly add 5mL concentrated ammonia water to Si and ZnCl 2 In the mixed solution, and constantly stirred, the obtained solution was centrifuged and washed with water to obtain Si / ZnO pellets, which were the first composite particles;

[0047] 3. The obtained Si / ZnO pellets and 2 mL of isopropanol stearate were mixed in H 2SO 4 The solution was reacted in a water bath at 80°C for 1 hour, and the solution was centrifuged and washed with water to obtain Si / ZnO@stearic acid isopropanol pellets, namely the second composite particles;

[0048] 4. The obtained Si / ZnO@stearic acid isopropanol pellets were calcined in a tube furnace for 2 ...

Embodiment 2

[0061] The difference from Example 1 is:

[0062] The diameter of the silicon core 1 is 40um.

[0063] The rest are the same as in Embodiment 1, and will not be repeated here.

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
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a hollow-structure silicon-carbon negative electrode material and a preparation method thereof. The hollow-structure silicon-carbon negative electrode material comprises a silicon inner core and a graphene outer layer coating the outer surface of the silicon inner core, and a hollow layer is arranged between the silicon inner core and the graphene outer layer. The hollow-structure silicon-carbon negative electrode material can provide a space for expansion of a silicon material, and the problem of capacity fading caused by expansion of the silicon-carbon negative electrode material in the charging and discharging process is effectively relieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-carbon negative electrode material with a hollow structure and a preparation method thereof. Background technique [0002] As an efficient, lightweight and portable energy storage device, lithium-ion batteries are widely used in electronic equipment, electrical appliances, electric vehicles and other fields. At present, commercial lithium-ion batteries mostly use graphite (370mAhg) with a lower specific capacity as the negative electrode active material, while silicon (Li 15 Si 4 , 3590mAhg) is very suitable for the preparation of high-performance lithium-ion batteries as the negative electrode material. As electric vehicles pursue higher mileage, more and more battery manufacturers are turning their attention to silicon carbon anodes with higher gram capacity. However, silicon-carbon anode materials are prone to volume expansion (300%) duri...

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): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 王汭
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH 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
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