7647-19-0Relevant articles and documents
Thermal reactions of lithiated graphite anode in LiPF6-based electrolyte
Choi, Nam-Soon,Profatilova, Irina A.,Kim, Sung-Soo,Song, Eui-Hwan
, p. 10 - 14 (2008)
The thermal reactions of a lithiated graphite anode with and without 1.3 M lithium hexafluorophosphate (LiPF6) in a solvent mixture of ethylene carbonate (EC) and ethylmethyl carbonate (EMC) were investigated by means of differential scanning calorimetry (DSC). The products of the thermal decomposition occurring on the lithiated graphite anode were characterized by Fourier transform infrared (FT-IR) analysis. The lithiated graphite anode showed two broad exothermic peaks at 270 and 325 °C, respectively, in the absence of electrolyte. It was demonstrated that the first peak could be assigned to the thermal reactions of PF5 with various linear alkyl carbonates in the solid electrolyte interphase (SEI) and that the second peak was closely related to the thermal decomposition of the polyvinylidene fluoride (PVdF) binder. In the presence of electrolyte, the lithiated graphite anode showed the onset of an additional exothermic peak at 90 °C associated with the thermal decomposition reactions of the SEI layer with the organic solvents.
Gantar, D.,Rahten, A.,Volavsek, B.
, p. 49 - 58 (1989)
Synthesis and structural investigation of the compounds containing HF2- anions: Ca(HF2)2, Ba4F4(HF2)(PF6)3 and Pb2F2(HF2)(PF6)
Bunic, Tina,Tramsek, Melita,Goreshnik, Evgeny,Zemva, Boris
, p. 2318 - 2324 (2008)
Three new compounds Ca(HF2)2, Ba4F4(HF2)(PF6)3 and Pb2F2(HF2)(PF6) were obtained in the system metal(II) fluoride and anhydrous HF (aHF) acidified with excessive PF5. The obtained polymeric solids are slightly soluble in aHF and they crystallize out of their aHF solutions. Ca(HF2)2 was prepared by simply dissolving CaF2 in a neutral aHF. It represents the second known compound with homoleptic HF environment of the central atom besides Ba(H3F4)2. The compounds Ba4F4(HF2)(PF6)3 and Pb2F2(HF2)(PF6) represent two additional examples of the formation of a polymeric zigzag ladder or ribbon composed of metal cation and fluoride anion (MF+)n besides PbF(AsF6), the first isolated compound with such zigzag ladder. The obtained new compounds were characterized by X-ray single crystal diffraction method and partly by Raman spectroscopy. Ba4F4(HF2)(PF6)3 crystallizes in a triclinic space group P1 with a=4.5870(2) A, b=8.8327(3) A, c=11.2489(3) A, α=67.758(9)°, β=84.722(12), γ=78.283(12)°, V=413.00(3) A3 at 200 K, Z=1 and R=0.0588. Pb2F2(HF2)(PF6) at 200 K: space group P1, a=4.5722(19) A, b=4.763(2) A, c=8.818(4) A, α=86.967(10)°, β=76.774(10)°, γ=83.230(12)°, V=185.55(14) A3, Z=1 and R=0.0937. Pb2F2(HF2)(PF6) at 293 K: space group P1, a=4.586(2) A, b=4.781(3) A, c=8.831(5) A, α=87.106(13)°, β=76.830(13)°, γ=83.531(11)°, V=187.27(18) A3, Z=1 and R=0.072. Ca(HF2)2 crystallizes in an orthorhombic Fddd space group with a=5.5709(6) A, b=10.1111(9) A, c=10.5945(10) A, V=596.77(10) A3 at 200 K, Z=8 and R=0.028.
Chloro-free synthesis of LiPF6 using the fluorine-oxygen exchange technique
Cai, Yuanli,Cao, Bin,Cao, Yitao,Hu, Zhenghao,Liu, Jian,Luo, Chengzhi,Lv, Fulu,Pang, Huan,Xiao, Chaoqun,Yu, Lei,Zhang, Hu
supporting information, (2022/01/23)
A hydrogen fluoride-free and chloro?free method for synthesizing LiPF6 was developed. Employing CaF2 as the direct fluorinating reagent instead of hydrogen fluoride made it much safer and more environment-friendly than conventional methods and reduced the metal residues in product owing to the relatively low-acid reaction conditions less corrosive to equipments. The use of P2O5 as phosphorus source instead of traditionally employed PCl5 significantly reduced the chloro residue in product. Ca(H2PO4)2, the only by-product of the process, could be easily converted into Ca3(PO4)2, a best-selling chemical. The above advantages not only reduce the production costs by ca. 20%, but also significantly improve the product purity. The fluorine-oxygen exchange reaction is a completely new technique for LiPF6 production and may bring about technological revolution in the related industry.
[Li(XeF2)n](AF6) (A = P, As, Ru, Ir), the first xenon(II) compounds of lithium. Synthesis, Raman spectrum, and crystal structure of [Li(XeF2)3](AsF6)
Tavcar, Gasper,Zemva, Boris
, p. 4319 - 4323 (2013/05/22)
The reactions between compounds of the type MAF6 (M = alkali metal; A = P, As, V, Ru, Ir, Sb, Nb, Ta) and xenon difluoride were studied in anhydrous hydrogen fluoride solvent. The coordination products [M(XeF 2)n]AsF6 were only observed in the case of LiAF6 (A = P, As, Ru, Ir), and the crystal structure of [Li(XeF 2)3]AsF6 was determined (monoclinic space group P21 with a = 6.901(9) A, b = 13.19(2) A, c = 6.91(1) A, β = 91.84(2), and Z = 2). The coordination sphere of lithium is comprised of six F atoms. The compound series was also characterized by Raman spectroscopy.
OXYFLUOROPHOSPHATE SYNTHESIS PROCESS AND COMPOUND THEREFROM
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Page/Page column 5, (2010/11/03)
An electrolyte compound has the formula where p is an integer from 1 to 3 inclusive; and Yp+ is a metal ion, onium species, or proton; j is an integer value between 0 and 4 inclusive; k is an integer between 1 and 3 inclusive; and the sum 2k and j equals 6; Z is independently in each occurrence CR1R2 or C(O); R1 and R2 are independently in each occurrence H, F or CH3. A process for preparing an oxyfluorophosphate is also provided.