Lithium cobaltate:a novel host material enables high-rate and stable lithium-sulfur batteries

摘要

Element sulfur is highly attractive due to their potentially low cost and environmental compatibility.However, polysulfides dissolution hinders the lithiumsulfur(Li-S) batteries toward commercialization. To overcome these issues, in this work, lithium cobaltate as a commercial material, for the first time, was devoted to engineering the electrode structure and composition to improve the performance. When incorporated with 80% sulfur powder, the synergetic effects of cobalt atoms and interlayer spaces effectively enable the production of Li-S batteries with a relatively high discharge capacity of 1420 mAh·g^(-1) at the low surface current density of 1 mA·cm^(-2) and stable capacity retention of 650 mAh·g^(-1) at high surface current density of 6 mA·cm^(-2). The introduction of lithium cobaltate is a viable approach for successfully developing practical Li-S batteries.