On the existence of low- and high-temperature crystal forms of lithium polyphosphate

Benkhoucha, R.; Wunderlich, Bernhard

doi:10.1107/s0567740879003277

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Crystallization, polymorphism and polymerization of LDP, in an open atmosphere of nitrogen saturated with water, were carefully studied by Benkhoucha and Wunderlic [66][67][68][69]. When LDP was heated in open air it melted at ca.…”

Section: Melting Point Of Ldpmentioning

confidence: 99%

Vapor pressure and specific electrical conductivity in the H2O–LiH2PO4–LiPO3 system—a novel electrolyte for water electrolysis at elevated temperature

Berg

Nikiforov

Bjerrum

2021

Ionics

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Lithium dihydrogen phosphate, LiH2PO4 (LDP) was studied for water electrolysis at elevated temperatures. It is shown that pure LDP, melting at ~224 °C and with correct DSC and X-ray diffraction diagram, in presence of sufficient humidity is stable up to 360 °C. Both solid and liquid LDP is structurally disordered and super-protonic conducting with conductivities reaching 0.48 S * cm -1 , when determined in sealed conductivity cells. The vapor pressure above LDP, pure and mixed with LiPO3 or H2O, was determined by means of Raman spectroscopy based on N2 as internal reference gas. Pressures up to ~20 bar at 350 °C were found and conductivities are given for solid and liquid states. Water splitting by electrolysis, 2H2O  2H2 + O2, was demonstrated by Raman spectroscopy at ~225°C and ~4.2 bar with Pt/W electrodes, thus showing that molten LDP has a significant potential for elevated temperature water electrolysis with high efficiency.

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Section: Melting Point Of Ldpmentioning

confidence: 99%

Vapor pressure and specific electrical conductivity in the H2O–LiH2PO4–LiPO3 system—a novel electrolyte for water electrolysis at elevated temperature

Berg

Nikiforov

Bjerrum

2021

Ionics

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Dr. Bernhard Wunderlich: An innovative educator pioneer in the physical chemistry of polymers

Bodily

Davidson

Jaffe

et al. 1992

Polymer Engineering & Sci

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Melting and crystallization of a polyphosphate

Benkhoucha

Wunderlich

1979

J. Polym. Sci. Polym. Phys. Ed.

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Lithium polyphosphate crystals produced by crystallization during polymerization and crystallization from the polymer melt were analyzed by thermal analysis. The glass‐transition and melting temperature, heat of fusion, and entropy of fusion were found to be 336°C, 651.5°C, 21 kJ/mole, and 23 J/deg mole, respectively. Crystallization from the macromolecular melt was followed by thermal analysis, x‐ray diffraction, and electron and optical microscopy. It could be shown that chain folding may be the first step to crystallization from the macromolecular melt. Oligomers could not effectively nucleate crystallization. Lithium polyphosphate is shown to present a prime example of the processes involved in crystallization during polymerization and macromolecular melt crystallization.

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On the existence of low- and high-temperature crystal forms of lithium polyphosphate

Cited by 3 publications

References 9 publications

Vapor pressure and specific electrical conductivity in the H2O–LiH2PO4–LiPO3 system—a novel electrolyte for water electrolysis at elevated temperature

Vapor pressure and specific electrical conductivity in the H2O–LiH2PO4–LiPO3 system—a novel electrolyte for water electrolysis at elevated temperature

Dr. Bernhard Wunderlich: An innovative educator pioneer in the physical chemistry of polymers

Melting and crystallization of a polyphosphate

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