Improved electrochemical performance of LiNi0.5Mn0.3Co0.2O2 electrodes coated by atomic-layer-deposited Ta2O5

Abstract

Surface coating of LiNi[Formula: see text]Mn[Formula: see text]Co[Formula: see text]O2 (NMC532) is an effective approach to improve the capacity retention and energy density through increasing cutoff operation voltage. In this work, NMC532 electrodes are directly coated with Ta2O5 via atomic layer deposition (ALD). The 5 cycles ALD-Ta2O5-coated electrodes have the significantly enhanced capacity cyclability. The high-quality amorphous ALD-Ta2O5 layer retards the interfacial reaction between NMC532 and electrolyte, and prevents the dissolution of the active materials, improving the phase stability of the NMC532 materials.