Redox-Active Tungsten Mono-Oxo Bis(dithiolene) Complex: A Fast-Rechargeable Anode for High-Capacity Lithium-Ion Batteries

Abstract

The increase in electric vehicle popularity has heightened the need for high-energy lithium-ion batteries (LIBs). LIB performance has been steadily improved, but next-generation energy storage systems have yet to be developed. However, redox-active organometallic complexes have unique electrical properties with the potential for integration into LIB systems as promising electrode materials. Herein, the Li-ion storage capability of a redox-active W-oxo bis(dithiolene) complex is explored as a novel anode material for LIBs. Based on these redox properties, the W-oxo bis(dithiolene) complex anode demonstrated electrochemical reversibility in lithiation-delithiation processes and outstanding rate performance (698 mAh g-1 after 1000 cycles at 10 A g-1). Ex situ X-ray photoelectron spectroscopy analysis, computational simulations, and further electrochemical investigations were performed to investigate the electrochemical Li-ion storage mechanism of the W-oxo bis(dithiolene) complex anode. This work presents a new strategy for high-capacity LIBs by incorporating a redox-active W-oxo bis(dithiolene) complex into an unprecedented anode material.