Methoxyethoxyethoxyphosphazenes as ionic conductive fire retardant additives for lithium battery systems

Fei, Shih To; Allcock, Harry R.

doi:10.1016/j.jpowsour.2009.09.043

Cited by 76 publications

(87 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organophosphorus compounds, such as phosphate, [1][2][3][4][5] phosphonate, 6,7 and phosphazene, 8,9 are widely known as excellent flame retardants. These organophosphorus compounds are used either as co-solvents or additives in the conventional alkyl-carbonate-based electrolyte solution used in lithium-ion batteries.…”

mentioning

confidence: 99%

Effect of Lewis Acids on Graphite-Electrode Properties in EC-Based Electrolyte Solutions with Organophosphorus Compounds

Tsubouchi

Suzuki

Nishimura

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

Compatibility of self-extinguishing property and electrochemical stability of electrolyte solutions containing organophosphorus compounds as flame retardants has been required for practical application of electrolyte solutions to lithium-ion batteries. By adding a Lewis acid, Ca 2+ , Mg 2+ , or Na + , to ethylene carbonate (EC)-based electrolyte solutions containing 50 vol.% trimethylphosphate or dimethyl methylphosphonate, the electrolyte solutions are able to suppress the co-intercalation of the organophosphorus compounds with Li + into graphite. However, the coulombic efficiency in the first charge-discharge in a graphite/Li metal half-cell with an electrolyte solution depends on the species of the added Lewis acid and organophosphorus compound. The difference between the chemical-shift changes of the oxygen of the C=O bond in EC and the oxygen of the P=O bond in organophosphorus compounds in the oxygen-17 nuclear magnetic resonance ( 17 O NMR) spectra of the electrolyte solutions was investigated. The investigation revealed that the difference in the acidities of the Lewis acids, electron-donating abilities of the organophosphorus compounds, and solvated structures with a Lewis acid affect the electrochemical stability of self-extinguishing electrolyte solutions. Safety, specifically concerning flammability, is still an important concern with lithium-ion batteries, especially as they are now widely used in high-power and -energy applications such as electric-load leveling and electric-vehicle systems. Organophosphorus compounds, such as phosphate, 1-5 phosphonate, 6,7 and phosphazene, 8,9 are widely known as excellent flame retardants. These organophosphorus compounds are used either as co-solvents or additives in the conventional alkyl-carbonate-based electrolyte solution used in lithium-ion batteries. Trimethylphosphate (TMP) suppresses the flammability of electrolyte solutions because of its self-extinguishing property; that is, it can selectively scavenge the active hydrogen and oxygen radicals that contribute to the combustible chain reaction.1,10,11 However, TMP, which has a higher electron-donating ability than ethylene carbonate (EC), 12 tends to co-intercalate with Li + into the graphite negative electrode, resulting in continuous decomposition of the electrolyte solution and large, irreversible capacity loss during the initial chargedischarge of a lithium-ion battery. 1,[13][14][15][16]20 A solution to this co-intercalation problem was devised by Takeuchi et al. That is, the compatibility of TMP with graphite was improved by introducing a salt composed of stronger Lewis acids than Li + , such as Ca 2+ . 16 Moreover, the charge-discharge efficiency in the case of TMP in graphite was improved by adding calcium bis(trifluoromethanesulfonyl) amide (Ca(TFSA) 2 ) to an electrolyte containing TMP. This suppression of co-intercalation is derived from the solvation structure of Li + being altered by the stronger Lewis acid, namely, Ca 2+ . Fluorinated alkyl phosphates, such as tris(2,2,2-trifluoroethyl) pho...

show abstract

mentioning

confidence: 99%

Effect of Lewis Acids on Graphite-Electrode Properties in EC-Based Electrolyte Solutions with Organophosphorus Compounds

Tsubouchi

Suzuki

Nishimura

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Phosphazene elastomers having −OCH 2 (CF 2 ) n CF 3 side groups exhibit excellent oil resistance and T g as low as −60 °C without the addition of plasticizers. They are thus very suitable for special automotive and aerospace applications [172][173][174][175] and have also been suggested for biostable biomedical devices [176] Polphosphazenes with oligo-ethylene oxy side chains have also been considered for use in lithium-ion polymer batteries [177][178][179] and those with sulfonated aryloxy side groups as membranes for fuel cells [180]. Polyphosphazenes with ethylene oxy side groups can be crosslinked with γ-rays to give hydrogels, which have been investigated as controlled drug release agents [181][182][183][184][185].…”

Section: Ring-opening Polymerization Of Phosphazenesmentioning

confidence: 99%

Ring-Opening Polymerization—An Introductory Review

Nuyken

Pask²

2013

Polymers

365

265

View full text Add to dashboard Cite

We would like to dedicate this article to P. H. Plesch, a pioneer of cationic polymerization and a mentor and friend for many of those who are now at the forefront of this field of science. He passed away 5 March 2013 at the age of 95. We will miss him. Abstract: This short, introductory review covers the still rapidly growing and industrially important field of ring opening polymerization (ROP). The review is organized according to mechanism (radical ROP (RROP), cationic ROP (CROP), anionic ROP (AROP) and ring-opening metathesis polymerization (ROMP)) rather than monomer classes. Nevertheless, the different groups of cyclic monomers are considered (olefins, ethers, thioethers, amines, lactones, thiolactones, lactams, disulfides, anhydrides, carbonates, silicones, phosphazenes and phosphonites) and the mechanisms by which they can be polymerized involving a ring-opening polymerization. Literature up to 2012 has been considered but the citations selected refer to detailed reviews and key papers, describing not only the latest developments but also the evolution of the current state of the art.

show abstract

“…It was also proved that the polymer degradation still continue due to the comparatively stable P-O bond of phenoxy or ethoxy bulky side groups (Scheme 2) [61,62]. However, the water retention after degradation can be explained as the PMMA is hydrolytically stable and PPHOSs are hydrolytically sensitive.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Sustained release of hydrophilic drug from polyphosphazenes/poly(methyl methacrylate) based microspheres and their degradation study

Akram

Khalid

et al. 2016

Materials Science and Engineering: C

View full text Add to dashboard Cite

Methoxyethoxyethoxyphosphazenes as ionic conductive fire retardant additives for lithium battery systems

Cited by 76 publications

References 25 publications

Effect of Lewis Acids on Graphite-Electrode Properties in EC-Based Electrolyte Solutions with Organophosphorus Compounds

Effect of Lewis Acids on Graphite-Electrode Properties in EC-Based Electrolyte Solutions with Organophosphorus Compounds

Ring-Opening Polymerization—An Introductory Review

Sustained release of hydrophilic drug from polyphosphazenes/poly(methyl methacrylate) based microspheres and their degradation study

Contact Info

Product

Resources

About