Method for synthesizing Fe3O4/C lithium ion battery cathode material with hollow sphere structure by one-step process

A negative electrode material and lithium storage technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of few reports, and achieve the effect of simple process, uniform appearance and high crystallinity

Inactive Publication Date: 2011-10-05
GUANGZHOU HKUST FOK YING TUNG RES INST
View PDF5 Cites 45 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above facts and the current application of Fe 3 o 4 There are not many relevant reports about the material being used as a lithium ion negative electrode material. This patent discloses a synthetic submicron-scale hollow spherical Fe 3 o 4 Novel preparation method of / C composite material and its application in lithium-ion batteries

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
  • Method for synthesizing Fe3O4/C lithium ion battery cathode material with hollow sphere structure by one-step process
  • Method for synthesizing Fe3O4/C lithium ion battery cathode material with hollow sphere structure by one-step process
  • Method for synthesizing Fe3O4/C lithium ion battery cathode material with hollow sphere structure by one-step process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1.35g of ferric chloride hexahydrate, dissolve it in 35 mL of ethylene glycol solution, and then add 1-2 mL of polyethylene glycol 2000 dropwise to 30 o C. Slowly add 2.73g urea and 1.0g glucose (the molar ratio of ferric chloride:urea is 1:9) under magnetic stirring at room temperature, and keep stirring at this temperature for 1 hour. Transfer this mixed solution to a 50 mL polytetrafluoroethylene lined reactor, o React at C for 48 hours. After the reactor is cooled to room temperature, the supernatant is recovered for the next use, the obtained precipitate is separated by filtration and washed with deionized water and absolute ethanol 3 times each, 80 o Vacuum drying at C for 12 hours to obtain a black product. The obtained products were subjected to elemental analysis and XRD analysis, indicating that the product is Fe 3 O 4 / C.

[0033] With ferric chloride: urea molar ratio of 1:9, solvothermal 200 o Hollow sphere structure Fe prepared by C reaction for 48 hour...

Embodiment 2

[0035] Weigh 1.35g of ferric chloride hexahydrate, dissolve it in 35mL of ethylene glycol solution, and then add 1-2mL of polyethylene glycol 2000 dropwise. o Under C water bath heating and magnetic stirring, slowly add 2.73g urea and 1.0g glucose (wherein the molar ratio of ferric chloride:urea is 1:9), maintain this temperature and continue to stir for 1 hour. Transfer this mixed solution to a 50mL polytetrafluoroethylene-lined reactor, at 200 o React at C for 24 hours. After the reaction kettle is cooled to room temperature, the supernatant liquid is recovered for the next use, the obtained precipitate is separated by filtration and washed with deionized water and absolute ethanol 3 times each, 80 o Vacuum drying at C for 12 hours to obtain a black product. The obtained products were subjected to elemental analysis and XRD analysis, indicating that the product is Fe 3 O 4 / C.

[0036] Hollow sphere structure Fe prepared by ferric chloride: urea molar ratio of 1:9, solvothermal...

Embodiment 3

[0038] Weigh 2.70g of ferric chloride hexahydrate and dissolve it in 35mL of ethylene glycol solution, then add 1-2mL of polyethylene glycol 2000 dropwise, and slowly add 6.67g of urea and 1.0g in a water bath at 40°C under magnetic stirring Glucose (wherein the molar ratio of ferric chloride:urea is 1:11), keep this temperature and continue to stir for 1 hour. Transfer this mixed solution to a 50mL polytetrafluoroethylene-lined reactor, at 200 o React at C for 48 hours. After the reaction kettle is cooled to room temperature, the supernatant is recovered for the next use. The precipitate obtained is filtered and separated and washed with deionized water and absolute ethanol 3 times each, 80 o Vacuum drying at C for 12 hours to obtain a black product. The obtained products were subjected to elemental analysis and XRD analysis, indicating that the product is Fe 3 O 4 / C.

[0039] The molar ratio of ferric chloride: urea is 1:11, solvothermal is 200 o Hollow sphere structure Fe pr...

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
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a lithium-stored composite material Fe3O4 / C with a hollow sphere structure and an application of the lithium-stored composite material Fe3O4 / C with a hollow sphere structure in a lithium ion battery, belonging to the technical fields of material synthesis and high-energy lithium-ion storage batteries. The preparation method is characterized in that a solvothermal method or hydrothermal method is utilized to prepare the Fe3O4 / C composite material with a hollow sphere and narrower particle size distribution, wherein the Fe3O4 / C composite material is high in purity; and the mean particle size of the Fe3O4 / C composite material is 750 nanometers and the wall thickness of the Fe3O4 / C composite material is 250 nanometers. An electrochemical test proves that the first discharging specific capacity of the Fe3O4 / C composite material prepared by the method can be 1157mAh / g, and the discharging specific capacity of the Fe3O4 / C composite material can be 900mAh / g after being circulated for 65 times, thus showing the perfect cyclical stability. The Fe3O4 / C composite material has good rate performance; and the charging specific capacity of the Fe3O4 / C composite material is 620mAh / g and 460mAh / g respectively under 2C and 5C charge-discharge rates, thus the rate performance is superior to that of an existing commonly-used carbon cathode material (theoretical specific capacity is 372mAh / g). The Fe3O4 / C lithium ion battery cathode material is low in cost, simple in process and easy to industrialize, and has wide application prospects in the high-energy lithium ion battery field.

Description

Technical field [0001] The present invention relates to negative electrode material technology for lithium ion secondary batteries, in particular to Fe-based iron-based composite oxide negative electrode material with hollow sphere structure 3 O 4 / C and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high potential, large specific energy, long cycle life, stable discharge performance, good safety, wide operating temperature range, and environmental protection. They are widely used in portable electronic equipment, power tools, space technology, and defense industries. field. Nowadays, the widely used negative electrode material is graphitized carbon material, which has excellent performance in multiple charge and discharge cycles, but its lithium storage capacity is lower than the theoretical specific capacity of graphite of 372mAh / g, which is difficult to meet the needs of a new generation of large-capacity lithium-ion batterie...

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): H01M4/52H01M4/1391H01M4/62
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 邓远富施志聪张秋美陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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