Bi₂S₃/Ketjen Black as a Highly Efficient Bifunctional Catalyst for Long‐Cycle Lithium‐Oxygen Batteries

Abstract

A catalyst that possesses an efficient bifunctional catalytic activity is vital to achieve long‐life lithium‐oxygen (Li−O2) batteries. Herein, a bismuth sulfide/Ketjen black (Bi2S3/KB) hybrid is synthesized through a one‐step hydrothermal method and used as a bifunctional catalyst in Li−O2 batteries. The results demonstrate that Li−O2 batteries with the Bi2S3/KB hybrid exhibit both a higher capacity and a lower overpotential than those with the bare bismuth sulfide (Bi2S3) and KB catalysts. A Li−O2 battery with the Bi2S3/KB catalyst shows an excellent cycle life of 391 cycles at 1000 mA h g−1, which is one of the best results for batteries with sulfide catalysts. The excellent electrochemical performance of the batteries originates from the synergistic catalytic effect between Bi2S3 and KB. It is found that the Li2O2 is deposited on Bi2S3 nanorods prior to on KB upon discharge, which can defer the deactivation of the cathode and inhibit the side reactions.

Glu-Co-Assisted Iron-Based Metal–Organic Framework-Derived FeCo/N Co-Doped Carbon Material as Efficient Bifunctional Oxygen Electrocatalysts for Zn–Air Batteries

“…Moreover, the addition of a conductive agent may also play an important role in yield improvement. KB is a conductive additive with high electrical conductivity and a high specific surface area [43][44][45] that can be used in the synthesis of MOF-derived carbon materials as a conductive agent and a carbon source to improve their performance and product yield. NH 2 -MIL-101 is an ideal precursor with a high content of nitrogen, highly dispersed iron, and a high SSA [46,47].…”