Affiliation:
1. School of Energy and Chemical Engineering, UNIST Ulsan 44919 Korea
2. Advanced Batteries Research Center KETI Seongnam, Gyeonggi 13509 Korea
Abstract
AbstractHigh‐capacity Li‐rich layered oxides using oxygen redox as well as transition metal redox suffer from its structural instability due to lattice oxygen escaped from its structure during oxygen redox and the following electrolyte decomposition by the reactive oxygen species. Herein, we rescued a Li‐rich layered oxide based on 4d transition metal by employing an organic superoxide dismutase mimics as a homogeneous electrolyte additive. Guaiacol scavenged superoxide radicals via dismutation or disproportionation to convert two superoxide molecules to peroxide and dioxygen after absorbing lithium superoxide on its partially negative oxygen of methoxy and hydroxyl groups. Additionally, guaiacol was decomposed to form a thin and stable cathode‐electrolyte interphase (CEI) layer, endowing the cathode with the interfacial stability.
Funder
National Research Foundation of Korea