TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Horstmann, Birger
A1  - Gallant, Betar
A1  - Mitchell, Robert
A1  - Bessler, Wolfgang G.
A1  - Shao-Horn, Yang
A1  - Bazant, Martin Z.
T1  - Rate-Dependent Morphology of Li2O2 Growth in Li–O2 Batteries
JF  - The Journal of Physical Chemistry Letters
N2  - Compact solid discharge products enable energy storage devices with high gravimetric and volumetric energy densities, but solid deposits on active surfaces can disturb charge transport and induce mechanical stress. In this Letter, we develop a nanoscale continuum model for the growth of Li2O2 crystals in lithium–oxygen batteries with organic electrolytes, based on a theory of electrochemical nonequilibrium thermodynamics originally applied to Li-ion batteries. As in the case of lithium insertion in phase-separating LiFePO4 nanoparticles, the theory predicts a transition from complex to uniform morphologies of Li2O2 with increasing current. Discrete particle growth at low discharge rates becomes suppressed at high rates, resulting in a film of electronically insulating Li2O2 that limits cell performance. We predict that the transition between these surface growth modes occurs at current densities close to the exchange current density of the cathode reaction, consistent with experimental observations.
KW  - Lithiumbatterie
KW  - Lithium
KW  - Morphologie
Y1  - 2013
SN  - 1948-7185
SS  - 1948-7185
U6  - https://doi.org/10.1021/jz401973c
DO  - https://doi.org/10.1021/jz401973c
PM  - 26296168
AX  - 1307.6621
VL  - 4
IS  - 24
SP  - 4217
EP  - 4222
ER  -