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

A kind of powder pre-lithiated silicon-based negative electrode material and its preparation method and application

A pre-lithiated silicon-based, negative electrode material technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low Coulombic efficiency and reduced electronic conductivity for the first time, so as to improve reversible capacity and electronic conductivity , Make up for the relatively loose and porous effect

Active Publication Date: 2022-02-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a powder pre-lithiated silicon-based negative electrode material and its preparation method and application, to solve the problem that the traditional silicon oxide material has a low initial Coulombic efficiency, and the partially lithiated silicon oxide is partially Lithium silicate and other by-products lead to technical problems such as a further reduction in the intrinsic electronic conductivity of the material

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
  • A kind of powder pre-lithiated silicon-based negative electrode material and its preparation method and application
  • A kind of powder pre-lithiated silicon-based negative electrode material and its preparation method and application
  • A kind of powder pre-lithiated silicon-based negative electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In an anhydrous and oxygen-free environment, take 1.25 L of butyllithium solution with a molar concentration of 0.8 mol / L (solvent is ether), add 2 mol of closed-type o-carborane (closo-1,2-C 2 B 10 h 12 ), reacted at 0°C for 12h, took 8 mol of silicon oxide (352g) with a D50 of 5μm, added to the above solution, soaked for 12h, and dried the above solution in a vacuum oven at 100°C to obtain a lithium-containing carborane cluster coating silicon oxide material. Place the silicon oxide material coated with lithium-containing carborane clusters in a rotary furnace under an argon atmosphere. The rotary furnace speed is 0.25r / min, and the temperature is kept at 400°C for 1h, then the temperature is raised to 1200°C, and the temperature is kept at 2h , cooled to room temperature and discharged to obtain a sintered material. Soak the sintered material in 10% dilute nitric acid solution for 3 hours, wash with deionized water until the solution is neutral, and filter and dry...

Embodiment 2

[0042] In an anhydrous and oxygen-free environment, take 2.4 L of methyllithium solution with a molar concentration of 2.5 mol / L (solvent is ether), add 2 mol of closed m-carborane (closo-1,7-C 2 B 10 h 12 ), reacted at -10°C for 1h, took 2mol of silicon oxide (88g) with a D50 of 7μm, added to the above solution, soaked for 12h, and dried the above solution in a vacuum oven at 80°C to obtain a lithium-containing carborane cluster clathrate coated silicon oxide material. Put the above silicon oxide material coated with lithium-containing carborane clusters in a rotary furnace under an argon atmosphere, the rotary furnace speed is 1r / min, and the temperature is kept at 200°C for 6h, then the temperature is raised to 800°C, and the temperature is kept at 12h , cooled to room temperature and discharged to obtain a sintered material. Soak the above-mentioned sintered material in 20% dilute hydrochloric acid solution for 0.5h, wash with deionized water until the solution is neutr...

Embodiment 3

[0048] In an anhydrous and oxygen-free environment, take 1.2L of butyllithium solution with a molar concentration of 2.5mol / L (the solvent is benzene), add 2mol of closed-type p-carborane (closo-1,12-C 2 B 10 h 12), reacted at 30°C for 4h, took 2 mol of silicon oxide (88g) with a D50 of 6μm, added to the above solution, soaked for 12h, and dried the above solution in a vacuum oven at 80°C to obtain a lithium-containing carborane cluster coating silicon oxide material. Put the above-mentioned dried lithium-containing carborane cluster-coated silicon oxide material in a rotary furnace under an argon atmosphere, the rotary furnace speed is 0.5r / min, the temperature is kept at 300°C for 4h, and then the temperature is raised to 900°C ℃, keep the temperature for 6 hours, cool down to room temperature and discharge to obtain the sintered material. Soak the sintered material in dilute sulfuric acid solution for 0.5h, wash with deionized water until the solution is neutral, and fil...

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 discloses a powder pre-lithiated silicon-based negative electrode material and its preparation method and application. The invention firstly prepares a silicon oxide material coated with a lithium-containing carborane cluster, and then undergoes segmental heating and sintering. , so that the boron element in the lithium-containing carbon-boron cluster compound continuously diffuses into the silicon-based material, replacing part of the silicon atoms, forming a substitutional doping, increasing the vacancy current-carrying concentration, thereby increasing the intrinsic electronic conductivity of the silicon material. At the same time, during the high-temperature sintering process, the incompletely reacted lithium ions in the lithium-containing carborane cluster react with silicon oxide to further form by-products such as lithium metasilicate, lithium silicate, and lithium oxide to achieve pre-lithiation, thereby Improving the first-time Coulombic efficiency of cells made from this material. Furthermore, a uniform and dense carbon layer is formed on the surface of the material by chemical vapor deposition, which can make up for the relatively loose and porous carbon layer formed by the carbonization of carborane clusters, thereby further improving the cycle stability of the material.

Description

technical field [0001] The invention relates to a lithium-ion battery material, in particular to a powder pre-lithiated silicon-based negative electrode material and a preparation method and application thereof. Background technique [0002] With the development of electric vehicles and portable appliances, the demand for lithium-ion batteries with high energy density is also increasing. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is difficult to meet market demand. The first gram capacity of silicon materials is 4200mAh / g, the lithium intercalation platform is higher, the earth's crust is abundant, and it is environmentally friendly, which has gradually attracted widespread attention of researchers. [0003] However, the volume expansion of silicon is as high as 300%. During the cycle, it will not only cause silicon to separate from the surrounding conductive carbon network to form "dead silicon", but also cause silicon...

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): H01M4/36H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/628H01M4/624H01M4/625H01M4/483H01M4/5825H01M10/0525H01M2004/027Y02E60/10
Inventor 王辉王庆莉林少雄许家齐周勇岐丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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