The Polymer Society of Korea

Abstract

Despite the enormous efforts to control the growth behavior of Li, achieving a dendrite-free Li deposition and high-energy-density have remained an inevitable challenge of Li metal batteries. Here, the conformal deposition of Li metal is reported on electroactive organic materials to achieve a high-energy-density and electrochemical longevity. To this end, Li2C8H4O4 (Li2TP), which can act as both the electrode material and Li host, is used as the model electroactive organic material. The Li2TP host exhibits reversible sequential lithiation/delithiation and Li deposition/stripping reactions. Consequently, a Li-free full cell constructed by the Li2TP host (without pre-charging) and a LiFePO4 cathode delivered a high areal capacity, exceptional rate performance , and superior cyclability (80% capacity retention after 100 cycles). This electroactive organic material-based Li host strategy can provide a new perspective for the development of practical Li metal batteries.