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Exploring the rate dependence of phase evolution in P2-type Na2/3Mn0.8Fe0.1Ti0.1O2

DOI: 10.1039/C9TA01366K DOI Help

Authors: Damian Goonetilleke (UNSW Sydney) , Sunny Wang (UNSW Sydney) , Elena Gonzalo (CICenergigune) , Montserrat Galcerán (CICenergigune) , Damien Saurel (CICenergigune) , Sarah J. Day (Diamond Light Source) , Francois Fauth (CELLS – ALBA Synchrotron) , Teófilo Rojo (CICenergigune; Universidad del País Vasco UPV/EHU) , Neeraj Sharma (UNSW Sydney)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A , VOL 16

State: Published (Approved)
Published: April 2019
Diamond Proposal Number(s): 14512

Abstract: P2-type Na2/3Mn0.8Fe0.1Ti0.1O2, a promising high-performance electrode material for use in ambient temperature sodium-ion batteries, is examined using operando and long-term in situ synchrotron X-ray diffraction studies to reveal the structural evolution during battery function. Variable current cycling at current rates as high as 526 mA g−1 (4C) over a wide voltage window (1.5 V to 4.2 V) reveals that the structural transitions of the positive electrode material at higher currents may be suppressed by kinetic limitations which reduce the magnitude of change of the sodium content in the electrode. At low currents, when maximum desodiation is achieved, a collapse in the c lattice parameter is observed as the cell reaches the charged state, however this behaviour is not observed during cycling at higher currents.

Diamond Keywords: Batteries; Sodium-ion

Subject Areas: Chemistry, Energy, Materials

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ALBA

Added On: 07/05/2019 11:49

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags: