Lithium tetrafluoroborate is an inorganic compound with the formula LiBF4. It is a white crystalline powder. It has been extensively tested for use in commercial secondary batteries, an application that exploits its high solubility in nonpolar solvents.[2]
Although BF4− has high ionic mobility, solutions of its Li+ salt are less conductive than other less associated salts.[2] As an electrolyte in lithium-ion batteries, LiBF4 offers some advantages relative to the more common LiPF6. It exhibits greater thermal stability[3] and moisture tolerance.[4] For example, LiBF4 can tolerate a moisture content up to 620 ppm at room temperature whereas LiPF6 readily hydrolyzes into toxic POF3 and HF gases, often destroying the battery's electrode materials. Disadvantages of the electrolyte include a relatively low conductivity and difficulties forming a stable solid electrolyte interface with graphite electrodes.
Thermal stability
Because LiBF4 and other alkali-metal salts thermally decompose to evolve boron trifluoride, the salt is commonly used as a convenient source of the chemical at the laboratory scale:[5]
LiBF4 can also be synthesized from LiF and BF3 in an appropriate solvent that is resistant to fluorination by BF3 (e.g. HF, BrF3, or liquified SO2):[5]
^ abXu, Kang. "Nonaqueous Liquid Electrolytes for Lithium-Based Rechargeable Batteries."Chemical Reviews 2004, volume 104, pp. 4303-418. doi:10.1021/cr030203g
^S. Zhang; K. Xu; T. Jow (2003). "Low-temperature performance of Li-ion cells with a LiBF4-based electrolyte". Journal of Solid State Electrochemistry. 7 (3): 147–151. doi:10.1007/s10008-002-0300-9. S2CID 96775286. Retrieved 16 February 2014.
^S. S. Zhang; z K. Xu & T. R. Jow (2002). "Study of LiBF4 as an Electrolyte Salt for a Li-Ion Battery". Journal of the Electrochemical Society. 149 (5): A586–A590. Bibcode:2002JElS..149A.586Z. doi:10.1149/1.1466857. Retrieved 16 February 2014.
^ abcRobert Brotherton; Joseph Weber; Clarence Guibert & John Little (2000). "Boron Compounds". Ullmann's Encyclopedia of Industrial Chemistry. p. 10. doi:10.1002/14356007.a04_309. ISBN3527306730.
^Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry Vol. 1, 2nd Ed. New York: Academic Press. p. 773. ISBN978-0121266011.
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lithium, tetrafluoroborate, inorganic, compound, with, formula, libf4, white, crystalline, powder, been, extensively, tested, commercial, secondary, batteries, application, that, exploits, high, solubility, nonpolar, solvents, namesiupac, name, other, names, b. Lithium tetrafluoroborate is an inorganic compound with the formula LiBF4 It is a white crystalline powder It has been extensively tested for use in commercial secondary batteries an application that exploits its high solubility in nonpolar solvents 2 Lithium tetrafluoroborate NamesIUPAC name Lithium tetrafluoroborateOther names Borate 1 tetrafluoro lithiumIdentifiersCAS Number 14283 07 9 Y3D model JSmol Interactive imageChemSpider 3504162 YECHA InfoCard 100 034 692PubChem CID 4298216UNII AF751CNK2N YCompTox Dashboard EPA DTXSID00884741InChI InChI 1S BF4 Li c2 1 3 4 5 q 1 1 YKey UFXJWFBILHTTET UHFFFAOYSA N YInChI 1 BF4 Li c2 1 3 4 5 q 1 1Key UFXJWFBILHTTET UHFFFAOYALSMILES Li F B F F FPropertiesChemical formula LiBF4Molar mass 93 746 g molAppearance White grey crystalline solidOdor odorlessDensity 0 852 g cm3 solidMelting point 296 5 C 565 7 F 569 6 K Boiling point decomposesSolubility in water Very soluble 1 HazardsOccupational safety and health OHS OSH Main hazards Harmful causes burns hygroscopic NFPA 704 fire diamond 101Safety data sheet SDS External MSDSRelated compoundsOther anions Tetrafluoroborate Related compounds Nitrosyl tetrafluoroborateExcept where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Contents 1 Applications 2 Thermal stability 3 Production 4 ReferencesApplications EditAlthough BF4 has high ionic mobility solutions of its Li salt are less conductive than other less associated salts 2 As an electrolyte in lithium ion batteries LiBF4 offers some advantages relative to the more common LiPF6 It exhibits greater thermal stability 3 and moisture tolerance 4 For example LiBF4 can tolerate a moisture content up to 620 ppm at room temperature whereas LiPF6 readily hydrolyzes into toxic POF3 and HF gases often destroying the battery s electrode materials Disadvantages of the electrolyte include a relatively low conductivity and difficulties forming a stable solid electrolyte interface with graphite electrodes Thermal stability EditBecause LiBF4 and other alkali metal salts thermally decompose to evolve boron trifluoride the salt is commonly used as a convenient source of the chemical at the laboratory scale 5 LiBF4 LiF BF3Production EditLiBF4 is a byproduct in the industrial synthesis of diborane 5 6 8 BF3 6 LiH B2H6 6 LiBF4LiBF4 can also be synthesized from LiF and BF3 in an appropriate solvent that is resistant to fluorination by BF3 e g HF BrF3 or liquified SO2 5 LiF BF3 LiBF4References Edit GFS CHEMICALS Archived 2006 03 16 at the Wayback Machine a b Xu Kang Nonaqueous Liquid Electrolytes for Lithium Based Rechargeable Batteries Chemical Reviews 2004 volume 104 pp 4303 418 doi 10 1021 cr030203g S Zhang K Xu T Jow 2003 Low temperature performance of Li ion cells with a LiBF4 based electrolyte Journal of Solid State Electrochemistry 7 3 147 151 doi 10 1007 s10008 002 0300 9 S2CID 96775286 Retrieved 16 February 2014 S S Zhang z K Xu amp T R Jow 2002 Study of LiBF4 as an Electrolyte Salt for a Li Ion Battery Journal of the Electrochemical Society 149 5 A586 A590 Bibcode 2002JElS 149A 586Z doi 10 1149 1 1466857 Retrieved 16 February 2014 a b c Robert Brotherton Joseph Weber Clarence Guibert amp John Little 2000 Boron Compounds Ullmann s Encyclopedia of Industrial Chemistry p 10 doi 10 1002 14356007 a04 309 ISBN 3527306730 Brauer Georg 1963 Handbook of Preparative Inorganic Chemistry Vol 1 2nd Ed New York Academic Press p 773 ISBN 978 0121266011 This inorganic compound related article is a stub You can help Wikipedia by expanding it vte This electrochemistry related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Lithium tetrafluoroborate amp oldid 1121853445, wikipedia, wiki, book, books, library,
