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Impact of the flame retardant additive triphenyl phosphate (TPP) on the performance of graphite/LiFePO4 cells in high power applications

K. C. Hogstroem ; H. Lundgren ; Susanne Wilken (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; T. G. Zavalis ; M. Behm ; K. Edstrom ; Per Jacobsson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Patrik Johansson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; G. Lindberg
Journal of Power Sources (0378-7753). Vol. 256 (2014), p. 430-439.
[Artikel, refereegranskad vetenskaplig]

This study presents an extensive characterization of a standard Li-ion battery (LiB) electrolyte containing different concentrations of the flame retardant triphenyl phosphate (TPP) in the context of high power applications. Electrolyte characterization shows only a minor decrease in the electrolyte flammability for low TPP concentrations. The addition of TPP to the electrolyte leads to increased viscosity and decreased conductivity. The solvation of the lithium ion charge carriers seem to be directly affected by the TPP addition as evidenced by Raman spectroscopy and increased mass-transport resistivity. Graphite/LiFePO4 full cell tests show the energy efficiency to decrease with the addition of TPP. Specifically, diffusion resistivity is observed to be the main source of increased losses. Furthermore, TPP influences the interface chemistry on both the positive and the negative electrode. Higher concentrations of TPP lead to thicker interface layers on LiFePO4. Even though TPP is not electrochemically reduced on graphite, it does participate in SEI formation. TPP cannot be considered a suitable flame retardant for high power applications as there is only a minor impact of TPP on the flammability of the electrolyte for low concentrations of TPP, and a significant increase in polarization is observed for higher concentrations of TPP. (C) 2014 Elsevier B.V. All rights reserved.

Nyckelord: Triphenyl phosphate (TPP), Flame retardant additive, Graphite/LiFePO4 cell, Electrolyte characterization, Hybrid Pulse Power Characterization (HPPC), Electrode/electrolyte interface, LITHIUM-ION BATTERIES, SOLVENT-CONTAINING ELECTROLYTES, RAY, PHOTOELECTRON-SPECTROSCOPY, FLUORINATED ALKYL PHOSPHATES, ETHYLENE, CARBONATE, ELECTROCHEMICAL PERFORMANCE, NONFLAMMABLE ELECTROLYTES, NEGATIVE ELECTRODE, MIXED-SOLVENT, BASIS-SETS, LEAN AD, 1980, JOURNAL OF CHEMICAL PHYSICS, V72, P5639



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Denna post skapades 2014-05-05. Senast ändrad 2014-12-09.
CPL Pubid: 197550

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)

Ämnesområden

Energi
Materialvetenskap
Transport
Elektrokemi

Chalmers infrastruktur

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