Insights into the enhanced cycling stability of cobalt-free single-crystal layered oxide cathodes at elevated voltage

The single-crystal LiNi 0.6 Mn 0.4 O 2 (NM64, at 4.6 V) demonstrates better structural and thermal stability than LiNi 0.8 Mn 0.2 O 2 (NM82, at 4.5 V) with smaller c -axis lattice contraction.