Discharge Characteristics of Poly(Carbon Monofluoride) Prepared from the Residual Carbon Obtained by Thermal Decomposition of Poly(Dicarbon Monofluoride) and Graphite Oxide
The discharge performances have been investigated of poly(carbonmonofluorides), , prepared from the residual carbons obtained by the thermal decomposition of poly(dicarbon monofluoride), and graphite oxide. The residual carbons were composed of such crystallites having a smaller size along c‐axis than the dimension of ab‐axis. They were easily fluorinated, giving at a relatively low temperature in
研究了由聚一氟化碳热分解所得残余碳和氧化石墨制备的聚一氟化碳的放电性能。残余碳由沿 c 轴尺寸小于 a 轴尺寸的微晶组成。它们很容易氟化,在较短的时间内在相对较低的温度下产生。用本方法制备的石墨氟化物比在非水锂电池中直接氟化制备的石墨具有更高的放电电位。在 0.5 mAcm-2 的电流密度下实现的能量密度最大增加约为 30%。氟的利用率几乎是100%,放电电位的平坦度也很好。
On the Relation Between the Overpotentials and Structures of Graphite Fluoride Electrode in Nonaqueous Lithium Cell
作者:N. Watanabe、R. Hagiwara、T. Nakajima
DOI:10.1149/1.2116004
日期:1984.9.1
of the relationbetween the cathode overpotentials and structures of two kinds of graphitefluorides, (CF)/SUB n/ and (C/sub 2/F)/SUB n/ in nonaqueouslithium battery. The overpotential of (CF)/SUB n/ electrode decreased with increasing interlayer spacing and decreasing thickness of the crystallite along the C axis. However, it was found that the overpotential of (C/sub 2/F)/SUB n/ electrode primarily
Nuclear magnetic resonance study of fluorine-graphite intercalation compounds
作者:A M Panich、T Nakajima、H-M Vieth、A F Privalov、S D Goren
DOI:10.1088/0953-8984/10/34/016
日期:1998.8.31
electric conductivity, covalent C-F bonds start to occur. The number of these bonds grows with fluorine content resulting in a decrease in conductivity which is caused by a percolation mechanism rather than by a change in bondlength. A difference in chemical shift for fluorine-intercalated graphite and covalent graphite fluoride has been observed and is attributed to different C-F bonding in these compounds
The radiativelifetimes of the ν′ = 0 and 1 levels of CF(A 1Σ+) in the gas phase have been measured by observing the fluorescence decay following pulsed laser excitation. The values, 26.7±1.8 and 25.6±1.8 ns respectively, are some 30% larger than those previously observed.
Thermodynamic properties of CF and CF2 from molecular flow effusion and mass spectrometer investigations
作者:Milton Farber、Margaret A. Frisch、Hon Chung Ko
DOI:10.1039/tf9696503202
日期:——
The reaction of CF4 and C has been studied in the temperature range 1800–2500 K. Equilibrium data were obtained for species obtained in this temperature range by two techniques: (i) molecular flow effusion and (ii) effusion-mass spectrometry. Heats of formation were calculated from the reaction thermodynamics for the species CF(g), ΔH°f298 K= 58 ± 1 kcal/mol, and CF2(g), ΔH°f298 K=–41.7 ± 0.4 kcal/mol (third law). The S°298 of CF2(g) is 58.9 ± 1.2 cal/deg. mol (second law). Calculations provided thermodynamic limits for the species CF3(g) and C2F2(g).