TY - JOUR
T1 - Li/Fe substitution in Li-rich Ni, Co, Mn oxides for enhanced electrochemical performance as cathode materials
AU - Billaud, Juliette
AU - Sheptyakov, Denis
AU - Sallard, Sébastien
AU - Leanza, Daniela
AU - Talianker, Michael
AU - Grinblat, Judith
AU - Sclar, Hadar
AU - Aurbach, Doron
AU - Novák, Petr
AU - Villevieille, Claire
N1 - Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Li-rich nickel cobalt manganese (NCM) oxides are among the most promising cathode materials for lithium-ion batteries owing to their high specific charges and operating voltages. However, their crystal structures are unstable upon prolonged cycling, leading to a collapse of their electrochemical performance. In this study, we investigated Fe doping of Li-rich NCM materials and explored various Li/Fe ratios. Compared with the reference Li-rich NCM material, the Li1.16(Ni0.18Co0.10Mn0.52Fe0.02)O2 composition exhibited a higher specific charge, potential drop mitigation at fast cycling rates, and an enhanced rate capability. At a rate of 4C, this composition exhibited a specific charge of 150 mA h g-1, which was as much as 50% higher than that of the reference (100 mA h g-1). Neutron and X-ray diffraction data for compounds with different Fe doping concentrations indicated that the crystallographic structure was preserved with up to 2 mol% Fe without the formation of separate impurity phases. Furthermore, we found that the crystal structure of this Fe-doped material was less susceptible to the effects of prolonged cycling than the reference compound. Complementary investigations with X-ray photoelectron spectroscopy revealed that Fe was electrochemically active in the structure, which explains the beneficial effects observed with Fe doping of Li-rich NCM materials, such as an increased specific charge and more stable cycling.
AB - Li-rich nickel cobalt manganese (NCM) oxides are among the most promising cathode materials for lithium-ion batteries owing to their high specific charges and operating voltages. However, their crystal structures are unstable upon prolonged cycling, leading to a collapse of their electrochemical performance. In this study, we investigated Fe doping of Li-rich NCM materials and explored various Li/Fe ratios. Compared with the reference Li-rich NCM material, the Li1.16(Ni0.18Co0.10Mn0.52Fe0.02)O2 composition exhibited a higher specific charge, potential drop mitigation at fast cycling rates, and an enhanced rate capability. At a rate of 4C, this composition exhibited a specific charge of 150 mA h g-1, which was as much as 50% higher than that of the reference (100 mA h g-1). Neutron and X-ray diffraction data for compounds with different Fe doping concentrations indicated that the crystallographic structure was preserved with up to 2 mol% Fe without the formation of separate impurity phases. Furthermore, we found that the crystal structure of this Fe-doped material was less susceptible to the effects of prolonged cycling than the reference compound. Complementary investigations with X-ray photoelectron spectroscopy revealed that Fe was electrochemically active in the structure, which explains the beneficial effects observed with Fe doping of Li-rich NCM materials, such as an increased specific charge and more stable cycling.
UR - http://www.scopus.com/inward/record.url?scp=85068139781&partnerID=8YFLogxK
U2 - 10.1039/c9ta00399a
DO - 10.1039/c9ta00399a
M3 - Article
AN - SCOPUS:85068139781
SN - 2050-7488
VL - 7
SP - 15215
EP - 15224
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 25
ER -
