Single‐atomic Co‐B2N2 sites anchored on carbon nanotube arrays promote lithium polysulfide conversion in lithium–sulfur batteries
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Abstract
Abstract Due to low cost, high capacity, and high energy density, lithium–sulfur (Li–S) batteries have attracted much attention; however, their cycling performance was largely limited by the poor redox kinetics and low sulfur utilization. Herein, predicted by density functional theory calculations, single‐atomic Co‐B 2 N 2 site‐imbedded boron and nitrogen co‐doped carbon nanotubes (SA‐Co/BNC) were designed to accomplish high sulfur loading, fast kinetic, and long service period Li–S batteries. Experiments proved that Co‐B 2 N 2 atomic sites can effectively catalyze lithium polysulfide conversion. Therefore, the electrodes delivered a specific capacity of 1106 mAh g −1 at 0.2 C after 100 cycles and exhibited an outstanding cycle performance over 1000 cycles at 1 C with a decay rate of 0.032% per cycle. Our study offers a new strategy to couple the combined effect of nanocarriers and single‐atomic catalysts in novel coordination environments for high‐performance Li–S batteries.
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