Fig. 4: Spatial-resolved electrochemical evolution after the 1st and 201st cycle.
From: Surface regulation enables high stability of single-crystal lithium-ion cathodes at high voltage
a Operando 2D chemical phase mappings at the Ni K-edge of NCM particles during the first and 201st cycles. Scale bars 2 μm. 1st (I, pristine; III, 4.7 V; V, 3.6 V), and 201st cycle (II, pristine; IV, 4.7 V; VI, 3.6 V), b Quantification of the selected positions in 2D TXM-XANES phase mappings (Red represents discharge state, green represents charge state).
