What question did this study set out to answer?

This research aims to improve the performance and safety of lithium-sulfur batteries through a bimetallic catalyst.

June 2, 2026Advanced Functional Materials0 citations

Bi‐Co Based Bimetallic Catalysts for Synergistic Construction of Advanced Lithium‐Sulfur Batteries With High‐Safety and Wide Temperature Range Stability

XDXinxin DongBeijing University of Chemical Technology GLGuoqing LiuBeijing University of Chemical Technology HYHao YuBeijing University of Chemical Technology

Key Points

This research aims to improve the performance and safety of lithium-sulfur batteries through a bimetallic catalyst.
Developed a bimetallic catalyst Bi-CoP@G with a core-shell structure.
Evaluated the catalyst's effectiveness in lithium polysulfide adsorption and redox kinetics.
Tested performance over 500 and 1000 cycles at various temperatures.
Achieved 82.9% capacity retention after 500 cycles at 1 C and a decay rate of 0.02% over 1000 cycles at 2 C.
Demonstrated stable cycling at temperatures from -20 to 50°C with a capacity of 124 mA h.
Enhanced fire safety through gas-phase free radical scavenging and promoted carbonization during combustion.

Abstract

ABSTRACT The limited number of active sites and rapid saturation of single‐metal catalysts hinder the sustained adsorption and efficient conversion of lithium polysulfides (LiPSs) in lithium‐sulfur batteries (LSBs). Here, we report a bimetallic catalyst (Bi‐CoP@G) with a core‐shell adsorptive‐conductive‐catalytic network to address the above challenges. In this structure, Bi sites strongly adsorb LiPSs via Bi‐S bonds, effectively immobilizing LiPSs and suppressing the shuttle effect. Complementarily, Co sites accelerate the redox kinetics of solid Li 2 S nucleation and dissolution. Interfacial charge redistribution and orbital coupling between the metals enhance electron transfer, establishing a synergistic “adsorption‐catalysis” cycle. Using Bi‐CoP@G/PP separators, the LSBs exhibit 82.9% capacity retention after 500 cycles at 1 C and an ultra‐low decay rate of 0.02% per cycle over 1000 cycles at 2 C. Moreover, the LSBs demonstrate stable cycling at a wide temperature range (‐20 to 50°C) and at the pouch‐LSB scale with a capacity of 124 mA h. Additionally, Bi‐CoP@G significantly enhances the fire safety of LBSs by simultaneously scavenging gas‐phase free radicals and promoting condensed‐phase carbonization during combustion. In summary, this work demonstrates a strategy for highly active bimetallic synergistic catalysts, offering a novel approach for the large‐scale production of advanced safe, and stable LSBs.

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