High-Rate Performance and Ultralong Cycle Life Enabled by Hybrid Organic–Inorganic Vanadyl Ethylene Glycolate for Lithium-Ion Batteries

Transition metal oxides (TMOs) possess high theoretical capacity and serve as promising anode candidates for lithium-ion batteries. However, the intrinsic low conductivity handicaps the application of TMOs. Molecular modification by coupling TMOs structure with Li-ion conductive polymer ligands can facilitate the kinetics of electrochemical lithiation/delithiation process. Herein, a proof-of-concept investigation on the Li-ion storage capability by vanadyl ethylene glycolate (VEG) is achieved with the improvement of Li-ion diffusion kinetics by modifiying the vanadium oxide with organic ligands. VEG demonstrates unprecedented advantage for fast rate capability, stable cycleability, and high capacity at both room temperarture (25 °C) and elevated temperature (60 °C).