Electrochemical synthesis of a lithium-rich rock-salt-type oxide Li5W2O7 with reversible deintercalation properties

Valerie Pralong; Gopal Venkatesh; Sylvie Malo; Vincent Caignaert; Radu Baies; Bernard Raveau

doi:10.1021/ic402543e

Electrochemical synthesis of a lithium-rich rock-salt-type oxide Li5W2O7 with reversible deintercalation properties

Inorg Chem. 2014 Jan 6;53(1):522-7. doi: 10.1021/ic402543e. Epub 2013 Dec 20.

Authors

Valerie Pralong¹, Gopal Venkatesh, Sylvie Malo, Vincent Caignaert, Radu Baies, Bernard Raveau

Affiliation

¹ Laboratoire CRISMAT, CNRS ENSICAEN , 6 bd Maréchal Juin, 14050 Caen, France.

PMID: 24359470
DOI: 10.1021/ic402543e

Abstract

Starting from the ribbon structure Li2W2O7, the lithium-rich phase Li5W2O7 with an ordered rock-salt-type structure has been synthesized, through a topotactic irreversible reaction, using both electrochemistry and soft chemistry. In contrast to Li2W2O7, the lithium-rich oxide Li5W2O7 shows reversible deintercalation properties of two lithium molecules per formula unit: a stable reversible capacity of 110 mAh/g at 1.70 V is maintained after 10 cycles. The exploration of the lithium mobility in this system shows that Li2W2O7 is a cationic conductor with σ = 4.10(-4) S/cm at 400 °C and Ea = 0.5 eV.