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

Negative electrode material, preparation method thereof and lithium ion battery

A negative electrode material and silicon-based material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of increasing irreversible reactions, low capacity retention rate of nanostructured silicon materials, high specific surface area of ​​nano-silicon materials and aggravated interface side reactions, etc. problems, to achieve the effects of reducing irreversible consumption, improving cycle stability, and increasing capacity retention

Pending Publication Date: 2022-06-24
深圳市贝特瑞新能源技术研究院有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Si has the advantages of a theoretical mass specific capacity as high as 4200mAh / g, abundant reserves (26.4%) in the earth's crust, and a suitable working voltage platform. However, the capacity retention rate of nanostructured silicon materials is low, and the high ratio of nanosilicon materials Surface area exacerbates interfacial side reactions, increasing irreversible reactions

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 material, preparation method thereof and lithium ion battery
  • Negative electrode material, preparation method thereof and lithium ion battery
  • Negative electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0122] The present application also provides a method for preparing a negative electrode material, comprising the following steps:

[0123] In step S100, the silicon powder and the metal powder are mixed and then subjected to a first heat treatment until the silicon powder and the metal powder are sublimated and condensed to obtain nano-silicon containing doping elements.

[0124] Step S200 , performing a first coating treatment on the nano-silicon containing doping elements and the first carbon source to obtain a negative electrode material.

[0125] In the above technical solution, the present application obtains nano-silicon containing doping elements by first heat treatment until the sublimation of silicon powder and metal powder, and then condensation treatment, and the metal doping elements can be uniformly distributed in the crystal lattice of the nano-silicon, so that Nano-silicon can maintain a high reversible capacity, and can improve the conductivity of the silicon ma...

Embodiment 1

[0206] This embodiment provides a method for preparing a silicon carbon anode material, and the preparation steps include:

[0207] (1) Mix the elemental silicon powder and germanium powder with a mass ratio of 92:8 in a VC mixer at 120rpm for 10min, place in a vacuum high temperature furnace, evacuate to below 50Pa, heat to 1300°C, keep the temperature for 3 hours, and wait for the powder to evaporate completely After condensing to 300°C, the condensed germanium-doped nano-silicon is collected for use.

[0208] (2) Disperse 2g of dopamine hydrochloride in 2L of deionized water, continue stirring, add 0.02g of sodium hydroxide, then dropwise add tris hydrochloride solution to adjust the pH value to 8.5, then add 5g of 80nm diameter The germanium-doped nano-silicon was dispersed in the above solution, stirred continuously at 25°C for 18h, the obtained solution was centrifuged and washed 3 times with deionized water, kept at 80°C in a vacuum drying oven for 12h, placed in a box ...

Embodiment 2

[0215] (1) Mix elemental silicon powder and germanium powder in a VC mixer at a mass ratio of 90:10 at 150rpm for 8min, place in a vacuum high-temperature furnace, evacuate to below 50Pa, heat up to 1300°C, keep the temperature for 4 hours, and wait until the powder is completely evaporated After condensing to 250°C, the condensed germanium-doped nano-silicon is collected for use.

[0216] (2) Disperse 3.5g of dopamine hydrochloride in 2L of deionized water, continue stirring, add 0.04g of sodium hydroxide, then dropwise add tris hydrochloride solution to adjust the pH value to 8.5, then 7g of diameter is 80nm The silicon powder was dispersed in the above solution, stirred continuously at 25°C for 18h, the obtained solution was centrifuged and washed with deionized water for 3 times, kept at 80°C in a vacuum drying oven for 12h, placed in a box furnace, and kept at 1300°C under an argon atmosphere. 1h, get SiC / Si 3 N 4 Coated nanosilicon.

[0217] (3) Disperse the sample ob...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a negative electrode material, a preparation method thereof and a lithium ion battery, the negative electrode material comprises a silicon-based material in a carbon matrix, the silicon-based material comprises nanometer silicon and doping elements distributed in the nanometer silicon, and in a Raman spectrum of the negative electrode material, the doping elements are distributed in the nanometer silicon. The characteristic peak position of the nanometer silicon and the content of the doping element meet any one of the following relations: 517-2.14 * B < = A < = 523-2.14 * B (1) 487-0.28 * (B-14) < = A < = 493-0.28 * (B-14) (2), in the formula, A is the characteristic peak position of the nanometer silicon in a Raman spectrum of the negative electrode material, the unit is cm <-1 >, and B% is the mass content percentage of the doping element in the nanometer silicon. The characteristic peak position of the nano silicon meets the relationship, which indicates that the doping element can be uniformly doped in the nano silicon, and the crystallization degree of the nano silicon is relatively appropriate, so that the nano silicon can maintain relatively high reversible capacity, the conductivity of the silicon material can be improved, and the cycle stability is favorably improved.

Description

technical field [0001] The present application relates to the technical field of negative electrode materials, and in particular, to a negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of society, the energy and environmental pollution problems caused by the continuous consumption of fossil energy are becoming more and more serious. As a representative of new energy storage and conversion devices, lithium-ion batteries have high energy density, wide operating voltage range, long service life, self- It has the advantages of small discharge, no memory effect and low environmental pollution, and is widely used in consumer electronics, power batteries and energy storage. After decades of development, the capacity of graphite anode has approached its theoretical capacity (372 mAh / g). Therefore, the development of anode materials with high reversible specific capacity and stable electrochemical ...

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
CPCH01M4/366H01M4/386H01M4/625H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 方锐李子坤周豪杰任建国贺雪琴
Owner 深圳市贝特瑞新能源技术研究院有限公司
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