Evaluation of cathode materials for the lithium/ carbonmonofluoride battery

Morita, Akiyoshi; Iijima, Takashi; Fujii, Takabumi; Ogawa, Hiromichi

doi:10.1016/0378-7753(80)80100-5

Cited by 28 publications

(5 citation statements)

References 2 publications

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“…22 The observed voltage could be an indirect confirmation for the presence of the fluorine compounds since the OCP voltage fits very well with the OCP voltage of Li (C−F) n batteries. 49,50 The presence of "free" fluorine is additionally confirmed by the presence of a plateau at 3.1 V during the first discharge. The length of the plateau is correlated with a degree of fluorination (Figure S1); however, according to the quantity of fluorine in the interlayer, only a minor part of fluorine electrochemically reacts with lithium.…”

Section: Chemistry Of Materialsmentioning

confidence: 90%

Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

et al. 2015

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We report on the synthesis of fluorinated reduced graphene oxide (F-rGO) by a direct fluorination of reduced graphene oxide (rGO) with F 2 or XeF 2 /BF 3 in anhydrous HF.Characterization performed by HAADF-STEM and NMR confirmed the formation of C-F bonds, which is also supported by the color change from graphite grey to light yellow. F-rGO has been used as an interlayer additive supported by a glass fiber separator in lithium-sulfur (Li-S) batteries in order to block the diffusion/migration of polysulfides from the porous positive electrode to the metallic lithium electrode and to prevent the redox shuttle effect.Electrochemical cycling of Li-S batteries has confirmed the beneficial role of F-rGO separators, with a more pronounced effect observed for high degrees of fluorination. X-ray photoelectron spectroscopy (XPS) studies have shown a direct effect on the amount of Li 2 S and polysulfides found on the lithium electrode, and evidenced a better reversibility of reduction/oxidation mechanisms of sulfur at the positive electrode upon discharge/charge.

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Section: Chemistry Of Materialsmentioning

confidence: 90%

Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

et al. 2015

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“…Several kinds of carbon starting materials have been used, and their performance characteristics have been investigated. 3 After C 60 was discovered and fluorinated, its electrochemical properties as a cathode material were also reported. 4 Some authors have reported the behavior of fluorinated carbon nanotubes in an electrochemical cell where the carbon nanotubes were made by decomposition of acetylene over silica-supported cobalt catalysts and fluorinated by F 2 /HF/IF 2 at room temperature or 500 °C.…”

Section: Introductionmentioning

confidence: 99%

Fluorotubes as Cathodes in Lithium Electrochemical Cells

Peng

Yang

et al. 2001

Nano Lett.

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Fluorotubes (C 2 F) were prepared by fluorinating SWNTs with F 2 /HF at 250 °C for 12 h and were consequently used as cathode material in a lithium electrochemical cell. The Raman and FTIR spectra of the fluorotubes were investigated before and after the cell was discharged. The discharging performance of the fluorotube/lithium electrochemical cell was studied and compared with that of a carbon monofluoride (CF x )/ lithium cell. Thermodynamic calculations using the ∆H f °of fluorotubes and carbon monofluoride indicated that the potential of a fluorotube/ lithium electrochemical cell, where the fluorotubes were made by the fluorination of armchair (10,10) SWNTs, should be 0.4 V higher than that of a carbon monofluoride/lithium cell. The experimental results support the theoretical calculations. The relation between SWNT diameter and cell potential was also investigated.

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“…For Li||CF x batteries, the mixture of PC and DME has been widely employed to formulate Li + ‐ion conductive electrolytes, [9a, 13c,d, 22] due to the fact that PC has inherently a high dielectric constant ( ϵ =65.0 (PC) vs. 7.2 (DME)), [17, 23] and DME owns lower viscosity ( η =2.5 (PC) vs. 0.4 cP (DME)) [17, 23, 24] . The binary mixture regulates the dielectric constant and viscosity of the electrolytes, thus balancing the dissociation and transportation of salt in the solvent [11a, 16h, 25] . Effectively, for the equal‐weight mixture of PC/DME under study, it shows a relatively high dielectric constant of 31.6 (25 °C) and low viscosity of 0.99 cP (25 °C) (Table S1), which are very close to that of the commonly used solvent mixture of EC/EMC (33.6; 1 : 1, by wt; 25 °C [27] ) for LIBs [28] .…”

Section: Resultsmentioning

confidence: 99%

Anion Donicity of Liquid Electrolytes for Lithium Carbon Fluoride Batteries

Wang

Song

et al. 2022

Angewandte Chemie

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The increasing demand for high-energy powers have greatly incentivized the development of lithium carbon fluoride (Li j j CF x ) cells. Five kinds of non-aqueous liquid electrolytes with various kinds of lithium salts (LiX, X = PF 6 À , TFSI À , BF 4 À , ClO 4 À , and CF 3 SO 3 À ) were comparatively studied. Intriguingly, the LiBF 4 -based electrolyte show relatively moderate ionic conductivities; yet, the corresponding Li j j CF x cells deliver the highest discharge capacities among them. A combination of morphological and compositional analyses of the discharge CF x cathode suggest that the moderate donicity of BF 4 À anion is accountable for favoring the breakdown of CÀ F bonds, and subsequently forming crystalline lithium fluoride as the main discharge products. This work brings not only fresh understanding on the role of salt anions for Li j j CF x cells, but also inspire the electrolyte design for other conversiontype (sulfur and/or organosulfur) cathode materials desired for high-energy applications.

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Evaluation of cathode materials for the lithium/ carbonmonofluoride battery

Cited by 28 publications

References 2 publications

Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

Fluorotubes as Cathodes in Lithium Electrochemical Cells

Anion Donicity of Liquid Electrolytes for Lithium Carbon Fluoride Batteries

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