This study explores the use of magnesium phthalocyanine (MgPc) anchored on fluorinated carbon nanotubes (MgPc@FCNT) to enhance the redox kinetics in lithium-sulfur (Li-S) batteries. The axial displacement of Mg sites in MgPc@FCNT leads to electronic spin polarization, which increases the adsorption energy of lithium polysulfides (LiPSs) intermediates and facilitates electron tunneling. This results in a significant reduction in capacity decay rate and ultra-low capacity decay of 0.029% per cycle over 1000 cycles, even at a high sulfur loading of 4.5 mg cm⁻². The superior performance of MgPc@FCNT is attributed to its optimized spin density and catalytic activity, making it a promising material for high-performance Li-S batteries.This study explores the use of magnesium phthalocyanine (MgPc) anchored on fluorinated carbon nanotubes (MgPc@FCNT) to enhance the redox kinetics in lithium-sulfur (Li-S) batteries. The axial displacement of Mg sites in MgPc@FCNT leads to electronic spin polarization, which increases the adsorption energy of lithium polysulfides (LiPSs) intermediates and facilitates electron tunneling. This results in a significant reduction in capacity decay rate and ultra-low capacity decay of 0.029% per cycle over 1000 cycles, even at a high sulfur loading of 4.5 mg cm⁻². The superior performance of MgPc@FCNT is attributed to its optimized spin density and catalytic activity, making it a promising material for high-performance Li-S batteries.