1 research outputs found
A Kinetic Indicator of Ultrafast Nickel-Rich Layered Oxide Cathodes
Elucidating high-rate cycling-induced nonequilibrium
electrode
reactions is crucial for developing extreme fast charging (XFC) batteries.
Herein, we unveiled the distinct rate capabilities of a series of
Ni-rich layered oxide (NRLO) cathodes by quantitatively establishing
their dynamic structure–kinetics relationships. Contrary to
conventional views, we discovered electrode kinetic properties obtained ex-situ near equilibrium states failed to assess the effective
rate capability of NRLOs at ultrafast C rates. Further, the kinetic
phase heterogeneity, characterized by the dynamic separations in in-situ X-ray diffraction patterns and deviations in NRLO c-axis lattice parameters, exclusively correlated with the
capacity reduction under XFC and became an effective indicator of
the NRLO rate capability. Enhancing the cycling temperature boosted
the rate capability of studied NRLOs by ∼10%, which was further
verified to mitigate the kinetic phase heterogeneity during XFC. Overall,
this study lays the groundwork for tuning the kinetic phase heterogeneity
of electrodes to develop ultrafast batteries