Front Cover: Method development for the investigation of Mn2+/3+, Cu2+, Co2+, and Ni2+ with capillary electrophoresis hyphenated to inductively coupled plasma–mass spectrometry

DOI: 10.1002/elps.202200139 The cover image shows the dissolution of various transition metal (TM) ions from the cathode (left side) of a lithium ion battery (LIB) into the electrolyte and the migration to the anode (right side). In the cathode, the TMs enable redox reactions and stabilize the structure during cycling, allowing a LIB to operate. However, when the TM ions reach the negative electrode, they exhibit their destructive behavior and affect the electrolyte‐protective interphase layer, resulting in shorter battery life. With the newly developed CE‐ICP‐MS (electropherogram), it is possible to quantify these dissolved transition metals, especially Mn2+ and Mn3+.