10.1021/acs.chemmater.8b03525.s001
Damian Goonetilleke
Damian
Goonetilleke
Neeraj Sharma
Neeraj
Sharma
Wei Kong Pang
Wei Kong
Pang
Vanessa K. Peterson
Vanessa K.
Peterson
Remi Petibon
Remi
Petibon
Jing Li
Jing
Li
J. R. Dahn
J. R.
Dahn
Structural Evolution and High-Voltage Structural Stability
of Li(Ni<sub><i>x</i></sub>Mn<sub><i>y</i></sub>Co<sub><i>z</i></sub>)O<sub>2</sub> Electrodes
American Chemical Society
2018
stability
discharge cycling
Li-ion pouch cells
Co content
NMC compositions
Structural Evolution
Mn
electrode compositions
High-Voltage Structural Stability
O 2 Electrodes
energy density
electrochemical characterization
electrode materials
Ni content
electrochemical behavior
energy density LIBs
transition-metal atoms
lithium-ion batteries
operando neutron diffraction
2018-12-17 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Structural_Evolution_and_High-Voltage_Structural_Stability_of_Li_Ni_sub_i_x_i_sub_Mn_sub_i_y_i_sub_Co_sub_i_z_i_sub_O_sub_2_sub_Electrodes/7562129
Positive
electrode materials remain a limiting factor for the energy
density of lithium-ion batteries (LIBs). Improving the structural
stability of these materials over a wider potential window presents
an opportune path to higher energy density LIBs. Herein, operando
neutron diffraction is used to elucidate the relationship between
the structural evolution and electrochemical behavior for a series
of Li-ion pouch cells containing Li(Ni<sub><i>x</i></sub>Mn<sub><i>y</i></sub>Co<sub><i>z</i></sub>)O<sub>2</sub> (<i>x</i> + <i>y</i> + <i>z</i> = 1) electrode chemistries. The structural stability of these electrodes
during charge and discharge cycling across a wide potential window
is found to be influenced by the ratio of transition-metal atoms in
the material. Of the electrodes investigated in this study, the Li(Ni<sub>0.4</sub>Mn<sub>0.4</sub>Co<sub>0.2</sub>)O<sub>2</sub> composition
exhibits the smallest magnitude of structural expansion and contraction
during cycling while also providing favorable structural stability
at high voltage. Greater structural change was observed in electrodes
with a higher Ni content, while decreasing inversely to the Ni and
Co content in the positive electrode. The combination of structural
and electrochemical characterization of a wide range of NMC compositions
provides useful insight for the design and application of ideal electrode
compositions for long-term cycling and structural stability during
storage at the charged state.