Due to the large ionic radius and associated slow reaction kinetics of potassium ions, it is a major chal-lenge to find suitable anode materials for potassium-ion batteries. Herein, we design porous antimony -based nanofibres via a simple, low-cost and large scalable method to promote the electrochemical per-formance of potassium-ion batteries. Unlike those traditionally treated in inert atmospheres, using the different decomposition processes of polyacrylonitrile and polyvinylpyrrolidone in air, we obtain anti-mony trioxide embedded in porous carbon nanofibres (Sb2O3@PCN). The porous structur...
