Lignin Derived Free‐Standing Sulfur Host Functionalized with MoS₂ for Li–S Batteries

Lignin, a widely available natural polymer and sustainable biomass precursor, contains over 60 wt% carbon. However, its potential for producing high‐value carbon‐based materials and its application in energy‐related areas remain largely underutilized. In this work, a green and scalable strategy is reported for constructing a free‐standing carbon nanofiber (CNF) film by electrospinning using lignin as the carbon precursor, with uniformly embedded MoS 2 nanoparticles to endow integrated catalytic function. The resulting MoS 2 /CNFs film exhibits excellent structural integrity, enabling its direct use as a binder‐free and current‐collector‐free cathode framework for lithium–sulfur (Li−S) batteries. Furthermore, the embedded catalytic components can chemically adsorb lithium polysulfides and enhance sulfur redox reaction kinetics. As a result, Li−S cells with MoS 2 /CNFs‐based cathode demonstrate excellent cycling stability, maintaining a capacity of 609.3 mAh g −1 after 200 cycles at 1C. This work highlights a promising approach for transforming low‐cost lignin into multifunctional electrode materials, offering both structural robustness and catalytic activity for next‐generation Li–S batteries.