Negative electrode material, electrochemical device, and electronic apparatus

A negative electrode material, electrochemical technology, applied in the field of electrochemistry, can solve unsatisfactory problems, achieve high mechanical stability, improve electrical conductivity, and low expansion rate

Pending Publication Date: 2021-11-30
NINGDE AMPEREX TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current technology for improving electrochemical devices can improve the cycle performance and rate performance of electrochemical devices to a certain extent, it is not satisfactory, and further improvements are expected

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, electrochemical device, and electronic apparatus
  • Negative electrode material, electrochemical device, and electronic apparatus
  • Negative electrode material, electrochemical device, and electronic apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] In some embodiments of the present application, a method for preparing an electrochemical device is also proposed, including the following steps:

[0040] Negative material preparation:

[0041] Step 1: Add silicon-based powder and carbon nanotube slurry in a certain proportion to MSK-SFM-10 vacuum stirrer and stir for 180 minutes at a revolution speed of 10r / min to 40r / min to obtain slurry.

[0042] Step 2: Transfer the slurry obtained in step 1 to the centrifugal turntable nozzle of the spray drying granulator, and spray dry according to the centrifugal speed of 5000r / min to obtain powder, wherein the inlet temperature of the spray drying granulator is 260°C, and the outlet temperature is 105°C.

[0043] Step 3: The powder obtained in step 2 is sieved, and the sieve is selected from 1000 mesh to 8000 mesh.

[0044] Step 4: Add the sieved powder obtained in step 3 to the ethanol solution, then add the titanium dioxide precursor (such as isopropyl titanate, tetrabutyl...

Embodiment 1

[0057] Li-ion battery preparation:

[0058] Step (1): Add 500g SiOx (0.5<x<1.6) and 500g carbon nanotube (CNT) slurry (1% solid content) into the MSK-SFM-10 vacuum stirrer, stir for 180min, revolution speed 10r / min to 40r / min.

[0059] Step (2): Transfer the slurry in step (1) to the centrifugal turntable nozzle of the spray drying granulator, and the centrifugal speed is 5000r / min to form tiny droplets. The inlet temperature of the spray drying granulator is 260°C, the outlet temperature is 105°C, and the powder is collected by cooling.

[0060] Step (3): The powder in step (2) is sieved, and the sieve is selected from 1000 mesh to 8000 mesh to obtain a powder with a Dv50 of 5.0 μm

[0061] Step (4): Add 500g of the powder sieved in step (3) to 1000mL ethanol solution, then add 30g of isopropyl titanate to it, rotate at 800r / min, stir and disperse for 30min, add 10ml of deionized water and stir After 30 minutes, filter and wash with alcohol solution to obtain powder.

[...

Embodiment 2

[0068] The only difference between embodiment 2 and embodiment 1 is that the mass of CNT in step (1) is 250g, and the rest are the same as embodiment 1.

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
Dv50aaaaaaaaaa
Specific surface areaaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a negative electrode material, an electrochemical device and an electronic apparatus. The negative electrode material provided by the embodiment of the invention comprises a silicon-based material, or the silicon-based material and graphite, wherein the silicon-based material comprises a silicon-oxygen compound, carbon nanotubes and a titanium oxide layer, the carbon nanotubes and the titanium oxide layer are located on the surface of the silicon-oxygen compound, and at least part of the carbon nanotubes penetrate through the titanium oxide layer. According to the negative electrode material provided by the embodiment of the invention, the surface of the silicon-oxygen compound is coated with the TiO2 which is low in expansion rate, high in mechanical stability and good in lithium ion transport property, and meanwhile, the carbon nanotubes are arranged on the surface of the silicon-oxygen compound, so that the conductivity of the negative electrode material is further improved. Through the combination effect between Ti-OH and Si-O, the carbon nanotubes are more stably bound on the surface of the silicon-oxygen compound, the long-range electric conduction effect is continuously achieved in a circulation process, and expansion is reduced while the circulation performance and the rate capability are improved.

Description

technical field [0001] The present application relates to the field of electrochemical technology, in particular to a negative electrode material, an electrochemical device and an electronic device. Background technique [0002] With the development and progress of electrochemical devices (eg, lithium-ion batteries), higher and higher requirements are placed on their cycle performance and rate performance. Although the current technologies for improving electrochemical devices can improve the cycle performance and rate performance of electrochemical devices to a certain extent, they are not satisfactory, and further improvements are expected. Contents of the invention [0003] The embodiment of the present application provides a negative electrode material, including: silicon-based material, or, silicon-based material and graphite; wherein, the silicon-based material includes: silicon oxide, carbon nanotube and titanium oxide layer, carbon nanotube and oxide The titanium ...

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): H01M4/36H01M4/38H01M4/58H01M4/583
CPCH01M4/386H01M4/58H01M4/583H01M4/364Y02E60/10H01M2004/027H01M10/0525H01M4/625H01M2004/021H01M4/366H01M4/134H01M4/483H01M4/587H01M4/485H01M4/133H01M10/0569H01M4/36
Inventor 易婷
Owner NINGDE AMPEREX TECH
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap