Kev Tshawb Fawb Kev Txhim Kho hauv Kev Npaj Tshiab Lithium Salt Lithium Difluoroxalate Borate

Taw qhia

Electrolyte ntsev yog ib feem tseem ceeb ntawm lithium ion roj teeb, thiab nws cov kev tshawb fawb thiab kev loj hlob tseem ceeb heev rau kev ua tau zoo thiab kev loj hlob ntawm lithium ion roj teeb theem nrab.

Tam sim no, lithium ntsev xws li lithium hexafluorophosphate (LiPF6),Lithium tetrafluoroborate (LiBF4),Lithium bis-oxalate borate (Li-BOB), thiabLithium difluorooxalate borate (LiDFOB)yog tsim los mas.

Raws li hom tshiab ntawm lithium ntsev, lithium difluorooxalate borate (LiDFOB). Nws muaj ib nrab ntawm cov qauv ntawm lithium tetrafluoroborate thiab lithium bis-oxalate borate, yog li nws muab cov txiaj ntsig zoo ntawm ob lub lithium ntsev, tsis yog tsuas yog kev ua haujlwm kub ntawm LiBOB, tab sis kuj muaj qhov kub thiab txias ntawm LiBF4, thiab kev siv qhov kub thiab txias. ntau.

Kev npaj CAS 409071-16-5|Lithium Difluoro (oxalato) borate

1) Txheej Txheem Txheej Txheem

Cov tshuaj muaj fluorine, boron, lithium thiab oxalate yog sib xyaw rau hauv ib qho kev faib ua feem, thiab tom qab lub pob milling thiab kev kho cua sov siab, cov khoom yog purified los ntawm cov organic hnyav rau ob peb zaug kom tau lithium difluorooxalate borate khoom.

Lithium oxalate thiab boron trifluoride ether yog ntxiv rau hauv ib lub tshuab ziab khaub ncaws qhuav hauv qhov sib piv ntawm 1: 1 txog 1: 3, thiab pob-milled ntawm 30-90 degree C rau 2-24 h; Tom qab ntawd cov khoom siv pob-milled cov tshuaj tiv thaiv yog yaj nyob rau hauv cov kuab tshuaj organic ntawm 30-90 degree, cov khoom theem los ntawm cov khoom lag luam thiab cov khoom tsis zoo lithium oxalate raug tshem tawm los ntawm kev pom kom tau txais cov tshuaj uas muaj LiODFB. Tom qab ntawd crystallize ntawm qhov kub qis ntawm -20-10 degree kom tau LiODFB crystals, thiab nqus tsev vacuum ntawm 40-100 degree rau 10-48 h kom tau LiODFB cov khoom ntshiab.

2) Cov txheej txheem dej theem

Nyob rau hauv lub hydrofluoric acid tov system, lub lithium-muaj compound, cov boron-muaj compound thiab oxalate-muaj compound yog ntxiv rau ib-kauj ruam cov tshuaj tiv thaiv kom tau ib tug crude khoom aqueous tov, thiab ces ib tug organic hnyav ntxiv, concentrated thiab purified. kom tau txais cov khoom lag luam lithium difluorooxalate borate.

Cov concentration ntawm 20 feem pua ​​​​ hydrofluoric acid, lithium oxalate, thiab diboron trioxide tau nplawm tag nrho ntawm 20 txog 80 degree rau 2 mus rau 24 teev hauv qhov chaw kaw, thiab tom qab ntawd lim kom tshem tawm cov khoom los ntawm lithium fluoride, thiab concentrated los ntawm evaporation hauv qab txo. siab.

Ib qho kev daws teeb meem ntawm lithium difluorooxalate borate tau txais; cov tshuaj organic uas muaj thionyl chloride yog maj mam ntxiv, thiab cov khoom ntawm lithium difluorooxalate borate tau txais los ntawm kev pom tom qab purification.

3) Organic solvent method (lithium tetrafluoroborate method)

Siv lithium tetrafluoroborate, oxalic acid, ethyl acetate thiab auxiliary anhydrous aluminium chloride ua raw cov ntaub ntawv, cov tshuaj tiv thaiv kub yog 10 degree, cov tshuaj tiv thaiv lub sij hawm yog 4 h, qhov ratio ntawm reactants yog 1: 1, lub crystallization kub yog -20 degree, Lub sij hawm crystallization yog 4 h, purity ntawm LiODFB npaj tuaj yeem ncav cuag 99.97 feem pua, thiab cov txiaj ntsig tuaj yeem ncav cuag 95.9 feem pua.