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

Electrochemistry of carbon subfluorides

An electrochemical, low-fluorinated coke technology, applied in the field of bulk, can solve problems such as poor conductivity

Active Publication Date: 2009-03-18
CALIFORNIA INST OF TECH +2
View PDF7 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poly(carbon monofluoride) and poly(carbon monofluoride) are known to have relatively poor electrical conductivity

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
  • Electrochemistry of carbon subfluorides
  • Electrochemistry of carbon subfluorides
  • Electrochemistry of carbon subfluorides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Embodiment 1: the synthesis of subfluorinated graphite

[0113] Graphite (the natural graphite of 7.5 μm of Madagascar (Madagascar) or the artificial graphite of 15-20 μm that the amount M is 10-30 grams is distributed on the nickel plate, 0.2g / cm 2 ) into a nickel reactor (4 L) and dried under vacuum at room temperature for 2 hours. Then, fluorine gas (purity 99.90%) was introduced up to 1 atm, after which fluorine gas was inflowed at a controlled rate (FL g / hour) using an open system reactor. Afterwards, the temperature was increased regularly (1° C. / min) to a final temperature T (° C.) and held for H hours. After the reaction, the reactor was cooled to room temperature. Next, excess fluorine was evacuated for 3 hours under a flow of dry nitrogen. (Note: F / C molar ratio of subfluorinated graphite is measured by gravimetric uptake method.)

[0114] Synthesis of CF0.63

[0115] Graphite mass M=30g

[0116] Fluorine flow rate FL=2g / hour

[0117] Reaction time H=...

Embodiment 2

[0149] Embodiment 2: Characterization of subfluorinated graphite

[0150] figure 1 X-ray diffraction spectra of subfluorinated graphitic materials with a range of F / C ratios are demonstrated. The spectrum exhibits peaks characteristic of a fluorinated graphite matrix between about 10 and 15 degrees 2Θ and between about 40 and 45 degrees. At 2θ = 26.3, it is clearly observed that CF 0.34 、CF 0.48 and CF 0.57 The peak; this place is the characteristic position of (002) graphite peak. The X-ray diffraction (XRD) powder diffraction pattern was obtained using a diffractometer with Cu(K α )radiation( ) and obtained. The spectrum is a plot of intensity (counts) versus 2Θ.

[0151] figure 2 A zoomed-in view of the X-ray diffraction spectrum of a subfluorinated graphite material with an F / C ratio of 0.9 is shown. The spectrum exhibits characteristic peaks at about 13 degrees (002) and about 41 degrees (100) of 2Θ for the fluorinated graphite matrix. The other peaks are loc...

Embodiment 3

[0157] Embodiment 3: the electrochemical characteristic of subfluorinated graphite

[0158] For electrochemical experiments, the positive electrode consists of subfluorinated carbonaceous materials, conductive materials, and binders. The positive electrode was then installed in a two-electrode cell in which the electrolyte consisted of 1 mol.L dissolved in propylene carbonate (PC) and dimethyl ether (DME). -1 LiBF 4 Solution composition. A microporous polyethylene or polypropylene film containing the electrolyte is inserted between the fluorinated graphite electrode and the lithium metal foil.

[0159] Figure 6 A Ragone plot of energy density versus the square root of power density is shown. Low fluorinated graphite CF 0.90 、CF 0.77 and CF 0.744 , compared with CF, when the power density is greater than 625W / kg, it has significantly higher energy density.

[0160] Figure 7-10 Graphite Subfluoride CF 0.9 、CF 0.77 、CF 0.744 and CF 0.647 discharge curve. The elect...

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
Lengthaaaaaaaaaa
Average sizeaaaaaaaaaa
Energy densityaaaaaaaaaa
Login to View More

Abstract

Subfluorinated carbonaceous materials obtained through direct fluorination of graphite or coke particles are provided. One set of subfluorinated carbonaceous materials has an average chemical composition CFx in which 0.63 < x <= 0.95, 0.66 < x <= 0.95 or 0.7 < x <= 0.95. The subfluorinated carbonaceous materials are capable of electrochemical performance superior to commercial CF at relatively high rates of discharge.

Description

[0001] Cross-references to related applications [0002] This application claims priority to US Application 11 / 422,564, filed June 6, 2006, US Application 11 / 675,308, filed February 15, 2007, and International Application PCT / US2007 / 62243, filed February 15, 2007. This application also claims U.S. Provisional Application Nos. 60 / 775,110, filed February 21, 2006, 60 / 775,559, filed February 22, 2006, and U.S. Provisional Application Nos. 60 / 775,559, filed February 9, 2007 to Yazami et al. "Coke Based Subfluorinated Carbon Fluorides (CF x ) Cathodesin Lithium Batteries", the entire content of each application is hereby incorporated by reference to the extent that it does not conflict with the disclosure content of this specification. Background technique [0003] The present invention is in the field of fluorinated carbonaceous materials, particularly subfluorinated graphite and coke particles. [0004] Fluorocarbons are commercially used as cathode materials in lithium primary...

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): H01M6/18H01M4/583H01M10/052H01M10/054
CPCH01M4/583H01M4/5835H01M6/181H01M10/0525C01B32/10C01B32/22Y02E60/10H01M2004/028
Inventor R·亚兹密A·哈姆威
Owner CALIFORNIA INST OF TECH
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